HomeFish encyclopediaRay-finned fishesPerch-like fishThreefin blenniesEstuarine triplefin Estuarine triplefin (Forsterygion nigripenne) Scientific name: Forsterygion nigripenne Valenciennes, 1836 The Estuarine triplefin (Forsterygion nigripenne) is a brackish-water fish of the family Tripterygiidae. Native range: Southwest Pacific, throughout New Zealand. BiologyOccurs in estuaries and lower reaches of rivers and streams.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameForsterygion nigripenneFamilyTripterygiidae (Threefin blennies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length9.0EnvironmentBrackish; demersalClimateTemperateDistributionSouthwest Pacific: throughout New Zealand.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