Southern bluefin tuna
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From Fishing Words
The southern bluefin tuna, Thunnus maccoyii, is a tuna of the family Scombridae found in open southern hemisphere waters of all the worlds oceans mainly between 30°S and 50°S, to nearly 60°S. At up to 2.5 metres (8.2 feet) and weighing up to 400 kg (882 pounds) it is one of the largest bony fishes.
The southern bluefin tuna is a large streamlined fast swimming fish with a long slender caudal peduncle and relatively short dorsal, pectoral and anal fins. The body is completely covered in small scales.
The body colour is blue-black on the back and silver-white on the flanks and belly, with bright yellow caudal keels in adult specimens. The first dorsal fin colour is grey with a yellow tinge, the second dorsal is red-brown, and the finlets are yellow with a darker border.
The southern bluefin tuna is an opportunistic feeder, preying on a wide variety of fishes, crustaceans, cephalopods, salps, and other marine animals.
