HomeFish encyclopediaRay-finned fishesPerch-like fishThreefin blenniesBlacktail threefin Blacktail threefin (Enneapterygius bahasa) Scientific name: Enneapterygius bahasa Fricke, 1997 The Blacktail threefin (Enneapterygius bahasa) is a marine fish of the family Tripterygiidae. Native range: Western Pacific, Japan, Taiwan, Philippines, Indonesia, Papua New Guinea, Australia, Palau, and Guam. BiologyOccurs in shallow waters, mainly on the reef flat or crest. Found on shady vertical rock walls with some current and relatively high oxygen level.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameEnneapterygius bahasaFamilyTripterygiidae (Threefin blennies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length3.2Depth range0–18 m (0–59 ft)EnvironmentMarine; reef-associated; depth range 0 - 18 mClimateTropicalDistributionWestern Pacific: Japan, Taiwan, Philippines, Indonesia, Papua New Guinea, Australia, Palau, and Guam.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceHigh, 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