Definition of Yellow jack

Yellow Jack is a 1934 play and a 1938 Hollywood movie by the same name. Both were co-written by Sidney Howard and Paul de Kruif (the former a Pulitzer- and Oscar-winning playwright and screenwriter; the latter a well-known microbiologist and author).

The yellow jack, Carangoides bartholomaei (also known as coolihoo), is a species of offshore marine fish in the jack family, Carangidae. It is one of only two representatives of its genus present in the Atlantic Ocean, inhabiting waters off the east coast of the Americas from Massachusetts in the north to Brazil in the south, as well as a number of offshore islands. The yellow jack can be distinguished from closely related species the length of the jaw, as well as counts of the rays in the fins. It is a fairly large fish, growing to a recorded maximum length of 1 m, and a weight of at least 14 kg. Yellow jack inhabit reefs well offshore, moving either individually or in schools and are predatory fish which primarily take other small fish. Studies in the Caribbean suggest the species reaches sexual maturity between 23 and 32 cm, and spawns in offshore waters from February to October. Yellow jack are of minor economic importance, taken by both hook and net methods, and are considered to be fair table fish. They are often caught by boat anglers, although are overlooked for their larger relatives.