Overview

Comprehensive Description

Biology

Occur on the continental shelf and slope (Ref. 9563). Two forms exist in New South Wales, Australia. The inshore form is dominant in depths less than 300 m and the offshore form is most common in deeper waters (Ref. 30468). Juveniles of both forms are caught near the edge of the continental shelf by fishers targeting royal red prawns (Haliporoides sibogae) in Australia, but their full distribution is unknown (Ref. 6390). Reproduction in ocean perch is distinctive in that fertilization is internal (Ref. 6390, 34817). Feed on squid, shrimps and fish (Ref. 6390). Head and dorsal-fin spines are venomous (Ref. 33616). Sold whole and chilled on the domestic fresh fish markets (Ref. 6390).
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Distribution

Southwest Pacific: Australia and New Zealand. Two forms of ocean perch are recognized in waters off New South Wales, Australia (Ref. 6390). They are referred to as 'inshore' and 'offshore' forms based on their preferred depth ranges (Ref. 6390).A closely related species, Helicolenus barathri, is known from New Zealand and its distribution may also include southern Australian waters (Ref. 30468, 30471).
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Southwestern Pacific.
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Physical Description

Morphology

Dorsal spines (total): 12; Dorsal soft rays (total): 11 - 12; Analspines: 3; Analsoft rays: 5; Vertebrae: 25
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Size

Maximum size: 470 mm ---
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Max. size

47.0 cm TL (male/unsexed; (Ref. 9563)); max. published weight: 1,400 g (Ref. 30476); max. reported age: 42 years (Ref. 30476)
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Ecology

Habitat

Environment

demersal; marine; depth range 50 - 750 m (Ref. 6390)
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Depth range based on 173 specimens in 1 taxon.
Water temperature and chemistry ranges based on 107 samples.

Environmental ranges
  Depth range (m): 45 - 900
  Temperature range (°C): 5.655 - 25.737
  Nitrate (umol/L): 0.293 - 31.712
  Salinity (PPS): 34.416 - 36.031
  Oxygen (ml/l): 4.377 - 5.617
  Phosphate (umol/l): 0.166 - 1.916
  Silicate (umol/l): 0.891 - 30.767

Graphical representation

Depth range (m): 45 - 900

Temperature range (°C): 5.655 - 25.737

Nitrate (umol/L): 0.293 - 31.712

Salinity (PPS): 34.416 - 36.031

Oxygen (ml/l): 4.377 - 5.617

Phosphate (umol/l): 0.166 - 1.916

Silicate (umol/l): 0.891 - 30.767
 
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Depth: 50 - 750m.
From 50 to 750 meters.

Habitat: demersal.
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Trophic Strategy

Found on the continental shelf and continental slope (Ref. 75154). Adult ocean perch are present in depths from 50 m to 750 m. Two forms of ocean perch are recognised in waters off New South Wales, Australia (Ref. 6390). They are referred to as 'inshore' and 'offshore' forms based on their preferred depth ranges (Ref. 6390). The inshore form is dominant in depths less than 300 m and the offshore form is most common in deeper waters (Ref. 30468).The morphology of ocean perch indicates that they feed by resting on the sea bed and ambushing their prey (Ref. 6390).
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Life History and Behavior

Life Cycle

Larvae stay within the female fish until they are approximately 1 mm long before they are released into the water (Ref. 6390).In Australia, the inshore and offshore forms of ocean perch begin mating at different times and there is a difference in the length of their larval development prior to release (Ref. 30468).
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Helicolenus percoides

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 11
Species With Barcodes: 1
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Conservation

Threats

Not Evaluated
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Relevance to Humans and Ecosystems

Benefits

Importance

fisheries: commercial
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Wikipedia

Red gurnard perch

The red gurnard perch or jock stewart, Helicolenus percoides, is a rockfish of the family Sebastidae, found on the continental shelves of Australia and New Zealand at depths of between 50 and 750 m. Its length is up to 47 cm. Also called Ocean Perch, Coral Cod, Coral Perch, Reef Ocean Perch, Red Perch, Red Rock Perch, Red Gurnard Scorpionfish, and Sea Perch.

In the month-long NORFANZ Expedition of 2003 which was examining the biodiversity of the seamounts and slopes of the Norfolk Ridge, thirty specimens averaging 1kg (2.2lb), were collected from three locations.[1]

References[edit]

  1. ^ NORFANZ Voyage Retrieved 2011-10-29.
  • Froese, Rainer and Pauly, Daniel, eds. (2006). "Helicolenus percoides" in FishBase. May 2006 version.
  • Tony Ayling & Geoffrey Cox, Collins Guide to the Sea Fishes of New Zealand, (William Collins Publishers Ltd, Auckland, New Zealand 1982) ISBN 0-00-216987-8
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