Patrol 1

24 Nov 1943 - 1 Jan 1944

No sinkings

Patrol 2

3 Feb 1944 - 28 Mar 1944

伊43 I-43

Patrol 3

22 Apr 1944 - 16 Jun 1944

美山丸 Miyama (Bisan) Maru

ジョグジャ丸 Djokja Maru

Patrol 4

9 Jul 1944 - 18 Aug 1944

北京丸 Peking Maru (abandoned hulk)

Patrol 5

10 Sep 1944 - 25 Oct 1944

安土山丸 Azuchisan Maru

マカッサ丸 Macassar Maru

Patrol 6

21 Nov 1944 - 11 Feb 1945

Patrol 7

25 Jun 1945 - 13 Aug 1945

第7横須賀丸 Yokosuka Maru No. 7 (identity of vessel in doubt, not included in sinking totals below)

7 ships, 34,698 tons, including Peking Maru which had run aground, shared credit for Miyama (Bisan) Maru with USS Bowfin, and shared credit for Shinshu Maru with carrier-based aircraft. Not included is one small vessel Aspro probably sank on he 7th patrol, listed as the 44-ton Yokosuka Maru No. 7 in some sources, although its identity is in doubt.

JANAC - 5 ships, 21,854 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.

Alden-McDonald credit Aspro with 8 ships and 34,741 tons sunk, including (with reservations) Yokosuka Maru No. 7.

SORG credits Aspro with 16 ships and 92,800 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)

Archives of the Pacific Fleet Submarine Museum (PFSM)

War Patrol Reports - USS Aspro

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.

Enright, Joseph F. - Shinano! The Sinking of Japan's Secret Supership, St. Martin's Press, 1987.

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

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

Archives of the Pacific Fleet Submarine Museum (PFSM)

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.