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Threadfin - Blue

Threadfin - Blue
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Also known as:

Blue salmon

Fourfinger threadfin

Bluenose salmon

Colonial salmon

Cooktown salmon

Tassel-fish

Threadfin

Giant threadfin

Common Group Name:

Threadfins

Family Name:

Polynemidae

Genus Name:

Eleutheronema

Species Name:

Eleutheronema tetradactylum


Dispatch Method:

The eating qualities of blue threadfin can be greatly improved if they are killed humanely by iki jime or a firm knock to the head before placing them in an ice slurry after bleeding.


Fish Description:

  • Bluish colour above, with blue fins and prominent fatty eyelid over eyes.
  • Threadfin are so named for the sensory filaments at the base of each pectoral fin. The sensory filaments are used to locate food items in muddy water.
  • Blue threadfin have 3 or 4 shorter filaments per fin, while king threadfin have 5 longer ones.
  • These fish are protandrous hermaphrodites that mature first as males at 20-25 cm long (1 year old) before changing sex into females at around 40 cm long (around 3 years old).

Fish Distribution:

  • This species is found mainly over shallow muddy bottoms in tropical estuaries and coastal waters throughout the Indo-West Pacific region.
  • In Australia they are found in muddy inshore areas along the entire tropical and subtropical northern coastline, with discrete resident populations occurring in major river systems.

Fish Size Common Length:

30-50 cm, maximum size in Australia around 100 cm, reportedly 200 cm and 135 kg elsewhere.