No.1-class auxiliary submarine chaser

The No.1 class auxiliary submarine chaser (第一号型駆潜特務艇,) was a class of submarine chasers of the Imperial Japanese Navy (IJN), serving during World War II. 200 vessels were built under the Maru Kyū Programme (Ship # 500–599) and the Maru Sen Programme (Ship # 2001–2100).

Background

 * In 1939, the IJN wanted the point-defence subchaser for defence of their naval bases. In 1940, they built small prototype submarine chasers (No.1182 and No.1183) from a standard wooden fishing boat.
 * The IJN made a try of them, and they confirmed that it was effective subchaser. In 1941, the IJN ordered 100 vessels.
 * In the wartime, their performance were good. However, they were always troubled by insect damage, because their hull was wood.
 * They who survived war played an active part for minesweeping of magnetic mines.

Ships in class
Maru Kyū Programme vessels. (Ship # 500–599)
 * Aux. Submarine Chaser No.1, completed on 27 March 1943, survived war. Transferred to Japan Maritime Safety Agency as patrol boat and renamed Chidori (PS-18) on 1 May 1948. Later renumbered PS-134. Discarded 1960.
 * Aux. Submarine Chaser No.2, completed on 15 March 1943, sunk by HMS Tally-Ho on 6 October 1944.
 * Aux. Submarine Chaser No.3, completed on 4 April 1943, survived war.
 * Aux. Submarine Chaser No.4, completed on 18 April 1943, survived war. Transferred to Japan Maritime Safety Agency and renamed Kiji (PB-20) on 1 May 1948. Renumbered NS 81 in 1953. Discarded 1959.
 * Aux. Submarine Chaser No.5, completed on 26 February 1943, sunk by USS Nicholas on 18 August 1943.
 * Aux. Submarine Chaser No.6, completed on 12 March 1943, sunk by USN submarine on 7 July 1944.
 * Aux. Submarine Chaser No.7, completed on 12 March 1943, survived war.
 * Aux. Submarine Chaser No.8, completed on 17 April 1943, struck a naval mine and sunk on 9 September 1944.
 * Aux. Submarine Chaser No.9, completed on 10 May 1943, struck a naval mine and sunk on 9 September 1944.
 * Aux. Submarine Chaser No.10, completed on 9 April 1943, sunk in action on 18 March 1944.


 * Aux. Submarine Chaser No.11, completed on 12 March 1943, survived war. Sold to steamship company on 27 April 1948.
 * Aux. Submarine Chaser No.12, completed on 6 April 1943, sunk by USS Nicholas on 18 August 1943.
 * Aux. Submarine Chaser No.13, completed on 12 March 1943, heavily damaged in action on 1 November 1943, later scuttled.
 * Aux. Submarine Chaser No.14, completed on 8 May 1943, sunk in action on 30 January 1944.
 * Aux. Submarine Chaser No.15, completed on 6 March 1943, sunk in action on 22 October 1944.
 * Aux. Submarine Chaser No.16, completed on 10 May 1943, sunk in action on 16 February 1944.
 * Aux. Submarine Chaser No.17, completed on 10 May 1943, sunk in action on 18 February 1944.
 * Aux. Submarine Chaser No.18, completed on 30 April 1943, sunk in action on 30 January 1944.
 * Aux. Submarine Chaser No.19, completed on 24 April 1943, sunk in action on 30 January 1944.
 * Aux. Submarine Chaser No.20, completed on 15 April 1943, survived war.


 * Aux. Submarine Chaser No.21, completed on 5 May 1943, sunk in action on 30 January 1944.
 * Aux. Submarine Chaser No.22, completed on 20 June 1943, sunk in action on 30 March 1944.
 * Aux. Submarine Chaser No.23, completed on 5 June 1943, sunk in action on 9 July 1944.
 * Aux. Submarine Chaser No.24, completed on 8 July 1943, survived war.
 * Aux. Submarine Chaser No.25, completed on 14 May 1943, sunk in action on 31 January 1944.
 * Aux. Submarine Chaser No.26, completed on 1 June 1943, sunk in action on 30 March 1944.
 * Aux. Submarine Chaser No.27, completed on 10 July 1943, survived war. Transferred to Japan Maritime Safety Agency and renamed Tsubame (PS-23) on 1 May 1948. Discarded 1952.
 * Aux. Submarine Chaser No.28, completed on 26 May 1943, sunk in action on 30 January 1944.
 * Aux. Submarine Chaser No.29, completed on 5 August 1943, sunk in action on 22 February 1944.
 * Aux. Submarine Chaser No.30, completed on 10 July 1943, sunk in action on 4 November 1943.


