Ossetra dwells another type of sturgeon, Siberian sturgeon ("Acipenser Baerii"), which is farmed all over the world because it can adapt to a wider range of habitats. It begins to produce caviar faster than "Acipenser gueldenstaedtii". Throughout the entire history of black caviar consumption, reference to Ossetra was made only to the fish that was caught first in Imperial Russia, then the USSR, and now in the Russian Federation. Today, Caspian Ossetra is facing extinction in its native habitat. Farming sturgeon is the only way to continue the production of high-quality caviar. Continuous drastic declines in natural sturgeon populations over the
USS Sterlet (SS-392) back to the western Pacific and after briefly stopping at Pearl Harbor, Guam, and Subic Bay, arrived in Tsingtao, China, on 20 April. She operated out of Tsingtao until the end of May, participating in the Navy's show of force along the northern China coast. She spent the first ten days of June in Shanghai and then got underway for Pearl. "Sterlet" reached Oahu on 22 June and conducted operations in the Hawaiian Islands for the next 16 months. She headed west again on 15 November 1947 and reached Brisbane, Australia, on 1 December. Five days later, the submarine shaped