Ctenochaetus binotatus

Acanthuridae
Two-spot Surgeonfish, Twospot Bristletooth, Twospot Surgeonfish
  • Ctenochaetus binotatus, Bali, Indonesia, Photo: Ian Shaw
    Ctenochaetus binotatus, Bali, Indonesia, Photo: Ian Shaw
  • Ctenochaetus binotatus, Juvenile. Photo: Rick Stuart-Smith
    Ctenochaetus binotatus, Juvenile. Photo: Rick Stuart-Smith
  • Ctenochaetus binotatus, Photo: Rick Stuart-Smith
    Ctenochaetus binotatus, Photo: Rick Stuart-Smith
  • Ctenochaetus binotatus, Tanzania, Photo: Rick Stuart-Smith
    Ctenochaetus binotatus, Tanzania, Photo: Rick Stuart-Smith
  • Ctenochaetus binotatus, Juvenile, QLD, Australia, Photo: Rick Stuart-Smith
    Ctenochaetus binotatus, Juvenile, QLD, Australia, Photo: Rick Stuart-Smith
  • Ctenochaetus binotatus, Juvenile, NSW, Australia, Photo: Tom Davis
    Ctenochaetus binotatus, Juvenile, NSW, Australia, Photo: Tom Davis
Distribution
Tropical Indo-Pacific
Description
Brown body with pale lines, blue ring around eye, pale spots on head and chest, lunate tail and dark spots above and below tail base. Blue eye best distinguishes it from similar C. striatus (Lined Bristletooth), C. cyanocheilus (Yelloweye Bristletooth), Acanthurus nigrofuscus (Dusky Surgeonfish) and A. nigroris (Greyhead Surgeonfish). Very common.
Information
  • Max Size: 22 cm
  • Sea Temperature Range: 22.0-31.3°C
  • Depth: 8-53 m
  • Habitat: Coral Reef, Rocky Reef
  • Habitat Generalisation Index: 26.1
    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 (29% 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: Many (10 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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