HomeFish encyclopediaRay-finned fishesFlatfishesLarge-tooth floundersBastard halibut Bastard halibut (Paralichthys olivaceus) Scientific name: Paralichthys olivaceus Temminck & Schlegel, 1846 The Bastard halibut (Paralichthys olivaceus) is a marine fish of the family Paralichthyidae. Native range: Western Pacific, Japan, Sakhalin, Kuril Islands, Korean Peninsula to the South China Sea. BiologyMost highly prized of the Japanese flounders.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameParalichthys olivaceusFamilyParalichthyidae (Large-tooth flounders)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length103Depth range10–200 m (33–656 ft)EnvironmentMarine; demersal; oceanodromous; depth range 10 - 200 mClimateSubtropicalDistributionWestern Pacific: Japan, Sakhalin, Kuril Islands, Korean Peninsula to the South China Sea.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: highly commercial; aquaculture: commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (tm=3; Fec= 3 million) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026