Naso unicornis

Acanthuridae
Blue-spine Unicornfish, Brown Unicorn-fish, Unicorn Tang, Unicornfish
  • Naso unicornis, Red Sea, Photo: Rick Stuart-Smith
    Naso unicornis, Red Sea, Photo: Rick Stuart-Smith
  • Naso unicornis, Juvenile, NSW, Australia, Photo: John Turnbull
    Naso unicornis, Juvenile, NSW, Australia, Photo: John Turnbull
  • Naso unicornis, Red Sea, Photo: Rick Stuart-Smith
    Naso unicornis, Red Sea, Photo: Rick Stuart-Smith
  • Naso unicornis, Juvenile, NSW, Australia, Photo: Ian Shaw
    Naso unicornis, Juvenile, NSW, Australia, Photo: Ian Shaw
  • Naso unicornis, NSW, Australia, Photo: Ian Shaw
    Naso unicornis, NSW, Australia, Photo: Ian Shaw
Distribution
Temperate Australasia, Tropical Indo-Pacific
Description
High, olive to blue body, convex head profile, short horn in adults which doesn’t project past mouth, dorsal and anal fins with fine blue margin, and two blue spines on tail base.
Information
  • Max Size: 70 cm
  • Sea Temperature Range: 17.4-30.9°C
  • Depth: 1-180 m
  • Habitat: Coral Reef, Rocky Reef
  • Habitat Generalisation Index: 24.2
    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: Least Concern
  • Occurrence: Common (24% 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 (3 per transect)
    Abundance is calculated as the average number of individuals recorded per RLS transect, where present.
Edit by: Joe Shields
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