HomeFish encyclopediaRay-finned fishesPerch-like fishThreefin blenniesHawaiian blackhead triplefin Hawaiian blackhead triplefin (Enneapterygius atriceps) Scientific name: Enneapterygius atriceps Jenkins, 1903 The Hawaiian blackhead triplefin (Enneapterygius atriceps) is a marine fish of the family Tripterygiidae. Native range: Pacific Ocean, Hawaiian Islands, French Frigate Shoals, Laysan Island, and Midway Atoll. Species factsScientific nameEnneapterygius atricepsFamilyTripterygiidae (Threefin blennies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length2.6Depth range1–23 m (3–75 ft)EnvironmentMarine; reef-associated; depth range 1 - 23 mClimateTropicalDistributionPacific Ocean: Hawaiian Islands, French Frigate Shoals, Laysan Island, and Midway Atoll.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