Patrol 1

23 July 1944-24 Sept 1944

玉津丸 Tamatsu Maru

＃２八紘丸 Hakko Maru No. 2

日満丸 Nichiman Maru

日安丸 Nichian Maru

昭慶丸 Shokei Maru

神天丸 Shinten Maru

Patrol 2

23 Oct 1944-12 Dec 1944

王洋丸 Gyokuyo Maru - JANAC credits Spadefish (only) with this sinking, Alden gives shared credit to USS Barb (SS-220) and Spadefish.

神鷹 Shinyo - Sinking credited to Spadefish in Alden, Cressman, and JANAC, althought JANAC mistakenly identified this ship as 隼鷹 (Junyo). Junyo was heavily damaged in a separate submarine attack by USS Plaice (SS-390) and possibly USS Redfish (SS-395) on 9 Dec 1944, but survived the war.

逢坂山丸 Osakasan Maru - JANAC, Cressman, combinedfleet, and Japanese sources credit USS Peto (SS-265) (only) with this sinking. (JANAC misnames the vessel as "Aisakasan Maru".) Alden gives Spadefish partial credit for this sinking, although it is unclear that any of her torpedoes struck this ship.

Submarine Chaser No. 156 - Credited to Spadefish in JANAC, but was not in this action. While in port in Takao, she was sunk by aircraft on 29 March 1945.

＃６大星丸 Daiboshi Maru No. 6

Patrol 3

6 Jan 1945-13 Feb 1945

久米 Kume

讃岐丸 Sanuki Maru

泰東丸 Tairai Maru

昌平丸 Shohei Maru

Patrol 4

15 Mar 1945-21 Apr 1945

道了丸 Doryo Maru

Hokushin Maru #37 - small vessel not usually counted in sinkings (not credited to Spadefish in JANAC)

Tenjin Maru #3 - small vessel not usually counted in sinkings (not credited to Spadefish in JANAC)

利通号 Ritsu Go (Lee Tung)

第十七日の出丸 Hinode Maru #17 (Naval vessel not credited to Spadefish in JANAC)

Patrol 5

Jun 1945-4 Jul 1945

＃２大源丸 Daigen Maru #2

第八雲海丸 Unkai Maru #8

神通丸 Jintsu Maru

Daido Maru - small vessel not usually counted in sinkings (not credited to Spadefish in JANAC)

青山丸 Seizan Maru

永城 Eijo (aka 永城丸 Eijo Maru)

Note: On June 13, 1945, Spadefish sank Transbalt, a Soviet passenger-cargo ship of 11,439 tons, in error.

Current research credits Spadefish with sinking 24 ships, totaling 90,568 tons, including Gyokuyo Maru (Credited to Spadefish in JANAC, but sharing credit with USS Barb in Alden), Hinode Maru #17, a minesweeper of 235 tons that was not credited to Spadefish in JANAC, as well as three small vessels, Hokushin Maru #37, Tenjin Maru #3, and Daido Maru, also not credited to Spadefish in JANAC. These figures do not include Submarine Chaser No. 156 (credited to Spadefish in JANAC but actually sunk later by aircraft), Osakasan Maru (probably sunk by USS Peto), and the Soviet ship Transbalt (sunk in error).

JANAC credits Spadefish with 21 ships sunk totalling 88,091 tons. Note that the criteria JANAC used included all Japanese Naval vessels (although JANAC did not usually count warships less than 500 tons that were converted from merchant ships) and all Japanese merchant vessels of 500 or more gross tons known or believed to have been lost during the war. Differences between JANAC figures and current research are noted above. Using JANAC's criteria, Spadefish should be credited with the sinking of Hinode Maru No. 17, but research shows that she should not be credited with the sinking of Submarine Chaser No. 156.

Alden-McDonald credit Spadefish with 24 ships (including three small vessels (Hokushin Maru #37, Tenjin Maru #3, and Daido Maru) and 87,295 tons sunk. They also include Gyokuyo Maru, sharing credit with USS Barb, as well as partial credit for Osakasan Maru. These figures do not include Submarine Chaser No. 156 (sunk later by aircraft) and the Soviet ship Transbalt (sunk in error).

Moore in Spadefish credits the boat with 31 ships (minus Transbalt) totalling 95,646 tons. These figures include: Osakasan Maru (6,600 tons), Sub Chaser 156 (100 tons), a schooner (name unknown) (100 tons), a motor sampan (name unknown) (50 tons), a trawler (name unknown) (200 tons), another trawler (name unknown) (100 tons), along with Hokushin Maru #37, Tenjin Maru #3, and Daido Maru.

SORG credits Spadefish with 27 ships and 122,700 tons sunk.

Japanese Naval and Merchant Ship Losses - JANAC on the NHHC website

JANAC on the Hyperwar website - https://www.ibiblio.org/hyperwar/Japan/IJN/JANAC-Losses/JANAC-Losses-6.html

SORG- http://archive.hnsa.org/doc/subreports-sorg.htm (Excel spreadsheet download)

SORG on combinedfleet.com

Archives of the Pacific Fleet Submarine Museum (PFSM)

War Patrol Reports - USS Spadefish - https://issuu.com/hnsa/docs/ss-

Monthly Losses of Combatant and Non-Combatant Vessels

太平洋戦争時の喪失船舶明細表（汽船主体）- Lost Vessel table during the Pacific War (merchant vessels)

Alden, John D., and McDonald, Craig R. - U.S. & Allied Sub Successes in the Pacific & Far East during WWII - Fourth Edition, 2009

Cressman, Robert - The Official Chronology of the U.S. Navy in World War II, Naval Institute Press, 2000.

Moore, Stephen L., Spadefish - On Patrol With A Top-Scoring World War II Submarine, Atraid Press LLC, 2006.

NHHC - Escort Carrier Shinyo Sunk by USS Spadefish (SS-411), 17 November 1944

Wrecksite - https://www.wrecksite.eu/wrecksite.aspx

Miramar Ship Index - https://www.miramarshipindex.nz/

Imperial Japanese Navy Page - http://www.combinedfleet.com/

Wikipedia Japan - https://ja.wikipedia.org/wiki/

Japan Center for Asian Historical Records - National Archives of Japan - https://www.jacar.go.jp/index.html

World War II Armed Forces website https://www.niehorster.org/014_japan/navy-commanders/amx.html (information on Hinode Maru #17)

Official U.S. Navy Photos - Naval History & Heritage Command

Archives of the Pacific Fleet Submarine Museum (PFSM)

Imperial Japanese Navy Page - http://www.combinedfleet.com/

Japanese Merchant Ship photos - Wrecksite - copyright owners retain all rights. Photos used on this site will be taken down should the owner request their removal.