HomeFish encyclopediaRay-finned fishesPuffers and FilefishesFilefishesJapanese leatherjacket Japanese leatherjacket (Paramonacanthus nipponensis) Scientific name: Paramonacanthus nipponensis Kamohara, 1939 The Japanese leatherjacket (Paramonacanthus nipponensis) is a marine fish of the family Monacanthidae. Native range: Western Pacific, off Kochi Prefecture, Japan and the East China Sea. Also known from the Philippines. BiologyInhabits deep muddy substrates from about 30 meters depth, but some individuals were found drifting with large Sargassum rafts over deep water, well away from the shore.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameParamonacanthus nipponensisFamilyMonacanthidae (Filefishes)OrderTetraodontiformes (Puffers and Filefishes)ClassActinopterygii (Ray-finned fishes)Maximum length15.0Depth range1–30 m (3–98 ft)EnvironmentMarine; reef-associated; depth range 1 - 30 mClimateTropicalDistributionWestern Pacific: off Kochi Prefecture, Japan and the East China Sea. Also known from the Philippines.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, 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