HomeFish encyclopediaRay-finned fishesSawbelliesSlimeheadsWestern roughy Western roughy (Hoplostethus occidentalis) Scientific name: Hoplostethus occidentalis Woods, 1973 The Western roughy (Hoplostethus occidentalis) is a marine fish of the family Trachichthyidae. BiologyDorsal spines: 6; Dorsal soft rays: 13; Anal spines: 3; Anal soft rays: 9. Pectoral fin long, its tip extending beyond anal fin origin. Scales adherent, spinules small, margins serrate, spines on fin rays small. Denticles on head bones small, septae relatively strong.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameHoplostethus occidentalisFamilyTrachichthyidae (Slimeheads)OrderBeryciformes (Sawbellies)ClassActinopterygii (Ray-finned fishes)Maximum length17.3Depth range485–550 m (1591–1804 ft)EnvironmentMarine; bathypelagic; depth range 485 - 550 mClimateDeep-waterDistributionAtlantic Ocean: southern Nova Scotia south to the northern part of the Gulf of Mexico, on the eastern seaboard of Florida, in the Bahama, in the west and southern Caribbean, and around Venezuela, Guyana, Suriname, Tobago and Brazil.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interestResilienceLow, 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