HomeFish encyclopediaRay-finned fishesFlatfishesTonguefishesSmallscale tonguesole Smallscale tonguesole (Cynoglossus microlepis) Scientific name: Cynoglossus microlepis Bleeker, 1851 The Smallscale tonguesole (Cynoglossus microlepis) is a freshwater fish of the family Cynoglossidae. Native range: Asia, Thailand to Viet Nam, Borneo, and Sumatra. BiologyDorsal soft rays (total): 117-119; Anal soft rays: 92 - 96. Plain dark brown on the eye-side of body; body depth 4.3-5.0 times in SL; 21-22 scale rows between 2 lateral lines; with a single pelvic fin.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameCynoglossus microlepisFamilyCynoglossidae (Tonguefishes)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length32.5EnvironmentFreshwater; demersal; potamodromousClimateTropicalDistributionAsia: Thailand to Viet Nam, Borneo, and Sumatra.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: commercialResilienceMedium, 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