HomeFish encyclopediaRay-finned fishesPerch-like fishSquaretailsPacific squaretail Pacific squaretail (Tetragonurus pacificus) Scientific name: Tetragonurus pacificus Abe, 1953 The Pacific squaretail (Tetragonurus pacificus) is a marine fish of the family Tetragonuridae. Native range: Indian and Pacific, in tropical waters; possibly strays to southern Africa. BiologyDorsal spines (total): 10 - 11; Dorsal soft rays (total): 10-12; Anal spines: 1; Anal soft rays: 10 - 12; Vertebrae: 39 - 43. Light grey to brown in color.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameTetragonurus pacificusFamilyTetragonuridae (Squaretails)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)EnvironmentMarine; pelagic-oceanicClimateTropicalDistributionIndian and Pacific: in tropical waters; possibly strays to southern Africa.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceVery Low, minimum population doubling time more than 14 years (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