Greater amberjacks are the largest fish of the jacks. They usually have dark stripes extending from their 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. 15 pound fish would be considered average fish and most of these fish will be 40 pounds or less. Anglers target greater amberjack offshore on rocky reefs, wrecks, buoys, oil rigs and debris in deep water. You can catch them with smaller fish, squid and crabs.