HomeFish encyclopediaRay-finned fishesPerch-like fishThreefin blenniesCommon triplefin Common triplefin (Forsterygion lapillum) Scientific name: Forsterygion lapillum Hardy, 1989 The Common triplefin (Forsterygion lapillum) is a marine fish of the family Tripterygiidae. Native range: Southwest Pacific, throughout New Zealand. Records from Chatham Islands are unconfirmed. BiologyDorsal spines (total): 25 - 26; Dorsal soft rays (total): 13-14; Anal spines: 0; Anal soft rays: 25Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameForsterygion lapillumFamilyTripterygiidae (Threefin blennies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length6.7Depth range0–20 m (0–66 ft)EnvironmentMarine; benthopelagic; depth range 0 - 20 mClimateTemperateDistributionSouthwest Pacific: throughout New Zealand. Records from Chatham Islands are unconfirmed.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interestResilienceHigh, minimum population doubling time less than 15 months (K=1.20; tmax=3) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026