Bluefin tuna is the largest species in the tuna family. It is one of the most expensive fish in the world with delicate meat, rich oil, reddish meat, excellent taste and very expensive price. Bluefin tuna grows slowly and its quantity is very small. It is mainly used to make high-grade sashimi. Its market is all in Japan, and it is also the most favored gourmet fish in Japan.

Bluefin tuna is spindle-shaped, stout and nearly oval in cross section. The snout is conical with a large mouth, and the maxilla extends backward to the middle and lower part of the lower edge of the eye. The tail stalk is thin, and there are 1 big 2 small ridges on both sides. The body is covered with small round scales, and the chest scales are extra large, forming a breastplate. There are two dorsal fins, which are very close. The pectoral fin is short, ending in the middle of the first dorsal fin. Dissociation of apical process of ventral fin. There are 8- 10 small detached fins behind the second dorsal fin and gluteal fin respectively. The caudal fin is crescent-shaped

Living habits of bluefin tuna

Atlantic bluefin tuna is an pelagic fish, which is close to the coast seasonally. It can withstand a considerable temperature range, living above and below the thermocline, and the depth is over 9850 meters. Atlantic bluefin tuna showed a strong group swimming habit when it was young. Group tours are mainly eyesight-oriented, and most of them swim at night.

Therefore, other senses (especially lateral lines) seem to be related to this behavior. In summer, Atlantic bluefin tuna seasonally moves to the northern areas along the coast of Japan and the Pacific coast of North America. Adult fish can migrate across the Pacific Ocean: some migrate eastward and some migrate westward. Atlantic bluefin tuna can cross the Atlantic Ocean in less than 60 days. They can swim at a speed of 72.5 kilometers per hour.