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A tuna is a saltwater fish that belongs to the tribe Thunnini a sub-grouping of the mackerel family. Thunnini comprises fifteen species across five genera the sizes of which vary greatly ranging from the bullet tuna up to the Atlantic bluefin weight 684 kg. The bluefin averages 2m and is believed to live for up to 50 years.
Tuna 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 has a sleek streamlined body and is among the fastest-swimming pelagic fish the yellowfin for example is capable of speeds of up to 75 km/h. Found in warm seas it is extensively fished commercially and is popular as a game fish. As a result of overfishing stocks of some species such as the southern bluefin are close to extinction.
The tuna is a sleek and streamlined fish adapted for speed. It has two closely spaced dorsal fins on its back. The first is depressible it can be laid down flush in a groove that runs along its back. Seven to ten yellow finlets run from the dorsal fins to the tail which is lunate curved like a crescent moon and tapered to pointy tips. The caudal peduncle to which the tail is attached is quite thin with three stabilizing horizontal keels on each side. The tuna's dorsal side is generally a metallic dark blue while the ventral side or underside is silvery or whitish for camouflage.
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