HomeFish encyclopediaRay-finned fishesFlatfishesLarge-tooth floundersDusky flounder Dusky flounder (Syacium papillosum) Scientific name: Syacium papillosum Linnaeus, 1758 The Dusky flounder (Syacium papillosum) is a marine fish of the family Paralichthyidae. Native range: Western Atlantic, North Carolina, USA and northern Gulf of Mexico to Brazil. Eastern Atlantic: Ascension Island. BiologyPredator which lives on the bottom where it hides partially or almost completely in the sand in order to disguise itself in the environment. Feeds on small fish and invertebrates. Exhibits sexual dimorphism. Marketed fresh.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSyacium papillosumFamilyParalichthyidae (Large-tooth flounders)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length30.0Common length20.0Depth range10–140 m (33–459 ft)EnvironmentMarine; reef-associated; depth range 10 - 140 m, usually 10 - 90 mClimateTropicalDistributionWestern Atlantic: North Carolina, USA and northern Gulf of Mexico to Brazil. Eastern Atlantic: Ascension Island.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: minor commercialResilienceHigh, 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