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) escort. The setup was hasty at best. All four missed, and she prudently opened range to reload and prepare for another attack on the damaged freighter still afloat. As she approached, her quarry was dead in the water, down by the stern, and partially enveloped by smoke. Two of the escorts were thrashing about the surrounding waters, indiscriminately shooting and dropping depth charges. At 22:35, one of them passed between "Sterlet" and her victim. The submarine shifted her sights on him and, four minutes later, sent three torpedoes streaking at him. The frigate sighted the wakes, immediately turned into them,