HomeFish encyclopediaRay-finned fishesSilversidesNeotropical silversidesLongfin silverside Longfin silverside (Atherinella eriarcha) Scientific name: Atherinella eriarcha Jordan & Gilbert, 1882 The Longfin silverside (Atherinella eriarcha) is a marine fish of the family Atherinopsidae. Native range: Eastern Central Pacific, Baja California, Mexico and the Revillagigedo Island to Puerto Utria, Colombia, including the Gulf of California. BiologyDorsal spines (total): 4 - 6; Dorsal soft rays (total): 9-13; Anal spines: 0 - 1; Anal soft rays: 23 - 31; Vertebrae: 37 - 41. Branchiostegal rays: 6.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAtherinella eriarchaFamilyAtherinopsidae (Neotropical silversides)OrderAtheriniformes (Silversides)ClassActinopterygii (Ray-finned fishes)Maximum length8.0EnvironmentMarine; reef-associatedClimateTropicalDistributionEastern Central Pacific: Baja California, Mexico and the Revillagigedo Island to Puerto Utria, Colombia, including the Gulf of California.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