HomeFish encyclopediaRay-finned fishesPerch-like fishRoundheadsMoustache longfin Moustache longfin (Plesiops mystaxus) Scientific name: Plesiops mystaxus Mooi, 1995 The Moustache longfin (Plesiops mystaxus) is a marine fish of the family Plesiopidae. Native range: Western Indian Ocean, Red Sea, Comoros, Madagascar, and southern Oman. BiologyDorsal spines (total): 12; Dorsal soft rays (total): 7; Anal spines: 3; Anal soft rays: 8. Caudal fin rounded.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePlesiops mystaxusFamilyPlesiopidae (Roundheads)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length9.0Depth range0–8 m (0–26 ft)EnvironmentMarine; demersal; depth range 0 - 8 mClimateTropicalDistributionWestern Indian Ocean: Red Sea, Comoros, Madagascar, and southern Oman.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