Tuna

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Tuna (pl.: tuna or tunas) are saltwater fish belonging to the tribe Thunnini, a subgrouping of the mackerel family (Scombridae). The Thunnini comprise 15 species across five genera, the sizes of which vary from the bullet tuna (max length 50 cm or 1.6 ft, weight 1.8 kg or 4 lb) to the Atlantic bluefin tuna (max length 4.6 m or 15 ft, weight 684 kg or 1,508 lb), which averages 2 m (6.6 ft) and is believed to live up to 50 years. Tuna, opah, and mackerel sharks are the only species of fish that can maintain a body temperature higher than that of the surrounding water. Active and agile predators, tuna have a sleek, streamlined body, and are among the fastest-swimming pelagic fish — the yellowfin tuna, for example, is capable of speeds of up to 75 km/h (47 mph). Found in warmer seas, tuna are commercially fished extensively as a food fish, and are popular as a bluewater game fish. As a result of overfishing, some tuna species, such as the southern bluefin tuna, are threatened with extinction.

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