Night Surgeonfish, Thompson's Surgeonfish, Thompson's Tang, Chocolate Surgeonfish, Night Surgeonfish, Whitetail Surgeonfish
Acanthurus thompsoni, Maldives, Photo: Rick Stuart-Smith
Acanthurus thompsoni, Niue, Photo: Graham Edgar
Acanthurus thompsoni, Aceh, Indonesia, Photo: Graham Edgar
Temperate Australasia, Tropical Indo-Pacific
Uniformly dark, oval-shaped body with a lunate, white tail and a rounded head with dark spots. Forms schools which feed on plankton in the water column, well above the reef.
Max Size: 27 cm
Sea Temperature Range: 22.6-31.2°C
Habitat: Coral Reef
Habitat Generalisation Index: 14.8
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
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: Many (13 per transect)
Abundance is calculated as the average number of individuals recorded per RLS transect, where present.