| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| December | 8 | 1941 | AWAJISAN MARU | Passenger-Cargo | 9,794 | 6-03N, 102-16E | Australia | Aircraft | Sunk |
| 10 | TAKAO MARU |
Passenger-Cargo | 4,281 | 17-29N, 120-26E | United States | Army Aircraft U.S. Sabotage | Sunk | ||
| 12 | TORO MARU | Cargo | 1,939 | 6-08N, 102-16E | Netherlands | Submarine | Sunk | ||
| 13 | NIKKOKU MARU | Cargo | 2,728 | 13-00N, 110-00E | Japan | Marine Casualty | Sunk | ||
| 14 | MIHARU MARU | Cargo | 3,357 | 41-55N, 143-15E | Japan | Marine Casualty | Sunk | ||
| 14 | ZUIKO MARU | Converted Gunboat | 2,577 | 48-05N, 153-43E | Japan | Marine Casualty | Sunk | ||
| 16 | ATSUTASAN MARU | Cargo | 3,662 | 18-06N, 109-44E | United States | Submarine | Sunk | ||
| 22 | HAYO MARU | Cargo | 5,445 | 16-37N, 120-17E | United States | Submarine | Sunk | ||
| 23 | HAYATAKA MARU | Cargo | 856 | 17-35N, 120-12E | United States | Submarine | Sunk | ||
| 23 | KATORI MARU | Cargo | 9,849 | 2-30N, 110-00E | Netherlands | Submarine | Sunk | ||
| 23 | HIE MARU | Passenger-Cargo | 4,943 | 2-30N, 110-00E | Netherlands | Submarine | Sunk | ||
| 26 | UNYO MARU NO 2 | Converted Salvage Vessel | 2,827 | 1-34N, 110-213 | Netherlands | Aircraft | Sunk | ||
| 12 Vessels | 57,758 | ||||||||
| January | 1 | 1942 | TEIUN MARU | Cargo | 1,615 | 16-05N, 120-20E | Japan | Mine | Sunk |
| 3 | MEIKO MARU | Passenger-Cargo | 4,383 | 18-18N, 109-42E | Japan | Marine Casualty | Sunk | ||
| 7 | UNKAI MARU NO 1 | Cargo | 2,225 | 34-27N, 138-59E | United States | Submarine | Sunk | ||
| 9 | TEIAN MARU | Cargo | 5,387 | 35-00N, 140-36E | United States | Submarine | Sunk | ||
| 10 | AKITA MARU | Passenger-Cargo | 3,317 | 7-40N, 102-50E | Netherlands | Submarine | Sunk | ||
| 10 | KANKO MARU | Converted Gunboat | 2,929 | 6-12N, 125-55E | United States | Submarine | Sunk | ||
| 10 | HARBIN MARU | Transport | 5,167 | 17-40N, 109-20E | United States | Submarine | Sunk | ||
| 16 | TAISHU MARU | Cargo | 1,220 | 42-00N, 139-00E | Japan | Marine Casualty | Sunk | ||
| 17 | FUKUSEI MARU | Passenger-Cargo | 5,822 | 31-00N, 122-00E | Japan | Marine Casualty | Sunk | ||
| 17 | SHINZUI MARU | Cargo | 2,964 | 25-03N, 121-04E | Japan | Marine Casualty | Sunk | ||
| 13 | EIZAN MARU | Cargo | 4,702 | 33-30N, 135-00E | United States | Submarine | Sunk | ||
| 24 | KURETAKE MARU | Cargo | 5,175 | 00-10N, 118-00E | United States | Surface Craft | Sunk | ||
| 24 | TSURUGA MARU | Passenger-Cargo | 6,988 | 00-10N, 118-00E | United States | Surface Craft | Sunk | ||
| 24 | TATSUKAMI MARU | Passenger-Cargo | 7,064 | 00-10N, 118-00E | United States | Surface Craft | Sunk | ||
| 24 | SUMANOURA MARU | Passenger-Cargo | 3,519 | 00-10N, 118-00E | United States | Surface Craft | Sunk | ||
| 24 | NANA MARU | Passenger-Cargo | 6,764 | 00-10N, 118-00E | Netherlands | Aircraft | Sunk | ||
| 24 | MYOKEN MARU | Cargo | 4,124 | 1-22N, 125-05E | United States | Submarine | Sunk | ||
| 17 Vessels | 73,865 | ||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| February | 1 | 1942 | BORDEAUX MARU | Passenger-Cargo | 6,566 | 9-28N, 170-15E | United States | Surface Craft | Sunk |
| 1 | TOYOTSU MARU | Converted Gunboat | 2,930 | 9-28N, 170-15E | United States | Surface Craft | Sunk | ||
| 2 | TAMAGAWA MARU | Passenger-Cargo | 6,441 | 17-16N, 119-48E | United States | Submarine | Sunk | ||
| 9 | KURAMA | Passenger-Cargo | 6,783 | East China Sea | Unknown | Unknown | Sunk | ||
| 10 | CHUWA MARU | Cargo | 2,719 | 25-30N, 122-38E | United States | Submarine | Sunk | ||
| 14 | INABASAN MARU | Cargo | 989 | 1-25S, 105-00E | United States Great Britain Netherlands |
Army Aircraft Aircraft Aircraft |
Sunk | ||
| 17 | SHINYO MARU NO 5 | Cargo | 1,498 | 32-14N 127-14E | United States | Submarine | Sunk | ||
| 21 | SHOKYU MARU | Cargo | 4,434 | 32-10N, 126-28E | United States | Submarine | Sunk | ||
| 25 | FUJISHIMA MARU | Cargo | 4,376 | 35-09N, 140-18E | Japan | Marine Casualty | Sunk | ||
| 9 Vessels | 37,291 | ||||||||
| March | 1 | 1942 | SAKURA MARU | Passenger-Cargo | 7,170 | 5-56S, 106-12E | United States United States Australia Netherlands Netherlands |
Army Aircraft Surface Craft Aircraft Aircraft Surface Craft |
Sunk |
| 1 | HORAI MARU | Passenger-Cargo | 9,192 | 5-56S, 106-12E | United States United States Australian Netherlands Netherlands |
Army Aircraft Surface Craft Aircraft Aircraft Surface Craft |
Sunk | ||
| 1 | KAIJO MARU NO 2 | Tanker | 8,636 | 4-52N, 151-20E | United States | Submarine | Sunk | ||
| 2 | KAMOGAWA MARU | Aircraft Ferry | 6,440 | 8-06S, 115-57E | United States | Submarine | Sunk | ||
| 4 | MORIOKA MARU | Cargo | 4,469 | 32-55N, 129-26E | Japan | Mine* | Sunk | ||
| 4 | TAKI MARU | Cargo | 1,244 | 28-37N, 129-10E | United States | Submarine | Sunk | ||
| 4 | ERIMO | Tanker | 6,500 | 4-19S, 108-25E | United States | Submarine | Sunk | ||
| 4 | UNKNOWN MARU | Cargo | 4,000e | 32-33N, 133-26E | United States | Submarine | Sunk | ||
| 10 | YOKOHAMA MARU | Cargo | 6,143 | 7-01S, 147-07E | United States | Army Aircraft Navy Carrier-Based Aircraft | Sunk | ||
| 10 | KONGO MARU | Converted Light Cruiser | 8,624 | 6-49S, 147-02E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 10 | TENYO MARU | Converted Minesweeper | 6,843 | 6-49S, 147-02E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 10 | KOSEI MARU | Passenger-Cargo | 6,667 | 16-05N, 120-20E | Japan | Mine | Sunk | ||
| 11 | FUKUSHU MARU | Cargo | 1,454 | 30-53N, 126-20E | United States | Submarine | Sunk | ||
| 13 | CHICHIBU MARU | Cargo | 1,520 | 33-53N, 139-29E | United States | Submarine | Sunk | ||
| 17 | YUBARI MARU | Cargo | 4,109 | 3-05S, 114-21E | Netherlands | Aircraft* | Sunk | ||
| * Probable Agent | |||||||||
| Date | Name of Vessel | Typeof Vessel | Gross Tonnage |
Location | Flag of Agent |
Typeof Agent | Assessment | ||
| March | 17 | 1942 | ISHIKARI MARU | Cargo | 3,291 | 27-05N, 142-05E | United States | Submarine | Sunk |
| 26 | UNKNOWN MARU | Cargo | 4,000e | 32-31N, 127-10E | United States | Submarine | Sunk | ||
| 27 | KITANO MARU | Passenger-Cargo | 7,951 | 16-10N, 120-24E | Japan | Mine* | Sunk | ||
| 27 | UNKNOWN MARU | Passenger-Cargo | 4,000e | 33-53N, 127-33E | United States | Submarine | Sunk | ||
| 30 | CHOKO MARU | Cargo | 842 | 5-39S, 119-00E | United States | Submarine | Sunk | ||
| 20 Vessels | 103,095 | ||||||||
| April | 1 | 1942 | YAE MARU | Cargo | 6,731 | 5-42N, 98-57E | Great Britain |
Submarine | Sunk |
| 1 | SHUNSEI MARU | Cargo | 4,939 | 5-42N, 93-57E | Great Britain |
Submarine | Sunk | ||
| 10 | SADO MARU | Cargo | 3,039 | 34-52N, 139-15E | United States | Submarine | Sunk | ||
| 11 | TAIJUN MARU | Cargo | 1,274 | 6-49S, 147-02E | United States | Army Aircraft | Sunk | ||
| 13 | RYUJIN MARU | Cargo | 6,243 | 31-51N, 132-50E | United States | Submarine | Sunk | ||
| 17 | UNKNOWN MARU | Cargo | 4,000e | 10-53N, 121-35E | United States | Submarine | Sunk | ||
| 18 | KOMAKI MARU | Transport | 8,525 | 4-12S, 152-10E | United States | Army Aircraft | Sunk | ||
| 23 | UNKNOWN MARU | Trawler | 1,000e | 28-22N, 153-18E | United States | Submarine | Probably sunk | ||
| 25 | TOBA MARU | Cargo | 6,995 | 17-01N, 120-15E | United States | Submarine | Probably sunk | ||
| 9 Vessels | 42,796 | ||||||||
| May | 1 | 1942 | CALCUTTA MARU | Passenger-Cargo | 5,339 | 28-07N, 123-45E | United States | Submarine | Sunk |
| 2 | UZAN MARU | Cargo | 5,014 | 33-26N, 135-52E | United States | Submarine | Sunk | ||
| 4 | KINJOSAN MARU | Cargo | 3,262 | 8-44N, 150-56E | United States | Submarine | Sunk | ||
| 4 | KONGOSAN MARU | Converted Gunboat | 2,119 | 33-32N, 136-05E | United States | Submarine | Sunk | ||
| 6 | KANAN MARU | Cargo | 2,567 | 12-05N, 109-35E | United States | Submarine | Sunk | ||
| 6 | TAIEI MARU | Cargo | 2,209 | 28-42N, 123-50E | United States | Submarine | Sunk | ||
| 6 | TAIGEN MARU | Passenger-Cargo | 5,660 | 28-19N, 123-33E | United States | Submarine | Sunk | ||
| 8 | BUJUN MARU | Cargo | 4,804 | 12-00N, 111-10E | United States | Submarine | Sunk | ||
| 8 | TAIYO MARU | Transport | 14,457 | 30-40N, 127-54E | United States | Submarine | Sunk | ||
| 9 | UNKNOWN MARU | Cargo | 4,000e | 33-48N, 136-03E | United States | Submarine | Probably sunk | ||
| 10 | ORIDONO MARU | Cargo | 5,278 | 7-00S, 112-40E | Japan | Mine* | Sunk | ||
| 12 | SHOEI MARU | Converted Salvage Vessel | 5,644 | 4-51S, 152-54E | United States | Submarine | Sunk | ||
| 13 | SHONAN MARU | Cargo | 5,264 | 34-39N, 139-10E | United States | Submarine | Sunk | ||
| 13 | NAGASAKI MARU | Transport | 5,268 | 33-00N, 129-40E | Japan | Mine | Sunk | ||
| 15 | TOYOHARA MARU | Cargo | 805 | 33-34N, 125-09E | United States | Submarine | Sunk | ||
| 17 | UNKNOWN MARU | Cargo | 4,000e | 33-23N, 135-33E | United States | Submarine | Sunk | ||
| 17 | TAZAN MARU | Passenger-Cargo | 5,478 | 6-22N, 103-36E | United States | Submarine | Sunk | ||
| 25 | KITAKATA MARU | Cargo | 2,380 | 34-53N, 140-04E | United States | Submarine | Sunk | ||
| 25 | TOKYO MARU | Tanker | 902 | 27-03N, 127-03E | United States | Submarine | Sunk | ||
| 25 | SHOKA MARU | Cargo | 4,467 | 4-07N, 143-32E | United States | Submarine | Sunk | ||
| 28 | GANGES MARU | Passenger-Cargo | 4,382 | 9-00N, 111-00E | United States | Submarine | Sunk | ||
| * Probable Agent | |||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| May | 28 | 1942 | TATSUFUKU MARU | Cargo | 1,946 | 7-27N, 116-17E | United States | Submarine | Sunk |
| 29 | UNKNOWN MARU | Cargo | 1,900e | 7-33N, 116-18E | United States | Submarine | Sunk | ||
| 30 | ATSUTA MARU | Transport | 7,983 | 26-07N, 129-06E | United States | Submarine | Sunk | ||
| 24 Vessels | 105,123 | ||||||||
| June | 1 | 1942 | KOFUKU MARU | Passenger-Cargo | 5,822 | 16-16N, 96-18E | United States | Army Aircraft | Sunk |
| 4 | TOYOHASHI MARU | Passenger-Cargo | 7,031 | 7-30N, 93-10E | Great Britain |
Submarine | Sunk | ||
| 12 | BURMA MARU | Cargo | 4,584 | 10-08N, 102-34E | United States | Submarine | Sunk | ||
| 14 | TAIZAN MARU | Cargo | 3,930 | 35-00N, 125-00E | Japan | Marine Casualty | Sunk | ||
| 15 | NAMPO MARU | Converted Gunboat | 1,206 | 14-20N, 120-20E | United States | Submarine | Sunk | ||
| 18 | TAIRYU MARU | Cargo | 2,209 | 34-33N, 125-53E | Japan | Marine Casualty | Sunk | ||
| 18 | NISSAN MARU | Cargo | 6,537 | 51-58N, 177-40E | United States | Army Aircraft | Sunk | ||
| 21 | KEIJO MARU | Converted Gunboat | 2,626 | 9-003, 160-00E | United States | Submarine | Sunk | ||
| 28 | SAIKYO MARU | Converted Gunboat | 1,292 | 12-41N, 136-22E | United States | Submarine | Sunk | ||
| 30 | UNKAI MARU NO 5 | Cargo | 3,282 | 30-04N, 122-54E | United States | Submarine | Sunk | ||
| 10 Vessels | 38,519 | ||||||||
| July | 1 | 1942 | MONTEVIDEO MARU | Transport | 7,267 | 18-37N, 119-29E | United States | Submarine | Sunk |
| 2 | UNYO MARU NO 3 | Cargo | 2,997 | 30-30N, 120-25E | United States | Submarine | Sunk | ||
| 7 | HARUNA MARU | Passenger-Cargo | 10,420 | 34-36N, 138-06E | Japan | Marine Casualty | Sunk | ||
| 8 | TENZAN MARU | Passenger-Cargo | 2,776 | 4-00S, 151-50E | United States | Submarine | Sunk | ||
| 9 | SHINSHO MARU | Motor Torpedo Boat Tender | 4,836 | 8-43N, 167-33E | United States | Submarine | Sunk | ||
| 12 | HIYAMA MARU | Cargo | 6,171 | 13-48N, 109-33E | United States | Submarine | Sunk | ||
| 13 | MIKAGE MARU NO 3 | Cargo | 3,111 | 33-00N, 133-00E | Japan | Marine Casualty | Sunk | ||
| 13 | SHINYO MARU | Passenger-Cargo | 4,163 | 13-04N, 109-39E | United States | Submarine | Sunk | ||
| 16 | HAKODATE MARU | Cargo | 5,302 | 12-55N 109-29E | United States | Submarine | Sunk | ||
| 22 | AYATOSAN MARU | Transport | 9,788 | 8-50S, 148-50E | United States Australian |
Army Aircraft Aircraft |
Sunk | ||
| 24 | UNKNOWN MARU | Cargo | 1,500e | 45-05N, 147-27E | United States | Submarine | Sunk | ||
| 28 | UNKNOWN MARU | Transport | 4,000e | 33-21N, 139-24E | United States | Submarine | Sunk | ||
| 12 Vessels | 62,331 | ||||||||
| August | 1 | 1942 | MEIWA MARU | Cargo | 2,921 | 41-12N, 141-36E | United States | Submarine | Sunk |
| 2 | ZENYO MARU | Passenger-Cargo | 6,441 | 5-36N, 99-53E | Netherlands | Submarine | Sunk | ||
| 3 | NANIWA MARU | Cargo | 4,353 | 7-37N, 150-18E | United States | Submarine | Sunk | ||
| 5 | BRASIL MARU | Transport | 12,752 | 9-50N, 150-38E | United States | Submarine | Sunk | ||
| 6 | OHIO MARU | Passenger-Cargo | 5,372 | 13-51N, 113-15E | United States | Submarine* | Sunk | ||
| 6 | PALAO MARU | Passenger-Cargo | 4,495 | 9-04N, 150-54E | United States | Submarine | Sunk | ||
| * Probably sunk | |||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| August | 7 | 1942 | SHOFUKU MARU | Converted Net Tender | 891 | 9-22N, 170-12E | United States | Submarine | Sunk |
| 8 | KOTOKU MARU | Transport | 6,701 | 7-01N, 147-07E | United States | Army Aircraft | Sunk | ||
| 8 | KANO MARU | Cargo | 8,572 | 51-58N, 177-33E | United States | Army Aircraft Surface Craft | Sunk | ||
| 8 | MEIYO MARU | Transport | 5,628 | 4-52S, 152-43E | United States | Submarine | |||
| 8 | NIKKEI MARU | Passenger-Cargo | 5,811 | 33-33N, 135-23E | United States | Submarine | Sunk | ||
| 8 | BIFUKU MARU | Passenger-Cargo | 2,559 | 41-14N, 141-32E | United States | Submarine | Sunk | ||
| 12 | UNKNOWN MARU | Cargo | 4,000e | 33-02N, 136-00E | United States | Submarine | Sunk | ||
| 14 | HACHIGEN MARU | Passenger-Cargo | 3,113 | 5-07N, 119-37E | United States | Submarine | Sunk | ||
| 21 | SHINSEI MARU NO 6 | Passenger-Cargo | 4,928 | 6-45N, 158-10E | United States | Submarine | Sunk | ||
| 22 | UNKNOWN MARU | Transport | 4,000e | 26-07N, 121-29E | United States | Submarine | Sunk | ||
| 24 | CUBA MARU | Passenger-Cargo | 5,950 | 48-00N, 142-30E | Japan | Marine Casualty | Sunk | ||
| 24 | SEIKAI MARU | Passenger-Cargo | 3,109 | 38-12N, 141-30E | United States | Submarine | Sunk | ||
| 25 | KINRYU MARU | Converted Light Cruiser | 9,310 | 7-47S, 160-13E | United States | Marine Land- Based Aircraft | Sunk | ||
| 25 | SHOWA MARU | Cargo | 1,349 | 3-55N, 118-59E | United States | Submarine | Probably sunk | ||
| 25 | SENYO MARU | Converted Gunboat | 2,904 | 22-23N, 120-10E | United States | Submarine | Sunk | ||
