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Etorofu-class escort ship
Etorofu 1943
Class overview
Operators:  Imperial Japanese Navy
Preceded by: Shimushu class
Succeeded by: Mikura class
Completed: 14
Lost: 8
General characteristics
Type: Escort vessel
Displacement: 870 long tons (884 t)
Length: 77.7 m (255 ft)
Beam: 9.1 m (29 ft 10 in)
Draught: 3.05 m (10 ft)
Speed: 19.7 knots (22.7 mph; 36.5 km/h)
Complement: 150
Armament: • 3 × 120 mm (4.7 in)/45 cal DP guns
• 4 × 25 mm (0.98 in) AA guns, later up to 15
• 6 × depth charge throwers
• 36 × depth charges initially, but later up to 60
• 1 × 80 mm (3.1 in) mortar

The Etorofu-class escort ships (択捉型海防艦 Etorofu-gata kaibōkan?) were a class of ships in the service of the Imperial Japanese Navy during World War II.

The Japanese called these ships Kaibōkan, "ocean defence ships", (Kai = sea, ocean, = defence, Kan = ship), to denote a multi-purpose vessel. The fourteen ships of the Etorofu class were a major part of Japan's escorts from the middle of World War II. They were denoted "Improved Type A" ships, and were the second class of Kaibōkan. The Etorofus, unlike the Shimushu class, received more emphasis on submarine warfare. The Etorofu class was initially armed with thirty-six depth charges and would later rise to 60 depth charges with an 8 cm trench mortar and six depth charge throwers. The rise of aircraft also saw the number of AA machine guns increase to 15. They would receive Type 22 and Type 13 radars and Type 93 sonar in 1943-1944.

The ships of the class were the Etorofu (択捉), Hirato[1] (平戸), Tsushima (対馬), Fukae[2] (福江), Matsuwa (松輪), Mutsure (六連), Sado (佐渡), Oki (隠岐), Manju (満珠), Kanju (干珠), Iki (壱岐), Amakusa (天草), Wakamiya (若宮), and Kasado (笠戸). Eight of the fourteen ships, Hirato, Iki, Amakusa, Kanju, Wakamiya, Sado, Mutsure, and Matsuwa were sunk during the war.


  1. 25 May 1943, Notice No. 121, Named three destroyers, three submarines, two coast defence ships, two submarine chasers, and one auxiliary vessel., Minister's Secretariat, Ministry of the Navy.
  2. 5 February 1943, Notice No. 16, Named one destroyer, six submarines, one coast defence ship, one minesweeper, one auxiliary vessel, and one auxiliary boat., Minister's Secretariat, Ministry of the Navy.

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