Acanthurus nigricauda

Acanthuridae
Eyeline Surgeonfish, Blackstreak Surgeonfish, Epaulette Surgeonfish, Shoulderbar Surgeonfish, White-tail Surgeonfish
  • Acanthurus nigricauda, Bali, Indonesia, Photo: Ian Shaw
    Acanthurus nigricauda, Bali, Indonesia, Photo: Ian Shaw
  • Acanthurus nigricauda, Maldives, Photo: Rick Stuart-Smith
    Acanthurus nigricauda, Maldives, Photo: Rick Stuart-Smith
  • Acanthurus nigricauda, Qld, Australia, Photo: Andrew Green
    Acanthurus nigricauda, Qld, Australia, Photo: Andrew Green
  • Acanthurus nigricauda, Bali, Indonesia, Photo: Ian Shaw
    Acanthurus nigricauda, Bali, Indonesia, Photo: Ian Shaw
  • Acanthurus nigricauda, Maldives, Photo: Rick Stuart-Smith
    Acanthurus nigricauda, Maldives, Photo: Rick Stuart-Smith
  • Acanthurus nigricauda, Maldives, Photo: Rick Stuart-Smith
    Acanthurus nigricauda, Maldives, Photo: Rick Stuart-Smith
Distribution
Tropical Indo-Pacific
Description
Grey body, rounded head profile, long black streak behind eye, long black streak extending forward from black tail spine, and yellow tipped pectoral fin. Markings difficult to distinguish in dark phase. White band on tail base and pale grey tail, which is strongly lunate.
Information
  • Max Size: 40 cm
  • Sea Temperature Range: 24.1-31.2°C
  • Depth: 1-30m
  • Habitat: Coral Reef
  • Habitat Generalisation Index: 19
    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 (26% 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: Joe Shields
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