| 26 | TEISHUN MARU | Cargo | 2,251 | 27-05N, 121-23E | United States | Submarine | Sunk | ||
| 31 | EIFUKU MARU | Cargo | 5,866 | 25-43N, 122-38E | United States | Submarine | Sunk | ||
| 23 Vessels | 114,281 | ||||||||
| September | 2 | 1942 | TEIKYU MARU | Cargo | 2,332 | 42-08N, 141-15E | United States | Submarine | Sunk |
| 4 | KASHINO | Supply Ship | 4,000e | 25-43N, 122-33E | United States | Submarine | Sunk | ||
| 4 | CHITA MARU | Cargo | 2,276 | 40-10N, 141-53E | Unites States | Submarine | Sunk | ||
| 4 | TENYU MARU | Cargo | 3,738 | 40-14N, 141-51E | United States | Submarine | Sunk | ||
| 4 | KAIMEI MARU | Cargo | 5,254 | 40-14N, 141-51E | United States | Submarine | Sunk | ||
| 7 | TAIKA MARU | Cargo | 2,204 | 25-31N, 121-33E | United States | Submarine | Sunk | ||
| 11 | KANTO MARU | Aircraft Ferry | 8,606 | 3-16S, 118-29E | United States | Submarine | Sunk | ||
| 12 | NIYO MARU | Cargo | 1,350 | 20-15N, 92-35E | Great Britain |
Aircraft | Sunk | ||
| 19 | SHIROGANE MARU | Passenger-Cargo | 3,130 | 6-33S, 156-05E | United States | Submarine | Sunk | ||
| 21 | TONE MARU | Cargo | 4,070 | 31-18N, 123-27E | United States | Submarine | Sunk | ||
| 21 | KOEI MARU | Converted Net Tender | 863 | 6-54N, 151-51E | United States | Submarine | Sunk | ||
| 25 | TEIBO MARU | Cargo | 4,472 | 10-31N, 109-31E | United States | Submarine | Sunk | ||
| 28 | NOJIMA MARU | Cargo | 7,189 | 51-58N, 177-33E | United States | Army Aircraft | Sunk | ||
| 28 | TAMON MARU NO 6 | Cargo | 4,994 | 40-35N, 141-50E | United States | Submarine | Sunk | ||
| 14 Vessels | 54,478 | ||||||||
| October | 1 | 1942 | YOKE I MARU | Cargo | 2,860 | 33-35N, 135-15E | United States | Submarine | Sunk |
| 1 | LISBON MARU | Transport | 7,053 | 29-57N, 122-56E | United States | Submarine | Sunk | ||
| 1 | TOSEI MARU | Cargo | 2,432 | 41-20N, 141-35E | United States | Submarine | Sunk | ||
| 1 | KATSURAGI MARU | Aircraft Ferry | 8,033 | 5-51S, 153-18E | United States | Submarine | Sunk | ||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| October | 3 | 1942 | KINKAI MARU | Cargo | 5,852 | 38-46N, 142-02E | United States | Submarine | Sunk |
| 4 | SETSUYO MARU | Cargo | 4,147 | 39-48N, 142-08E | United States | Submarine | Sunk | ||
| 7 | MIDORI MARU | Passenger-Cargo | 5,827 | 31-00N, 122-30E | Japan | Marine Casualty | Sunk | ||
| 7 | SENKAI MARU | Passenger-Cargo | 2,095 | 1-55N, 153-42E | United States | Submarine | Sunk | ||
| 7 | NAMINOUE MARU | Transport | 4,731 | 3-51S, 151-21E | United States | Submarine | Sunk | ||
| 8 | BORNEO MARU | Cargo | 5,863 | 51-56N, 177-27E | United States | Army Aircraft | Sunk | ||
| 8 | HAGUE MARU | Passenger-Cargo | 5,641 | 34-06N, 136-22E | United States | Submarine | Sunk | ||
| 9 | HACHIMANZAN MARU | Cargo | 2,461 | 33-27N, 136-01E | United States | Submarine | Sunk | ||
| 10 | SHIGURE MARU | Cargo | 2,445 | 1-01S, 117-23E | United States | Submarine | Sunk | ||
| 11 | KICHIEI MARU | Cargo | 2,012 | 35-00N, 125-00E | Japan | Marine Casualty | Sunk | ||
| 14 | TEISON MARU | Transport | 7,007 | 25-22N, 121-15E | United States | Submarine | Sunk | ||
| 14 | SUMIYOSHI MARU | Cargo | 1,921 | 3-20S, 150-03E | United States | Submarine | Sunk | ||
| 14 | SHUNKO MARU | Cargo | 6,781 | 5-35N, 144-25E | United States | Submarine | Sunk | ||
| 14 | TAKUSEI MARU | Cargo | 3,515 | 39-33N, 142-15E | United States | Submarine | Sunk | ||
| 15 | KYUSHU MARU | Passenger-Cargo | 8,666 | 9-25S, 159-55E | United States | Army AircraftNavy Land- Based Aircraft Marine Land- Based Aircraft |
Sunk | ||
| 15 | SASAKO | Passenger-Cargo | 9,258 | 9-25S, 159-55E | United States | Navy Land- Based Aircraft Marine Land- Based Aircraft |
Sunk | ||
| 15 | AZUMASAN | Passenger-Cargo | 7,623 | 9-25S, 159-55E | United States | Army AircraftNavy Carrier- Based Aircraft Navy Land- Based AircraftMarine Land- Based Aircraft |
Sunk | ||
| 17 | HOLLAND MARU | Cargo | 5,869 | 32-21N, 132-04E | United States | Submarine | Sunk | ||
| 18 | HAKONESAN MARU | Cargo | 6,673 | 38-46N, 142-03E | United States | Submarine | Sunk | ||
| 20 | RYUNAN MARU | Cargo | 5,106 | 34-08N, 136-46E | United States | Submarine | Sunk | ||
| 20 | YAMAFUJI MARU | Cargo | 5,359 | 24-26N, 120-26E | United States | Submarine | Sunk | ||
| 20 | AFRICA MARU | Cargo | 9,475 | 24-26N, 120-26E | United States | Submarine | Sunk | ||
| 21 | CHOKO MARU | Passenger-Cargo | 6,783 | 3-30S, 150-30E | United States | Submarine | Sunk | ||
| 21 | UNKNOWN MARU | Cargo | 4,000e | 27-03N, 122-42E | United States | Submarine | Sunk | ||
| 21 | NICHIHO MARU | Cargo | 6,363 | 27-03N, 122-42E | United States | Submarine | Sunk | ||
| 22 | HAKKAISAN MARU | Converted Gunboat | 3,311 | 3-30S, 175-15E | United States | Surface Craft | Sunk | ||
| 23 | SEIKYO MARU | Converted Gunboat | 2,608 | 33-45N, 135-25E | United States | Submarine | Sunk | ||
| 24 | KENUN MARU | Cargo | 4,643 | 41-24N, 141-50E | United States | Submarine | Sunk | ||
| 25 | KOTOBUKI MARU NO 5 | Converted Net Tender | 720 | United States | Army Aircraft | Sunk | |||
| 26 | KEIZAN MARU | Cargo | 2,864 | 50-09N, 155-37E | United States | Submarine | Sunk | ||
| 27 | UNKNOWN MARU | Passenger-Cargo | 4,000e | 10-20N, 108-43E | United States | Submarine | Sunk | ||
| 31 | UNKNOWN MARU | Cargo | 3,000e | 4-40S, 118-54E | United States | Submarine | Probably sunk | ||
| 36 Vessels | 176,997 | ||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| November | 1 | 1942 | BIWA MARU | Cargo | 3,350 | 3-54S, 109-13E | Japan | Marine Casualty | Sunk |
| 2 | YASUKAWA MARU | Passenger-Cargo | 6,710 | 8-41S, 148-27E | United States | Army Aircraft | Sunk | ||
| 2 | GIFU MARU | Cargo | 2;933 | 6-14N, 126-07E | United States | Submarine | Sunk | ||
| 3 | TEKKAI MARU | Cargo | 1,925 | 32-02N, 126-15E | United States | Submarine | Sunk | ||
| 3 | SAGAMI MARU | Passenger-Cargo | 7,189 | 7-02N, 125-33E | United States | Submarine | Sunk | ||
| 3 | CHKUGO MARU | Cargo | 2,461 | 20-18N, 108-39E | United States | Submarine | Sunk | ||
| 8 | KEIKO MARU | Converted Gunboat | 2,929 | 6-22N, 126-03E | United States | Submarine | Sunk | ||
| 10 | UNKNOWN MARU | Cargo | 4,000e | 7-12N, 150-47E | United States | Submarine | Sunk | ||
| 11 | KOBE MARU | Transport | 7,938 | 31-27N, 124-13E | Japan | Marine Casualty | Sunk | ||
| 11 | TENZAN MARU | Cargo | 3,142 | 31-27N, 124-13E | Japan | Marine Casualty | Sunk | ||
| 11 | HOKOKU MARU | Converted Light Cruiser | 10,439 | 20-00S, 93-00E | Great Britain Netherlands |
Surface Craft Surface Craft | Sunk | ||
| 11 | VENICE MARU | Passenger-Cargo | 6,571 | 35-36N, 123-44E | United States | Submarine | Sunk | ||
| 14 | SHINANOGAWA MARU | Cargo | 7,503 | 8-30S, 158-45E | United States | Army Aircraft Navy Carrier- Based Aircraft Marine Carrier- Based Aircraft |
Sunk | ||
| 14 | NAKO MARU | Cargo | 7,145 | 8-30S, 158-45E | United States | Army Aircraft Navy Carrier- Based Aircraft Marine Carrier- Based Aircraft |
Sunk | ||
| 14 | NAGARA MARU | Passenger-Cargo | 7,148 | 8-30S, 158-45E | United States | Army Aircraft Navy Carrier- Based Aircraft Marine Carrier- Based Aircraft |
Sunk | ||
| 14 | SADO MARU | Cargo | 7,180 | 8-30S, 158-45E | United States | Army Aircraft Navy Carrier- Based Aircraft Marine Carrier- Based Aircraft |
Sunk | ||
| 14 | CANBERRA MARU | Cargo | 6,477 | 3-30S, 158-45E | United States | Army Aircraft Navy Carrier- Based Aircraft Marine Carrier- Based Aircraft |
Sunk | ||
| 14 | BRISBANE MARU | Cargo | 5,425 | 8-30S, 158-45E | United States | Army Aircraft Navy Carrier- Based Aircraft Marine Carrier- Based Aircraft |
Sunk | ||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| November | 14 | 1942 | ARIZONA MARU | Cargo | 9,684 | 8-30S, 158-45E | United States | Army Aircraft Navy Carrier- Based Aircraft Marine Land- Based Aircraft |
Sunk |
| 15 | YAMAZUKI MARU | Cargo | 6,439 | 9-20S, 159-50E | United States | Navy Land- Based Aircraft Marine Land- Based Aircraft |
Sunk | ||
| 15 | YAMAURA MARU | Cargo | 6,798 | 9-20S, 159-50E | United States | Army Aircraft Navy Land- Based Aircraft Marine Carrier- Based Aircraft Surface Craft |
Sunk | ||
| 15 | KINUGAWA MARU | Cargo | 6,937 | 9-20S, 159-50E | United States | Army Aircraft Navy Land- Based Aircraft Marine Land- Based Aircraft Surface Craft |
Sunk | ||
| 15 | HIROKAWA MARU | Cargo | 6,872 | 9-20S, 159-50E | United States | Army Aircraft Navy Land- Based Aircraft Marine Land- Based Aircraft Surface Craft |
Sunk | ||
| 16 | BOSTON MARU | Transport | 5,477 | 6-18N, 135-20E | United States | Submarine | Sunk | ||
| 17 | OREGON MARU | Converted Salvage Vessel | 5,873 | 14-46N, 119-44E | United States | Submarine | Sunk | ||
| 18 | HAVANA MARU | Passenger-Cargo | 5,652 | 6-48S, 155-49E | United States | Army Aircraft | Sunk | ||
| 22 | KHAI DINH | Cargo | 5,110 | 20-58N, 106-40E | United States | Army Aircraft | Sunk | ||
| 26 | CHERIBON MARU | Cargo | 4,016 | 52-45N, 173-15E | United States | Army Aircraft | Sunk | ||
| 27 | RYOKUSEI MARU | Cargo | 1,907 | 23-11N, 113-14E | United States | Army Aircraft | Sunk | ||
| 30 | UNKAI MARU NO 3 | Cargo | 3,023 | Off Japan | Unknown | Unknown | Probably sunk | ||
| 30 Vessels | 168,253 | ||||||||
| December | 4 | 1942 | MANSEI MARU | Passenger-Cargo | 7,770 | 23-30N, 119-34E | Japan | Marine Casualty | Sunk |
| 7 | HINO MARU NO 3 | Passenger-Cargo | 4,391 | 23-59N, 138-43E | United States | Submarine | Sunk | ||
| 8 | HE IN AN MARU | Cargo | 661 | 00-52N, 118-54E | United States | Submarine | Sunk | ||
| 10 | KAMOI MARU | Cargo | 5,355 | 4-56S, 154-58E | United States | Submarine | Sunk | ||
| 12 | GYOKUZAN MARU | Cargo | 1,970 | 40-19N, 142-27E | United States | Submarine* | Sunk | ||
| 16 | GENZAN MARU | Passenger-Cargo | 5,708 | 41-10N, 141-32E | United States | Submarine* | Sunk | ||
| 16 | SHINGO MARU | Cargo | 4,740 | a-10N, 141-32E | United States | Submarine | Sunk | ||
| 17 | BANDOENG MARU | Passenger-Cargo | 4,003 | 4-54S, 154-17E | United States | Submarine | Sunk | ||
| * Probable Agent | |||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| December | 20 | 1942 | UNKNOWN MARU | Cargo | 4,000e | 35-45N, 140-55E | United States | Navy Mine | Sunk |
| 22 | TEIFUKU MARU | Cargo | 5,198 | 34-52N, 139-49E | United States | Submarine | Sunk | ||
| 24 | TAMA MARU NO 2 | Cargo | 515 | 6-15S, 150-10E | United States | Array Aircraft | Sunk | ||
| 24 | AMAKASU MARU NO 1 | Converted Water carrier | 1,913 | 19-16N, 166-37E | United States | Submarine | Sunk | ||
| 25 | BANSHU MARU NO 2 | Cargo | 1,000 | 9-00S, 124-00E | United States | Submarine | Sunk | ||
| 26 | IWAMI MARU | Passenger-Cargo | 773 | 8-44S, 158-06E | United States | Army Aircraft Navy Carrier- Based Aircraft |
Sunk | ||
| 27 | ITALY MARU | Transport | 5,859 | 4-15S, 152-10E | United States | Army Aircraft | Sunk | ||
| 27 | TSURUGISAN MARU | Cargo | 3,108 | 4-13S, 152-11E | United States | Army Aircraft | Sunk | ||
| 28 | CHOYO MARU | Cargo | 5,388 | 24-46N, 120-40E | United States | Submarine | Sunk | ||
| 28 | OMI MARU | Passenger-Cargo | 3,393 | 6-23N, 160-17E | United States | Submarine | Sunk | ||
| 29 | FUKKEN MARU | Passenger-Cargo | 2,558 | 20-04N, 109-18E | United" States | Navy Mine* | Sunk | ||
| 29 | AZUSA MARU | Cargo | 540 | 8-39S, 158-00E | United States | Army Aircraft Marine Land- Based Aircraft |
Sunk | ||
| 29 | HACHIAN MARU | Cargo | 2,733 | 4-45S, 113-54E | United States | Submarine | Sunk | ||
| 30 | TOMIURA MARU | Passenger-Cargo | 3,821 | 4-15S, 152-10E | United States | Army Aircraft | Sunk | ||
| 30 | URAJIO MARU | Cargo | 3,110 | 51-58N, 177-33E | United States | Army Aircraft | Sunk | ||
| 30 | UNKNOWN MARU | Cargo | 4,000e | 00-41N, 148-52E | United States | Submarine | Sunk | ||
| 30 | HITERU MARU | Cargo | 5,857 | 00-41N, 148-52E | United States | Submarine | Sunk | ||
| 25 Vessels | 88,364 | ||||||||
| January | 1 | 1943 | RENZAN MARU | Cargo | 4,999 | 39-11N, 141-44E | United States | Submarine | Sunk |
| 5 | KOTOHIRA MARU | Cargo | 6,101 | 53-00N, 173-10E | United States | Army Aircraft | Sunk | ||
| 5 | KEIFUKU MARU | Cargo | 5,333 | 4-21S, 152-17E | United States | Army Aircraft | Sunk | ||
| 5 | MONTREAL MARU | Cargo | 6,577 | 52-40N, 178-15E | United States | Army Aircraft | Sunk | ||
| 7 | NICHIRYU MARU | Passenger-Cargo | 5,447 | 6-30S, 149-00E | United States | Army Aircraft | Sunk | ||
| 8 | MYOKO MARU | Cargo | 4,103 | 6-49S, 147-04E | United States | Army Aircraft | Sunk | ||
| 9 | YOSHINOGAWA MARU | Cargo | 1,430 | 6-13S, 156-00E | United States | Submarine | Sunk | ||
| 13 | IWASHIRO MARU | Cargo | 3,550 | 9-54N, 167-07E | United States | Submarine | Sunk | ||
| 14 | SHIRAHA MARU | Cargo | 5,693 | 9-12N, 130-38E | United States | Submarine | Sunk | ||
| 15 | NICHIMEI MARU | Cargo | 4,704 | 13-30N, 98-30E | United States | Army Aircraft | Sunk | ||
| 16 | CHIFUKU MARU | Passenger-Cargo | 5,857 | 4-00S, 151-55E | United States | Submarine | Sunk | ||
| 16 | KINPOSAN MARU | Cargo | 3,261 | 2-47S, 149-10E | United States | Submarine | Sunk | ||
| 17 | UNKNOWN MARU | Cargo | 4,000e | 34-31N, 137-43E | United States | Submarine | Sunk | ||
| 17 | HEIYO MARU | Passenger-Cargo | 9,315 | 10-13N, 151-25E | United States | Submarine | Sunk | ||
| 18 | SENSAN MARU | Cargo | 2,775 | 3-53S, 149-20E | United States | Army Aircraft | Sunk | ||
| 18 | TOKACHI MARU | Cargo | 1,932 | 6-50S, 112-12E | Japan | Mine | Sunk | ||
| 18 | TOEI MARU | Tanker | 10,023 | 6-21N, 150-23E | United States | Submarine | Sunk | ||
| * Probable Agent | |||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| January | 19 | 1943 | MYOHO MARU | Cargo | 4,122 | 5-30S, 156-00E | United States | Submarine | Sunk |
| 20 | SOMEDONO MARU | Passenger-Cargo | 5,154 | 3-52N, 153-56E | United States | Submarine | Sunk | ||
| 20 | SURABAYA MARU | Cargo | 4,391 | 3-52N, 153-56E | United States | Submarine | Sunk | ||
| 20 | MEIU MARU | Cargo | 8,230 | 3-52N, 153-56E | United States | Submarine | Sunk | ||
| 21 | KENKON MARU | Transport | 4,575 | 6-12S, 155-51S | United States | Submarine | Sunk | ||
| 21 | UNKNOWN MARU | Cargo | 2,934e | 11-25N, 109-22E | United States | Submarine | Sunk | ||
| 22 | TETSUZAN MARU | Cargo | 1,922 | 4-15S, 152-10E | United States | Army Aircraft | Sunk | ||
