Acanthurus nigrofuscusBrown surgeonfish | Blackspot Surgeonfish | Dusky Surgeonfish | Lavender Tang | Spot-cheeked Surgeonfish
Temperate Australasia, Tropical Indo-Pacific
Bluish-brown body, slightly concave head profile, round black spots above and below tail base, orange spots on head, dorsal and anal fins with light blue margin. Similar A. nigroris (Greyhead Surgeonfish) has lines rather than spots on face, and Ctenochaetus striatus (Lined Bristletooth) lacks spots on tail base. Very common on sheltered reefs and bommies.
Max Size: 21 cm
Sea Temperature Range: 20.1-30.8°C
Habitat Generalization Index: 25.18
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.
Conservation and Rarity
IUCN Status: Least Concern
Occurrence: Common (31.7% 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 (21 per transect)
Abundance is calculated as the average number of individuals recorded per RLS transect, where present.
Edit by: Joe Shields