HomeFish encyclopediaRay-finned fishesScorpionfishes and FlatheadsRockfishes, rockcods and thornyheadsLongspine thornyhead Longspine thornyhead (Sebastolobus altivelis) Scientific name: Sebastolobus altivelis Gilbert, 1896 The Longspine thornyhead (Sebastolobus altivelis) is a marine fish of the family Sebastidae. Native range: Eastern Pacific, Aleutian Islands, Alaska to southern Baja California, Mexico. BiologyAdults occur on soft bottom of offshore waters. Juveniles occur in midwater. Oviparous. Eggs are spawned in pelagic gelatinous masses.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSebastolobus altivelisFamilySebastidae (Rockfishes, rockcods and thornyheads)OrderScorpaeniformes (Scorpionfishes and Flatheads)ClassActinopterygii (Ray-finned fishes)Maximum length39.0Depth range201–1757 m (659–5764 ft)EnvironmentMarine; bathydemersal; depth range 201 - 1757 mClimateDeep-waterDistributionEastern Pacific: Aleutian Islands, Alaska to southern Baja California, Mexico.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceLow, minimum population doubling time 4.5 - 14 years (tm=6; tmax=45 (validate age: 27 yrs)) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026