 * Aux. Submarine Chaser No.31, completed on 10 June 1943, sunk in action on 16 October 1943.
 * Aux. Submarine Chaser No.32, completed on 15 June 1943, sunk in action on 24 September 1944.
 * Aux. Submarine Chaser No.33, completed on 21 May 1943, sunk in action on 31 January 1944.
 * Aux. Submarine Chaser No.34, completed on 14 August 1943, sunk in action on 19 February 1944.
 * Aux. Submarine Chaser No.35, completed on 17 August 1943, survived war.
 * Aux. Submarine Chaser No.36, completed on 5 August 1943, survived war.
 * Aux. Submarine Chaser No.37, completed on 5 August 1943, sunk by USS Lizardfish on 5 July 1945.
 * Aux. Submarine Chaser No.38, completed on 28 June 1943, sunk in action on 30 April 1944.
 * Aux. Submarine Chaser No.39, completed on 24 July 1943, sunk in action on 21 September 1944.
 * Aux. Submarine Chaser No.40, completed on 20 August 1943, sunk in action on 22 January 1944.


 * Aux. Submarine Chaser No.41, completed on 15 July 1943, survived war.
 * Aux. Submarine Chaser No.42, completed on 27 August, sunk by USS Hardhead on 23 June 1945.
 * Aux. Submarine Chaser No.43, completed on 24 August 1943, converted tugboat and renamed No.1648 on 15 February 1944, survived war.
 * Aux. Submarine Chaser No.44, completed on 15 September 1943, converted tugboat and renamed No.1649 on 15 February 1944, survived war.
 * Aux. Submarine Chaser No.45, completed on 15 July 1943, survived war.
 * Aux. Submarine Chaser No.46, completed on 20 July 1943, sunk in action on 4 April 1944.
 * Aux. Submarine Chaser No.47, completed on 22 September 1943, sunk in action on 20 March 1944.
 * Aux. Submarine Chaser No.48, completed on 30 September 1943, sunk in action on 21 February 1944.
 * Aux. Submarine Chaser No.49, completed on 20 October 1943, survived war.
 * Aux. Submarine Chaser No.50, completed on 9 August 1943, sunk by USS Bluefish on 9 July 1945.


 * Aux. Submarine Chaser No.51, completed on 4 August 1943, sunk in action on 13 June 1944.
 * Aux. Submarine Chaser No.52, completed on 19 October 1943, sunk in action on 25 October 1944.
 * Aux. Submarine Chaser No.53, completed on 5 October 1943, sunk in action on 30 March 1944.
 * Aux. Submarine Chaser No.54, completed on 5 October 1943, sunk in action on 17 June 1944.
 * Aux. Submarine Chaser No.55, completed on 15 November 1943, survived war.
 * Aux. Submarine Chaser No.56, completed on 15 October 1943, sunk in action on 17 June 1944.
 * Aux. Submarine Chaser No.57, completed on 30 October 1943, survived war. Transferred to Japan Maritime Safety Agency as patrol boat and renamed Kawasemi (PS-21) on 1 May 1948. Later renumbered PS 136. Discarded 1957.
 * Aux. Submarine Chaser No.58, completed on 16 November 1943, survived war. Transferred to Japan Maritime Safety Agency as patrol boat and renamed Uzura (PS-32) on 1 May 1948. Renumbered PS 140 later and discarded 1960.
 * Aux. Submarine Chaser No.59, completed on 28 August 1943, sunk in action in June 1945.
 * Aux. Submarine Chaser No.60, completed on 18 October 1943, survived war.


