The body is long and flat on the sides and is slightly arched. The head is well-developed while the eyes are relatively small. The jaw is slightly prominent and the mouth contains numerous teeth arranged in rows. Teeth are also present on the tongue. The dorsal fin is small with rays united by a membrane and a short spine that is set forwards. The second dorsal fin and the anal fin both have a high point, though the anal fin is shorter than the second dorsal. The colouring on the dorsal side is a greyish light blue with pinkish highlights. The sides have a golden iridescence and the abdomen is silvery. Juveniles are yellow with vertical streaks and have gold coloured eyes.
Juveniles tend to form large groups under the shade of floating objects while adults form smaller groups. The species is pelagic and feeds on fish and invertebrates. Amberjacks are often seen close to the coast in the spring and summer.