Distribution and Habitat
The threadfin jack is distributed throughout the tropical regions of the eastern Pacific Ocean, inhabiting the western coast of America. The northern limit to the species range is southern Baja California, with its range extending south to Mexico and Central America to a southern limit of Ecuador, with the species also recorded from the Galapagos Islands. It is one of only two species of the genus Carangoides found on the western coastline of the Americas, with the other species being the widely distributed island trevally, Carangoides orthogrammus.
The species appears to undergo a major transition in lifestyle after its juvenile phase, with young individuals leading a pelagic lifestyle, able to be transported to offshore islands such as the Galapagos by currents. Older individuals are more benthic in nature, inhabiting the bottom of the water column in mostly coastal waters on reefs. Smaller fish have been recorded from estuaries, mangrove lined creeks, shallow bays and lagoons, although larger fish live in much deeper waters up to 50 m (160 ft) in depth.
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