HomeFish encyclopediaRay-finned fishesFlatfishesTonguefishesWilliam's tonguefish William's tonguefish (Symphurus williamsi) Scientific name: Symphurus williamsi Jordan & Culver, 1895 The William's tonguefish (Symphurus williamsi) is a marine fish of the family Cynoglossidae. Native range: Eastern Pacific, Gulf of California to Peru. BiologyDorsal spines (total): 0; Dorsal soft rays (total): 89-95; Anal spines: 0; Anal soft rays: 73 - 79; Vertebrae: 47 - 51Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSymphurus williamsiFamilyCynoglossidae (Tonguefishes)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length11.6Common length7.5Depth range0–52 m (0–171 ft)EnvironmentMarine; demersal; depth range 0 - 52 m, usually 0 - 30 mClimateTropicalDistributionEastern Pacific: Gulf of California to Peru.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