HomeFish encyclopediaRay-finned fishesFlatfishesTonguefishesGiant tonguefish Giant tonguefish (Symphurus megasomus) Scientific name: Symphurus megasomus Lee, Chen & Shao, 2009 The Giant tonguefish (Symphurus megasomus) is a marine fish of the family Cynoglossidae. Native range: Northwest Pacific, Taiwan. BiologyThis deep-water tonguefish species is known only from the continental shelf and upper continental slope off northeastern and eastern Taiwan; from 471-640 m by research vessels. Polychaetes, small crustaceans and some unidentified detritus were found in the digestive systems of fishes examined. Little else is known regarding the biology of this species.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSymphurus megasomusFamilyCynoglossidae (Tonguefishes)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length14.7Depth range200–640 m (656–2100 ft)EnvironmentMarine; benthopelagic; depth range 200 - 640 mClimateSubtropicalDistributionNorthwest Pacific: Taiwan.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 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