USS Burrfish (SS/SSR-312) was a of the United States Navy named for the burrfish (Chilomycterus schoepfi), a swellfish of the Atlantic coast. The vessel entered service in 1943 and saw action during World War II and in the postwar era. In 1961 Burrfish was loaned to the Royal Canadian Navy where she served as HMCS Grilse (SS 71) and was used primarily as a training boat from 1961 until 1969. Construction and career Burrfish was launched on 18 June 1943 by Portsmouth Navy Yard in Kittery, Maine, sponsored by Miss Jane Elizabeth Davis, daughter of Senator James J. Davis from Pennsylvania. The boat was commissioned 14 September 1943. Burrfishs war operations extended from 2 February 1944 to 13 May 1945 during which period she completed six war patrols, sinking one 5,894-ton German tanker Rossbach in Japanese waters on 7 May 1944 and, along with , a 200-ton patrol boat on 17 November 1944. Her operating area extended from the Western Caroline Islands to Formosa and the waters south of Japan. During her third war patrol the ship accomplished several special missions, conducting reconnaissance of the beaches of Palau and Yap where landings were planned. On 20 December 1944, prior to her fifth war patrol, Lieutenant Commander M. H. Lytle relieved Commander W. B. Perkins, Jr. as commanding officer of Burrfish. Burrfish arrived at Pearl Harbor from her last war patrol 13 May 1945. On 16 May she was ordered to return to the United States for major overhaul and arrived at Portsmouth Navy Yard on 19 June. On 12 October 1945 she reported to New London, Connecticut, for inactivation and was placed out of commission in reserve on 10 October 1946. On 2 November 1948 Burrfish was recommissioned and assigned to Portsmouth Naval Shipyard for conversion to a radar picket submarine. Her designation was changed to SSR-312 on 27 January 1949 and her conversion was completed in November 1949. Burrfish returned to duty with the active fleet 7 February 1950 and was assigned to Submarine Squadron 6 at Norfolk. Between February 1950 and June 1956 she completed three tours with the 6th Fleet in the Mediterranean Sea; participated in several major type and inter-type exercises; and operated along the eastern seaboard as a radar picket ship. On 5 June 1956 Burrfish sailed from Norfolk, Virginia to New London where she reported for inactivation. She was placed out of commission in