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) and rapidly closed on "Sterlet". This pursuit forced "Sterlet" to retire; and, after more than an hour of running from the frigate and undergoing his bombardment, she managed to open range by firing four torpedoes "down the throat" at him. This tactic did not allow her to escape, and the chase continued until the frigate turned broadside to fire both his forward and after guns in salvo. That curious maneuver allowed "Sterlet" to open range to at which point, the enemy's radar wavered. "Sterlet" shut her radar down, came hard to starboard and opened out. A minute before midnight, "Sterlet"