HomeFish encyclopediaRay-finned fishesPerch-like fishDamselfishesBrown demoiselle Brown demoiselle (Neopomacentrus filamentosus) Scientific name: Neopomacentrus filamentosus Macleay, 1882 The Brown demoiselle (Neopomacentrus filamentosus) is a marine fish of the family Pomacentridae. BiologyDorsal spines (total): 13; Dorsal soft rays (total): 10-11; Anal spines: 2; Anal soft rays: 11 - 12. Adults with long extended lobes on the dorsal and caudal fins. Plain grey with greenish shine over back. Twin yellow spots on operculum, just above pectoral fin base in juveniles.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameNeopomacentrus filamentosusFamilyPomacentridae (Damselfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length11.0Depth range5–12 m (16–39 ft)EnvironmentMarine; reef-associated; non-migratory; depth range 5 - 12 mClimateTropicalDistributionWestern Central Pacific: Thailand (Phuket), Malaysia, Singapore, Philippines, Indonesia, Western Australia, Papua New Guinea, New Britain, Solomon Islands, and New Caledonia. Larvae specimen were reported from Guam.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