HomeFish encyclopediaRay-finned fishesPerch-like fishDamselfishesGuam damsel Guam damsel (Pomachromis guamensis) Scientific name: Pomachromis guamensis Allen & Larson, 1975 The Guam damsel (Pomachromis guamensis) is a marine fish of the family Pomacentridae. Native range: Western Central Pacific, endemic to the Mariana Islands. BiologyDorsal spines (total): 14; Dorsal soft rays (total): 12-13; Anal spines: 2; Anal soft rays: 13Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePomachromis guamensisFamilyPomacentridae (Damselfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length4.5Depth range3–33 m (10–108 ft)EnvironmentMarine; reef-associated; non-migratory; depth range 3 - 33 mClimateTropicalDistributionWestern Central Pacific: endemic to the Mariana Islands.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