HomeFish encyclopediaRay-finned fishesPerch-like fishJacks and pompanosBlackfin jack Blackfin jack (Hemicaranx zelotes) Scientific name: Hemicaranx zelotes Gilbert, 1898 The Blackfin jack (Hemicaranx zelotes) is a brackish-water fish of the family Carangidae. Native range: Eastern Central Pacific, Baja California, Mexico to Peru. BiologyBody sub-oval and compressed; both jaws with a single row of small, comb-like teeth; pectoral fins falcate and relatively sort (from 3.5 to 4.5 times in total length); back silvery blue; belly and flanks white or silvery; pectoral fins darker.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameHemicaranx zelotesFamilyCarangidae (Jacks and pompanos)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length35.0Common length20.0EnvironmentMarine; brackish; benthopelagicClimateTropicalDistributionEastern Central Pacific: Baja California, Mexico to Peru.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessUsesFisheries: minor commercial; gamefish: yesResilienceHigh, 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