HomeFish encyclopediaRay-finned fishesPerch-like fishThreefin blenniesLargemouth triplefin Largemouth triplefin (Ucla xenogrammus) Scientific name: Ucla xenogrammus Holleman, 1993 The Largemouth triplefin (Ucla xenogrammus) is a marine fish of the family Tripterygiidae. BiologyDorsal spines (total): 15; Anal spines: 1; Anal soft rays: 18 - 21Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameUcla xenogrammusFamilyTripterygiidae (Threefin blennies)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length4.7Depth range2–41 m (7–135 ft)EnvironmentMarine; reef-associated; depth range 2 - 41 m, usually 2 - 32 mClimateTropicalDistributionPacific Ocean: Viet Nam, Philippines, Palau and Caroline Islands to Papua New Guinea, Australia (including Christmas Island), and Solomon Islands, Fiji, Tonga, east to American Samoa and Rapa.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interestResilienceHigh, 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