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Tuna - Southern bluefin

Tuna - Southern bluefin
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Also known as:

Bluefin

SBT

Southern tuna

Southern tunny

Common Group Name:

Mackerels and Tunas

Family Name:

Scombridae

Genus Name:

Thunnus

Species Name:

Thunnus maccoyii


Dispatch Method:

The eating qualities of southern bluefin tuna can be greatly improved if they are killed immediately by iki jime before placing them in an ice slurry after bleeding. A firm knock on the head may be required to stun larger fish first before attempting iki jime.


Fish Description:

  • Dark blue to black dorsally with lower sides and belly silvery white. The first dorsal fin is yellow or bluish; the anal fin and finlets are dusky yellow. Swimbladder present.
  • Southern bluefin tuna mature at around 120 cm and 8 years old, making them a long lived, late maturing species.
  • Like most other tunas, this species is a warm blooded fish. The dark red swimming muscles in the centre of the fillet help maintain their body temperature 2-3°C above that of the surrounding water.

Fish Distribution:

  • Transoceanic in the southern Atlantic, Indian and Pacific oceans. Inhabits temperate and cold seas offshore, mainly between 30°S and 50°S.
  • During spawning, large fish migrate to tropical seas, off the west coast of Australia near Java, Indonesia (10°S).

Fish Size Common Length:

60-150 cm, maximum size 250 cm and 260 kg.