HomeFish encyclopediaRay-finned fishesPerch-like fishThreefin blenniesBlacksaddle triplefin Blacksaddle triplefin (Enneapterygius vexillarius) Scientific name: Enneapterygius vexillarius Fowler, 1946 The Blacksaddle triplefin (Enneapterygius vexillarius) is a marine fish of the family Tripterygiidae. Native range: Northwest Pacific, Ryukyu Islands (Japan), Taiwan, and Hong Kong (China). Species factsScientific nameEnneapterygius vexillariusFamilyTripterygiidae (Threefin blennies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length3.3Depth range0–11 m (0–36 ft)EnvironmentMarine; demersal; depth range 0 - 11 mClimateTemperateDistributionNorthwest Pacific: Ryukyu Islands (Japan), Taiwan, and Hong Kong (China).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