| 22 | UNKNOWN MARU | Cargo | 4,000e | 3-55S, 152-07E | United States | Submarine | Sunk | ||
| 22 | HASSHU MARU | Passenger-Cargo | 1,873 | 5-40S, 120-35E | United States | Submarine | Sunk | ||
| 26 | USHIO MARU | Cargo | 749 | 13-26N, 121-16E | United States | Submarine | Sunk | ||
| 26 | TOKAI MARU | Passenger-Cargo | 8,358 | 13-27N, 144-37E | United States | Submarine | Sunk | ||
| 26 | UNKNOWN MARU | Cargo | 4,000e | 2-37N, 139-42E | United States | Submarine | Sunk | ||
| 26 | BUYO MARU | Transport | 5,447 | 1-55N, 139-14E | United States | Submarine | Sunk | ||
| 26 | FUKUEI MARU NO 2 | Cargo | 1,901 | 1-55N, 139-14E | United States | Submarine | Sunk | ||
| 27 | SHOAN MARU | Passenger-Cargo | 5,624 | 14-15N, 153-43E | United States | Submarine | Sunk | ||
| 29 | NICHIUN MARU | Cargo | 2,723 | 6-21S, 156-04E | United States | Submarine | Sunk | ||
| 31 | TOA MARU NO 2 | Cargo | 6,732 | 7-50S, 156-50E | United States | Marine Land- Based Aircraft |
Sunk | ||
| 34 Vessels | 158,885 | ||||||||
| February | 1 | 1943 | FUSHIMI MARU | Passenger-Cargo | 10,935 | 34-16N, 138-17E | United States | Submarine | Sunk |
| 2 | KENKOKU | 954 | |||||||
| 6 | GISHO MARU | Cargo | 543 | 4-30S, 151-30E | United States | Army Aircraft | Sunk | ||
| 3 | SHOTOKU MARU | Cargo | 1,146 | 35-26N, 132-33E | Japan | Marine Casualty | Sunk | ||
| 8 | KUSUYAMA MARU | Cargo | 5,306 | 22-40N, 119-12E | United States | Submarine | Sunk | ||
| 8 | TATSUTA MARU | Transport | 16,975 | 33-45N, 140-25E | United States | Submarine | Sunk | ||
| 12 | TIEN LEE | Cargo | 2,184 | 40-00N, 143-00E | Japan | Mine | Sunk | ||
| 14 | HITACHI MARU | Cargo | 6,540 | 6-45S, 155-50E | United States | Navy Land- Based Aircraft |
Sunk | ||
| 14 | HIROTAMA MARU | Converted Gunboat | 1,911 | 4-11S, 117-45E | United States | Submarine | Sunk | ||
| 15 | KOKOKU MARU | Cargo | 544 | 5-32S, 150-09S | United States | Army Aircraft | Sunk | ||
| 15 | SURUGA MARU | Cargo | 991 | 6-27S, 156-02E | United States | Submarine | Sunk | ||
| 15 | TATEYAMA MARU | Cargo | 1,990 | 39-18N, 142-08E | United States | Submarine | Sunk | ||
| 16 | HYUGA MARU | Cargo | 994 | 13-30N, 145-47E | United States | Submarine | Sunk | ||
| 19 | HIBARI MARU | Cargo | 6,550 | 6-45S, 155-50E | United States | Submarine Navy Land- Based Aircraft |
Sunk | ||
| 19 | UNKNOWN MARU | Cargo | 6,500e | 6-45S, 155-50E | United States | Army Aircraft | Sunk | ||
| 19 | AKAGANE MARU | Cargo | 3,121 | 53-05N, 171-22E | United States | Surface Craft | Sunk | ||
| 20 | SHINKOKU MARU | Passenger-Cargo | 3,991 | 15-09N, 159-30E | United States | Submarine | Sunk | ||
| 21 | KUWAYAMA MARU | Cargo | 5,724 | 7-53S, 119-13E | United States | Submarine | Sunk | ||
| 27 | KIRIKAWA MARU | Transport | 3,836 | 7-30S, 136-40E | United States | Army Aircraft Navy Land- Based Aircraft |
Sunk | ||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| February | 27 | 1943 | ASAKASAN MARU | Passenger-Cargo | 8,709 | 15-53N, 97-40E | United States | Army Aircraft | Sunk |
| 28 | KASHII MARU | Cargo | 3.218 | 34-39N, 138-58E | Japan | Marine Casualty | Sunk | ||
| 21 Vessels | 92,662 | ||||||||
| March | 2 | 1943 | KYOKUSEI MARU | Cargo | 5,493 | 5-05S, 148-28E | United States | Army Aircraft | Sunk |
| 2 | TOEN MARU | Tanker | 5,232 | 3-29S, 117-17E | United States | Submarine | Sunk | ||
| 3 | KEIZAN MARU | Cargo | 2,319 | 38-00N, 119-00E | Japan | Marine Casualty | Sunk | ||
| 3 | KEMBU MARU | Cargo | 953 | 7-15S, 148-30E | United States | Army Aircraft | Sunk | ||
| 3 | TAIMEI MARU | Cargo | 2,883 | 7-15S, 148-30E | United States Australia | Army Aircraft Aircraft |
Sunk | ||
| 3 | SHINAI MARU | Cargo | 3,793 | 7-15S, 148-30E | United States Australia | Army Aircraft Aircraft |
Sunk | ||
| 3 | TEIYO MARU | Cargo | 6,869 | 7-15S, 148-30E | United States Australia | Army Aircraft Aircraft |
Sunk | ||
| 3 | NOJIMA | Collier | 4,500e | 7-15S, 148-30E | United States Australia | Army Aircraft Aircraft |
Sunk | ||
| 3 | AIYO MARU | Cargo | 2,746 | 7-15S, 148-30E | United States Australia | Army Aircraft Aircraft |
Sunk | ||
| 3 | OIGAWA MARU | Cargo | 6,493 | 7-15S, 148-30E | United States United States Australia |
Army Aircraft Surface Craft Aircraft |
Sunk | ||
| 3 | NICHIYU MARU | Passenger-Cargo | 6,817 | 10-22N, 145-21E | United States | Submarine | Sunk | ||
| 4 | HOKUTO MARU | Cargo | 2,270 | 42-00N, 141-00E | Japan | Mine* | Sunk | ||
| 6 | KIRIHA MARU | Cargo | 3,057 | 00-001, 145-00E | United States | Submarine | Sunk | ||
| 8 | HISASHIMA MARU | Cargo | 2,742 | 41-16N, 142-27E | United States | Submarine | Sunk | ||
| 10 | KAIJO MARU | Tanker | 3,270 | 5-33S, 122-55E | United States | Army Aircraft | Sunk | ||
| 12 | TAIHOSAN MARU | Converted Water Carrier | 1,805 | 7-15N, 159-10E | United States | Submarine | Sunk | ||
| - | 13 | KASUGA MARU NO 2 | Cargo | 3,967 | 11-40N, 92-50E | Netherlands | Submarine | Sunk | |
| 13 | MOMOYAMA MARU | Cargo | 5,217 | 2-45S, 143-20E | United States | Army Aircraft | Sunk | ||
| 13 | KOSEI MARU | Cargo | 3,262 | 29-04N, 129-17E | United States | Submarine | Sunk | ||
| 15 | MOMOHA MARU | Cargo | 3,103 | 00-00N, 145-00E | United States | Submarine | Sunk | ||
| 19 | TAKACHIHO MARU | Transport | 8,154 | 26-00N, 122-18E | United States | Submarine | Sunk | ||
| 19 | ZOGEN MARU | Cargo | 1,428 | 38-29N, 122-19E | United States | Submarine | Sunk | ||
| 19 | KOWA MARU | Transport | 3,217 | 38-27N, 122-18E | United States | Submarine | Sunk | ||
| 21 | NITTSU MARU | Cargo | 2,183 | 38-05N, 124-33E | United States | Submarine | Sunk | ||
| * Probable Agent | |||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| March | 21 | 1943 | HOZAN MARU | Cargo | 2,260 | 38-11N, 124-33E | United States | Submarine | Sunk |
| 22 | MEIGEN MARU | Cargo | 5,434 | 6-31S, 112-47E | United States | Submarine | Sunk | ||
| 23 | UNKNOWN MARU | Cargo | 2,427e | 38-37N, 121-01E | United States | Submarine | Sunk | ||
| 23 | KENYO MARU | Cargo | 6,486 | 17-16N, 144-56E | United States | Submarine | Sunk | ||
| 24 | TAKAOSAN MARU | Cargo | 2,076 | 39-01N, 122-25E | United States | Submarine | Sunk | ||
| 25 | SATSUKI MARU | Cargo | 827 | 38-10N, 123-26E | United States | Submarine | Sunk | ||
| 25 | UNKNOWN MARU | Cargo | 2,556e | 38-13N, 123-24E | United States | Submarine | Sunk | ||
| 28 | FUNAKAWA MARU | Tanker | 862 | 41-22N, 141-22E | Japan | Marine Casualty | Sunk | ||
| 28 | SUWA MARU | Transport | 10,672 | 19-13N, 166-34E | United States | Submarine | Sunk | ||
| 29 | TOHO MARU | Tanker | 9,997 | 00-00N, 118-18E | United States | Submarine | Sunk | ||
| 29 | YAMABATO MARU | Cargo | 2,556 | 30-26N, 129-41E | United States | Submarine | Sunk | ||
| 30 | KUROHIME MARU | Cargo | 4,697 | 00-22S, 147-46E | United States | Submarine | Sunk | ||
| 31 | NANSHNI MARU | Cargo | 4,911 | 34-13N, 133-06E | Japan | Marine Casualty | Sunk | ||
| 37 Vessels | 147,540 | ||||||||
| April | 2 | 1943 | FLORIDA MARU | Passenger-Cargo | 5,854 | 2-40S, 150-40E | United States | Army Aircraft | Sunk |
| 2 | TOYO MARU NO 2 | Cargo | 4,163 | 7-23N, 149-13E | United States | Submarine | Sunk | ||
| 3 | ARIMA MARU | Passenger-Cargo | 7,389 | 10-26N, 135-00E | United States | Submarine | Sunk | ||
| 4 | KOA MARU | Cargo | 2,024 | 13-11N, 161-57E | United States | Submarine | Sunk | ||
| 7 | KOSEI MARU | Passenger-Cargo | 8,237 | 8-50N, 147-06E | United States | Submarine | Sunk | ||
| 7 | FUKUEI MARU | Cargo | 1,113 | 41-00N, 142-00E | United States | Submarine* | Sunk | ||
| 8 | TOYO MARU | Cargo | 1,916 | 10-26N, 135-00E | United States | Submarine | Sunk | ||
| 9 | OYAMA MARU | Cargo | 3,809 | 00-32N, 150-05E | United States | Submarine | Sunk | ||
| 9 | SHANGHAI MARU | Cargo | 4,103 | 13-11N, 121-45E | United States | Submarine | Sunk | ||
| 9 | PENANG MARU | Cargo | 5,214 | 5-29S, 123-02E | United States | Submarine | Sunk | ||
| 12 | SAPPORO MARU NO 12 | Cargo | 2,865 | 41-23N, 141-30E | United States | Submarine | Sunk | ||
| 14 | INDIA MARU | Cargo | 5,872 | 3-25S, 143-40E | United States | Army Aircraft | Sunk | ||
| 14 | SYDNEY MARU | Passenger-Cargo | 4,105 | 4-10S, 144-55E | United States | Army Aircraft | Sunk | ||
| 15 | KAIHEI MARU | Cargo | 4,575 | 21-06N, 151-45E | United States | Submarine | Sunk | ||
| 17 | TRAN NINH | Cargo | 1,463 | 10-30N, 107-00E | Japan | Marine Casualty | Sunk | ||
| 17 | NISSHIN MARU NO 2 | Tanker | 17,579 | Off Formosa | Unknown | Unknown | Sunk | ||
| 17 | AMAHO MARU | Cargo | 2,769 | 42-04N, 143-22E | United States | Submarine | Sunk | ||
| 17 | TATSUNAN MARU | Cargo | 6,417 | 6-50S, 155-45E | United States | Navy Mine | Sunk | ||
| 18 | NISSHUN MARU | Cargo | 6,380 | 1-55N, 148-24E | United States | Submarine | Sunk | ||
| 20 | SUMERUSAN MARU | Passenger-Cargo | 1,871 | 6-51S, 112-45E | Japan | Marine Casualty | Sunk | ||
| 20 | KOSEI MARU | Cargo | 864 | 3-30S, 143-30S | United States | Army Aircraft | Sunk | ||
| 20 | MEIJI MARU NO 1 | Converted Gunboat | 1,934 | 37-10N, 141-25E | United States | Submarine | Sunk | ||
| 22 | YAMAZATO MARU | Passenger-Cargo | 6,925 | 3-28N, 99-47E | Netherlands | Submarine | Sunk | ||
| 24 | KASUGA MARU | Cargo | 1,377 | 41-43N, 141-21E | United States | Submarine | Sunk | ||
| * Probable Agent | |||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| April | 27 | 1943 | YUZAN MARU | Passenger-Cargo | 6,380 | 33-08N, 143-03E | United States | Submarine | Sunk |
| 23 | KAMAKURA MARU | Transport | 17,526 | 10-18N, 121-44E | United States | Submarine | Sunk | ||
| 26 Vessels | 132,724 | ||||||||
| May | 1 | 1943 | KEISHIN MARU | Converted Gunboat | 1,434 | 37-04N, 141-06E | United States | Submarine | Sunk |
| 2 | TAMON MARU | Cargo | 8,156 | 27-18N, 121-38E | United States | Submarine | Sunk | ||
| 4 | SAN CLEMENTE MARU | Tanker | 7,354 | 6-54N, 134-55E | United States | Submarine | Sunk | ||
| 5 | HAKKAI MARU | Cargo | 2,921 | 34-11N, 137-41E | United States | Submarine | Sunk | ||
| 5 | KINKO MARU | Cargo | 1,263 | 38-39N, 122-36E | United States | Submarine | Sunk | ||
| 5 | DAIFUKU MARU | Cargo | 3,194 | 38-39N, 122-36E | United States | Submarine | Sunk | ||
| 7 | TAMON MARU NO 5 | Passenger-Cargo | 5,260 | 40-05N, 141-53E | United States | Submarine | Sunk | ||
| 7 | TOSEI MARU | Cargo | 4,363 | 36-05N, 123-21E | United States | Submarine | Sunk | ||
| 8 | TOMIOKA MARU | Cargo | 970 | 5-12S, 145-50E | United States | Army Aircraft | Sunk | ||
| 8 | SUMIDA MARU | Cargo | 546 | 5-12S, 145-50E | United States | Army Aircraft | Sunk | ||
| 9 | ASO MARU | Cargo | 703 | 9-09N, 122-50E | United States | Submarine | Sunk | ||
| 9 | TAKAO MARU | Passenger-Cargo | 3,204 | 38-57N, 141-49E | United States | Submarine | Sunk | ||
| 9 | JINMU MARU | Cargo | 1,912 | 38-57N, 141-49E | United States | Submarine | Sunk | ||
| 10 | TATSUTAKE MARU | Passenger-Cargo | 7,068 | 14-29N, 149-002 | United States | Submarine | Sunk | ||
| 10 | KINAI MARU | Passenger-Cargo | 8,360 | 14-29N, 149-00E | United States | Submarine | Sunk | ||
| 11 | YODOGAWA MARU | Cargo | 6,441 | 00-47S, 149-02E | United States | Submarine | Sunk | ||
| 12 | SUMATRA MARU | Cargo | 5,862 | 12-43N, 124-08E | United States | Submarine* | Sunk | ||
| 14 | HOUN MARU | Cargo | 1,917 | 6-47S, 155-51E | United States | Marine Land-Based Aircraft | Sunk | ||
| 15 | MEIKAI MARU | Passenger-Cargo | 3,197 | 13-07N, 121-49E | United States | Submarine | Sunk | ||
| 15 | INDUS MARU | Passenger-Cargo | 4,361 | 13-07N, 121-49E | United States | Submarine | Sunk | ||
| 17 | WOOSUNG MARU | Cargo | 3,090 | 35-00N, 140-00E | Japan | Marine Casualty | Sunk | ||
| 17 | ENGLAND MARU | Cargo | 5,330 | 1-00S, 148-40E | United States | Submarine | Sunk | ||
| 18 | TERUSHIMA MARU | Converted Gunboat | 3,110 | 8-45N, 170-30E | United States | Submarine | Probably sunk | ||
| 20 | BANGKOK MARU | Converted Light Cruiser | 5,350 | 5-47N, 169-42E | United States | Submarine | Sunk | ||
| 26 | TAINAN MARU | Cargo | 1,989 | 37-03N, 141-09E | United States | Submarine | Sunk | ||
| 26 | KAGI MARU | Transport | 2,343 | 28-45N, 129-37E | United States | Submarine | Sunk | ||
| 26 | SHOEI MARU | Cargo | 3,580 | 14-17N, 144-53E | United States | Submarine | Sunk | ||
| 27 | KOCHI MARU | Cargo | 2,910 | 8-41N, 134-02E | United States | Submarine | Sunk | ||
| 28 | KAMIKAWA MARU | Converted Seaplane Tender | 6,853 | 1-36S, 150-24E | United States | Submarine | Sunk | ||
| 28 | SEIKI MARU | Cargo | 1,036 | 50-38N, 155-15E | United States | Submarine | Sunk | ||
| 28 | AKATSUKI MARU | Tanker | 10,216 | 27-32N, 126-08E | United States | Submarine | Sunk | ||
| 29 | EISHO MARU | Cargo | 2,486 | 17-35N, 110-45E | United States | Submarine | Sunk | ||
| 30 | TAKAMISAN MARU | Cargo | 1,992 | 30-07N, 124-32E | United States | Submarine | Sunk | ||
| 30 | SHOKO MARU | Cargo | 5,335 | 30-07N, 124-32E | United States | Submarine | Sunk | ||
| 34Vessels | 134,661 | ||||||||
| * Probable Agent | |||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| June | 1 | 1943 | NOBORIKAWA MARU | Cargo | 2,182 | United States | Submarine | Sunk | |
| 5 | SHINTOKU MARU | Cargo | 780 | 6-50S, 155-45S | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 6 | SHINEI MARU | Cargo | 973 | 7-00N, 123-37E | United States | Submarine | Sunk | ||
| 3 | KAHOKU MARU | Converted Gunboat | 3,350 | 9-07N, 134-31E | United States | Submarine | Sunk | ||
| 11 | GENOA MARU | Cargo | 6,785 | 7-36N, 134-17E | United States | Submarine | Sunk | ||
| 11 | JINBU MARU | Cargo | 5,228 | 50-23N, 155-36E | United States | Submarine | Sunk | ||
| 11 | HIDE MARU | Cargo | 5,256 | 2-47N, 152-00E | United States | Submarine | Sunk | ||
| 11 | SEINAN MARU | Cargo | 1,338 | 41-00N, 141-30E | United States | Submarine* | Sunk | ||
| 13 | KONAN MARU | Passenger-Cargo | 5,226 | 6-05N, 138-25E | United States | Submarine | Sunk | ||
| 13 | SUZUYA MARU | Cargo | 901 | 3-08S, 151-24E | United States | Submarine | Sunk | ||
| 15 | KOYO MARU | Cargo | 6,435 | 33-55N, 127-38E | United States | Submarine | Sunk | ||
| 15 | SHINJU MARU | Cargo | 3,617 | 39-13N, 142-00E | United States | Submarine | Sunk | ||
| 15 | SANRAKU MARU | Tanker | 3,000 | 5-09N, 119-38E | United States | Submarine | Sunk | ||
