Acanthurus olivaceus

Acanthuridae
Orange-blotch Surgeonfish, Gendarme Fish, Olive Surgeonfish, Orange-epaulette Surgeonfish, Orangeband Surgeonfish, Orangebar Surgeonfish, Orangespot Surgeonfish, Orangespot Tang
  • Acanthurus olivaceus, Adult, NSW, Australia, Photo: Ian Shaw
    Acanthurus olivaceus, Adult, NSW, Australia, Photo: Ian Shaw
  • Acanthurus olivaceus, Juvenile, NSW, Australia, Photo: Ian Shaw
    Acanthurus olivaceus, Juvenile, NSW, Australia, Photo: Ian Shaw
  • Acanthurus olivaceus, Adult, Dark phase, Bali, Indonesia, Photo: Ian Shaw
    Acanthurus olivaceus, Adult, Dark phase, Bali, Indonesia, Photo: Ian Shaw
Distribution
Temperate Australasia, Tropical Indo-Pacific
Description
Oval-shaped body with a rounded head. Pale grey front half of body, dark rear half, broad black-edged orange streak behind eye, black tail spine, and lunate tail. Juveniles yellow, with a faint trace of an orange streak behind eye. Similar to other yellow juvenile surgeons and best distinguished by presence of adults.
Information
  • Max Size: 35 cm
  • Sea Temperature Range: 17.4-31.3°C
  • Depth: 3-46m
  • Habitat: Coral Reef, Rocky Reef
  • Habitat Generalisation Index: 18.8
    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: Frequent (12% 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 (5 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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