HomeMarine aquarium fishTangs & surgeonfishOcean surgeon Ocean surgeon (Acanthurus bahianus) Scientific name: Acanthurus bahianus Castelnau, 1855 The Ocean surgeon (Acanthurus bahianus) is a marine fish of the family Acanthuridae. In the aquarium it needs water at 21–25°C (70–77°F). Ocean surgeon care at a glanceTemperature21–25°C (70–77°F) BiologyInhabits shallow bottoms with coral or rocky formations. Usually occurs in groups of five or more individuals. Mainly diurnal species. Feeds on algae. The spine on both sides of the caudal peduncle may inflict painful wounds. Marketed fresh. Minimum depth reported from.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAcanthurus bahianusFamilyAcanthuridae (Surgeonfishes, tangs, unicornfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length38.1Common length25.0Depth range2–40 m (7–131 ft)EnvironmentMarine; reef-associated; depth range 2 - 40 m, usually 2 - 25 mClimateTropicalDistributionWestern Atlantic: Massachusetts, USA and Bermuda southward to the Gulf of Mexico (except in the northeast) and Brazil. Eastern Atlantic: Ascension and St. Helena islands off Angola. A recent record from Seychelles is probably a locality error.Conservation status (IUCN)Not EvaluatedThreat to humansTraumatogenicUsesFisheries: minor commercial; aquarium: commercial; bait: occasionallyResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.) More tangs & surgeonfishDoctorfishAcanthurus chirurgusBlue tang surgeonfishAcanthurus coeruleusScalpel sawtailPrionurus scalprumSpotted tangZebrasoma gemmatumOneknife unicornfishNaso thynnoidesBignose unicornfishNaso vlamingiiSee all tangs & surgeonfish SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026