HomeFish encyclopediaSharks and RaysBramble, Sleeper and Dogfish sharksSleeper sharksLittle sleeper shark Little sleeper shark (Somniosus rostratus) Scientific name: Somniosus rostratus Risso, 1827 The Little sleeper shark (Somniosus rostratus) is a marine fish of the family Somniosidae. Native range: Northeast Atlantic, Madeira, France, and western Mediterranean. BiologyA rare species found on outer continental shelves and upper slopes. Probably feeds on deepwater bottom fishes and invertebrates. Ovoviviparous, length at birth 21-28 cm TL. Utilized as fishmeal and possibly as food fish.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSomniosus rostratusFamilySomniosidae (Sleeper sharks)OrderSqualiformes (Bramble, Sleeper and Dogfish sharks)ClassElasmobranchii (Sharks and Rays)Maximum length143Common length100.0Depth range200–1000 m (656–3281 ft)EnvironmentMarine; bathydemersal; depth range 200 - 1000 mClimateDeep-waterDistributionNortheast Atlantic: Madeira, France, and western Mediterranean.Conservation status (IUCN)Data deficient (DD)Threat to humansHarmlessUsesFisheries: minor commercialResilienceLow, minimum population doubling time 4.5 - 14 years (Fec assumed to be SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026