HomeFish encyclopediaRay-finned fishesCodsGrenadiers or rattailsHawaiian softhead grenadier Hawaiian softhead grenadier (Malacocephalus hawaiiensis) Scientific name: Malacocephalus hawaiiensis Gilbert, 1905 The Hawaiian softhead grenadier (Malacocephalus hawaiiensis) is a marine fish of the family Macrouridae. Native range: Eastern Central Pacific, Hawaiian Islands. This species is very similar to Malacocephalus laevis (Lowe, 1843) and possibly a synonym. Species factsScientific nameMalacocephalus hawaiiensisFamilyMacrouridae (Grenadiers or rattails)OrderGadiformes (Cods)ClassActinopterygii (Ray-finned fishes)Depth range300–1250 m (984–4101 ft)EnvironmentMarine; benthopelagic; depth range 300 - 1250 mClimateDeep-waterDistributionEastern Central Pacific: Hawaiian Islands. This species is very similar to Malacocephalus laevis (Lowe, 1843) and possibly a synonym.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 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