The Long-fin Tunny, also known as the Allothunnus falx, is a tunny species found in tropical and warm-temperate waters around the world. It is a popular game fish and is also caught commercially. Other synonyms for this species include the Southern Bluefin Tuna, Pacific Bluefin Tuna, and Northern Bluefin Tuna. The Longfin Tuna is known for its elongated body, dark blue-black upper parts with silver-white sides and belly, and long pectoral fins. It is a highly migratory species that can travel huge distances. Its meat is highly prized and often used for sashimi or sushi in Japanese cuisine.