HomeFish encyclopediaRay-finned fishesPerch-like fishThreefin blenniesWilliam's triplefin William's triplefin (Enneapterygius williamsi) Scientific name: Enneapterygius williamsi Fricke, 1997 The William's triplefin (Enneapterygius williamsi) is a marine fish of the family Tripterygiidae. Native range: Western Central Pacific, Vanuatu, New Caledonia, and Tonga. Species factsScientific nameEnneapterygius williamsiFamilyTripterygiidae (Threefin blennies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length2.7Depth range0–10 m (0–33 ft)EnvironmentMarine; demersal; depth range 0 - 10 mClimateSubtropicalDistributionWestern Central Pacific: Vanuatu, New Caledonia, and Tonga.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