HomeFish encyclopediaRay-finned fishesFlatfishesRighteye floundersFlathead flounder Flathead flounder (Hippoglossoides dubius) Scientific name: Hippoglossoides dubius Schmidt, 1904 The Flathead flounder (Hippoglossoides dubius) is a marine fish of the family Pleuronectidae. Native range: Northwest Pacific, Sea of Japan and Sea of Okhotsk, Kamchatka and Korea. Species factsScientific nameHippoglossoides dubiusFamilyPleuronectidae (Righteye flounders)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length45.0Depth range10–600 m (33–1969 ft)EnvironmentMarine; demersal; oceanodromous; depth range 10 - 600 mClimateTemperateDistributionNorthwest Pacific: Sea of Japan and Sea of Okhotsk, Kamchatka and Korea.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: commercialResilienceLow, minimum population doubling time 4.5 - 14 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