Seychelles | 1997 | 10 Cents| Tuna

 



Tuna




Tuna are saltwater finfish in the tribe Thunnini of the mackerel family, comprising fifteen species of widely varying size, from the small bullet tuna to the massive Atlantic bluefin, which can reach 4.6 m and live up to 50 years. Equipped with specialized circulatory and respiratory systems, tuna can maintain body temperatures above ambient water and are among the fastest pelagic swimmers. Found in warm seas, they are heavily targeted by commercial and sport fisheries, and intense overfishing has driven some species, notably the Southern bluefin tuna, to critically low population levels.


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