HomeFish encyclopediaRay-finned fishesScorpionfishes and FlatheadsSnailfishesBigtail snailfish Bigtail snailfish (Osteodiscus cascadiae) Scientific name: Osteodiscus cascadiae Stein, 1978 The Bigtail snailfish (Osteodiscus cascadiae) is a marine fish of the family Liparidae. Native range: Northeast Pacific, British Columbia, Canada to at least Oregon, USA. BiologyDorsal spines (total): 0; Dorsal soft rays (total): 47-52; Anal spines: 0; Anal soft rays: 40 - 44; Vertebrae: 51 - 56Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameOsteodiscus cascadiaeFamilyLiparidae (Snailfishes)OrderScorpaeniformes (Scorpionfishes and Flatheads)ClassActinopterygii (Ray-finned fishes)Maximum length7.4Depth range1900–3000 m (6234–9843 ft)EnvironmentMarine; bathydemersal; depth range 1900 - 3000 mClimateDeep-waterDistributionNortheast Pacific: British Columbia, Canada to at least Oregon, USA.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceHigh, 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