HomeFish encyclopediaSharks and RaysElectric raysSleeper raysSleeper torpedo Sleeper torpedo (Crassinarke dormitor) Scientific name: Crassinarke dormitor Takagi, 1951 The Sleeper torpedo (Crassinarke dormitor) is a marine fish of the family Narkidae. Native range: Western Pacific, southern Japan to the South China Sea. Species factsScientific nameCrassinarke dormitorFamilyNarkidae (Sleeper rays)OrderTorpediniformes (Electric rays)ClassElasmobranchii (Sharks and Rays)Depth range80 m (262 ft)EnvironmentMarine; demersal; depth range 80 - 80 mClimateTemperateDistributionWestern Pacific: southern Japan to the South China Sea.Conservation status (IUCN)Data deficient (DD)Threat to humansHarmlessResilienceLow, minimum population doubling time 4.5 - 14 years (Assuming fecundity SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026