Threadfin

Threadfins are silvery grey ray-finned fish of the familyPolynemidae. Found in tropical to subtropical waters throughout the world, the threadfin family contains nine genera and about 40 species. A distantly related species sometimes known by the name threadfin, Scyris indica, is properly the Indian threadfish (family Carangidae).

Ranging in length from 11 cm (4.5 in) in the dwarf threadfin (Parapolynemus verekeri) to 2 m (6.6 ft) in fourfinger threadfin (Eleutheronema tetradactylum) and giant African threadfin (Polydactylus quadrifilis), threadfins are both important to commercial fisheries as a food fish, and popular among anglers. Their habit of forming large schools makes the threadfins a reliable and economic catch.