HomeFish encyclopediaRay-finned fishesSmeltsBarreleyes or spookfishesBarrel-eye Barrel-eye (Opisthoproctus soleatus) Scientific name: Opisthoproctus soleatus Vaillant, 1888 The Barrel-eye (Opisthoproctus soleatus) is a marine fish of the family Opisthoproctidae. Native range: Circumglobal in tropical to temperate waters. Eastern Atlantic, western Ireland to Mauritania and from Sierra Leone to Angola. South China Sea. BiologyMesopelagic. Probably not exhibiting vertical migration. The limits of its distribution coincide with the 400m-isotherm for 8?C.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameOpisthoproctus soleatusFamilyOpisthoproctidae (Barreleyes or spookfishes)OrderOsmeriformes (Smelts)ClassActinopterygii (Ray-finned fishes)Maximum length10.5Depth range300–800 m (984–2625 ft)EnvironmentMarine; bathypelagic; depth range 300 - 800 m, usually 500 - 700 mClimateDeep-waterDistributionCircumglobal in tropical to temperate waters. Eastern Atlantic: western Ireland to Mauritania and from Sierra Leone to Angola. South China SeaConservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interestResilienceHigh, minimum population doubling time less than 15 months (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