Seabirds prey on small little tunny. The little tunny feeds primarily on pelagic fish. Bony fish, Marlins, sea birds, sharks, and rays prey on the little tunny. Several systems were used, principally the Lorenz SZ 40/42 (Tunny) and Geheimfernschreiber (Sturgeon). The little tunny ("Euthynnus alletteratus") is the most common tuna in the Atlantic Ocean. There are many ways to eat the Little Tunny, such as Tuna Salad. The word "Pelamis" is a feminine noun and means young or small tunny fish. The largest little tunny on record is and . Alerted to "Tunny"'s presence, she now bore down on the submarine. The little tunny is typically a schooling species. It quickly became evident that this was a huge leap forward in cryptanalysis of Tunny. Seconds later, two heavy explosions marked the death throes of "Tunny"'s most recent victim. "Tunny" and its sister boat, , were the United States' first nuclear deterrent patrol submarines. Damage to the main control cubicle and to "Tunny"'s remaining torpedoes resulted. These cipher systems were cryptanalysed, particularly Tunny, which the British thoroughly penetrated.