HomeFish encyclopediaRay-finned fishesCodsGrenadiers or rattailsSlender grenadier fish Slender grenadier fish (Hymenocephalus tenuis) Scientific name: Hymenocephalus tenuis Gilbert & Hubbs, 1917 The Slender grenadier fish (Hymenocephalus tenuis) is a marine fish of the family Macrouridae. Native range: Eastern Central Pacific, endemic to the Hawaiian Islands. Species factsScientific nameHymenocephalus tenuisFamilyMacrouridae (Grenadiers or rattails)OrderGadiformes (Cods)ClassActinopterygii (Ray-finned fishes)Depth range485–512 m (1591–1680 ft)EnvironmentMarine; benthopelagic; depth range 485 - 512 mClimateDeep-waterDistributionEastern Central Pacific: endemic to the Hawaiian Islands.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