HomeFish encyclopediaRay-finned fishesFlatfishesRighteye floundersWillowy flounder Willowy flounder (Tanakius kitaharae) Scientific name: Tanakius kitaharae Jordan & Starks, 1904 The Willowy flounder (Tanakius kitaharae) is a marine fish of the family Pleuronectidae. Native range: Northwest Pacific, Southern Hokkaido, Japan to the Yellow Sea, Gulf of Bo Hai, East China Sea and Taiwan. Species factsScientific nameTanakius kitaharaeFamilyPleuronectidae (Righteye flounders)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length30.0Depth range100–200 m (328–656 ft)EnvironmentMarine; demersal; depth range 100 - 200 mClimateTemperateDistributionNorthwest Pacific: Southern Hokkaido, Japan to the Yellow Sea, Gulf of Bo Hai, East China Sea and Taiwan.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: commercialResilienceLow, minimum population doubling time 4.5 - 14 years (K=0.14-0.18) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026