Torpedo scientific name tuna, tuna body is fusiform. Slightly laterally compressed, the tail is longer and thinner, the adult second dorsal and anal fins extended, the ventral fins pectoral, the caudal fin is crescent-shaped, the caudal peduncle is well developed, and there are three bulges on each side. The jaws are denticulate, tapered and arranged in a row.

Body covered with fine scales, the scales on the chest are larger and form a pectoral armor. The lateral line section is distinct. The highest part of the body is located in the middle of the base of the first dorsal fin. First gill arch gill rakers 26-34. second dorsal and anal fins very long in large individuals, making an arcuate bend, exceeding 20% of fork length. Pectoral fins longer;

Tuna is distributed in the Indian Ocean, the Pacific Ocean, the Atlantic Ocean tropical and subtropical waters, the Department of oceanic migratory fish. Yellowfin tuna is an economically important species with the largest fishery production in the genus Tuna.

Because of its fast growth rate and oceanic distribution and other characteristics, coupled with high economic value, relatively abundant resources, its tuna fish in the world's production in the forefront.

Expanded Information:

Tuna is an oceanic fish. p>Tuna is an oceanic migratory fish, its distribution is mainly limited by water temperature, distributed in the surface water temperature of 18 ~ 31 ℃ area, a large number of dense in the surface water temperature of 20 ~ 28 ℃ of the water. The water layer is shallow in summer and deeper in winter, and its vertical distribution shows obvious seasonal changes.

Tuna has obvious north-south seasonal migration, its migration route is related to the movement of currents, and temperature, salinity and dissolved oxygen are also closely related to the bait factor has a greater impact on it. Temperature is the main limiting hydrographic condition for yellowfin tuna.

The yellowfin tuna is a carnivorous pelagic fish with low food selectivity, and most of the small fishes, cephalopods and crustaceans in its distribution area can be used as its bait. Feeding is active in the evening and early morning.