| 17 | MYOKO MARU | Passenger-Cargo | 5,087 | 2-03S, 153-44E | United States | Submarine* | Sunk | ||
| 19 | TOKIWA MARU | Cargo | 6,971 | 32-31N, 126-19E | United States | Submarine | Sunk | ||
| 19 | MIYADONO MARU | Passenger-Cargo | 5,196 | 1-38N, 148-14E | United States | Submarine | Sunk | ||
| 20 | SHOJIN MARU | Cargo | 4,739 | 24-39N, 118-52E | United States | Submarine | Sunk | ||
| 20 | MEITEN MARU | Cargo | 4,474 | 15-57N, 140-55E | United States | Submarine | Sunk | ||
| 21 | HONGKONG MARU | Transport | 2,797 | Off Formosa | Unknown | Unknown | Sunk | ||
| 23 | SAGARA MARU | Converted Seaplane Tender | 7,189 | 33-45N, 138-10E | United States | Submarine | Sunk | ||
| 25 | IBURI MARU | Passenger-Cargo | 3,291 | 39-34N, 142-06E | United States | Submarine | Sunk | ||
| 26 | SHINRYU MARU | Passenger-Cargo | 4,936 | 48-06N, 153-15E | United States | Submarine* | Sunk | ||
| 26 | TOYO MARU | Passenger-Cargo | 4,163 | 33-22N, 138-56E | United States | Submarine | Sunk | ||
| 26 | SHOZAN MARU | Cargo | 5,859 | 33-22N, 138-56E | United States | Submarine | Sunk | ||
| 23 | SHOTOKU MARU | Converted Gunboat | 1,964 | 14-10N, 145-03E | United States | Submarine | Sunk | ||
| 29 | MIKAGE MARU NO 8 | Cargo | 3,371 | 45-04N, 142-03E | Japan | Marine Casualty | Sunk | ||
| 26 Vessels | 105,108 | ||||||||
| July | 1 | 1943 | YONEYAMA MARU | Passenger-Cargo | 5,274 | 00-20N, 119-32E | United States | Submarine | Sunk |
| 2 | KASHI MARU | Cargo | 654 | 8-06S, 157-20E | United States | Army Aircraft | Sunk | ||
| 2 | CANTON MARU | Cargo | 2,820 | 25-07N, 119-18E | United States | Submarine | Sunk | ||
| 2 | BANSHU MARU NO 7 | Cargo | 5,430 | 52-30N, 156-12E | United States | Submarine | Sunk | ||
| 2 | ISUZU MARU | Cargo | 2,866 | 13-36N, 121-49E | United States | Submarine | Sunk | ||
| 3 | ANZAN MARU | Cargo | 3,890 | 38-08N, 124-20E | United States | Submarine | Sunk | ||
| 3 | KOKURYU MARU | Passenger-Cargo | 6,112 | 38-08N, 124-20E | United States | Submarine | Sunk | ||
| 4 | NIKKYU MARU | Cargo | 6,529 | 34-31N, 138-35E | United States | Submarine | Sunk | ||
| 4 | KOKI MARU | Cargo | 5,290 | 28-40N, 124-10E | United States | Submarine | Sunk | ||
| 4 | LIVERPOOL MARU | Cargo | 5,865 | 28-40N, 124-10E | United States | Submarine | Sunk | ||
| 6 | BANSHU MARU NO 33 | Cargo | 737 | 43-35N, 140-21E | United States | Submarine | Sunk | ||
| * Probable Agent | |||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| July | 7 | 1943 | SHOWA MARU | Passenger-Cargo | 2,212 | 43-14N, 139-53E | United States | Submarine | Sunk |
| 11 | TAIKO MARU | Cargo | 1,925 | 12-53N, 131-49E | United States | Submarine | Sunk | ||
| 12 | TAIRYO MARU | Cargo | 1,423 | 20-52N, 106-41E | United States | Army Aircraft | Sunk | ||
| 12 | CHIKUZAN MARU | Cargo | 1,840 | 20-52N, 106-41E | United States | Army Aircraft | Sunk | ||
| 12 | NIITAKA MARU | Passenger-Cargo | 2,478 | 43-02N, 140-00E | United States | Submarine | Sunk | ||
| 15 | URADO MARU | Passenger-Cargo | 1,336 | 33-59N, 132-44E | Japan | Marine Casualty | Sunk | ||
| 17 | FUZAN MARU | Cargo | 1,972 | 46-57N, 141-42E | Japan | Marine Casualty | Sunk | ||
| 19 | MIKAGE MARU NO 20 | Passenger-Cargo | 2,718 | 18-34N, 166-20E | United States | Submarine | Sunk | ||
| 21 | SAIPAN MARU | Transport | 5,533 | 16-18N, 134-09E | United States | Submarine | Sunk | ||
| 24 | MIE MARU | Cargo | 2,913 | 2-45S, 133-40E | Australia | Mine | Sunk | ||
| 25 | THAMES MARU | Cargo | 5,871 | 2-40N, 148-26E | United States | Submarine | Sunk | ||
| 27 | TEIKIN MARU | Cargo | 1,972 | 19-57N, 109-05E | United States | Navy Mine* | Sunk | ||
| 28 | TAMISKIMA MARU | Cargo | 1,931 | 13-52N, 97-50E | United States | Army Aircraft | Sunk | ||
| 30 | RYUZAN MARU | Cargo | 4,720 | 6-31S, 111-26E | United States | Submarine | Sunk | ||
| 25 Vessels | 84,361 | ||||||||
| August | 1 | 1943 | MOGAMIGAWA MARU | Aircraft Ferry | 7,497 | 11-16N, 153-34E | United States | Submarine | Sunk |
| 3 | KAISHO MARU | Passenger-Cargo | 6,070 | 5-18S, 111-52E | United States | Submarine | Sunk | ||
| 5 | SHOJU MARU | Passenger-Cargo | 2,022 | 24-37N, 152-45E | United States | Submarine | Sunk | ||
| 8 | TANGSHAN MARU | Cargo | 2,103 | 42-00N, 142-00E | Japan | Marine Casualty | Sunk | ||
| 8 | NARUTO MARU | Aircraft Ferry | 7,149 | 24-12N, 142-51E | United States | Submarine | Sunk | ||
| 9 | SEKKO MARU | Passenger-Cargo | 3,133 | 24-51N, 122-12E | United States | Submarine | Sunk | ||
| 10 | WAKANOURA MARU | Passenger-Cargo | 2,411 | 46-53N, 143-30E | United States | Submarine | Sunk | ||
| 13 | EDO MARU | Converted Gunboat | 1,299 | 23-24N, 142-26E | United States | Submarine | Sunk | ||
| 20 | CHOSA MARU | Converted Gunboat | 2,538 | 5-09N, 100-10E | Netherlands | Submarine | Sunk | ||
| 20 | NIKKYO MARU | Cargo | 5,434 | 34-14N, 136-39E | Japan | Marine Casualty | Sunk | ||
| 20 | SEITAI MARU | Cargo | 3,404 | 42-15N, 139-53E | United States | Submarine | Sunk | ||
| 20 | SEIZAN MARU | Cargo | 955 | 00-53N, 119-01E | United States | Submarine | Sunk | ||
| 22 | GLASGOW MARU | Cargo | 5,831 | Indian Ocean | Unknown | Unknown | Sunk | ||
| 22 | RYOKAI MARU | Cargo | 4,655 | 42-40N, 139-48E | United States | Submarine | Sunk | ||
| 22 | KAISHO MARU | Passenger-Cargo | 4,164 | 10-09N, 147-25S | United States | Submarine | Sunk | ||
| 22 | NISHIYAMA MARU | Cargo | 3,016 | 2-40N, 137-10E | United States | Submarine | Sunk | ||
| 23 | HEITO MARU | Cargo | 4,468 | 9-10N, 92-50E | United States | Army Aircraft | Sunk | ||
| 23 | ATAKA MARU | Passenger-Cargo | 5,248 | 34-37N, 137-53E | United States | Submarine | Sunk | ||
| 27 | MEIZAN MARU | Passenger-Cargo | 5,480 | 13-13N, 121-23E | United States | Submarine* | Sunk | ||
| 27 | TAIFUKU MARU | Passenger-Cargo | 3,520 | 32-27N, 132-24E | United States | Submarine | Sunk | ||
| 29 | CHOJUN MARU | Cargo | 2,246 | 34-23N, 128-55E | Japan | Marine Casualty | Sunk | ||
| 30 | TAIBUN MARU | Passenger-Cargo | 6,531 | 41-53N, 141-10E | United States | Submarine | Sunk | ||
| 31 | SHOTO MARU | Passenger-Cargo | 5,254 | 28-27N, 123-03E | United States | Submarine | Sunk | ||
| 31 | KOKKO MARU | Cargo | 5,486 | 28-27N, 123-03E | United States | Submarine | Sunk | ||
| 24 Vessels | 100,064 | ||||||||
| * Probable Agent | |||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| September | 1 | 1943 | FUSEI MARU | Passenger-Cargo | 2,256 | 31-28N, 127-24E | United States | Submarine | Sunk |
| 2 | BUSAN MARU | Cargo | 1,990 | 42-21N, 149-59E | Japan | Marine Casualty | Sunk | ||
| 2 | HANKOW MARU | Passenger-Cargo | 4,105 | 3-35S, 143-39E | United States | Army Aircraft | Sunk | ||
| 2 | NAGATO MARU | Cargo | 5,901 | 3-35S, 143-39E | United States | Army Aircraft | Sunk | ||
| 3 | AKAMA MARU | Cargo | 5,600 | 41-00N, 141-30E | United States | Submarine* | Sunk | ||
| 3 | TAGONOURA MARU | Cargo | 3,521 | 34-10N, 140-12E | United States | Submarine | Sunk | ||
| 4 | HEIJO MARU | Converted Gunboat | 2,627 | 5-32N, 156-23E | United States | Submarine | Sunk | ||
| 4 | KOZAN MARU | Passenger-Cargo | 4,180 | 22-22N, 120-04E | United States | Submarine | Sunk | ||
| 5 | TENKAI MARU | Cargo | 3,203 | 1-10N, 142-10E | United States | Submarine | Sunk | ||
| 6 | KOFUKU MARU | Cargo | 3,209 | 38-00N, 138-25E | Japan | Marine Casualty* | Sunk | ||
| 6 | ANNAN MARU | Cargo | 2,941 | 16-46N, 96-10E | United States | Army Aircraft | Sunk | ||
| 6 | MILAN MARU | Cargo | 5,467 | 16-46N, 96-10E | United States | Army Aircraft | Sunk | ||
| 6 | SHOGEN MARU | Cargo | 3,362 | 42-13N, 142-16E | United States | Submarine | Sunk | ||
| 8 | HAKUTETSU MARU NO 13 | Cargo | 1,334 | 2-44N, 141-36E | United States | Submarine | Sunk | ||
| 9 | KOYO MARU | Cargo | 3,010 | 35-20N, 140-40E | United States | Submarine* | Sunk | ||
| 9 | KOSHIN MARU | Cargo | 1,358 | 34-21N, 127-51E | Japan | Marine Casualty | Sunk | ||
| 11 | YOKO MARU | Cargo | 1,050 | 33-50N, 139-33E | United States | Submarine | Sunk | ||
| 11 | HOKUSHO MARU | Cargo | 4,211 | 00-28S, 166-52E | United States | Submarine | Sunk | ||
| 13 | YAMATO MARU | Transport | 9,656 | 30-06N, 123-332 | United States | Submarine | Sunk | ||
| 16 | SEIKAI MARU | Converted Gunboat | 2,663 | 2-30S, 150-48E | Australia | Mine | Sunk | ||
| 17 | TAMATSU MARU | Passenger-Cargo | 4,646 | 5-23N, 100-21E | Japan | Marine Casualty | Sunk | ||
| 18 | YOWA MARU | Cargo | 6,435 | 27-31N, 126-57E | United States | Submarine* | Sunk | ||
| 18 | KANSAI MARU | Passenger-Cargo | 8,614 | 00-25N, 146-21E | United States | Submarine | Sunk | ||
| 19 | KATSURA MARU NO 2 | Converted Gunboat | 1,368 | 49-05N, 151-45E | United States | Submarine | Sunk | ||
| 19 | KACHISAN MARU | Cargo | 814 | 33-30N, 135-40E | United States | Submarine | Sunk | ||
| 21 | SHIRIYA | Tanker | 6,500 | 26-27N, 122-40E | United States | Submarine | Sunk | ||
| 21 | SHOYO MARU | Tanker | 7,498 | 26-27N, 122-40E | United States | Submarine | Sunk | ||
| 21 | ARGUN MARU | Cargo | 6,662 | 26-27N., 122-40E | United States | Submarine | Sunk | ||
| 22 | HOKUSEI MARU | Cargo | 1,394 | Sea of Okhotsk | Unknown | Unknown | Sunk | ||
| 22 | KATSURAHAMA MARU | Cargo | 715 | 39-11N, 123-20E | United States | Submarine | Sunk | ||
| 23 | KOWA MARU | Cargo | 4,520 | 34-15N, 137-00E | United States | Submarine | Sunk | ||
| 23 | DAISHIN MARU | Tanker | 5,878 | 34-15N, 137-00E | United States | Submarine | Sunk | ||
| 23 | RYOTOKU MARU | Cargo | 3,483 | 21-17N, 142-00E | United States | Submarine | Sunk | ||
| 23 | YAMASHIRO MARU | Passenger-Cargo | 3,429 | 21-17N, 142-00E | United States | Submarine | Sunk | ||
| 24 | SHONAN MARU | Cargo | 521 | 00-27S, 147-43E | United States | Army Aircraft | Sunk | ||
| 25 | TAIKO MARU | Cargo | 2,958 | 41-30N, 139-00E | United States | Submarine* | Sunk | ||
| 25 | KIRISHIMA MARU | Passenger-Cargo | 8,120 | 9-44N, 111-56E | United States | Submarine | Sunk | ||
| 27 | TAISEI MARU | Cargo | 1,957 | 3-19S, 143-33E | United States | Army Aircraft | Sunk | ||
| 27 | HAKUSAN MARU | Cargo | 2,197 | 1-18N, 103-52E | Great Britain |
Sabotage | Sunk | ||
| 27 | KIZAN MARU | Cargo | 5,077 | 1-18N, 103-52E | Great Britain |
Sabotage | Sunk | ||
| 27 | KASHIMA MARU | Transport | 9,908 | 10-14N, 109-45E | United States | Submarine | Sunk | ||
| * Probable Agent | |||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| September | 28 | 1943 | AKASHI MARU | Cargo | 3,227 | 6-11S, 126-00E | United States | Submarine | Sunk |
| 28 | TAIAN MARU | Passenger-Cargo | 3,158 | 15-22N, 145-38E | United States | Submarine | Sunk | ||
| 29 | MASAKI MARU NO 2 | Cargo | 1,238 | 40-00N, 130-00E | United States | Submarine* | Sunk * | ||
| 30 | MAEBASHI MARU | Passenger-Cargo | 7,005 | 6-01N, 139-08E | United States | Submarine | Sunk | ||
| 45 Vessels | 178,966 | ||||||||
| October | 1 | 1943 | TONEI MARU | Passenger-Cargo | 4,930 | 4-01N, 143-47E | United States | Submarine | Sunk |
| 1 | KINKASAN MARU | Cargo | 4,980 | 4-01N, 143-47E | United States | Submarine | Sunk | ||
| 5 | KONRON MARU | Transport | 7,908 | 34-00N, 130-00E | United States | Submarine | Sunk | ||
| 6 | KAZAHAYA | Tanker | 8,000e | 10-01N, 148-31E | United States | Submarine | Sunk | ||
| 6 | KANKO MARU | Passenger-Cargo | 1,288 | 37-18N, 129-33E | United States | Submarine* | Sunk | ||
| 6 | SHINYU MARU | Cargo | 529 | 3-35S, 143-36E | United States | Army Aircraft | Sunk | ||
| 7 | KIKUKAWA MARU | Passenger-Cargo | 3,833 | 7-22N, 151-54E | Japan | Marine Casualty | Sunk | ||
| 8 | TAIAN MARU | Cargo | 5,655 | 18-24N, 119-09E | United States | Submarine | Sunk | ||
| 8 | DAINICHI MARU | Passenger-Cargo | 5,813 | 18-24N, 119-09E | United States | Submarine | Sunk | ||
| 8 | KASHU MARU | Cargo | 5,460 | 00-25S, 146-22E | United States | Submarine | Sunk | ||
| 9 | KANKO MARU | Cargo | 2,995 | 37-18N, 129-33E | United States | Submarine* | Sunk | ||
| 9 | KOGANE MARU | Passenger-Cargo | 3,132 | 3-36S, 127-44E | United States | Submarine | Sunk | ||
| 10 | HINO MARU NO 5 | Cargo | 2,725 | 5-35S, 154-25E | United States | Army Aircraft | Sunk | ||
| 10 | TEIBI MARU | Transport | 10,086 | 14-44N, 110-19E | United States | Submarine | Sunk | ||
| 10 | ISUZUGAWA MARU | Cargo | 4,212 | 14-44N, 110-19E | United States | Submarine | Sunk | ||
| 11 | SANWA MARU | Cargo | 547 | 5-30S, 154-45E | United States | Army Aircraft | Sunk | ||
| 12 | KEISHO MARU | Passenger-Cargo | 5,879 | 4-13S, 152-12E | United States | Army Aircraft | Sunk | ||
| 12 | TSUKINADA MARU | Passenger-Cargo | 530 | 4-13S, 152-11E | United States | Army Aircraft | Sunk | ||
| 13 | DAIGEN MARU NO 8 | Cargo | 1,365 | 24-28N, 118-04E | United States | Army Aircraft | Sunk | ||
| 13 | KENKOKU MARU | Cargo | 3,127 | 3-47S, 127-41E | United States | Submarine | Sunk | ||
| 14 | KOZUI MARU | Passenger-Cargo | 7,072 | 27-35N, 127-27E | United States | Submarine | Sunk | ||
| 15 | CHICAGO MARU | Passenger-Cargo | 5,866 | 24-35N, 120-31E | United States | Submarine | Sunk | ||
| 18 | TAICHU MARU | Cargo | 1,906 | 34-00N, 136-24E | United States | Submarine | Sunk | ||
| 18 | TAIRIN MARU | Cargo | 1,915 | 1-00N, 143-16E | United States | Submarine | Sunk | ||
| 20 | SANA MARU | Cargo | 3,365 | 12-36N, 109-30E | United States | Submarine | Sunk | ||
| 22 | AWATA MARU | Converted Light Cruiser | 7,397 | 26-48N, 124-56E | United States | Submarine | Sunk | ||
| 24 | TENNAN MARU | Cargo | 5,407 | 2-05N, 144-39E | United States | Submarine | Sunk | ||
| 24 | KAZAN MARU | Cargo | 1,893 | 2-05N, 144-39E | United States | Submarine | Sunk | ||
| 24 | JOHORE MARU | Passenger-Cargo | 6,182 | 2-05N, 144-39E | United States | Submarine | Sunk | ||
| 26 | DOVER MARU | Cargo | 3,212 | 16-16N, 96-18E | United States | Army Aircraft | Sunk | ||
| 26 | HOKUZAN MARU | Cargo | 1,329 | 20-05N, 110-25E | United States | Army Aircraft | Sunk | ||
| 26 | YAMATOGAWA MARU | Cargo | 776 | 20-05N, 110-25E | United States | Army Aircraft | Sunk | ||
| 26 | SHOZAN MARU | Cargo | 2,937 | 20-52N, 106-40E | United States | Army Mine | Sunk | ||
| 27 | FUJI MARU | Transport | 9,138 | 28-25N, 128-04E | United States | Submarine | Sunk | ||
| 27 | NANMAN MARU | Cargo | 6,550 | 12-34N, 134-48E | United States | Submarine | Sunk | ||
