HomeFish encyclopediaRay-finned fishesFlatfishesTonguefishesBlack cow-tongue Black cow-tongue (Paraplagusia japonica) Scientific name: Paraplagusia japonica Temminck & Schlegel, 1846 The Black cow-tongue (Paraplagusia japonica) is a marine fish of the family Cynoglossidae. Native range: Western Pacific, Japan and Korea to Taiwan and Papua New Guinea. BiologyDorsal soft rays (total): 105-119; Anal soft rays: 84 - 97. Caudal vertebrae 41-44; mid-lateral line scales 88-110.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameParaplagusia japonicaFamilyCynoglossidae (Tonguefishes)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length35.0Depth range20–65 m (66–213 ft)EnvironmentMarine; demersal; depth range 20 - 65 mClimateTropicalDistributionWestern Pacific: Japan and Korea to Taiwan and Papua New Guinea.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