HomeFish encyclopediaRay-finned fishesSmeltsSlickheadsBicolor slickhead Bicolor slickhead (Alepocephalus bicolor) Scientific name: Alepocephalus bicolor Alcock, 1891 The Bicolor slickhead (Alepocephalus bicolor) is a marine fish of the family Alepocephalidae. Native range: Indo-Pacific, ranging to the Ryukyu Trough. BiologyDorsal spines (total): 0; Dorsal soft rays (total): 21-22; Anal spines: 0; Anal soft rays: 28 - 29. Pored scales in lateral line more than 60. Anal fin rays numerous. Base of anal fin extending backward much beyond the posterior end of the dorsal fin. Orbit diameter less than two-thirds of snout length. Reaches 24 cm SL.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAlepocephalus bicolorFamilyAlepocephalidae (Slickheads)OrderOsmeriformes (Smelts)ClassActinopterygii (Ray-finned fishes)Maximum length29.0Depth range439–1080 m (1440–3543 ft)EnvironmentMarine; bathydemersal; depth range 439 - 1080 mClimateDeep-waterDistributionIndo-Pacific: ranging to the Ryukyu Trough.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