| * Probable Agent | |||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| October | 29 | 1943 | WUHU MARU | Cargo | 3,222 | 22-30N, 115-25E | United States | Submarine | Sunk |
| 30 | SHINYO MARU NO 2 | Cargo | 1,085 | 41-52N, 140-07E | Japan | Marine Casualty | Sunk | ||
| 30 | SHANGHAI MARU | Transport | 5,258 | 32-00N, 125-00E | Japan | Marine Casualty | Sunk | ||
| 31 | KORYO MARU | Tanker | 589 | 1-25N, 120-46E | United States | Submarine | Sunk | ||
| 39 Vessels | 158,093 | ||||||||
| November | 2 | CHIHAYA MARU | Cargo | 7,089 | 28-37N, 134-47E | United States | Submarine* | Sunk | |
| 2 | UME MARU | Passenger-Cargo | 5,859 | 28-37N, 134-45E | United States | Submarine* | Sunk | ||
| 2 | YAWATA MARU | Cargo | 1,852 | 28-49N, 134-50E | United States | Submarine* | Sunk | ||
| 2 | DELAGOA MARU | Passenger-Cargo | 7,148 | 28-55N, 134-43E | United States | Submarine* | Sunk | ||
| 2 | MANKO MARU | Cargo | 1,503 | 4-15S, 152-10E | United States | Army Aircraft | Sunk | ||
| 2 | SHINKO MARU | Cargo | 3,119 | 4-13S, 152-11E | United States | Army Aircraft | Sunk | ||
| 2 | EHIME MARU | Cargo | 4,653 | 28-18N, 134-48E | United States | Submarine | Sunk | ||
| 3 | MINATO MARU | Cargo | 664 | 00-43N, 169-10E | United States | Navy Land-Based Aircraft | Sunk | ||
| 4 | CHINKO MARU | Passenger-Cargo | 3,222 | 23-20N, 116-45E | United States | Army Aircraft | Sunk | ||
| 4 | RYUOSAN MARU | Cargo | 2,455 | 2-40S, 150-40E | Australia | Mine | Sunk | ||
| 4 | KAIFUKU MARU | Passenger-Cargo | 3,177 | 21-22N, 113-20E | United States | Submarine | Sunk | ||
| 6 | ASAYAMA MARU | Converted Water Carrier | 1,917 | 5-44S, 154-45E | United States | Army Aircraft | Sunk | ||
| 6 | UJIGAWA MARU | Cargo | 782 | 5-16N, 154-33E | United States | Army Aircraft | Sunk | ||
| 7 | INUSHIMA MARU NO 6 | Cargo | 586 | 24-28N, 118-04E | United States | Army Aircraft | Sunk | ||
| 7 | NAGATA MARU | Cargo | 670 | 24-28N, 118-04E | United States | Army Aircraft | Sunk | ||
| 8 | KYOKUEI MARU | Tanker | 10,570 | 16-44N, 116-22E | United States | Submarine | Sunk | ||
| 8 | TANGO MARU | Tanker | 2,046 | 00-22N, 119-44E | United States | Submarine | Sunk | ||
| 9 | TAGA MARU | Cargo | 2,868 | 21-38N, 131-19E | United States | Submarine | Sunk | ||
| 10 | KISOGAWA MARU | Converted Water Carrier | 1,914 | 6-12N, 99-25E | Great Britain |
Submarine | Sunk | ||
| 10 | GIYU MARU | Cargo | 877 | 5-30S, 154-45E | United States | Army Aircraft | Sunk | ||
| 10 | TOKYO MARU | Passenger-Cargo | 6,486 | 3-36N, 150-34E | United States | Submarine | Sunk | ||
| 11 | KUNITAMA MARU | Cargo | 3,127 | 3-08S, 127-38E | United States | Submarine | Sunk | ||
| 11 | KOSEI MARU | Passenger-Cargo | 3,551 | 27-36N, 130-32E | United States | Submarine | Sunk | ||
| 13 | KYOKUYO MARU | Tanker | 17,548 | East China Sea | Unknown | Unknown | Sunk | ||
| 13 | TANGO MARU | Passenger-Cargo | 6,893 | East China Sea | Unknown | Unknown | Sunk | ||
| 13 | NACHISAN MARU | Passenger-Cargo | 4,433 | 32-57N, 125-06E | United States | Submarine | Sunk | ||
| 13 | MUKO MARU | Transport | 4,862 | 8-57N, 152-36E | United States | Submarine | Sunk | ||
| 15 | KYOKKO MARU | Passenger-Cargo | 6,783 | 14-53N, 119-54E | United States | Submarine | Sunk | ||
| 16 | KYORITSU MARU NO 2 | Cargo | 830 | 3-25S, 145-30E | United States | Army Aircraft | Sunk | ||
| 16 | TETSUWA MARU | Cargo | 1,951 | 23-42N, 117-35E | United States | Army Aircraft | Sunk | ||
| 17 | HIE MARU | Converted Submarine Tender | 11,621 | 1-48N, 148-24E | United States | Submarine | Sunk | ||
| 19 | DAIGEN MARU | Cargo | 1,517 | 19-54N, 110-10E | United States | Army Aircraft | Probably sunk | ||
| 19 | UDO MARU | Cargo | 3,936 | 22-27N, 147-15E | United States | Submarine | Sunk | ||
| * Probable Agent | |||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| November | 19 | 1943 | HOKKO MARU | Cargo | 5,385 | 22-27N, 147-15E | United States | Submarine | Sunk |
| 20 | NAPLES MARU | Cargo | 5,824 | 3-22S, 151-45E | United States | Navy Land-Based Aircraft | Sunk | ||
| 20 | NIKKO MARU | Cargo | 5,949 | 22-47N, 147-20E | United States | Submarine | Sunk | ||
| 21 | EIZAN MARU | Cargo | 1,681 | 36-40N, 125-31E | United States | Submarine* | Sunk | ||
| 21 | TAIKO MARU | Cargo | 1,812 | 21-17N, 136-30E | Japan | Marine Casualty | Sunk | ||
| 21 | NICHII MARU | Cargo | 6,550 | 2-00S, 149-15E | United States | Army Aircraft | Sunk | ||
| 21 | SHINWA MARU | Cargo | 3,328 | 2-24S, 134-36E | United States | Army Aircraft | Sunk | ||
| 22 | KANAYAMASAN MARU | Cargo | 2,869 | 1-00N, 149-00E | United States | Army Aircraft | Sunk | ||
| 22 | YAMATO MARU | Cargo | 4,379 | 7-09N, 134-34E | United States | Submarine | Sunk | ||
| 22 | DAISHU MARU | Cargo | 3,322 | 33-36N, 128-35E | United States | Submarine | Sunk | ||
| 22 | KISO MARU | Cargo | 4,071 | 7-09N, 134-34E | United States | Submarine | Sunk | ||
| 23 | KIZAN MARU | Cargo | 2,841 | 1-50N, 127-55E | United States | Army Aircraft | Sunk | ||
| 23 | NEKKA MARU | Transport | 6,784 | 28-49N, 122-11E | United States | Submarine | Sunk | ||
| 25 | KENZAN MARU | Cargo | 4,705 | 00-51N, 145-56E | United States | Submarine | Sunk | ||
| 25 | TOA MARU | Tanker | 10,052 | 8-20N, 158-00E | United States | Submarine | Sunk | ||
| 26 | OGURASAN MARU | Tanker | 5,069 | 12-48N, 109-34E | United States | Submarine | Sunk | ||
| 26 | TAINAN MARU | Cargo | 5,407 | 13-02N, 109-28E | United States | Submarine | Sunk | ||
| 26 | ONOE MARU | Cargo | 6,667 | 00-40N, 148-14E | United States | Submarine | Sunk | ||
| 26 | NIKKAI MARU | Converted Gunboat | 2,562 | 4-00N, 147-50E | United States | Submarine | Sunk | ||
| 26 | UNKNOWN MARU | Cargo | 4,000e | 33-36N, 128-57E | United States | Submarine | Sunk | ||
| 26 | SHINI MARU | Cargo | 3,811 | 6-56N, 134-38E | United States | Submarine | Sunk | ||
| 27 | BERYL | Cargo | 671 | South China Sea | Unknown | Unknown | Sunk | ||
| 27 | BUENOS AIRES MARU | Cargo | 9,625 | 2-44S, 149-15E | United States | Unknown Aircraft | Sunk | ||
| 27 | HAKONE MARU | Passenger-Cargo | 10,420 | 25-20N, 120-00E | United States | Army Aircraft | Sunk | ||
| 27 | VAN VOLLENHOVEN | Cargo | 691 | 13-01N, 109-30E | United States | Submarine | Sunk | ||
| 27 | SAN RAMON MARU | Tanker | 7,309 | 33-38N, 129-05E | United States | Submarine | Sunk | ||
| 28 | SYDNEY MARU | Passenger-Cargo | 5,425 | 12-46N, 109-42E | United States | Submarine | Sunk | ||
| 28 | TONAN MARU | Tanker | 9,866 | 12-46N, 109-42E | United States | Submarine | Sunk | ||
| 28 | HOKKO MARU | Cargo | 5,347 | 1-40N, 141-45E | United States | Submarine | Sunk | ||
| 28 | YURI MARU | Cargo | 6,787 | 1-40N, 141-45E | United States | Submarine | Sunk | ||
| 29 | SUEZ MARU | Cargo | 4,646 | 6-22S, 116-35E | United States | Submarine | Sunk | ||
| 29 | KENRYU MARU | Cargo | 4,575 | 33-19N, 139-34E | United States | Submarine | Sunk | ||
| 29 | MANJU MARU | Cargo | 5,877 | 18-23N, 140-18E | United States | Submarine | Sunk | ||
| 29 | YAMAFUKU MARU | Passenger-Cargo | 4,928 | 18-37N, 139-45E | United States | Submarine | Sunk | ||
| 29 | SHIGANOURA MARU | Cargo | 3,512 | 18-38N, 139-35E | United States | Submarine | Sunk | ||
| 30 | COLUMBIA MARU | Passenger-Cargo | 5,618 | 1-56N, 147-23E | United States | Submarine | Sunk | ||
| 30 | SHOKO MARU | Cargo | 1,933 | 14-31N, 140-18E | United States | Submarine | Sunk | ||
| 70 Vessels | 320,807 | ||||||||
| * Probable Agent | |||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| December | 1 | 1943 | TEIREN MARU | Passenger-Cargo | 3,044 | 22-13N, 114-05E | United States | Army Aircraft | Sunk |
| 1 | NICHIRYO MARU | Passenger-Cargo | 2,721 | 1-31N, 120-513 | United States | Submarine | Sunk | ||
| 1 | KONEI MARU | Cargo | 2,345 | 1-02N, 146-42E | United States | Submarine | Sunk | ||
| 2 | HITORA MARU | Cargo | 3,513 | OFF JAPAN | Unknown | Unknown | Sunk | ||
| 2 | HIMALAYA MARU | Passenger-Cargo | 5,228 | 00-52S, 148-50E | United States | Army Aircraft | Sunk | ||
| 3 | ASSAM | Cargo | 1,668 | 18-51N, 95-17E | United States | Army Aircraft | Sunk | ||
| 3 | AZUMA MARU | Passenger-Cargo | 6,646 | 6-29N, 131-28E | United States | Submarine | Sunk | ||
| 4 | HIYOSHI MARU | Passenger-Cargo | 4,046 | 29-45N, 145-55E | United States | Submarine | Sunk | ||
| 4 | DAIDO MARU | Converted Gunboat | 2,962 | 8-15N, 159-06E | United States | Submarine | Sunk | ||
| 5 | ASAKAZE MARU | Passenger-Cargo | 6,517 | 9-19N, 167-25E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 5 | CHOKO MARU | Cargo | 3,515 | 9-19N, 167-25E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 5 | TATEBU MARU | Cargo | 6,816 | 9-19N, 167-25E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 5 | TATEYAMA MARU | Converted Water Carrier | 3,787 | 9-19N, 167-25E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 5 | HIMENO MARU | Cargo | 834 | 9-10N, 124-30E | United States | Submarine | Sunk | ||
| 7 | OTORI MARU | Cargo | 2,559 | 38-43N, 125-24E | Japan | Marine Casualty | Sunk | ||
| 7 | SOYO MARU | Converted Submarine Tender | 6,081 | 14-04N, 152-09E | United States | Submarine | Sunk | ||
| 8 | SANSEI MARU | Passenger-Cargo | 3,267 | 25-20N, 141-46E | United States | Submarine | Sunk | ||
| 9 | HIGARI MARU | Cargo | 878 | 38-44N, 125-24E | Japan | Marine Casualty | Sunk | ||
| 12 | TOSEI MARU | Cargo | 5,484 | 2-44N, 126-14E | United States | Submarine | Sunk | ||
| 13 | TOKIWA MARU | Cargo | 1,203 | 3-30S, 151-30E | United States | Navy Land-Based Aircraft | Sunk | ||
| 13 | FUKKAI MARU | Passenger-Cargo | 3,829 | 7-07N, 134-31E | United States | Submarine | Sunk | ||
| 13 | TOTAI MARU | Cargo | 3,195 | 30-55N, 132-33E | United States | Submarine | Sunk | ||
| 14 | HAKOZAKI MARU | Passenger-Cargo | 3,948 | 33-10N, 125-55E | United States | Submarine | Sunk | ||
| 16 | WAKATSU MARU | Cargo | 5,123 | 8-26S, 126-48E | Netherlands | Aircraft | Sunk | ||
| 16 | GENMEI MARU | Cargo | 3,180 | 8-26S, 126-48E | Australia | Aircraft | Sunk | ||
| 16 | GINYO MARU | Cargo | 8,613 | 22-27N, 120-08E | United States | Submarine | Sunk | ||
| 18 | GYOKUREI MARU | Cargo | 5,588 | 26-22N, 128-20E | United States | Submarine | Sunk | ||
| 19 | KAITO MARU | Cargo | 2,745 | 3-05S, 151-15E | United States | Army Aircraft | Sunk | ||
| 19 | ALASKA MARU | Cargo | 7,378 | 2-37S, 150-52E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 20 | SHOEI MARU | Cargo | 3,083 | 8-42N, 167-44E | United States | Navy Land-Based Aircraft | Sunk | ||
| 20 | TSUNESHIMA MARU | Cargo | 2,926 | 1-30N, 148-36E | United States | Submarine | Sunk | ||
| 21 | UYO MARU | Cargo | 6,376 | 32-38N, 132-04E | United States | Submarine | Sunk | ||
| 21 | TERUKAWA MARU | Cargo | 6,429 | 9-50N, 151-55E | United States | Submarine | Sunk | ||
| 21 | KONAN MARU | Cargo | 2,627 | 30-24N, 129-53E | United States | Submarine | Sunk | ||
| 21 | KASHIWA MARU | Converted Net Tender | 515 | 30-24N, 129-53E | United States | Submarine | Sunk | ||
| 22 | GINREI MARU | Passenger-Cargo | 5,949 | 20-12N, 113-42E | China | Aircraft | Sunk | ||
| 23 | MANKAI MARU NO 2 | Cargo | 1,960 | 6-05N, 171-43E | United States | Army Aircraft Navy Carrier- Based Aircraft |
Sunk | ||
| Date | Name of Vessel | Type of Vessel | Tonnage | Location | Flag of Agent |
Type of Agent | Assessment | |||
| December | 24 | 1943 | SEIZAN MARU NO 2 | Cargo | 1,898 | 34-02N, 136-19E | United States | Submarine | Sunk | |
| 24 | TOFUKU MARU | Cargo | 5,857 | 33-58N, 136-16E | United States | Submarine | Sunk | |||
| 24 | HEIWA MARU | Cargo | 5,578 | 2-45N, 127-41E | United States | Submarine | Sunk | |||
| 25 | TENRYU MARU | Cargo | 4,861 | 2-36S, 150-49E | United States | Navy Carrier Based Aircraft | Sunk | |||
| 27 | KYUEI MARU | Tanker | 10,171 | 21-42N, 118-05E | United States | Submarine | Sunk | |||
| 27 | KYOKO MARU | Tanker | 5,792 | 5-00S, 121-22E | United States | Submarine | Sunk | |||
| 28 | HEIZAN MARU | Passenger-Cargo | 1,061 | 30-31N, 117-02E | United States | Army Aircraft | Sunk | |||
| 28 | UNTO MARU | Passenger-Cargo | 1,037 | 30-31N, 117-02E | United States | Army Aircraft | Sunk | |||
| 29 | BICHU MARU | Cargo | 4,667 | Off New Guinea | Unknown | Unknown | Sunk | |||
| 29 | DAITEI MARU | Passenger-Cargo | 2,421 | 30-31N, 117-02E | United States | Army Aircraft | Sunk | |||
| 29 | KAKUZAN MARU | Cargo | 2,938 | 30-31N, 117-02E | United States | Army Aircraft | Sunk | |||
| 29 | TENPOSAN MARU | Cargo | 1,970 | 8-00N, 133-51E | United States | Submarine | Sunk | |||
| 29 | SHICHISEI MARU | Cargo | 1,911 | 8-03N, 134-04E | United States | Submarine | Sunk | |||
| 29 | RYUTO MARU | Cargo | 3,311 | 8-00N, 133-51E | United States | Submarine | Sunk | |||
| 30 | ICHIYU MARU | Tanker | 5,061 | 2-45S, 109-10E | United States | Submarine | Sunk | |||
| 31 | SHOHO MARU | Cargo | 1.936 | 5-18N, 160-16E | United States | Submarine | Sunk | |||
| 53 Vessels | 207,048 | |||||||||
| January | 1 | 1944 | KANAIYAMA MARU | Cargo | 543 | 2-03S, 147-27E | United States | Navy Land-Based Aircraft | Sunk | |
| 1 | RYUYO MARU | Cargo | 6,707 | 8-24N, 122-56E | United States | Submarine | Sunk | |||
| 1 | OKUYO MARU | Converted Gunboat | 2,904 | 3-51S, 128-04E | United States | Submarine | Sunk | |||
| 1 | NAGOYA MARU | Aircraft Ferry | 6,072 | 32-10N, 138-37E | United States | Submarine | Sunk | |||
| 2 | ISSHIN MARU | Tanker | 10,000e | 29-30N, 128-50E | United States | Submarine | Sunk | |||
| 3 | SAISHU MARU | Cargo | 2,082 | 33-44N, 136-02E | United States | Submarine | Sunk | |||
| 3 | RYUEI MARU | Tanker | 5,144 | 8-06N, 112-30E | United States | Submarine | Sunk | |||
| 3 | BOKUEI MARU | Tanker | 5,135 | 6-58N, 112-02E | United States | Submarine | Sunk | |||
| 4 | HEIMEI MARU | Cargo | 4,364 | 10-10S, 123-35E | United States | Army Aircraft | Sunk | |||
| 4 | KIYO MARU | Tanker | 7,251 | 5-46N, 108-36E | United States | Submarine | Sunk | |||
| 4 | USA MARU | Cargo | 3,943 | 34-09N, 136-50E | United States | Submarine | Sunk | |||
| 4 | HAKKO MARU | Tanker | 6,046 | 7-10N, 108-25E | United States | Submarine | Sunk | |||
| 4 | TAMON MARU NO 8 | Cargo | 2,705 | 11-05N, 109-10E | United States | Submarine | Sunk | |||
| 7 | KATSURAGISAN MARU | Cargo | 2,427 | 7-30N, 151-50E | Japan | Mine | Sunk | |||
