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Pacific Yellowfin Tuna (Thunnus albacares), also known as Ahi, Kihada; weight – 180 kg (400 lb); length – up to 1.8 m (6 ft); lifespan – 6 to 7 years. An adult Yellowfin Tuna can be distinguished from other tunas by its long, bright-yellow dorsal fin and a yellow stripe down its side. Adult Yellowfin Tuna feed near the top of the food chain on fish, squid, and crustaceans. Image courtesy of NOAA.