Greater amberjacks, Seriola dumerili, are the largest of the jacks. They usually have dark stripes extending from nose to in front of their dorsal fins. They have no scutes and soft dorsal bases less than twice the length of the anal fin bases. They are usually 18 kg (40 pounds) or less, and are found associated with rocky reefs, debris, and wrecks, typically in 20 to 75 m (10 to 40 fathoms).
Lesser amberjacks, Seriola fasciata, have a proportionately larger eye and deeper body than the greater amberjack. They are olive green or brownish-black with silver sides and usually have a dark band extending upward from their eyes. Juveniles have split or wavy bars on their sides. The adults are usually under 5 kg (10 lbs). They are found deeper than other jacks, commonly 50 to 130 m (30 to 70 fathoms).
Juveniles can be caught in about of water, near floating objects.
Banded Rudderfish, Seriola zonata, is the second smallest Amberjack. This Jack can be distinguished from the Pilotfish by the presence of a first dorsal fin. Juveniles are banded vertically like Pilotfish, and follow large objects or animals. Large individuals (over 10 inches) have no bands. This fish, though commonly caught, is rarely identified. Large ones, with a raccoon-sripe on the eye and an iridescent gold stripe on the side, are usually called Amberjacks when caught, and juveniles are called Pilotfish. They are found as far north as Nova Scotia. They are less dependent on sharks, etc., than Pilotfish. They can be caught on Shrimp, Silversides, lures (eg Spoons) and flies.