HomeFish encyclopediaRay-finned fishesSilversidesNeotropical silversidesTopsmelt silverside Topsmelt silverside (Atherinops affinis) Scientific name: Atherinops affinis Ayres, 1860 The Topsmelt silverside (Atherinops affinis) is a brackish-water fish of the family Atherinopsidae. Native range: Eastern Pacific, Vancouver Island in British Columbia, Canada to Baja California, Mexico and the Gulf of California. BiologyDorsal spines (total): 6 - 10; Dorsal soft rays (total): 8-14; Anal spines: 1; Anal soft rays: 19 - 25; Vertebrae: 44 - 52. Blue gray to green above, silvery below; a striking silver band bordered above with blue extends the full length of the body. Branchiostegal rays: 5-6.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAtherinops affinisFamilyAtherinopsidae (Neotropical silversides)OrderAtheriniformes (Silversides)ClassActinopterygii (Ray-finned fishes)Maximum length37.0Common length28.0EnvironmentMarine; brackish; pelagic-neriticClimateSubtropicalDistributionEastern Pacific: Vancouver Island in British Columbia, Canada to Baja California, Mexico and the Gulf of California.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessUsesFisheries: commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (tm=2; tmax=7; Fec = 1,000) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026