|Description: The yellowfin tuna is a type of tuna found in open waters of tropical and subtropical seas worldwide. The second dorsal fin and the anal fin are both bright yellow and can be very long in mature fish, as are the pectoral fins. The main body is very dark metallic blue, changing to silver on the belly, which has about 20 vertical lines. Yellowfins tend to school with fishes of the same size, including other species of tuna, and larger fish. They are often seen with dolphins, porpoises, whales and whale sharks. Yellowfins eat other fish, crustaceans, and squid. Yellowfins make excellent Sashimi.