Sevruga caviar as saltier, but it can vary depending on the origin of the fish. The caviar is packaged and sold in red tins. A rare type of caviar known as Imperial Caviar, from the Sterlet sturgeon (Acipenser ruthenus), a now nearly extinct species of sturgeon from the Caspian Sea, is sometimes incorrectly labeled as Sevruga, as well as the even rarer Golden Caviar from the albino Sterlet, the caviar being yellow in color. “Pressed sevruga caviar” can also be found, made of a blend of Osetra and Sevruga caviar that has been heated in a saline solution. Sevruga caviar Sevruga caviar
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