HomeFish encyclopediaRay-finned fishesFlatfishesAmerican solesNaked sole Naked sole (Gymnachirus nudus) Scientific name: Gymnachirus nudus Kaup, 1858 The Naked sole (Gymnachirus nudus) is a marine fish of the family Achiridae. Native range: Western Atlantic, Mexico to Rio Grande do Sul, Brazil. BiologyDorsal spines (total): 0; Dorsal soft rays (total): 61-69; Anal spines: 0; Anal soft rays: 44 - 50. Pectorals reduced to 1 or 2 rudimentary rays.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameGymnachirus nudusFamilyAchiridae (American soles)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length15.0Common length12.0Depth range37–100 m (121–328 ft)EnvironmentMarine; demersal; depth range 37 - 100 mClimateTropicalDistributionWestern Atlantic: Mexico to Rio Grande do Sul, Brazil.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceHigh, minimum population doubling time less than 15 months (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