 * Aux. Submarine Chaser No.61, completed on 11 September 1943, survived war.
 * Aux. Submarine Chaser No.62, completed on 27 August 1943, sunk in action on 20 March 1944.
 * Aux. Submarine Chaser No.63, completed on 25 December 1943, lost in an accident on 10 June 1945.
 * Aux. Submarine Chaser No.64, completed on 20 November 1943, sunk in action on 6 January 1945.
 * Aux. Submarine Chaser No.65, completed on 4 December 1943, survived war. Sold to Aomori Prefecture on 21 April 1948.
 * Aux. Submarine Chaser No.66, completed on 24 October 1943, sunk in action on 7 August 1945.
 * Aux. Submarine Chaser No.67, completed on 27 December 1943, survived war.
 * Aux. Submarine Chaser No.68, completed on 9 December 1943, survived war.
 * Aux. Submarine Chaser No.69, completed on 30 December 1943, survived war.
 * Aux. Submarine Chaser No.70, completed on 30 September 1943, survived war.


 * Aux. Submarine Chaser No.71, completed on 30 October 1943, survived war. Transferred to Japan Maritime Safety Agency as patrol boat and renamed Hōjiro (PS-39) on 1 May 1948. Discarded 1964.
 * Aux. Submarine Chaser No.72, completed on 20 December 1943, survived war. Transferred to Japan Maritime Safety Agency as minesweeper and renamed Umitsubame (MS 07) on 1 May 1948. To Maritime Self Defense Force 1954. Renumbered MSI 697. Transferred to habour service 1961.
 * Aux. Submarine Chaser No.73, completed on 22 December 1943, sunk by USS Bearss on 26 June 1945.
 * Aux. Submarine Chaser No.74, completed on 17 November 1943, survived war.
 * Aux. Submarine Chaser No.75, completed on 8 February 1944, survived war.
 * Aux. Submarine Chaser No.76, completed on 1 January 1944, sunk in action on 11 December 1944.
 * Aux. Submarine Chaser No.77, completed on 20 December 1943, sunk in action on 28 August 1944.
 * Aux. Submarine Chaser No.78, completed on 15 October 1943, survived war. Transferred to Japan Maritime Safety Agency and renamed Ōtori (PS-28) on 1 May 1948. Redesignated MS 82 1953. Transferred to Maritime Self Defense Force 1954. Discarded 1959
 * Aux. Submarine Chaser No.79, completed on 26 February 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed MS 08 on 1 May 1948.
 * Aux. Submarine Chaser No.80, completed on 15 December 1943, survived war. Transferred to Japan Maritime Safety Agency and renamed Sekirei (PB-08) on 1 May 1948.


 * Aux. Submarine Chaser No.81, completed on 11 January 1944, survived war.
 * Aux. Submarine Chaser No.82, completed on 22 December 1943, sunk in action on 22 October 1944.
 * Aux. Submarine Chaser No.83, completed on 22 December 1943, survived war.
 * Aux. Submarine Chaser No.84, completed on 19 January 1944, sunk in action on 12 November 1944.
 * Aux. Submarine Chaser No.85, completed on 23 March 1944, sunk in action on 8 July 1945.
 * Aux. Submarine Chaser No.86, completed on 20 December 1943, survived war. Transferred to Japan Maritime Safety Agency and renamed MS 09 on 1 May 1948.
 * Aux. Submarine Chaser No.87, completed on 13 February 1944, sunk in action on 12 October 1944.
 * Aux. Submarine Chaser No.88, completed on 25 February 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed MS 10 on 1 May 1948.
 * Aux. Submarine Chaser No.89, completed on 5 November 1943, survived war. Sold to Ministry of Education on 29 May 1948.
 * Aux. Submarine Chaser No.90, completed on 12 February 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed MS 11 on 1 May 1948.


