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About Tuna Fish:

A tuna is a saltwater fish that belongs to the tribe Thunnini, a subgrouping of the Scombridae (mackerel) family. The Thunnini comprise 15 species across five genera,the sizes of which vary greatly, ranging from the bullet tuna (max. length: 50 cm (1.6 ft), weight: 1.8 kg (4 lb)) up to the Atlantic bluefin tuna (max. length: 4.6 m (15 ft), weight: 684 kg (1,508 lb)). The Atlantic bluefin averages 2 m (6.6 ft), and is believed to live up to 50 years.

Tuna
Temporal range: Ypresian-recent , 56.0–0 Ma
Tuna assortment.png
Tunas (from top): albacore, Atlantic bluefin, skipjack, yellowfin, bigeye
Scientific classification e
Kingdom:
Animalia
Phylum:
Chordata
Class:
Actinopterygii
Order:
Scombriformes
Family:
Scombridae
Subfamily:
Scombrinae
Tribe:
Thunnini
Starks, 1910
Genera
Allothunnus: slender tunas
Auxis: frigate tunas
Euthynnus: little tunas
Katsuwonus: skipjack tunas
Thunnus: albacores, true tunas
Tuna, opah, and mackerel sharks are the only species of fish that can maintain a body temperature higher than that of the surrounding water. An active and agile predator, the tuna has a sleek, streamlined body, and is among the fastest-swimming pelagic fish – the yellowfin tuna, for example, is capable of speeds of up to 75 km/h (47 mph).Greatly inflated speeds can be found in early scientific reports and still widely reported in the popular literature.Found in warm seas, it is extensively fished commercially, and is popular as a game fish. As a result of overfishing, some tuna species, such as the southern bluefin tuna, are threatened with extinction.