HomeFish encyclopediaRay-finned fishesPerch-like fishDrums or croakersGulf weakfish Gulf weakfish (Cynoscion othonopterus) Scientific name: Cynoscion othonopterus Jordan & Gilbert, 1882 The Gulf weakfish (Cynoscion othonopterus) is a brackish-water fish of the family Sciaenidae. Native range: Eastern Central Pacific, Gulf of California. BiologyDorsal spines (total): 10 - 11; Dorsal soft rays (total): 23-27; Anal spines: 2; Anal soft rays: 10 - 11. Silvery, blue gray above, with dark dots on scales; tips of chin dusky; lining of opercle dusky; fins yellowish.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameCynoscion othonopterusFamilySciaenidae (Drums or croakers)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length70.0EnvironmentMarine; brackish; benthopelagicClimateSubtropicalDistributionEastern Central Pacific: Gulf of California.Conservation status (IUCN)Vulnerable (VU) (D2)Threat to humansHarmlessUsesFisheries: commercial; gamefish: yesResilienceMedium, 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