HomeFish encyclopediaRay-finned fishesFlatfishesRighteye floundersStone flounder Stone flounder (Kareius bicoloratus) Scientific name: Kareius bicoloratus Basilewsky, 1855 The Stone flounder (Kareius bicoloratus) is a freshwater fish of the family Pleuronectidae. Native range: Northwest Pacific, Japan and its adjacent freshwaters, the Kuril Islands, Sakhalin, Korean Peninsula, northern China and Taiwan. BiologyInhabits sandy and muddy bottoms in coastal areas.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameKareius bicoloratusFamilyPleuronectidae (Righteye flounders)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length50.0Depth range150 m (492 ft)EnvironmentMarine; freshwater; brackish; demersal; oceanodromous; depth range ? - 150 mClimateTemperateDistributionNorthwest Pacific: Japan and its adjacent freshwaters, the Kuril Islands, Sakhalin, Korean Peninsula, northern China and Taiwan.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (K=0.17-0.41; tmax=12) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026