Caviar sturgeon from the Sea of Azov began reaching the tables of aristocratic and noble Byzantine Greeks in the 10th century, after the commencement of large-scale trading between the Byzantine Empire and Kievan Rus'. The main types of caviar are Beluga, Sterlet, Kaluga hybrid, American osetra, Ossetra, Siberian sturgeon and Sevruga. The rarest and costliest is from beluga sturgeon that swim in the Caspian Sea, which is bordered by Iran, Kazakhstan, Russia, Turkmenistan, and Azerbaijan. Wild caviar production was suspended in Russia between 2008 and 2011 to allow wild stocks to replenish. Azerbaijan and Iran also allow the fishing of sturgeon
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