HomeFish encyclopediaRay-finned fishesPerch-like fishSea basses: groupers and fairy bassletsHarlequin fish Harlequin fish (Othos dentex) Scientific name: Othos dentex Cuvier, 1828 The Harlequin fish (Othos dentex) is a marine fish of the family Serranidae. Native range: Eastern Indian Ocean, Endemic to Australian waters (South Australia and Western Australia). BiologyFound on rocky reefs. Feeds on various small fish.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameOthos dentexFamilySerranidae (Sea basses: groupers and fairy basslets)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length75.0Depth range30 m (98 ft)EnvironmentMarine; reef-associated; depth range ? - 30 mClimateSubtropicalDistributionEastern Indian Ocean: Endemic to Australian waters (South Australia and Western Australia).Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: minor commercialResilienceLow, 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