 * Aux. Submarine Chaser No.91, completed on 13 March 1944, sunk in action on 25 January 1945.
 * Aux. Submarine Chaser No.92, completed on 27 January 1944, lost in an accident on 4 October 1944.
 * Aux. Submarine Chaser No.93, completed on 1 March 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed MS 12 on 1 May 1948.
 * Aux. Submarine Chaser No.94, completed on 9 March 1944, sunk by rough weather on 23 September 1944.
 * Aux. Submarine Chaser No.95, completed on 29 March 1944, sunk in action on 18 October 1944.
 * Aux. Submarine Chaser No.96, completed on 10 March 1944, survived war.
 * Aux. Submarine Chaser No.97, completed on 10 February 1944, sunk by USS Sennet on 19 April 1945.
 * Aux. Submarine Chaser No.98, completed on 20 February 1944, sunk in action on 24 July 1945.
 * Aux. Submarine Chaser No.99, completed on 11 March 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed MS 13 on 1 May 1948.
 * Aux. Submarine Chaser No.100, completed on 10 February 1944, survived war.

Maru Sen Programme vessels. (Ship # 2001–2100)
 * Aux. Submarine Chaser No.151, completed on 14 March 1944, aground by rough weather on 15 April 1945, later scutlled.
 * Aux. Submarine Chaser No.152, completed on 10 February 1944, missing in action in end of 1944.
 * Aux. Submarine Chaser No.153, completed on 19 April 1944, struck a naval mine and sunk in shallow water on 6 July 1945.
 * Aux. Submarine Chaser No.154, completed on 24 April 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Uguisu (PB-06) on 1 May 1948.
 * Aux. Submarine Chaser No.155, completed on 25 April 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Shigi (PB-26) on 1 May 1948.
 * Aux. Submarine Chaser No.156, completed on 31 March 1944, sunk in action on 29 March 1945.
 * Aux. Submarine Chaser No.157, completed on 20 April 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Aosagi (PB-37) on 1 August 1948.
 * Aux. Submarine Chaser No.158, completed on 24 April 1944, survived war. Sold to Ministry of Education on 25 May 1948.
 * Aux. Submarine Chaser No.159, completed on 17 May 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Hinazuru (PB-38) on 1 August 1948.
 * Aux. Submarine Chaser No.160, completed on 3 May 1944, survived war.


 * Aux. Submarine Chaser No.161, completed on 3 July 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Kotaka (PB-24) on 1 May 1948.
 * Aux. Submarine Chaser No.162, completed on 26 May 1944, survived war. Sold to fishery company on 5 May 1948.
 * Aux. Submarine Chaser No.163, completed on 23 June 1944, heavily damaged in action on 4 January 1945, later scuttled.
 * Aux. Submarine Chaser No.164, completed on 22 June 1944, survived war. Sold to steamship company on 5 May 1948.
 * Aux. Submarine Chaser No.165, completed on 25 April 1944, survived war.
 * Aux. Submarine Chaser No.166, completed on 10 June 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Hato (PB-17) on 1 May 1948.
 * Aux. Submarine Chaser No.167, completed on 13 June 1944, struck a naval mine and sunk on 15 August 1945.
 * Aux. Submarine Chaser No.168, completed on 6 July 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed MS 57 on 1 May 1948.
 * Aux. Submarine Chaser No.169, completed on 31 May 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Yamasemi (PB-11) on 1 May 1948.
 * Aux. Submarine Chaser No.170, completed on 5 May 1944, survived war. (in apraxia)


 * Aux. Submarine Chaser No.171, completed on 11 May 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed MS 01 on 1 May 1948.
 * Aux. Submarine Chaser No.172, completed on 15 June 1944, struck a naval mine and sunk on 26 May 1945.
 * Aux. Submarine Chaser No.173, completed on 30 May 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Shirataka (PB-40) on 1 August 1948.
 * Aux. Submarine Chaser No.174, completed on 22 June 1944, survived war.
 * Aux. Submarine Chaser No.175, completed on 9 August 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Kasasagi (PB-01) on 1 May 1948.
 * Aux. Submarine Chaser No.176, completed on 9 August 1944, sunk in action on 4 January 1945.
 * Aux. Submarine Chaser No.177, completed on 18 May 1944, survived war.
 * Aux. Submarine Chaser No.178, completed on 7 July 1944, survived war.
 * Aux. Submarine Chaser No.179, completed on 30 May 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Yamagara (PB-41) on 1 August 1948.
 * Aux. Submarine Chaser No.180, completed on 17 July 1944, survived war.


