Tuna is mainly distributed in the Pacific Ocean, Indian Ocean and Atlantic Ocean. Mostly distributed in places with high water temperature and low latitude. The latitude of the Arctic Ocean is relatively high, the water temperature is relatively low, and there is basically no tuna. Tuna is a kind of marine fish and cannot live in fresh water. Because they have adapted to the salinity of seawater. If it is put into fresh water, due to different concentrations, water will enter the cells of tuna, causing it to die because it is absorbed by a large number of cells.

Tuna is spindle-shaped, with a black-blue back and a gray-white abdomen. There are seven or eight small fins behind the dorsal fin and gluteal fin, which are carnivorous and live in tropical oceans. Endangered animals, China national first-class protected wild animals.

The living habits of tuna

Tuna is a carnivore and lives in the tropical ocean. It is a marine organism of the family Sparidae, most of which belong to the genus Tuna. Swim fast, the instantaneous speed can reach 160 km, and the average speed is about 60-80 km. The flesh color of tuna is red, because the muscles of tuna carry a lot of oxygen. Some tuna can use the metabolism of swimming muscles to make the temperature of blood in the body higher than the external water temperature. This physiological function can adapt to a wider range of water temperature, and tuna can survive in lower temperature waters.