| 7 | FUSHIMI MARU NO 3 | Tanker | 4,292 | 9-27N, 117-36E | United States | Submarine | Sunk | |||
| 10 | YAMABIKO MARU | Converted Salvage Vessel | 6,795 | 31-28N, 137-44E | United States | Submarine | Sunk | |||
| 10 | GETSUYO MARU | Cargo | 6,440 | 27-22N, 127-31E | United States | Submarine | Sunk | |||
| 10 | ASUKA MARU | Cargo | 7,523 | 27-35N, 127-30E | United States | Submarine | Sunk | |||
| 11 | YAHIKO MARU | Cargo | 5,747 | 27-10N, 127-28E | United States | Submarine | Sunk | |||
| 11 | ERIE MARU | Cargo | 5,493 | 32-56N, 132-02E | United States | Submarine | Sunk | |||
| 12 | IKUTA MARU | Converted Gunboat | 2,969 | 8-42N, 167-44E | United States | Navy Land-Based Aircraft | Sunk | |||
| 12 | KANJO MARU | Cargo | 2,197 | 22-37N, 120-15E | United States | Army Mine | Sunk | |||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| January | 12 | 1944 | NIGITSU MARU | Transport | 9,547 | 23-15N, 133-49E | United States | Submarine | Sunk |
| 12 | CHOKO MARU | Converted Gunboat | 2,629 | 3-30N, 147-27E | United States | Submarine | Sunk | ||
| 13 | HAGURO MARU | Cargo | 3,352 | 2-43S, 149-25E | United States | Array Aircraft | Sunk | ||
| 14 | GYOEI MARU | Cargo | 2,790 | 20-35N, 113-44E | United States | Army Aircraft | Sunk | ||
| 14 | NIPPON MARU | Tanker | 9,975 | 5-02N, 140-43E | United States | Submarine | Sunk | ||
| 14 | YAMATSURU MARU | Cargo | 3,651 | 28-30N, 133-40E | United States | Submarine | Sunk | ||
| 14 | KENYO MARU | Tanker | 10,022 | 5-22N, 141-27E | United States | Submarine | Sunk | ||
| 14 | YAMAKUNI MARU | Passenger-Cargo | 6,921 | 33-16N, 139-30E | United States | Submarine | Sunk | ||
| 15 | RYUKO MARU | Passenger-Cargo | 2,962 | 10-00N, 93-00E | Great Britain |
Submarine | Sunk | ||
| 15 | TATSUNO MARU | Cargo | 6,960 | 19-45N, 120-40E | United States | Submarine | Sunk | ||
| 15 | TOHO MARU | Cargo | 4,092 | 19-45N, 120-40E | United States | Submarine | Sunk | ||
| 16 | HARUNA MARU | Cargo | 1,549 | 5-00N, 130-00E | Japan | Marine Casualty | Sunk | ||
| 16 | MEISHO MARU | Cargo | 2,735 | 2-20S, 149-42E | United States | Army Aircraft Navy Land-Based Aircraft | Sunk | ||
| 16 | HOZUGAWA MARU | Cargo | 1,925 | 2-20S, 149-42E | United States | Navy Land-Based Aircraft | Sunk | ||
| 16 | SHUNKO MARU | Cargo | 4,027 | 2-30S, 149-42E | United States | Navy Land-Based Aircraft | Sunk | ||
| 16 | NIKKO MARU | Cargo | 734 | 12-49N, 150-19E | United States | Submarine | Sunk | ||
| 16 | DENMARK MARU | Cargo | 5,870 | 23-09N, 135-14E | United States | Submarine | Sunk | ||
| 16 | DELHI MARU | Converted Gunboat | 2,182 | 34-04N, 139-56E | United States | Submarine | Sunk | ||
| 16 | KAIKA MARU | Cargo | 2,087 | 4-03N, 148-41E | United States | Submarine | Sunk | ||
| 17 | CHIBURI MARU | Cargo | 1,943 | 2-27S, 148-58E | United States | Army Aircraft | Sunk | ||
| 17 | FUKEI MARU NO 9 | Cargo | 617 | 2-00S, 149-00E | United States | Army Aircraft | Sunk | ||
| 17 | HAKKAI MARU | Converted Salvage Vessel | 5,114 | 4-13S, 152-12E | United States | Navy Land-Based Aircraft | Sunk | ||
| 17 | KENSHIN MARU | Cargo | 3,126 | 4-13S, 152-12E | United States | Navy Land-Based Aircraft | Sunk | ||
| 17 | KOSEI MARU | Cargo | 1,920 | 4-13S, 152-12E | United States | Navy Land-Based Aircraft | Sunk | ||
| 17 | LYONS MARU | Cargo | 7,017 | 4-13S, 152-12E | United States | Navy Land-Based Aircraft | Sunk | ||
| 17 | TENSHIN MARU | Cargo | 1,500 | 4-13S, 152-12E | United States | Navy Land-Based Aircraft | Sunk | ||
| 17 | SHOYU MARU | Cargo | 4,408 | 00-18N, 118-37E | United States | Submarine | Sunk | ||
| 17 | TARUSHIMA MARU | Cargo | 4,865 | 22-45N, 135-00E | United States | Submarine | Sunk | ||
| 18 | YOSHIDA MARU | Converted Gunboat | 2,900 | 23-50N, 151-28E | United States | Submarine | Sunk | ||
| 20 | SANYU MARU | Cargo | 530 | 13-00N, 121-00E | Japan | Marine Casualty | Sunk | ||
| 20 | JINTSU MARU | Dredge | 558 | 3-04S, 142-10E | United States | Army Aircraft | Sunk | ||
| 20 | MENADO MARU | Cargo | 2,166 | 23-10N, 118-15E | United States | Army Aircraft | Sunk | ||
| 20 | KUZAN MARU | Cargo | l,000e | 22-10N, 118-15E | United States | Army Aircraft | Sunk | ||
| 20 | KOYU MARU | Cargo | 5,325 | 6-40N, 134-17E | United States | Submarine | Sunk | ||
| 20 | HIDAKA MARU | Cargo | 5,486 | 31-28N, 134-52E | United States | Submarine | Sunk | ||
| 21 | YASUKUNI MARU | Cargo | 3,025 | 3-19N, 137-02E | United States | Submarine | Sunk | ||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| January | 21 | 1944 | IKOMA MARU | Passenger-Cargo | 3,156 | 3-19N, 137-02E | United States | Submarine | Sunk |
| 22 | KOSHIN MARU | Passenger-Cargo | 5,485 | 7-22N, 115-05E | United States | Submarine | Sunk | ||
| 22 | SEINAN MARU | Cargo | 5,401 | 7-22N, 115-05E | United States | Submarine | Sunk | ||
| 23 | SEIKAI MARU | Cargo | 3,180 | 12-26N, 98-36E | United States | Army Aircraft | Sunk | ||
| 23 | PANAMA MARU | Cargo | 5,287 | 27-08N, 120-30E | China | Aircraft | Sunk | ||
| 23 | TAIAN MARU | Cargo | 3,670 | 5-45N, 134-45E | United States | Submarine | Sunk | ||
| 23 | MAGANE MARU | Converted Gunboat | 3,120 | 29-49N, 140-07E | United States | Submarine | Sunk | ||
| 24 | LIU HSING | Cargo | 1,076 | 26-58N, 120-04E | United States | Army Aircraft | Sunk | ||
| 24 | UNKNOWN MARU | Cargo | 1,000e | 26-58N, 120-04E | United States | Army Aircraft | Sunk | ||
| 24 | UNKNOWN MARU | Cargo | 1,000e | 26-58N, 120-04E | United States | Army Aircraft | Sunk | ||
| 24 | KOAN MARU | Converted Water Carrier | 3,462 | 4-13S, 152-11E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 24 | OGASHIMA MARU | Cargo | 1,424 | 8-14N, 168-02E | United States | Navy Land-Based Aircraft | Sunk | ||
| 24 | NARUTO | Tanker | 6,500 | 4-13S, 152-11E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 24 | TAISHO MARU | Cargo | 4,815 | 4-13S, 152-11E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 24 | YAMAYURI MARU | Cargo | 5,028 | 4-13S, 152-11E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 24 | CHOSEN MARU | Cargo | 3,110 | 32-255, 133-00E | United States | Submarine | Sunk | ||
| 24 | HARAJI MARU | Converted Minesweeper | 500 | 21-33N, 112-00E | United States | Army Aircraft* | Probably sunk | ||
| 25 | NANSHIN MARU | Cargo | 1,391 | 35-31N, 133-09E | Japan | Marine Casualty | Sunk | ||
| 26 | OKITSU MARU | Converted Seaplane Tender | 6,666 | 9-22N, 157-26E | United States | Submarine | Sunk | ||
| 26 | BUSHO MARU | Converted Gunboat | 2,552 | 8-27N, 109-12E | United States | Submarine | Sunk | ||
| 27 | KASAGI MARU | Converted Salvage Vessel | 3,140 | 33-31N, 139-36E | United States | Submarine | Sunk | ||
| 27 | KIKUZUKI MARU | Cargo | 1,266 | 22-11N, 119-12E | United States | Submarine | Sunk | ||
| 27 | KOSEI MARU | Cargo | 2,205 | 22-11N, 119-12E | United States | Submarine | Sunk | ||
| 28 | NEIKAI MARU | Cargo | 2,827 | 3-45S, 150-38E | United States | Army Aircraft | Sunk | ||
| 28 | UJI MARU | Converted Net Tender | 872 | 9-20N, 167-28E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 29 | SHUNTAI MARU | Cargo | 2,253 | 27-22N, 128-29E | United States | Submarine | Sunk | ||
| 29 | SHUKO MARU | Converted Net Tender | 889 | 23-07N, 142-27E | United States | Submarine | Sunk | ||
| 30 | EIKO MARU | Cargo | 3,535 | 9-10N, 167-20E | United States | Surface Craft | Sunk | ||
| 30 | TOKIHIME MARU | Cargo | 741 | 4-10S, 144-51E | United States | Army Aircraft | Sunk | ||
| 30 | AKIBASAN MARU | Cargo | 4,603 | 8-42N, 167-44E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | IWATE MARU | Converted Water Carrier | 2,984 | 4-12S, 152-12E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | KATSURA MARU | Converted Net Tender | 540 | 11-32N, 162-22E | United States | Navy Carrier- Based Aircraft Navy Surface Craft |
Sunk | ||
| * Probable Agent | |||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| January | 30 | 1944 | PARAN MARU | Cargo | 562 | 8-42N, 167-44E | United States | Navy Carrier-Based Aircraft Navy Surface Craft |
Probably sunk |
| 30 | TOKO MARU | Passenger-Cargo | 2,747 | 6-10N, 138-14E | United States | Submarine | Sunk | ||
| 30 | TAMASHIMA MARU | Passenger-Cargo | 3,560 | 21-15N, 149-18E | United States | Submarine | Sunk | ||
| 31 | YASUKUNI MARU | Converted Submarine Tender | 11,933 | 9-21N, 147-02E | United States | Submarine | Sunk | ||
| 31 | HIRO MARU | Converted Net Tender | 549 | 15-23N, 145-35E | United States | Submarine | Sunk | ||
| 95 Vessels | 355,368 | ||||||||
| February | 1 | 1944 | TOEI MARU | Cargo | 4,004 | 4-21N, 143-16E | United States | Submarine | Sunk |
| 1 | TACOMA MARU | Passenger-Cargo | 5,772 | 1-35N, 128-58E | United States | Submarine | Sunk | ||
| 1 | NANKA MARU | Cargo | 4,065 | 1-35N, 128-58E | United States | Submarine | Sunk | ||
| 2 | TOYO MARU NO 5 | Cargo | 2,193 | 33-32N, 135-58E | United States | Submarine | Sunk | ||
| 2 | TOYO MARU NO 8 | Cargo | 2,191 | 33-32N, 135-58E | United States | Submarine | Sunk | ||
| 3 | NICHIAI MARU | Cargo | 5,439 | 3-00S, 150-10E | United States | Army Aircraft Navy Carrier- Based Aircraft |
Sunk | ||
| 3 | ARIAKE MARU | Cargo | 5,000 | 29-11N, 124-45E | United States | Submarine | Sunk | ||
| 3 | GOYO MARU | Tanker | 8,496 | 29-11N, 124-45E | United States | Submarine | Sunk | ||
| 4 | GORYU MARU | Converted Water Carrier | 1,912 | 6-00N, 169-44E | United States | Navy Land-Based Aircraft | Sunk | ||
| 5 | SEIKYO MARU | Passenger-Cargo | 2,565 | 22-00N, 116-00E | United States | Army Aircraft | Sunk | ||
| 5 | LUSHAN MARU | Cargo | 2,531 | 22-00N, 116-00E | United States | Army Aircraft | Sunk | ||
| 5 | TATSUMI MARU | Cargo | 850 | 3-21S, 143-33E | United States | Army Aircraft | Sunk | ||
| 5 | SUZAN MARU | Passenger-Cargo | 2,539 | 22-00N, 116-00E | United States | Army Aircraft | Sunk | ||
| 5 | TAISHIN MARU | Cargo | 1,723 | 13-09N, 120-24E | United States | Submarine | Sunk | ||
| 8 | LIMA MARU | Cargo | 6,989 | 32-18N, 129-20E | United States | Submarine | Sunk | ||
| 10 | MALTA MARU | Passenger-Cargo | 5,500 | 23-12N, 121-30E | United States | Submarine | Sunk | ||
| 11 | SATSUMA MARU | Passenger-Cargo | 3,091 | 28-01N, 121-30E | China | Aircraft | Sunk | ||
| 12 | CHOKO MARU | Converted Net Tender | 889 | 5-45N, 99-50E | Great Britain |
Submarine | Sunk | ||
| 12 | RONSAN MARU | Passenger-Cargo | 2,735 | 27-43N, 128-35E | United States | Submarine | Sunk | ||
| 13 | URASHIO MARU | Cargo | 904 | 41-26N, 140-06E | Japan | Marine Casualty | Sunk | ||
| 13 | YOSHINO MARU | Cargo | 872 | 3-20S, 143-00E | United States | Army Aircraft | Sunk | ||
| 13 | SHOKA MARU | Cargo | 1,381 | 18-35N, 108-30E | United States | Army Aircraft | Sunk | ||
| 14 | DOZAN MARU | Cargo | 1,679 | 37-19N, 126-29E | Japan | Marine Casualty | Sunk | ||
| 14 | NITTOKU MARU | Cargo | 3,591 | 33-48N, 128-49E | United States | Submarine | Sunk | ||
| 14 | KINRYO MARU | Cargo | 2,193 | 13-44N, 120-40E | United States | Submarine | Sunk | ||
| 14 | HOKUAN MARU | Cargo | 3,712 | 13-40N, 120-27E | United States | Submarine | Sunk | ||
| 15 | MATSU MARU | Converted Net Tender | 509 | 2-36S, 150-36E | United States | Army Aircraft | Sunk | ||
| 15 | ODATSUKI MARU | Cargo | 1,988 | 10-03N, 126-54E | United States | Submarine | Sunk | ||
| 15 | HOSHI MARU NO 2 | Cargo | 875 | 34-23N, 128-12E | United States | Submarine | Sunk | ||
| 15 | RYOKA MARU | Passenger-Cargo | 5,307 | 31-16N, 121-45E | United States | Army Mine | Sunk | ||
| 16 | SANKO MARU | Tanker | 5,461 | 2-24S, 150-06E | United States | Army Aircraft | Sunk | ||
| 16 | CHOJO MARU | Transport | 2,610 | 9-15N, 127-05E | United States | Submarine | Sunk | ||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Vessel | Type of Vessel | Assessment | ||
| February | 17 | 1944 | KASHI MARU | Converted Net Tender | 540 | 2-24S, 150-06E | United States | Army Aircraft | Sunk |
| 17 | AIKOKU MARU | Converted Light Cruiser | 10,437 | 7-22N, 151-54E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | AKAGI MARU | Converted Light Cruiser | 7,389 | 7-54N, 151-25E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | AMAGISAN MARU | Passenger-Cargo | 7,620 | 7-18N, 151-53E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | FUJIKAWA MARU | Aircraft Ferry | 6,938 | 7-20N, 151-53E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | FUJISAN MARU | Tanker | 9,524 | 7-23N, 151-53E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | GOSEI MARU | Cargo | 1,931 | 7-18N, 151-53E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | HANAGAWA MARU | Tanker | 4,739 | 7-25N, 151-45E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | HEIAN MARU | Converted Submarine Tender | 11,614 | 7-23N, 151-51E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | HOKI MARU | Cargo | 7,112 | 7-22N, 151-45E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | HOKUYO MARU | Passenger-Cargo | 4,216 | 7-18N, 151-53E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | HOYO MARU | Tanker | 8,691 | 7-23N, 151-50E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | KENSHO MARU | Passenger-Cargo | 4,862 | 7-18N, 151-53E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | KIYOSUMI MARU | Converted Light Cruiser | 8,613 | 7-23N, 151-53E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | REIYO MARU | Cargo | 5,445 | 7-25N, 151-451 | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | RIO DE JANEIRO MARU | Converted Submarine Tender | 9,626 | 7-20N, 151-53E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | SAN FRANCISCO MARU | Passenger-Cargo | 5,831 | 7-22N, 151-54E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | SANKISAN MARU | Cargo | 4,776 | 7-25N, 151-45E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | SEIKO MARU | Cargo | 5,385 | 7-22N, 151-45E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | MOMOGAWA MARU | Passenger-Cargo | 3,829 | 7-20N, 151-53E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | NAGANO MARU | Passenger-Cargo | 3,824 | 7-25N, 151-45E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | NIPPO MARU | Converted Water Carrier | 3,763 | 7-18N, 151-53E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 17 | MATSUTAN MARU | Cargo | 1,999 | 7-23N, 151-05E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| February | 17 | 1944 | TONAN MARU NO 3 | Tanker | 19,209 | 7-23N, 151-51E | United States | Navy Carrier-Based Aircraft | Sunk |
