HomeFish encyclopediaRay-finned fishesSilversidesNeotropical silversidesJack silverside Jack silverside (Atherinopsis californiensis) Scientific name: Atherinopsis californiensis Girard, 1854 The Jack silverside (Atherinopsis californiensis) is a marine fish of the family Atherinopsidae. Native range: Eastern Pacific, Yaquina Bay in Oregon, USA to southwestern coast of Baja California, Mexico. BiologyDorsal spines (total): 6 - 10; Dorsal soft rays (total): 11-14; Anal spines: 1; Anal soft rays: 21 - 26; Vertebrae: 50 - 54. Branchiostegal rays: 5-6.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAtherinopsis californiensisFamilyAtherinopsidae (Neotropical silversides)OrderAtheriniformes (Silversides)ClassActinopterygii (Ray-finned fishes)Maximum length45.0Common length40.0EnvironmentMarine; pelagic-neriticClimateSubtropicalDistributionEastern Pacific: Yaquina Bay in Oregon, USA to southwestern coast of Baja California, Mexico.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessUsesFisheries: commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (tm=2.5; Fec = 6,000) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026