yellow jack

The term "yellow jack" can refer to two distinct subjects: yellow fever, a serious infectious disease, and a specific type of fish.

The fish, scientifically known as Carangoides bartholomaei, is a yellowish carangid marine food fish found in the Atlantic Ocean, from Massachusetts to Brazil. It is also recognized as the yellow jack, a species within the jack family (Carangidae). These fish are characterized by their laterally compressed bodies, a row of enlarged scales near the tailfin, and a deeply forked tail. They often display a golden-yellow sheen on their sides and fins, making them visually distinctive. Jacks are commercially important and are also favored by sports fishers.12