HomeFish encyclopediaRay-finned fishesPerch-like fishDamselfishesThreeline damsel Threeline damsel (Pomacentrus trilineatus) Scientific name: Pomacentrus trilineatus Cuvier, 1830 The Threeline damsel (Pomacentrus trilineatus) is a marine fish of the family Pomacentridae. Native range: Western Indian Ocean, Red Sea and the east African coast south to Mozambique, and Madagascar. BiologyDorsal spines (total): 13; Dorsal soft rays (total): 14-15; Anal spines: 2; Anal soft rays: 14 - 16. Exhibits geographic color variations.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePomacentrus trilineatusFamilyPomacentridae (Damselfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length10.0Depth range0–4 m (0–13 ft)EnvironmentMarine; reef-associated; non-migratory; depth range 0 - 4 mClimateTropicalDistributionWestern Indian Ocean: Red Sea and the east African coast south to Mozambique, and Madagascar.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