HomeFish encyclopediaRay-finned fishesPerch-like fishThreadfinsLittlescale threadfin Littlescale threadfin (Polydactylus oligodon) Scientific name: Polydactylus oligodon G?nther, 1860 The Littlescale threadfin (Polydactylus oligodon) is a brackish-water fish of the family Polynemidae. Native range: Western Atlantic, southern Florida to Santos, Brazil. Not occurring in the Gulf of Mexico and western Caribbean Sea. BiologyDorsal spines (total): 9; Dorsal soft rays (total): 12; Anal spines: 3; Anal soft rays: 13Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePolydactylus oligodonFamilyPolynemidae (Threadfins)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length46.0Common length25.0EnvironmentMarine; brackish; demersalClimateTropicalDistributionWestern Atlantic: southern Florida to Santos, Brazil. Not occurring in the Gulf of Mexico and western Caribbean Sea.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: minor commercialResilienceHigh, 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