HomeMarine aquarium fishOther marine fishGiant kelpfish Giant kelpfish (Heterostichus rostratus) Scientific name: Heterostichus rostratus Girard, 1854 The Giant kelpfish (Heterostichus rostratus) is a marine fish of the family Clinidae. Native range: Eastern Pacific, California, USA to southern Baja California, Mexico including Guadalupe Island. BiologyFound among rocks with large seaweeds, often in kelp. Young occur in schools while adults are solitary. Feeds on small crustaceans, mollusks and small fishes. Female attaches eggs to seaweeds, male guards them.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameHeterostichus rostratusFamilyClinidae (Clinids)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length61.0Depth range40 m (131 ft)EnvironmentMarine; demersal; depth range ? - 40 mClimateSubtropicalDistributionEastern Pacific: California, USA to southern Baja California, Mexico including Guadalupe Island.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesAquarium: commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (tm=1.25; tmax=4) More other marine fishWrasse blennyHemiemblemaria simulusHairy blennyLabrisomus nuchipinnisPirate blennyEmblemaria piratulaRosy blennyMalacoctenus macropusSailfin blennyEmblemaria pandionisSaddled blennyMalacoctenus triangulatusSee all other marine fish SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026