HomeFish encyclopediaRay-finned fishesPerch-like fishThreefin blenniesFlagtail triplefin Flagtail triplefin (Enneapterygius signicauda) Scientific name: Enneapterygius signicauda Fricke, 1997 The Flagtail triplefin (Enneapterygius signicauda) is a marine fish of the family Tripterygiidae. Native range: Pacific Ocean, Vanuatu, Tonga, and American Samoa. Species factsScientific nameEnneapterygius signicaudaFamilyTripterygiidae (Threefin blennies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length2.5Depth range0–11 m (0–36 ft)EnvironmentMarine; demersal; depth range 0 - 11 mClimateTropicalDistributionPacific Ocean: Vanuatu, Tonga, and American Samoa.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