Ossetra genitive case form "осетра" (osetra, 'of sturgeon') of the Russian word "осётр" (osyotr 'sturgeon') from the phrase "икра осетра" (ikra osetra, 'caviar of sturgeon'). At one time, the term "ossetra" simply referred to Russian sturgeon species harvested for this type of caviar. In Russian, there are different names for the species of sturgeon that live in various territories such as "Beluga" ("Huso huso"), Sevruga ("Acipenser stellatus") and Sterlet ("Acipenser ruthenus"). The name Ossetra corresponds to the species "Acipenser gueldenstaedtii", which is much smaller than Beluga sturgeon ("Huso huso"), and has a firmer texture. In the territory of the Russian Federation
USS Sterlet (SS-392) to the western Pacific with the Seventh Fleet. On these cruises, usually of approximately six months duration, she participated in a host of exercises and war game problems and visited most major ports in the Far East, particularly those in Japan, Taiwan, China and in some of the Central Pacific islands. After her return from her final deployment in the summer of 1968, "Sterlet" was found to be unfit for further naval service. Accordingly, she was decommissioned on 30 September 1968, and her name was struck from the Naval Vessel Register on the following day. She rendered her last service