Sterlet Sterlet The sterlet ("Acipenser ruthenus") is a relatively small species of sturgeon from Eurasia native to large rivers that flow into the Black Sea, Azov Sea, and Caspian Sea, as well as rivers in Siberia as far east as Yenisei. Populations migrating between fresh and salt water (anadromous) have been extirpated. Due to overfishing (for its flesh, caviar, and isinglass), pollution, and dams, the sterlet has declined throughout its native range and is considered vulnerable by the IUCN. Restocking projects are ongoing, and it has been introduced to some regions outside its native range, but the latter have generally not
USS Sterlet (SS-392) October and unleashed four torpedoes on small convoy. Results: four misses. Not to be denied, "Sterlet" made another approach on the convoy. This time, four of the six fish she launched scored. Three hit a large gasoline tanker, and the fourth plowed into a freighter. The tanker, "Jinei Maru", is known definitely to have gone down. "Sterlet" spent the remainder of the day evading the attacks of the escorts. That night, she allowed a hospital ship to pass unmolested. She attacked a small freighter with four torpedoes on 29 October, but had to surface and sink it with her deck