 * Aux. Submarine Chaser No.181, completed on 15 June 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Hibari (PB-16) on 1 May 1948.
 * Aux. Submarine Chaser No.182, completed on 3 July 1944, survived war. (in apraxia)
 * Aux. Submarine Chaser No.183, completed on 3 July 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Benizuru (PB-12) on 1 May 1948.
 * Aux. Submarine Chaser No.184, completed on 14 July 1944, survived war.
 * Aux. Submarine Chaser No.185, completed on 3 September 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Hayabusa (PB-19) on 1 May 1948.
 * Aux. Submarine Chaser No.186, completed on 4 September 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Hatsukari (PB-13) on 1 May 1948.
 * Aux. Submarine Chaser No.187, completed on 3 June 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Yamadori (PB-04) on 1 May 1948.
 * Aux. Submarine Chaser No.188, completed on 10 July 1944, struck a naval mine and sunk on 3 July 1945.
 * Aux. Submarine Chaser No.189, completed on 31 July 1944, sunk in action on 29 March 1945.
 * Aux. Submarine Chaser No.190, completed on 25 July 1944, survived war.


 * Aux. Submarine Chaser No.191, completed on 28 July 1944, survived war.
 * Aux. Submarine Chaser No.192, completed on 30 June 1944, sunk in action on 29 March 1945.
 * Aux. Submarine Chaser No.193, completed on 20 August 1944, survived war.
 * Aux. Submarine Chaser No.194, completed on 21 August 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Mizutori (PB-42) on 1 May 1948.
 * Aux. Submarine Chaser No.195, completed on 18 August 1944, struck a naval mine and sunk on 6 June 1945.
 * Aux. Submarine Chaser No.196, completed on 15 October 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Wakataka (PB-25) on 1 May 1948.
 * Aux. Submarine Chaser No.197, completed on 14 October 1944, struck a naval mine and sunk on 18 June 1945.
 * Aux. Submarine Chaser No.198, completed on 26 June 1944, survived war.
 * Aux. Submarine Chaser No.199, completed on 17 August 1944, missing in action in Spring 1945.
 * Aux. Submarine Chaser No.200, completed on 25 July 1944, sunk in action on 29 March 1945.


 * Aux. Submarine Chaser No.201, completed on 1 September 1944, survived war.
 * Aux. Submarine Chaser No.202, completed on 1 September 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed MS 14 on 1 May 1948.
 * Aux. Submarine Chaser No.203, completed on 14 October 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Hiyodori (PB-22) on 1 May 1948.
 * Aux. Submarine Chaser No.204, completed on 18 September 1944, survived war.
 * Aux. Submarine Chaser No.205, completed on 30 September 1944, sunk in action on 29 March 1945.
 * Aux. Submarine Chaser No.206, completed on 25 August 1944, sunk in action on 26 June 1945.
 * Aux. Submarine Chaser No.207, completed on 17 August 1944, survived war.
 * Aux. Submarine Chaser No.208, completed on 6 October 1944, survived war.
 * Aux. Submarine Chaser No.209, completed on 28 July 1944, sunk in action on 26 June 1945.
 * Aux. Submarine Chaser No.210, completed on 29 August 1944, sunk in action on 5 May 1945.


