HomeFish encyclopediaRay-finned fishesPerch-like fishSurgeonfishes, tangs, unicornfishesSquarenose unicornfish Squarenose unicornfish (Naso mcdadei) Scientific name: Naso mcdadei Johnson, 2002 The Squarenose unicornfish (Naso mcdadei) is a marine fish of the family Acanthuridae. Native range: Indo-West Pacific, East Africa to the Great Barrier Reef, including the Timor Sea. BiologyDorsal spines (total): 5; Dorsal soft rays (total): 28-31; Anal spines: 2; Anal soft rays: 26 - 29Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameNaso mcdadeiFamilyAcanthuridae (Surgeonfishes, tangs, unicornfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length75.0Depth range5–65 m (16–213 ft)EnvironmentMarine; reef-associated; depth range 5 - 65 mClimateTropicalDistributionIndo-West Pacific: East Africa to the Great Barrier Reef, including the Timor Sea.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceLow, minimum population doubling time 4.5 - 14 years (Preliminary K or Fecundity.) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026