HomeFish encyclopediaRay-finned fishesFlatfishesTonguefishesSpotfin tonguefish Spotfin tonguefish (Symphurus oligomerus) Scientific name: Symphurus oligomerus Mahadeva & Munroe, 1990 The Spotfin tonguefish (Symphurus oligomerus) 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): 85-97; Anal spines: 0; Anal soft rays: 71 - 83; Vertebrae: 48 - 52Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSymphurus oligomerusFamilyCynoglossidae (Tonguefishes)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length14.6Common length12.0Depth range80–300 m (262–984 ft)EnvironmentMarine; bathydemersal; depth range 80 - 300 m, usually 110 - 300 mClimateDeep-waterDistributionEastern Pacific: Gulf of California to Peru.Conservation status (IUCN)Least Concern (LC)Threat 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