 * Aux. Submarine Chaser No.211, completed on 20 September 1944, heavily damaged in action and sunk in shallow water on 18 July 1945.
 * Aux. Submarine Chaser No.212, completed on 25 October 1944, survived war.
 * Aux. Submarine Chaser No.213, completed on 28 November 1944, survived war. (in apraxia) Sold to Kanagawa Prefecture on 16 February 1948.
 * No.2064 vessel (Aux. Submarine Chaser No.214), transferred to Karafuto Prefecture, before completed.
 * Aux. Submarine Chaser No.214, substitution of the No.2064 vessel, completed on 8 December 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed MS 14 on 1 May 1948.
 * Aux. Submarine Chaser No.215, completed on 15 August 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed MS 16 on 1 May 1948.
 * Aux. Submarine Chaser No.216, completed on 13 September 1944, sunk in action on 9 January 1945.
 * Aux. Submarine Chaser No.217, completed on 6 December 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Tsugumi (PB-07) on 1 May 1948.
 * Aux. Submarine Chaser No.218, completed on 25 November 1944, survived war.
 * Aux. Submarine Chaser No.219, completed on 9 November 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Shirasagi (PB-14) on 1 May 1948.
 * Aux. Submarine Chaser No.220, completed on 28 December 1944, survived war. Captured by Republic of China in 1945, betrayed to People's Republic of China in 1949.


 * Aux. Submarine Chaser No.221, completed on 28 August 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed MS 02 on 1 May 1948.
 * Aux. Submarine Chaser No.222, completed on 1 November 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed MS 03 on 1 May 1948.
 * Aux. Submarine Chaser No.223, completed on 25 November 1944, survived war. Captured by Republic of China in 1945, betrayed to People's Republic of China in 1949.
 * Aux. Submarine Chaser No.224, completed on 5 October 1944, sunk in action on 5 March 1945.
 * Aux. Submarine Chaser No.225, completed on 31 August 1944, sunk in action on 18 July 1945.
 * Aux. Submarine Chaser No.226, completed on 14 November 1944, survived war. (in apraxia)
 * Aux. Submarine Chaser No.227, completed on 24 October 1944, survived war.
 * Aux. Submarine Chaser No.228, completed on 21 September 1944, survived war.
 * Aux. Submarine Chaser No.229, completed on 11 January 1945, survived war.
 * Aux. Submarine Chaser No.230, completed on 25 October 1944, lost in an accident on 5 June 1945.


 * Aux. Submarine Chaser No.231, completed on 7 December 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed MS 17 on 1 May 1948.
 * Aux. Submarine Chaser No.232, completed on 31 December 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Ōtaka (PB-09) on 1 May 1948.
 * Aux. Submarine Chaser No.233, completed on 10 November 1944, sunk in action on 31 March 1945.
 * Aux. Submarine Chaser No.234, completed on 1 November 1944, survived war.
 * Aux. Submarine Chaser No.235, completed on 18 September 1944, survived war.
 * Aux. Submarine Chaser No.236, completed on 26 October 1944, survived war.
 * Aux. Submarine Chaser No.237, completed on 15 January 1945, sunk in action on 11 June 1945.
 * Aux. Submarine Chaser No.238, completed on 25 November 1944, survived war.
 * Aux. Submarine Chaser No.239, completed on 12 January 1945, survived war.
 * Aux. Submarine Chaser No.240, completed on 9 January 1945, survived war. Captured by Republic of China in 1945.


 * Aux. Submarine Chaser No.241, completed on 22 October 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed MS 04 on 1 May 1948.
 * Aux. Submarine Chaser No.242, completed on 19 December 1944, survived war.
 * Aux. Submarine Chaser No.243, completed on 1 November 1944, survived war.
 * Aux. Submarine Chaser No.244, completed on 1 December 1944, sunk in action on 20 May 1945.
 * Aux. Submarine Chaser No.245, completed on 5 November 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed Manazuru (PB-03) on 1 May 1948.
 * Aux. Submarine Chaser No.246, completed on 22 January 1945, survived war. Transferred to Japan Maritime Safety Agency and renamed MS 05 on 1 May 1948.
 * Aux. Submarine Chaser No.247, completed on 11 December 1944, survived war.
 * Aux. Submarine Chaser No.248, completed on 11 November 1944, survived war.
 * Aux. Submarine Chaser No.249, completed on 14 November 1944, survived war. Transferred to Japan Maritime Safety Agency and renamed MS 06 on 1 May 1948.
 * Aux. Submarine Chaser No.250, completed on 6 October 1944, survived war.