Naso annulatus

Acanthuridae
Ringtail Unicornfish, Long-horn Unicornfish, Nosefish, Whitemargin Unicornfish
  • Naso annulatus, North WA, Australia, Photo: Andrew Green
    Naso annulatus, North WA, Australia, Photo: Andrew Green
  • Naso annulatus, Coral Sea, QLD, Photo: Andrew Green
    Naso annulatus, Coral Sea, QLD, Photo: Andrew Green
  • Naso annulatus, Juvenile, Jervis Bay, NSW, Photo: Andrew Green
    Naso annulatus, Juvenile, Jervis Bay, NSW, Photo: Andrew Green
  • Naso annulatus, Juvenile, Nelson Bay, NSW, Photo: Tom Davis
    Naso annulatus, Juvenile, Nelson Bay, NSW, Photo: Tom Davis
Distribution
Temperate Australasia, Tropical Indo-Pacific
Description
Blue-grey body with long tapering horn on forehead projecting well forward of mouth. Tail brown with white radiating markings at rear, trailing filamentous tips on large male, and two tail spines. Juveniles grey with white patch on tail base. Lacks the convex tail shape and the lines on the face and body of N. brevirostris (Spotted Unicornfish).
Information
  • Max Size: 100 cm
  • Sea Temperature Range: 24.0-31.4°C
  • Depth: 1-60m
  • Habitat: Coral Reef, Rocky Reef
  • Habitat Generalisation Index: 1.9
    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: Infrequent (3% 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: Several (6 per transect)
    Abundance is calculated as the average number of individuals recorded per RLS transect, where present.
Edit by: Andrew Green
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