HomeFish encyclopediaRay-finned fishesPuffers and FilefishesFilefishesDegen's leatherjacket Degen's leatherjacket (Thamnaconus degeni) Scientific name: Thamnaconus degeni Regan, 1903 The Degen's leatherjacket (Thamnaconus degeni) is a marine fish of the family Monacanthidae. Native range: Eastern Indian Ocean, southern Australia, from South Australia to New South Wales and Tasmania. Species factsScientific nameThamnaconus degeniFamilyMonacanthidae (Filefishes)OrderTetraodontiformes (Puffers and Filefishes)ClassActinopterygii (Ray-finned fishes)Maximum length28.0Depth range70 m (230 ft)EnvironmentMarine; demersal; depth range ? - 70 mClimateTemperateDistributionEastern Indian Ocean: southern Australia, from South Australia to New South Wales and Tasmania.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