The koheru (Decapterus koheru) is a ray-finned fish of the genus Decapterus, part of the family Carangidae. It is endemic to New Zealand where it occurs from Manawatāwhi / Three Kings Islands to southern North Island. This is a schooling, pelagic species of coastal waters where it is found within shallow bays, harbours, estuaries and near rocky reefs and offshore islands at depths of between NaNm (-2,147,483,648feet). Juveniles prefer rocky inshore areas, while adults are known to form dense schools in offshore waters. The maximum fork length is 40.3cm (15.9inches). They live to around 10 years and juveniles growth quickly, attaining a fork length of 37cm (15inches) by the time they are three years old. They feed on zooplankton. It is a species of minor interest to commercial fisheries but is taken by recreational anglers.