Hapuku

Hāpuku
Hāpuku from Kelly Tarlton's Sea Life Aquarium, Auckland.
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Perciformes
Family:	Polyprionidae
Genus:	Polyprion
Species:	P. oxygeneios
Binomial name
Polyprion oxygeneios (Schneider & Forster, 1801)

The hāpuku, hapuka, or whapuku (Polyprion oxygeneios) is a wreckfish of the family Polyprionidae, found around southern Australia, Chile, Tristan da Cunha, and New Zealand at depths between 30 and 800 m. Its length is between 60 and 180 cm, and it can weigh up to 100 kg. It is sometimes described locally as cod, although that properly refers to other fish.

Hāpuku are grey in colour with silvery white underbellies, with juveniles generally being blue in colour. They have 10 dorsal spines running along their back, a rounded anal fin and rounded pectoral fins, and a large, powerful, square-shaped tail. Its lower jaw protrudes from the top, and their very large eyes are adapted for hunting and inhabiting low-light conditions.

Juveniles are thought to be pelagic, switching to demersal when they are about 50 cm in length. They inhabit temperate and subtropical waters of the southern Indian Ocean and Pacific Ocean, being found in Chile, southeastern Australia, and New Zealand. They can be found in waters between 10m and 800 m deep, but generally prefer waters deeper than 50 m. They are usually found living in cracks, caverns, or caves when found in shallow waters. They are voracious predators, feeding on a large range of other fish species, invertebrates and crustaceans, including red cod and blue cod, hoki, crabs, and crayfish.

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Wikipedia