HomeFish encyclopediaRay-finned fishesPerch-like fishThreefin blenniesHelmet triplefin Helmet triplefin (Helcogramma kranos) Scientific name: Helcogramma kranos Fricke, 1997 The Helmet triplefin (Helcogramma kranos) is a marine fish of the family Tripterygiidae. Native range: Western Central Pacific, Indonesia. Species factsScientific nameHelcogramma kranosFamilyTripterygiidae (Threefin blennies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length3.1Depth range0–2 m (0–7 ft)EnvironmentMarine; demersal; depth range 0 - 2 mClimateTropicalDistributionWestern Central Pacific: Indonesia.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