HomeFish encyclopediaRay-finned fishesSmeltsSlickheadsCalifornia slickhead California slickhead (Alepocephalus tenebrosus) Scientific name: Alepocephalus tenebrosus Gilbert, 1892 The California slickhead (Alepocephalus tenebrosus) is a marine fish of the family Alepocephalidae. Native range: North Pacific, Bering Sea to at least California, USA. Southeast Pacific: Chile. BiologyDorsal spines (total): 0; Dorsal soft rays (total): 15-18; Anal spines: 0; Anal soft rays: 15 - 18; Vertebrae: 51 - 55. Branchiostegal rays: 6-7.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAlepocephalus tenebrosusFamilyAlepocephalidae (Slickheads)OrderOsmeriformes (Smelts)ClassActinopterygii (Ray-finned fishes)Maximum length61.0Depth range46–5500 m (151–18045 ft)EnvironmentMarine; bathydemersal; depth range 46 - 5500 mClimateDeep-waterDistributionNorth Pacific: Bering Sea to at least California, USA. Southeast Pacific: Chile.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (K=0.30) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026