Patrol 1

9 Sep 1944 - 13 Nov 1944

Alden gives Icefish partial credit for sinking 第一眞盛丸 Shinsei Maru No. 1, shared with USS Seadragon (SS-194). JANAC credits Snook with sinking Shinsei Maru No. 1.

JANAC credits Icefish with sinking 天晨丸 Tenshin Maru in this attack, although Alden says the attack by USS Snook (SS-279) is more likely to have sunk Tenshin Maru.

黒龍丸 Kokuryu Maru may also have been hit and sunk by Snook and/or Icefish. JANAC credits Seadragon for sinking Kokuryu Maru.

泰洋丸 Taiyo Maru

Patrol 2

8 Dec 1944 - 20 Jan 1945

Patrol 3

20 Feb 1945 - 20 Apr 1945

Patrol 4

15 May 1945 - 4 Jul 1945

No sinkings

Patrol 5

28 Jul 1945 - 22 Aug 1945

Current research credits Icefish with sinking ships, totaling tons, plus two small vessels, one of tons and the other of unknown tonnage. These figures are the same for Alden-McDonald.

JANAC credits Icefish with 2 ships sunk totalling 8,404 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.known tonnage.

SORG credits Icefish with 2 ships of 13,300 tons sunk, plus one lugger of unknown tonnage.

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 Grayling

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.

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//ヘイク_(潜水艦)

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

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.