HomeMarine aquarium fishOther marine fishFinless sleeper ray Finless sleeper ray (Temera hardwickii) Scientific name: Temera hardwickii Gray, 1831 The Finless sleeper ray (Temera hardwickii) is a marine fish of the family Narkidae. BiologyFound in continental waters, both inshore and offshore. Biology little known.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameTemera hardwickiiFamilyNarkidae (Sleeper rays)OrderTorpediniformes (Electric rays)ClassElasmobranchii (Sharks and Rays)Maximum length46.0EnvironmentMarine; demersalClimateTropicalDistributionIndo-West Pacific: Andaman Sea near the southern Thai- Burma border through the Straits of Malacca and the Malay Peninsula to Singapore and Viet Nam, occurs off Thailand but coast and locality is uncertain.Conservation status (IUCN)Vulnerable (VU) (A4d)Threat to humansOtherUsesAquarium: public aquariumsResilienceLow, minimum population doubling time 4.5 - 14 years (Assuming fecundity More other marine fishGreen jobfishAprion virescensGungo highhatPareques violaMexican blennyParaclinus mexicanusTrout sweetlipsPlectorhinchus pictusSpotwing flying gurnardDactyloptena macracanthaPineapplefishCleidopus gloriamarisSee 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