HomeFish encyclopediaRay-finned fishesCodsGrenadiers or rattailsUnicorn grenadier Unicorn grenadier (Coelorinchus productus) Scientific name: Coelorinchus productus Gilbert & Hubbs, 1916 The Unicorn grenadier (Coelorinchus productus) is a marine fish of the family Macrouridae. Native range: Western Pacific, southern Japan, the East China Sea, and northern Taiwan. BiologyDorsal spines (total): 2; Anal spines: 0. Head large; the eyes moderately large; the snout moderately long and pointed, its anterolateral margin completely supported by bone. Head ridges strong, supraoccipital scute developed, several similar single-keeled scutes follow on the nape; the underside of the head naked, except for a small patch below the preopercle angle. Body scales covered with dagger-like spinules in 3 to 5 slightly divergent rows. Light organ small, fossa narrow, extending forward immediately before the anus. Overall brownish to swarthy, silvery ventrally; the fins dusky to blackish; the mouth and gill cavities blackish.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameCoelorinchus productusFamilyMacrouridae (Grenadiers or rattails)OrderGadiformes (Cods)ClassActinopterygii (Ray-finned fishes)Maximum length31.0Depth range271–600 m (889–1969 ft)EnvironmentMarine; bathydemersal; non-migratory; depth range 271 - 600 mClimateDeep-waterDistributionWestern Pacific: southern Japan, the East China Sea, and northern Taiwan.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: minor 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