Sunfish dodged between lighted sampans to attack a 10-ship convoy, sinking the Kozon Maru, which also exploded. Fifth and sixth war patrols, October 1943 – March 1944 Sunfish refitted at Pearl Harbor and sailed on 16 October to patrol area northeast of Formosa. She returned to Pearl Harbor on 14 December 1943 without finding any worthy targets. On 14 January 1944, Sunfish set off to patrol the shipping lanes between the Caroline and Mariana Islands. She made a photographic reconnaissance of Kusaie and another atoll in the Carolines between 21 January and 30 January. On 23 February, the submarine made four attacks on a convoy, sinking the Kunishima Maru and the Shinyubari Maru with a combined tonnage of 9,437 tons of enemy shipping. When she returned to Pearl Harbor on 7 March, she was routed onward to San Francisco for an overhaul, which was completed in early June. Seventh and eighth war patrols, June – September 1944 Following her overhaul, the Sunfish returned to Pearl Harbor and departed for her seventh war patrol on 22 June in the Kuril Islands area. She sank the passenger-cargo ship Shanmai Maru on the night of 5 July. The next day, the submarine engaged and destroyed a fleet of 14 sampans and trawlers with her deck guns. Sunfish mistakenly sank the Soviet merchant ship Ob on 6 July and sank the 6,284-ton cargo ship Taihei Maru on the morning of 9 July. Sunfish steamed to Midway for a refit period from 1 August to 19 August. Sunfish began her eighth war patrol on 20 August when she departed Midway for the Yellow Sea. On 10 September she intercepted a convoy coming out of Tsushima Strait, sinking Chihaya Maru and damaging several other targets. On the night of 13 September, the Sunfish attacked another convoy another convoy sinking the Etashima Maru with damage claimed to other targets, including one ship left with her decks awash. The patrol ended at Pearl Harbor on 27 September. Ninth war patrol, October – December 1944 Sunfish returned to the Yellow Sea on 23 October as part of a “wolf pack” that included and . On 17 November, the Sunfish sighted a convoy of eight ships led by the 21,000-ton escort carrier Shinyo. The carrier quickly passed out of range of the Sunfish, which signalled its find to the other members of the wolfpack. The Sunfish attacked the remaining ships