HomeFish encyclopediaRay-finned fishesPerch-like fishThreefin blenniesNorthern yellow-black triplefin Northern yellow-black triplefin (Enneapterygius gracilis) Scientific name: Enneapterygius gracilis Fricke, 1994 The Northern yellow-black triplefin (Enneapterygius gracilis) is a marine fish of the family Tripterygiidae. Native range: Indo-West Pacific, Endemic to northern Australia. BiologyOccurs in shallow tidal pools, and seems to be associated with coralline rock and seagrass.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameEnneapterygius gracilisFamilyTripterygiidae (Threefin blennies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length2.8Depth range0–15 m (0–49 ft)EnvironmentMarine; demersal; non-migratory; depth range 0 - 15 mClimateTropicalDistributionIndo-West Pacific: Endemic to northern Australia.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