HomeFish encyclopediaRay-finned fishesPerch-like fishDrums or croakersWeakfish Weakfish (Cynoscion squamipinnis) Scientific name: Cynoscion squamipinnis G?nther, 1867 The Weakfish (Cynoscion squamipinnis) is a brackish-water fish of the family Sciaenidae. Native range: Eastern Pacific, Gulf of California to Peru. BiologyInhabits coastal waters, along shores and in estuaries. Feeds on fishes, shrimps and other crustaceans.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameCynoscion squamipinnisFamilySciaenidae (Drums or croakers)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length64.0Common length40.0EnvironmentMarine; brackish; benthopelagicClimateTropicalDistributionEastern Pacific: Gulf of California to Peru.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessUsesFisheries:ResilienceMedium, minimum population doubling time 1.4 - 4.4 years (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