HomeFreshwater aquarium fishOther freshwater fishEpaulette surgeonfish Epaulette surgeonfish (Acanthurus nigricauda) Scientific name: Acanthurus nigricauda Duncker & Mohr, 1929 The Epaulette surgeonfish (Acanthurus nigricauda) is a brackish-water fish of the family Acanthuridae. In the aquarium it needs water at 23–28°C (73–82°F). Epaulette surgeonfish care at a glanceTemperature23–28°C (73–82°F) BiologyDorsal spines (total): 9; Dorsal soft rays (total): 25-28; Anal spines: 3; Anal soft rays: 23 - 26. Color in life dark brown without lines on body or spots on head (one phase is purplish grey); horizontal black band behind upper gill opening absent on juvenilesSource: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAcanthurus nigricaudaFamilyAcanthuridae (Surgeonfishes, tangs, unicornfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length40.0Depth range1–30 m (3–98 ft)EnvironmentMarine; brackish; reef-associated; depth range 1 - 30 m, usually 2 - 15 mClimateTropicalDistributionIndo-Pacific: East Africa, including the Mascarene Islands to the Tuamoto Islands, north to Ryukyu Islands, south to southern Great Barrier Reef. Not occurring in the Red Sea.Conservation status (IUCN)Not EvaluatedThreat to humansPoisonous to eatUsesFisheries: commercial; aquarium: commercialResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) More other freshwater fishLined soleAchirus lineatusPumpkinseedLepomis gibbosusShort-tailed pipefishMicrophis brachyurus brachyurusFinescale tigerfishDatnioides microlepisFreshwater garfishXenentodon cancilaSouth American lungfishLepidosiren paradoxaSee all other freshwater fish SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026