HomeFish encyclopediaRay-finned fishesSilversidesNeotropical silversidesThickscale silverside Thickscale silverside (Atherinella pachylepis) Scientific name: Atherinella pachylepis G?nther, 1864 The Thickscale silverside (Atherinella pachylepis) is a marine fish of the family Atherinopsidae. Native range: Eastern Pacific, Cutuco, El Salvador to Peru. Not recorded from Costa Rica. BiologyForms aggregations in shallow bays and coastal reefs.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAtherinella pachylepisFamilyAtherinopsidae (Neotropical silversides)OrderAtheriniformes (Silversides)ClassActinopterygii (Ray-finned fishes)Maximum length16.0EnvironmentMarine; reef-associatedClimateTropicalDistributionEastern Pacific: Cutuco, El Salvador to Peru. Not recorded from Costa Rica.Conservation status (IUCN)Least Concern (LC)Threat 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