HomeFish encyclopediaRay-finned fishesCodsGrenadiers or rattailsYiwarda whiptail Yiwarda whiptail (Trachonurus yiwardaus) Scientific name: Trachonurus yiwardaus Iwamoto & Williams, 1999 The Yiwarda whiptail (Trachonurus yiwardaus) is a marine fish of the family Macrouridae. Native range: Eastern Indian Ocean, Australia. BiologyDorsal spines: 2. Grooved lateral line present; body scales relatively small, lateral line scales over distance equal to predorsal length 39-50, scale rows between pelvic fin base and operculum 11-12, below midbase of first dorsal fin to anal fin 26-30, below origin of second dorsal fin 6-9; scale covering on gular and branchiostegal membranes extensive; teeth in both jaws relatively small, but with a distinctly enlarged outer series on premaxillary and a slightly enlarged inner series on dentary; total gill rakers on inner series of first arch 9-13, on inner and outer series of second arch 9-12. Snout protruding, angular.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameTrachonurus yiwardausFamilyMacrouridae (Grenadiers or rattails)OrderGadiformes (Cods)ClassActinopterygii (Ray-finned fishes)Maximum length50.0Depth range770–1293 m (2526–4242 ft)EnvironmentMarine; bathydemersal; depth range 770 - 1293 mClimateDeep-waterDistributionEastern Indian Ocean: Australia.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