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) and rapidly closed on "Sterlet". This pursuit forced "Sterlet" to retire; and, after more than an hour of running from the frigate and undergoing his bombardment, she managed to open range by firing four torpedoes "down the throat" at him. This tactic did not allow her to escape, and the chase continued until the frigate turned broadside to fire both his forward and after guns in salvo. That curious maneuver allowed "Sterlet" to open range to at which point, the enemy's radar wavered. "Sterlet" shut her radar down, came hard to starboard and opened out. A minute before midnight, "Sterlet"