HomeFish encyclopediaRay-finned fishesSmeltsSlickheadsSlickhead Slickhead (Alepocephalus umbriceps) Scientific name: Alepocephalus umbriceps Jordan & Thompson, 1914 The Slickhead (Alepocephalus umbriceps) is a marine fish of the family Alepocephalidae. Native range: Northwest Pacific, Hokkaido, Japan to the East China Sea. BiologyDorsal spines (total): 0; Dorsal soft rays (total): 17-18; Anal spines: 0; Anal soft rays: 17 - 18. Body nearly cylindrical anteriorly, but compressed posteriorly. Head large, more than one-third of SL in length. Maxillary extending to middle of eye. Scales small, more than 65 in lateral line. Jet black head entirely naked.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAlepocephalus umbricepsFamilyAlepocephalidae (Slickheads)OrderOsmeriformes (Smelts)ClassActinopterygii (Ray-finned fishes)Maximum length63.0Depth range500–2000 m (1640–6562 ft)EnvironmentMarine; bathydemersal; depth range 500 - 2000 mClimateDeep-waterDistributionNorthwest Pacific: Hokkaido, Japan to the East China Sea.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceVery Low, minimum population doubling time more than 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