HomeMarine aquarium fishOther marine fishSwellshark Swellshark (Cephaloscyllium ventriosum) Scientific name: Cephaloscyllium ventriosum Garman, 1880 The Swellshark (Cephaloscyllium ventriosum) is a marine fish of the family Scyliorhinidae. Native range: Eastern Pacific, central California, USA to the Gulf of California and southern Mexico; central Chile. BiologyFound on the continental shelves and upper slopes from inshore to deeper waters. Prefers rocky, algal-covered areas of kelp beds. Nocturnal. Feeds on bony fishes, alive and dead, and probably crustaceans. Can inflate its stomach with water or air. Oviparous. Can live in tanks for several years and females can lay eggs in captivity. Occurs in aggregations while resting, sometimes piled one on top of the other. Sometimes caught by sport divers but not used.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameCephaloscyllium ventriosumFamilyScyliorhinidae (Cat sharks)OrderCarcharhiniformes (Ground sharks)ClassElasmobranchii (Sharks and Rays)Maximum length100.0Depth range457 m (1499 ft)EnvironmentMarine; demersal; depth range ? - 457 m, usually 5 - 37 mClimateSubtropicalDistributionEastern Pacific: central California, USA to the Gulf of California and southern Mexico; central Chile.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessUsesFisheries: of no interest; gamefish: yes; aquarium: public aquariumsResilienceLow, minimum population doubling time 4.5 - 14 years (Fec assumed to be More other marine fishLined catsharkHalaelurus lineatusSmall-spotted catsharkScyliorhinus caniculaNursehoundScyliorhinus stellarisSouthern fiddlerTrygonorrhina fasciataZebra bullhead sharkHeterodontus zebraWhitespotted bullhead sharkHeterodontus ramalheiraSee 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