HomeFish encyclopediaRay-finned fishesPerch-like fishThreefin blenniesTriangle triplefin Triangle triplefin (Helcogramma inclinata) Scientific name: Helcogramma inclinata Fowler, 1946 The Triangle triplefin (Helcogramma inclinata) is a marine fish of the family Tripterygiidae. Native range: Western Pacific, Ryukyu Islands, Taiwan, and the Philippines. BiologyFound in rocky shore areas and rocky surge channels with sparse coral growth at depths of less than a meter to 6 m.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameHelcogramma inclinataFamilyTripterygiidae (Threefin blennies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length4.6Depth range0–9 m (0–30 ft)EnvironmentMarine; demersal; depth range 0 - 9 mClimateSubtropicalDistributionWestern Pacific: Ryukyu Islands, Taiwan, and the Philippines.Conservation status (IUCN)Least Concern (LC)Threat 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