HomeFish encyclopediaRay-finned fishesCodsGrenadiers or rattailsSlender unicorn rattail Slender unicorn rattail (Trachyrincus longirostris) Scientific name: Trachyrincus longirostris G?nther, 1878 The Slender unicorn rattail (Trachyrincus longirostris) is a marine fish of the family Macrouridae. Native range: Southwest Pacific, eastern Australia (New South Wales to Victoria) and New Zealand. BiologyA benthic species found on the continental slope.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameTrachyrincus longirostrisFamilyMacrouridae (Grenadiers or rattails)OrderGadiformes (Cods)ClassActinopterygii (Ray-finned fishes)Maximum length60.0EnvironmentMarine; bathydemersalClimateDeep-waterDistributionSouthwest Pacific: eastern Australia (New South Wales to Victoria) and New Zealand.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceLow, minimum population doubling time 4.5 - 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