HomeFish encyclopediaRay-finned fishesFlatfishesTonguefishesMargined tonguefish Margined tonguefish (Symphurus marginatus) Scientific name: Symphurus marginatus Goode & Bean, 1886 The Margined tonguefish (Symphurus marginatus) is a marine fish of the family Cynoglossidae. BiologyOften found in deepwater soft mud substrates on outer continental shelf and upper continental slope.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSymphurus marginatusFamilyCynoglossidae (Tonguefishes)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length14.6Depth range37–750 m (121–2461 ft)EnvironmentMarine; bathydemersal; depth range 37 - 750 m, usually 320 - 550 mClimateDeep-waterDistributionWestern Atlantic: off New Jersey southward along eastern United States, Gulf of Mexico, off the Bahamas, the Greater Antilles at Puerto Rico, throughout southern Caribbean Sea from Honduras to Venezuela, and from Trinidad and Tobago to southeastern Brazil.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Assuming tmax>3) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026