| 17 | UNKAI MARU NO 6 | Cargo | 3,220 | 7-25N, 151-45E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 17 | YAMAGIRI MARU | Passenger-Cargo | 6,438 | 7-23N, 151-51E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 17 | YUBAE MARU | Cargo | 3,217 | 7-18N, 151-53E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 17 | ZUIKAI MARU | Cargo | 2,827 | 7-46N, 150-27E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 17 | TATSUHA MARU | Passenger-Cargo | 5,784 | 7-46N, 150-27E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 17 | SHINKOKU MARU | Tanker | 10,020 | 7-20N, 151-40E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 17 | TAIHO MARU | Cargo | 2,829 | 7-22N, 151-54E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 17 | NICHIRO MARU | Passenger-Cargo | 6,534 | 8-50N, 135-57E | United States | Submarine | Sunk | ||
| 17 | GYOTEN MARU | Cargo | 6,854 | 8-04N, 149-28E | United States | Submarine | Sunk | ||
| 18 | GOKENZAN MARU | Transport | 1,649 | 44-01N, 141-38E | Japan | Marine Casualty | Sunk | ||
| 18 | SHINSOKU MARU | Cargo | 3,202 | 28-21N, 121-51E | United States | Army Aircraft | Sunk | ||
| 19 | KOGEN MARU | Cargo | 2,965 | 35-00N, 140-00E | Japan | Marine Casualty | Sunk | ||
| 19 | NISSHIN MARU NO 3 | Cargo | 2,717 | 41-42N, 140-32E | Japan | Marine Casualty | Probably sunk | ||
| 19 | TATSUKIKU MARU | Cargo | 892 | 2-50S, 150-42E | United States | Army Aircraft | Sunk | ||
| 19 | SHINTO MARU NO 1 | Cargo | 1,934 | 2-50S, 150-42E | United States | Army Aircraft | Sunk | ||
| 19 | TAIRYU MARU | Cargo | 4,994 | 25-25N, 121-30E | United States | Army Aircraft | Sunk | ||
| 19 | KOKUEI MARU | Tanker | 5,154 | 14-34N, 114-11E | United States | Submarine | Sunk | ||
| 19 | NANEI MARU | Tanker | 5,019 | 14-34N, 114-11E | United States | Submarine | Sunk | ||
| 19 | NICHIRIN MARU | Tanker | 5,162 | 15-45N, 115-39E | United States | Submarine | Sunk | ||
| 19 | ICHIYO MARU | Tanker | 5,106 | 15-40N, 115-48E | United States | Submarine | Sunk | ||
| 19 | TAIKEI MARU | Cargo | 4,739 | 21-48N, 119-50E | United States | Submarine* | Sunk | ||
| 19 | TOSHIN MARU | Cargo | 1,917 | 21-46N, 120-06E | United States | Submarine* | Sunk | ||
| 20 | TAIJIN MARU | Cargo | 5,154 | 24-12N, 123-20E | United States | Submarine | Sunk | ||
| 20 | MANYO MARU | Cargo | 3,610 | 24-28N, 123-31E | United States | Submarine | Sunk | ||
| 21 | DAIGEN MARU NO 6 | Cargo | 510 | 3-15N, 100-40E | Great Britain |
Submarine | Sunk | ||
| 21 | KOKAI MARU | Cargo | 3,871 | 2-30S, 150-15E | United States | Army Aircraft | Sunk | ||
| 21 | KOWA MARU | Cargo | 1,106 | 2-30S, 150-15E | United States | Army Aircraft | Sunk | ||
| 22 | KYOSEI MARU | Cargo | 556 | 2-00S, 149-50E | United States | Surface Craft | Sunk | ||
| 22 | TEIKO MARU | Transport | 15,105 | 3-03N, 109-16E | United States | Submarine | Sunk | ||
| 22 | FUKUYAMA MARU | Passenger-Cargo | 3,581 | 14-47N, 144-50E | United States | Submarine | Sunk | ||
| 22 | TAISHO MARU | Cargo | 4,815 | 4-10S, 152-18E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 23 | GYOKO MARU | Passenger-Cargo | 5,342 | 26-13N, 127-40E | Japan | Marine Casualty | Sunk | ||
| * Probable Agent | |||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| February | 23 | 1944 | SEIZAN MARU | Passenger-Cargo | 4,232 | 15-00N, 145-30E | United States | Navy Carrier- Based Aircraft |
Sunk |
| 23 | KIMISHIMA MARU | Cargo | 5,193 | 30-30N, 140-20E | United States | Submarine | Sunk | ||
| 23 | HOREI MARU | Cargo | 5,588 | 26-22N, 126-15E | United States | Submarine | Sunk | ||
| 23 | KOYO MARU | Passenger-Cargo | 5,471 | 28-58N, 141-15E | United States | Submarine | Sunk | ||
| 23 | SHINYUBARI MARU | Cargo | 5,354 | 15-17N, 145-03E | United States | Submarine | Sunk | ||
| 23 | KUNISHIMA MARU | Cargo | 4,083 | 15-23N, 145-02E | United States | Submarine | Sunk | ||
| 23 | YAMASHIMO MARU | Cargo | 6,776 | 14-45N, 144-32E | United States | Submarine | Sunk | ||
| 23 | OGURA MARU NO 3 | Tanker | 7,350 | 3-53N, 129-17E | United States | Submarine | Sunk | ||
| 23 | NIKKI MARU | Passenger-Cargo | 5,857 | 00-07N, 135-42E | United States | Submarine | Sunk | ||
| 24 | SHUNSAN MARU NO 2 | Cargo | 608 | 5-20N, 162-58E | United States | Navy Land-Based Aircraft | Sunk | ||
| 24 | NAMPO MARU | Tanker | 10,033 | 24-20N, 122-25E | United States | Submarine | Sunk | ||
| 24 | ECHIZEN MARU | Cargo | 2,424 | 15-16N, 143-12E | United States | Submarine | Sunk | ||
| 25 | TANGO MARU | Cargo | 6,200 | 7-46S, 115-09E | United States | Submarine | Sunk | ||
| 25 | RYUSEI MARU | Passenger-Cargo | 4,797 | 7-56S, 115-14E | United States | Submarine | Sunk | ||
| 25 | CHOKO MARU | Cargo | 1,794 | 15-50N, 144-21E | United States | Submarine | Sunk | ||
| 25 | NISSHO MARU | Tanker | 10,526 | 5-55N, 126-05E | United States | Submarine | Sunk | ||
| 26 | DAIGEN MARU NO 3 | Passenger-Cargo | 5,256 | 00-55S, 139-62E | United States | Submarine | Sunk | ||
| 27 | TAISOKU MARU | Cargo | 2,473 | 1-48N, 127-32E | United States | Submarine | Sunk | ||
| 27 | CEYLON MARU | Cargo | 4,905 | 31-50N, 127-45E | United States | Submarine* | Sunk | ||
| 28 | AKIURA MARU | Passenger-Cargo | 6,803 | 00-06N, 132-53E | United States | Submarine | Sunk | ||
| 28 | KAIKO MARU | Cargo | 3,548 | 50-02N, 155-30E | United States | Submarine | Sunk | ||
| 28 | SHOHO MARU | Cargo | 2,723 | 00-06N, 132-53E | United States | Submarine | Sunk | ||
| 29 | UCHIDE MARU | Passenger-Cargo | 5,275 | 8-57N, 132-52E | United States | Submarine | Sunk | ||
| 29 | SAKITO MARU | Passenger-Cargo | 7,126 | 22-40N, 131-50E | United States | Submarine | Sunk | ||
| 112 Vessels | 518,697 | ||||||||
| March | 2 | 1944 | TENYO MARU NO 2 | Cargo | 657 | 50-12N, 155-45E | Japan | Marine Casualty | Sunk |
| 2 | SHINKYO MARU | Converted Gunboat | 2,672 | 6-25N, 148-31E | United States | Submarine | Sunk | ||
| 3 | NITTAI MARU | Cargo | 6,484 | 3-17N, 123-55E | United States | Submarine | Sunk | ||
| 3 | AKASHISAN MARU | Cargo | 4,541 | 45-52N, 149-16E | United States | Submarine | Sunk | ||
| 4 | ISEZAKI MARU | Cargo | 875 | 37-57N, 124-37E | Japan | Marine Casualty | Sunk | ||
| 4 | KAYO MARU | Passenger-Cargo | 4,368 | 1-28S, 138-40E | United States | Submarine | Sunk | ||
| 4 | OMINESAN MARU | Tanker | 10,536 | 5-32N, 109-09E | United States | Submarine | Sunk | ||
| 6 | AMERICA MARU | Transport | 6,070 | 21-50N, 143-54E | United States | Submarine | Sunk | ||
| 8 | SHOBU MARU | Cargo | 1,950 | 3-38N, 99-12E | Great Britain |
Submarine | Sunk | ||
| 8 | JUYO MARU | Cargo | 5,457 | 13-10N, 100-50E | United States | Army Mine | Sunk | ||
| 8 | TOYOKUNI MARU | Cargo | 5,792 | 19-23N, 116-13E | United States | Submarine | Sunk | ||
| 9 | NICHIREI MARU | Cargo | 5,396 | 19-47N, 116-13E | United States | Submarine | Sunk | ||
| 10 | HASSHU MARU | Cargo | 2,655 | 2-33S, 140-43E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| * Probable Agent | |||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| March | 10 | 1944 | TSUKIKAWA MARU | Cargo | 4,470 | 1-30S, 128-17E | United States | Submarine | Sunk |
| 11 | DAITOKU MARU | Cargo | 1,134 | 40-10N, 137-41E | Japan | Marine Casualty | Sunk | ||
| 12 | SHINYO MARU | Cargo | 700 | 42-00N, 142-00E | Japan | Marine Casualty | Sunk | ||
| 12 | OKINOYAMA MARU NO 3 | Cargo | 871 | 00-25S, 132-55E | United States | Submarine | Sunk | ||
| 12 | TAIJIN MARU | Cargo | 1,937 | 25-53N, 131-19E | United States | Submarine | Sunk | ||
| 13 | KOKUYO MARU | Cargo | 4,667 | 32-58N, 138-52E | United States | Submarine | Sunk | ||
| 13 | RYUA MARU | Cargo | 1,925 | 47-41N, 152-41E | United States | Submarine | Sunk | ||
| 13 | SHOJIN MARU | Cargo | 1,942 | 47-41N, 152-41E | United States | Submarine | Sunk | ||
| 14 | FUKI MARU | Cargo | 2,453 | 37-29N, 141-35E | Japan | Marine Casualty | Sunk | ||
| 16 | KOFUKU MARU | Cargo | 1,920 | 4-28N, 136-56E | United States | Submarine | Sunk | ||
| 16 | NICHIREN MARU | Passenger-Cargo | 5,460 | 42-25N, 144-55E | United States | Submarine | Sunk | ||
| 16 | ANZAN MARU | Passenger-Cargo | 5,493 | 27-41N, 128-41E | United States | Submarine | Sunk | ||
| 18 | HOKUROKU MARU | Passenger-Cargo | 8,359 | 19-22N, 116-52E | United States | Submarine | Sunk | ||
| 19 | YAKUMO MARU | Cargo | 3,198 | 2-55S, 143-40E | United States | Army Aircraft | Sunk | ||
| 19 | TAIEI MARU | Cargo | 3,221 | 2-55S, 143-40E | United States | Army Aircraft | Sunk | ||
| 20 | YAMABISHI MARU NO 2 | Cargo | 880 | 35-30N, 140-44E | Japan | Marine Casualty | Sunk | ||
| 20 | HAKUYO MARU | Cargo | 1,327 | 30-53N, 140-42E | United States | Submarine | Sunk | ||
| 20 | HOKO MARU | Cargo | 1,504 | 10-06N, 138-10E | United States | Submarine | Sunk | ||
| 21 | BRAKE | Tanker | 9,925 | Indian Ocean | Unknown | Unknown | Sunk | ||
| 23 | HOKKO MARU | Cargo | 4,470 | 35-42N, 140-53E | Japan | Marine Casualty | Sunk | ||
| 24 | SHINKYO MARU | Cargo | 5,139 | 5-27N, 125-38E | United States | Submarine | Sunk | ||
| 24 | BENGAL MARU | Cargo | 5,399 | 5-27N, 125-38E | United States | Submarine | Sunk | ||
| 25 | KAIRYU MARU | Cargo | 4,373 | 33-48N, 130-16E | Japan | Marine Casualty | Sunk | ||
| 27 | SHINSEI MARU | Cargo | 575 | 7-44S, 130-02E | Australia | Aircraft | Sunk | ||
| 27 | NICHINAN MARU | Cargo | 2,750 | 7-31S, 115-57E | United States | Submarine | Sunk | ||
| 27 | YAMAMIZU MARU | Tanker | 5,174 | 3-52S, 109-40E | United States | Submarine | Sunk | ||
| 28 | YASUSHIMA MARU | Cargo | 1,911 | 3-38N, 100-50E | Great Britain |
Submarine | Sunk | ||
| 28 | FUKUSEI MARU | Cargo | 2,219 | 24-25N, 131-11E | United States | Submarine | Sunk | ||
| 30 | MATSUEI MARU | Cargo | 1,877 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | URAKAMI MARU | Converted Submarine Tender | 4,317 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | TESHIO MARU | Cargo | 2,840 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | SHINSEI MARU NO 18 | Cargo | 2,711 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | UNYU MARU NO 2 | Tanker | 634 | 7-30N, 134-35E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | SHOSEI MARU | Converted Net Tender | 773 | 7-50S, 134-30E | United States | Navy Land- Based Aircraft |
Sunk | ||
| 30 | AKEBONO MARU | Tanker | 10,182 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | AMATSU MARU | Tanker | 10,567 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| March | 30 | 1944 | ASASHIO MARU | Tanker | 5,111 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk |
| 30 | CHUYO MARU | Cargo | 1,900 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | GOSHU MARU | Aircraft Ferry | 8,592 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | GOZAN MARU | Cargo | 3,213 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | HOKUTAI MARU | Cargo | 5,220 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | IRO | Tanker | 6,500 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | KAMIKAZE MARU | Motor Torpedo Boat Tender | 4,916 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | KIBI MARU | Cargo | 2,961 | 7-19N, 134-28E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | KIBI MARU | Cargo | 2,759 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | NISSHO MARU NO 5 | Converted Net Tender | 783 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | OSE | Tanker | 7,987 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | RAIZAN MARU | Cargo | 2,813 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | RYUKO MARU | Passenger-Cargo | 2,764 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | SATA | Tanker | 6,500 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | NAGISAN MARU | Passenger-Cargo | 4,391 | 7-30N, 134-30E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | ATLANTIC MARU | Cargo | 5,873 | 12-15N, 145-42E | United States | Submarine | Sunk | ||
| 30 | IKUSHIMA MARU | Cargo | 3,943 | 20-42N, 143-00E | United States | Submarine | Sunk | ||
| 30 | FUJIKAWA MARU | Cargo | 2,829 | 1-56N, 133-00E | United States | Submarine | Sunk | ||
| 67 Vessels | 263,805 | ||||||||
| April | 1 | 1944 | MINAMI MARU | Cargo | 2,398 | 25-56N, 131-18E | United States | Submarine | Sunk |
| 3 | TOSEI MARU | Passenger-Cargo | 2,814 | 30-00N, 139-44E | United States | Submarine | Sunk | ||
| 5 | TENRYU MARU | Cargo | 554 | 3-35S, 143-38E | United States | Army Aircraft | Sunk | ||
| 8 | ARATAMA MARU | Converted Submarine Tender | 6,784 | 13-16N, 144-45E | United States | Submarine | Sunk | ||
| 8 | KIZUGAWA MARU | Cargo | 1,915 | 13-16N, 144-45E | United States | Submarine | Sunk | ||
| 9 | HOKUREI MARU | Cargo | 515 | 19-00N, 110-00E | United States | Army Aircraft | Sunk | ||
| 9 | BISAKU MARU | Cargo | 4,467 | 15-22N, 145-06E | United States | Submarine | Sunk | ||
| 9 | HONAN MARU | Cargo | 5,401 | 33-50N, 128-01E | United States | Submarine | Sunk | ||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| April | 12 | 1944 | NARITA MARU | Cargo | 1,915 | 2-30S, 140-52E | United States | Army Aircraft | Sunk |
| 12 | TAICHU MARU | Passenger-Cargo | 3,213 | 28-07N, 129-01E | United States | Submarine | Sunk | ||
| 15 | SHINYU MARU | Passenger-Cargo | 4,621 | 6-41N, 123-40E | United States | Submarine | Sunk | ||
| 15 | SUMIDA MARU | Cargo | 2,022 | 42-02N, 142-22E | Japan | Mine* | Sunk | ||
| 16 | YAMAGATA MARU | Passenger-Cargo | 3,807 | 7-04N, 123-27E | United States | Submarine | Sunk | ||
| 16 | MITO MARU | Passenger-Cargo | 7,061 | 2-02S, 127-20E | United States | Submarine | Sunk | ||
| 16 | HINO MARU NO 1 | Cargo | 2,671 | 2-02S, 127-20E | United States | Submarine | Sunk | ||
| 17 | MIKAGE MARU NO 2 | Cargo | 617 | 2-41S, 141-18E | United States | Army Aircraft | Sunk | ||
| 17 | MATSUE MARU | Cargo | 7,061 | 9-22N, 142-18E | United States | Submarine | Sunk | ||
| 19 | KUNITSU MARU | Cargo | 2,724 | 5-54N, 95-20E | United States Great Britain |
Navy Carrier- Based Aircraft Aircraft |
Sunk | ||
| 19 | HARUNO MARU | Cargo | 776 | 5-54N, 95-20E | United States Great Britain |
Navy Carrier- Based Aircraft Aircraft |
Sunk | ||
