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
HMS Sterlet (2S) reload torpedoes for a total of a dozen torpedoes. They were also armed with a 3-inch (76 mm) deck gun. Ordered on 2 March 1936, "Sterlett" was laid down on 14 July 1936 in HM Dockyard, Chatham and was launched on 22 September 1936. The boat was completed on 6 April 1938. At the onset of the Second World War, "Sterlet" was a member of the 2nd Submarine Flotilla. From 23–26 August 1939 the 2nd Submarine Flotilla transferred to its war bases at Dundee and Blyth. On 8 April 1940 "Sterlet" left for a patrol in the Skagerrak, off Norway