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A tuna is a saltwater finfish that belongs to the tribe Thunnini, a sub-grouping of the mackerel family – which together with the tunas, also includes the bonitos, mackerels, and Spanish mackerels. Thunnini comprises fifteen species across five genera, the sizes of which vary greatly, ranging from the bullet tuna up to the Atlantic bluefin tuna. The bluefin averages 2 m, and is believed to live for up to 50 years. Their circulatory and respiratory systems are unique...

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