| 20 | KENRI MARU | Cargo | 2,913 | 34-48N, 125-32E | Japan | Marine Casualty | Probably sunk | ||
| 20 | IWAKUNI MARU | Cargo | 619 | 2-10S, 139-50E | United States | Army Aircraft | Sunk | ||
| 22 | KORYU MARU | Cargo | 6,680 | 10-19N, 107-05E | United States | Army Aircraft | Sunk | ||
| 22 | NAGATA MARU | Converted Gunboat | 2,969 | 10-19N, 107-05E | United States | Army Aircraft | Sunk | ||
| 22 | LONDON MARU | Cargo | 7,190 | 10-19N, 107-05E | United States | Army Aircraft | Sunk | ||
| 22 | YAMAMIZU MARU NO 3 | Tanker | 5,244 | 10-39N, 107-05E | United States | Amy Aircraft | Sunk | ||
| 23 | DAIJU MARU | Cargo | 1,279 | 33-35N, 135-45E | United States | Submarine | Sunk | ||
| 25 | KASHIWA MARU | Converted Net Tender | 976 | 7-09N, 116-48E | United States | Submarine | Sunk | ||
| 26 | WAZAN MARU | Cargo | 4,851 | 33-30N, 135-27E | United States | Submarine | Sunk | ||
| 26 | NOSHIRO MARU | Cargo | 2,333 | 28-37N, 141-00E | United States | Submarine | Sunk | ||
| 26 | TOKIWA MARU | Passenger-Cargo | 806 | 6-12N, 125-47E | United States | Submarine | Sunk | ||
| 26 | YOSHIDA MARU NO 1 | Passenger-Cargo | 5,425 | 18-06N, 119-47E | United States | Submarine | Sunk | ||
| 27 | AKIGAWA MARU | Cargo | 5,244 | 14-50N, 142-23E | United States | Submarine | Sunk | ||
| 27 | MIIKE MARU | Passenger-Cargo | 11,739 | 8-20N, 134-53E | United States | Submarine | Sunk | ||
| 27 | GENBU MARU | Passenger-Cargo | 1,872 | 27-20N, 128-15E | United States | Submarine | Sunk | ||
| 29 | SONG GIANG MARU | Cargo | 1,065 | 13-02N, 109-28E | United States | Submarine | Sunk | ||
| 29 | TAKEGAWA MARU | Cargo | 1,930 | 19-26N, 118-45E | United States | Submarine | Sunk | ||
| 30 | HINO MARU NO 2 | Converted Gunboat | 998 | 7-22N, 151-45E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 30 | NITTATSU MARU | Cargo | 2,859 | 19-11N, 119-10E | United States | Submarine | Sunk | ||
| 38 Vessels | 128,328 | ||||||||
| May | 1 | 1944 | ASOSAN MARU | Cargo | 8,812 | 7-07N, 129-56E | United States | Submarine | Sunk |
| 2 | RYOYO MARU | Passenger-Cargo | 5,973 | 48-04N, 153-16E | United States | Submarine | Sunk | ||
| 3 | AMAGI MARU | Passenger-Cargo | 3,165 | 11-00N, 92-00E | Great Britain |
Submarine | Sunk | ||
| 3 | SHINGU MARU | Cargo | 2,745 | 22-05N, 117-50E | United States | Army Aircraft | Sunk | ||
| 3 | KENAN MARU | Cargo | 3,129 | 15-29N, 145-42E | United States | Submarine | Sunk | ||
| * Probable Agent | |||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| May | 3 | 1944 | FUSHIMI MARU | Passenger-Cargo | 4,935 | 45-28N, 149-56E | United States | Submarine | Sunk |
| 3 | TEISEN MARU | Cargo | 5,050 | 12-54N, 114-07E | United States | Submarine | Sunk | ||
| 4 | TOYOHI MARU | Cargo | 6,436 | 20-51N, 118-02E | United States | Submarine | Sunk | ||
| 4 | SHORYU MARU | Cargo | 6,475 | 20-48N, 118-03E | United States | Submarine | Sunk | ||
| 4 | EIRYU MARU | Converted Net Tender | 758 | 7-04N, 129-18E | United States | Submarine | Sunk | ||
| 4 | TAIBU MARU | Cargo | 6,440 | 20-54N, 118-14E | United States | Submarine* | Sunk | ||
| 4 | TAIYOKU MARU | Cargo | 5,244 | 20-48N, 118-03E | United States | Submarine* | Sunk | ||
| 4 | KINREI MARU | Cargo | 5,947 | 20-58N, 117-59E | United States | Submarine* | Sunk | ||
| 5 | SHIRANE MARU | Cargo | 2,825 | 33-31N, 135-28E | United States | Submarine | Sunk | ||
| 6 | TOYOURA MARU | Cargo | 2,510 | 32-16N, 127-08E | United States | Submarine | Sunk | ||
| 6 | NISSHIN MARU | Tanker | 16,801 | 7-17N, 116-51E | United States | Submarine | Sunk | ||
| 6 | TENSHINZAN MARU | Cargo | 6,886 | 2-42N, 124-10E | United States | Submarine | Sunk | ||
| 6 | TAIJIMA MARU | Passenger-Cargo | 6,995 | 2-42N, 124-10E | United States | Submarine | Sunk | ||
| 6 | ADEN MAW | Passenger-Cargo | 5,824 | 2-42N, 124-10E | United States | Submarine | Sunk | ||
| 7 | ROSSBACH | Tanker | 5,894 | 33-14N, 134-40E | United States | Submarine | Sunk | ||
| 8 | MIYAZAKI MARU | Passenger-Cargo | 3,944 | 41-49N, 141-12E | United States | Submarine | Sunk | ||
| 10 | OKINAWA MARU | Cargo | 2,254 | 11-26N, 143-46E | United States | Submarine | Sunk | ||
| 10 | MIKAGE MARU NO 18 | Passenger-Cargo | 4,319 | 11-26N, 143-46E | United States | Submarine | Sunk | ||
| 10 | CHOAN MARU NO 2 | Converted Gunboat | 2,631 | 11-26N, 143-46E | United States | Submarine | Sunk | ||
| 10 | SHOHEI MARU | Cargo | 7,256 | 15-38N, 119-25E | United States | Submarine | Sunk | ||
| 11 | CHOI MARU | Cargo | 1,074 | 3-30S, 126-06E | United States | Submarine | Sunk | ||
| 11 | MITAKESAN MARU | Passenger-Cargo | 4,441 | 14-58N, 145-26E | United States | Submarine | Sunk | ||
| 11 | SEIRYU MARU | Cargo | 1,904 | 29-30N, 141-40E | United States | Submarine | Sunk | ||
| 12 | BANEI MARU NO 2 | Cargo | 1,186 | 40-01N, 141-58E | United States | Submarine | Sunk | ||
| 12 | KASUMI MARU | Cargo | 1,400 | 5-00N, 100-00E | Japan | Mine | Sunk | ||
| 13 | ANBO MARU | Cargo | 4,523 | 34-31N, 138-33E | United States | Submarine | Sunk | ||
| 14 | KOHO MARU | Cargo | 4,291 | 13-42N, 144-43E | United States | Submarine | Sunk | ||
| 14 | BISAN MARU | Cargo | 4,500 | 9-00N, 133-34E | United States | Submarine | Sunk | ||
| 15 | JOKUJA MARU | Cargo | 6,440 | 10-10N, 131-25E | United States | Submarine | Sunk | ||
| 17 | SHINREI MARU | Cargo | 987 | 5-00S, 110-00E | Great Britain |
Navy Aircraft | Sunk | ||
| 17 | TAIKOKU MARU | Cargo | 2,633 | 14-57N, 144-47E | United States | Submarine | Sunk | ||
| 17 | FUKKO MARU | Passenger-Cargo | 3,834 | 14-55N, 142-30E | United States | Submarine | Sunk | ||
| 17 | NICHIWA MARU | Cargo | 4,955 | 14-45N, 142-40E | United States | Submarine | Sunk | ||
| 18 | SHINRYU MARU | Cargo | 3,181 | 7-36S, 113-125 | United States | Submarine | Sunk | ||
| 20 | JINJU MARU | Cargo | 3,192 | 21-05N, 117-00E | United States | Army Aircraft | Sunk | ||
| 20 | SHOSEI MARU | Converted Gunboat | 998 | 13-32N, 144-36E | United States | Submarine | Sunk | ||
| 20 | MIYAURA MARU | Cargo | 1,856 | 2-14N, 128-00E | United States | Submarine | Sunk | ||
| 20 | OTORI MARU | Cargo | 2,105 | 5-40S, 105-27E | United States | Submarine | Sunk | ||
| 22 | KOSHO MARU | Cargo | 1,365 | 4-55N, 100-21E | Great Britain |
Submarine | Sunk | ||
| 22 | TENPEI MARU | Passenger-Cargo | 6,094 | 5-43N, 127-37E | United States | Submarine | Sunk | ||
| 22 | TSUKUBA MARU | Cargo | 3,172 | 21-20N, 117-10E | United States | Army Aircraft Submarine | Sunk | ||
| 23 | TAIJUN MARU | Cargo | 2,825 | 2-38N, 128-08E | United States | Submarine | Sunk | ||
| 24 | TACHI MARU | Passenger-Cargo | 1,891 | 30-00N, 116-48E | Japan | Marine Casualty | Sunk | ||
| * Probable Agent | |||||||||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| May | 24 | 1944 | TATEKAWA MARU | Tanker | 10,090 | 5-45N, 125-45E | United States | Submarine | Sunk |
| 24 | WALES MARU | Passenger-Cargo | 6,586 | 7-16N, 109-04E | United States | Submarine | Sunk | ||
| 24 | BIZEN MARU | Cargo | 4,667 | 7-25N, 108-43E | United States | Submarine | Sunk | ||
| 25 | TAITO MARU | Passenger-Cargo | 4,466 | 11-30N, 134-55E | United States | Submarine | Sunk | ||
| 25 | OSAKA MARU | Passenger-Cargo | 3,740 | 11-30N, 134-55E | United States | Submarine | Sunk | ||
| 26 | CHIYO MARU | Cargo | 657 | 20-30N, 141-45E | United States | Submarine | Sunk | ||
| 26 | SANYO MARU | Converted Seaplane Tender | 8,360 | 2-48N, 124-19E | United States | Submarine | Sunk | ||
| 26 | AKISHIMA MARU | Cargo | 1,993 | 33-48N, 131-33E | United States | Army Mine | Sunk | ||
| 29 | ANSHU MARU | Converted Gunboat | 2,601 | 3-40S, 126-58E | United States | Submarine | Sunk | ||
| 29 | SHOKEN MARU | Cargo | 1,949 | 16-23N, 144-59E | United States | Submarine | Sunk | ||
| 29 | HORAIZAN MARU | Cargo | 1,999 | 16-23N, 144-59E | United States | Submarine | Sunk | ||
| 30 | SHIGA MARU | Cargo | 742 | 33-15N, 134-11E | United States | Submarine | Sunk | ||
| 30 | SHISEN MARU | Cargo | 2,201 | 24-30N, 122-30E | United States | Submarine | Sunk | ||
| 31 | HOKUYO MARU | Cargo | 1,590 | 48-00N, 153-00E | United States | Submarine | Sunk | ||
| 31 | KOTO MARU | Cargo | 1,053 | 47-52N, 151-02E | United States | Submarine | Sunk | ||
| 31 | MADRAS MARU | Passenger-Cargo | 3,802 | 48-21N, 151-19E | United States | Submarine | Sunk | ||
| 64 Vessels | 258,591 | ||||||||
| June | 1 | 1944 | TOHO MARU | Cargo | 4,716 | 18-13N, 141-19E | United States | Submarine | Sunk |
| 1 | IWAKI MARU | Cargo | 3,124 | 48-00N, 153-00E | United States | Submarine | Sunk | ||
| 1 | HIBURI MARU | Passenger-Cargo | 4,365 | 48-00N, 153-00E | United States | Submarine | Sunk | ||
| 2 | CHIYO MARU | Cargo | 4,700 | 20-53N, 140-17E | United States | Submarine | Sunk | ||
| 4 | KATSUKAWA MARU | Cargo | 6,886 | 19-35N, 138-43E | United States | Submarine | Sunk | ||
| 4 | HAKUSAN MARU | Transport | 10,380 | 22-55N, 136-44E | United States | Submarine | Sunk | ||
| 5 | ASHIZURI | Tanker | 2,166e | 6-32N, 120-40E | United States | Submarine | Sunk | ||
| 5 | TAKASAKI | Tanker | 2,500e | 6-32N, 120-40E | United States | Submarine | Sunk | ||
| 5 | TAMAHIME MARU | Cargo | 3,080 | 17-37N, 140-32E | United States | Submarine | Sunk | ||
| 5 | TAKAOKA MARU | Passenger-Cargo | 7,006 | 17-37N, 140-32E | United States | Submarine | Sunk | ||
| 6 | KASHIMASAN MARU | Cargo | 2,825 | 16-41N, 142-43E | United States | Submarine | Sunk | ||
| 6 | HAVRE MARU | Cargo | 5,652 | 16-41N, 142-43E | United States | Submarine | Sunk | ||
| 8 | SHIOYA | Tanker | 4,000e | 3-04N, 124-03E | United States | Submarine | Sunk | ||
| 10 | HIYOSHI MARU | Cargo | 535 | 3-05N, 99-56E | Great Britain |
Submarine | Sunk | ||
| 10 | KINMON MARU | Cargo | 2,676 | 1-17S, 103-51E | Japan | Marine Casualty | Sunk | ||
| 11 | ASANAGI MARU | Tanker | 5,142 | 6-20N, 120-47E | United States | Submarine | Sunk | ||
| 11 | TOTEN MARU | Cargo | 3,823 | 46-58N, 143-50E | United States | Submarine | Sunk | ||
| 11 | CHIHAYA MARU | Cargo | 1,161 | 46-58N, 143-50E | United States | Submarine | Sunk | ||
| 12 | KAINAN MARU | Cargo | 1,133 | 7-54N, 98-27E | Great Britain |
Submarine | Sunk | ||
| 12 | KEIYO MARU | Passenger-Cargo | 6,442 | 15-14N, 145-44E | United States | Navy Carrier- Based Aircraft Surface Craft |
Sunk | ||
| 12 | BATAVIA MARU | Passenger-Cargo | 4,392 | 17-32N, 143-17E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 12 | FUKOKU MARU | Cargo | 2,851 | 17-30N, 144-00E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| June | 12 | 1944 | HINKO MARU | Cargo | 5,418 | 17-28N, 144-19E | United States | Navy Carrier-Based Aircraft | Sunk |
| 12 | IMIZU MARU | Passenger-Cargo | 2,924 | 17-30N, 144-00E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 12 | KOKKO MARU | Converted Net Tender | 716 | 17-32N, 144-01E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 12 | NITCHO MARU | Cargo | 1,900e | 17-31N, 143-10E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 12 | REIKAI MARU | Cargo | 2,750 | 17-30N, 144-00E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 12 | MOJI MARU | Passenger-Cargo | 3,831 | 17-31N, 144-10E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 12 | MUTSUYO MARU | Cargo | 2,726 | 15-14N, 145-44E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 12 | TENRYUGAWA MARU | Cargo | 3,883 | 17-30N, 144-00E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 12 | SHINTO MARU | Cargo | 2,245 | 17-28N, 144-19E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 13 | TAKASHIMA MARU | Passenger-Cargo | 5,633 | 50-47N, 151-20E | United States | Submarine | Sunk | ||
| 14 | KOAN MARU | Cargo | 3,183 | 4-31N, 122-25E | United States | Submarine | Sunk | ||
| 15 | KOA MARU NO 2 GO | Cargo | 572 | 15-10N, 145-58E | United States | Navy Carrier-Based Aircraft | Probably sunk | ||
| 15 | KANZAKI MARU | Cargo | 1,285 | 36-01N, 129-41E | Japan | Marine Casualty | Sunk | ||
| 15 | TATSUTAGAWA MARU | Cargo | 1,923 | 25-02N, 144-37E | United States | Navy Carrier-Based Aircraft Surface Craft |
Sunk | ||
| 15 | KANSEISHI MARU | Cargo | 4,804 | 29-30N, 141-11E | United States | Submarine | Sunk | ||
| 16 | HINODE MARU | Cargo | 1,916 | 1-01N, 127-49E | United States | Army Aircraft | Sunk | ||
| 16 | SHOFUKU MARU | Cargo | 839 | 00-53S, 131-15E | United States | Army Aircraft | Sunk | ||
| 16 | YUKI MARU | Cargo | 5,704 | 2-19N, 128-40E | United States | Submarine | Sunk | ||
| 16 | NANSHIN MARU | Passenger-Cargo | 1,422 | 2-28N, 118-09E | United States | Submarine | Sunk | ||
| 17 | KINYU MARU | Cargo | 529 | 00-54S, 131-15E | United States | Army Aircraft | Sunk | ||
| 17 | NIPPONKAI MARU | Motor Torpedo Boat Tender | 2,681 | 6-58N, 127-52E | United States | Submarine | Sunk | ||
| 17 | KINSHU MARU | Cargo | 5,591 | 6-17N, 126-17E | United States | Submarine | Sunk | ||
| 18 | EIKO MARU | Cargo | 3,011 | 5-59N, 99-10E | Great Britain |
Submarine | Sunk | ||
| 20 | GENYO MARU | Tanker | 10,018 | 15-30N, 133-55E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 20 | SEIYO MARU | Tanker | 10,536 | 15-30N, 133-55E | United States | Navy Carrier-Based Aircraft | Sunk | ||
| 20 | HIBI MARU | Passenger-Cargo | 5,874 | 5-35N, 125-15E | United States | Submarine | Sunk | ||
| 21 | KANAN MARU | Cargo | 3,312 | 4-04S, 116-45E | United States | Submarine | Sunk | ||
| 22 | NAGARAGAWA MARU | Passenger-Cargo | 990 | 34-35N, 137-56E | United States | Submarine | Sunk | ||
| 23 | SHOUN MARU | Passenger-Cargo | 4,396 | 14-10N, 145-10E | United States | Navy Carrier- Based Aircraft |
Sunk | ||
| 24 | ASO MARU | Passenger-Cargo | 3,028 | 9-57N, 125-07E | United States | Submarine | Sunk | ||
| Date | Name of Vessel | Type of Vessel | Gross Tonnage |
Location | Flag of Agent |
Type of Agent | Assessment | ||
| June | 24 | 1944 | KUMANOYAMA MARU | Cargo | 2,857 | 34-36N, 139-32E |
United States |
Submarine | Sunk |
| 24 | TAMAHOKO MARU | Passenger-Cargo | 6,780 | 32-30N, 129-35E |
United States |
Submarine | Sunk | ||
| 24 | TAINAN MARU | Cargo | 3,175 | 32-30N, 129-35E |
United States |
Submarine | Sunk | ||
| 24 | NASUSAN MARU | Passenger-Cargo | 4,399 | 32-30N, 129-35E |
United States |
Submarine | Sunk | ||
| 24 | KENNICHI MARU | Cargo | 1,938 | 32-30N, 129-35E |
United States |
Submarine* | Sunk | ||
| 25 | YAMAMIYA MAR | ||||||||