average weight of bluefin tuna
The southern bluefin tuna, Thunnus maccoyii, is a tuna of the family Scombridae found in open southern Hemisphere waters of all the world's oceans mainly between 30Â°S and 50Â°S, to nearly 60Â°S. At up to 2.5 metres (8.2 ft) and weighing up to 260 kilograms (570 lb), it is among the larger bony fishes.