HomeFish encyclopediaRay-finned fishesPerch-like fishThreefin blenniesBullhead triplefin Bullhead triplefin (Trianectes bucephalus) Scientific name: Trianectes bucephalus McCulloch & Waite, 1918 The Bullhead triplefin (Trianectes bucephalus) is a marine fish of the family Tripterygiidae. Native range: Eastern Indian Ocean, southern Australia, from Western Australia to Victoria and Tasmania. Species factsScientific nameTrianectes bucephalusFamilyTripterygiidae (Threefin blennies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length7.0Depth range0–5 m (0–16 ft)EnvironmentMarine; demersal; depth range 0 - 5 mClimateSubtropicalDistributionEastern Indian Ocean: southern Australia, from Western Australia to Victoria and Tasmania.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interestResilienceHigh, 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