HomeFish encyclopediaRay-finned fishesFlatfishesLarge-tooth floundersLongfin flounder Longfin flounder (Syacium longidorsale) Scientific name: Syacium longidorsale Murakami & Amaoka, 1992 The Longfin flounder (Syacium longidorsale) is a marine fish of the family Paralichthyidae. Native range: Eastern Pacific, Ecuador. Also reported from Colombia. Species factsScientific nameSyacium longidorsaleFamilyParalichthyidae (Large-tooth flounders)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length15.0Depth range13–38 m (43–125 ft)EnvironmentMarine; demersal; depth range 13 - 38 mClimateTropicalDistributionEastern Pacific: Ecuador. Also reported from Colombia.Conservation status (IUCN)Least Concern (LC)Threat 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