HomeFish encyclopediaSharks and RaysElectric raysCoffin raysAustralian numbfish Australian numbfish (Hypnos monopterygius) Scientific name: Hypnos monopterygius Shaw, 1795 The Australian numbfish (Hypnos monopterygius) is a marine fish of the family Hypnidae. Native range: Indo-West Pacific, endemic to Australia. BiologyOccurs inshore and offshore, ranging from the intertidal to 240 m depth. Found buried on sand and mud bottoms; sometimes found stranded out of water by the tide but is capable of surviving for hours. Feeds on crabs, worms, and fishes. Ovoviviparous. A slow-moving species which uses its electric organs to stun prey. Also stuns people when accidentally stepped upon or handled. Maximum length probably to 92 cm TL.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameHypnos monopterygiusFamilyHypnidae (Coffin rays)OrderTorpediniformes (Electric rays)ClassElasmobranchii (Sharks and Rays)Maximum length70.0Common length40.0Depth range240 m (787 ft)EnvironmentMarine; reef-associated; depth range ? - 240 mClimateTemperateDistributionIndo-West Pacific: endemic to Australia.Conservation status (IUCN)Least Concern (LC)Threat to humansOtherUsesFisheries: of no interestResilienceVery Low, minimum population doubling time more than 14 years (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