Nemadactylus douglasii

Cheilodactylidae
Grey Morwong, Blue Morwong
  • Nemadactylus douglasii, Northland, New Zealand, Photo: Graham Edgar
    Nemadactylus douglasii, Northland, New Zealand, Photo: Graham Edgar
  • Nemadactylus douglasii, Adult, Jervis Bay, NSW, Australia, Photo: Rick Stuart-Smith
    Nemadactylus douglasii, Adult, Jervis Bay, NSW, Australia, Photo: Rick Stuart-Smith
  • Nemadactylus douglasii, Adult, Coffs Harbour, NSW, Photo: Ian Shaw
    Nemadactylus douglasii, Adult, Coffs Harbour, NSW, Photo: Ian Shaw
Distribution
Temperate Australasia
Description
Similar shape to the jackass morwong, but is easily recognised by its distinctive blue colouration, particularly on the fins. The largest schools occur below diveable depths, where they are commercially trawled.
Information
  • Max Size: 74 cm
  • Sea Temperature Range: 13.0-23.8°C
  • Depth: 10-100m
  • Habitat: Rocky Reef, Soft sediment
  • Habitat Generalisation Index: 14.2
    Also referred to as the SGI (Species generalisation index), this describes the habitat niche breadth of the species. Species with values less than 15 are found in a relatively narrow range of reef habitat types (specialists), while those over 25 may be found on most hard substrates within their range (generalists). Learn more here
Rarity
  • IUCN Threat Status: Not Evaluated
  • Occurrence: Frequent (16% of sites)
    Occurrence describes how often the species is found on surveys within its distribution. It is calculated as the % of reef sites surveyed by RLS divers across all the ecoregions in which the species has been observed
  • Abundance: Few (2 per transect)
    Abundance is calculated as the average number of individuals recorded per RLS transect, where present.
Edit by: GJ Edgar. 2008. Australian Marine Life. New Holland, Sydney
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