Hapuku

Polyprion Oxygeneois
Hapuku - Marinewise © 2025 MarineWise

Quick Facts

Scientific name Polyprion Oxygeneois
Other names Blue Cod, Deepwater Rock Cod, Grouper, Hapuka, New Zealand Groper, Whapuku
Size Up to 1.8 m (5.9 ft)
Weight Up to 100 kg (220 lb)

Distribution

Habitat & AU Distribution Coastal & deep ocean waters amongst seamounts, reefs & canyons
Depth Range 100–800 m (330–2,600 ft)
Hapuku Distribution

Interesting Info

  • The Hapuku is native to southern Australia and New Zealand, and also occurs around nearby islands in the southern Pacific.
  • Its body is stout and bluish-grey, fading to silvery below, with irregular darker blotches, especially in younger fish.
  • Juveniles are more patterned, often with bars and spots, which help them blend in with floating kelp and debris.
  • Hapuku are mainly deep water dwellers, living on continental slopes and seamounts in depths of 100–800 m (330–2,600 ft).
  • Adults are ambush predators, feeding on fish, squid, octopus, and crustaceans, which they swallow whole with their powerful jaws.
  • Hapuku are considered excellent eating, with firm, white, mild-flavoured flesh that makes them highly sought after in both commercial and recreational fisheries.
  • Breeding occurs offshore during winter and spring, when adults form spawning aggregations and release eggs into the open water.
  • The larvae drift with currents before juveniles settle under floating kelp rafts and debris, sometimes travelling long distances.
  • As they grow, juveniles move to rocky reefs and eventually deeper offshore slopes.
  • Growth is slow, and they don’t reach sexual maturity until around 10–13 years of age.
  • They are long-lived, with a lifespan of 40–60 years, making them one of the oldest-living marine fishes in the region.
Species Interaction

Commercial & Recreational Fishing, Cultural

The Hapuku has strong interactions with people. It is a prized catch for recreational anglers, especially in New Zealand, where it is legendary for its size and strength. In Australia, it supports a commercial deep-sea fishery, valued for its excellent flesh. In Maori culture, the Hapuku has long been an important traditional food and symbol of abundance.

Scientific Classification

Kingdom: Animalia

Phylum: Chordata

Class: Actinopterygii

Order: Perciformes

Family: Polyprionidae

Genus: Polyprion

Species: Polyprion Oxygeneois

Conservation Status

Hapuku are not currently listed as a threatened species under the Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act). However, the fish is subject to various state and federal regulations aimed at promoting sustainable fishing practices and protecting the species.

Fish Taste Quality

Hapuku is a highly regarded food fish and is known for its firm, white flesh, which is delicate and flavourful. The fish has a mild, slightly sweet taste and a texture that is moist, flaky, and tender when cooked properly.

Taste Rating: 5/5

How to catch
Hapuku

Catch Difficulty: Intermediate

Tackle: Patternoster Rig, Running Sinker Rig, Ganged Hook Rig, Artificial Rig

Bait: Fresh cut flesh baits, Lures, Bait jig, Octopus, Pilchards, Squid, Soft plastics, Live minnow

Technique: Keep bait on the bottom, Keep bait close to the reef/structure, Trolling