Greater Amberjack

The Greater Amberjack (Seriola dumerili) is the largest species in the jack family Carangidae, found circumglobally in warm temperate and tropical seas, including the Atlantic, Indian, and Pacific Oceans. It is closely related to other Seriola species such as the almaco jack and yellowtail. Greater Amberjack are strongly associated with structure, frequently found around offshore reefs, rocky ledges, and shipwrecks at moderate depths. The species supports a significant recreational and commercial fishery across much of its range, and stock status varies by region, with some populations managed under specific catch regulations due to historical fishing pressure.

Greater Amberjack are large, elongated jacks reaching over a meter in length, identified by:

• A dark diagonal stripe running from the snout through the eye, most visible on fresh specimens
• Bronze to amber body coloration with a dark olive-brown back
• A robust, torpedo-shaped body that is more elongated than other pompano-type jacks
• Moderately forked tail fin without prominent yellow coloring
• Small, fine scales covering the body

The eye stripe and overall size distinguish it from the similar but smaller almaco jack, which has a more strongly notched dorsal fin and deeper body relative to length.

Greater Amberjack occur worldwide in warm temperate and tropical seas, including the western and eastern Atlantic, Mediterranean, Indian Ocean, and Pacific. They are typically found around offshore structure such as rocky reefs, ledges, artificial reefs, and shipwrecks at depths ranging from near the surface down to over 100 meters. Juveniles often associate with floating debris or sargassum mats in open water before moving to structure-oriented habitats as adults. The species prefers clear, warm marine waters and is not associated with estuaries or brackish environments, remaining a fully marine, structure-oriented fish throughout its adult life.

Greater Amberjack are active predators that patrol around reefs and wrecks, often in small to moderate-sized groups, feeding on smaller fish, squid, and crustaceans. They are known for powerful swimming ability and can range widely between structures in search of prey. Spawning occurs offshore in warmer months, with pelagic eggs and larvae drifting before juveniles settle near floating debris. As they mature, individuals shift toward a more structure-associated lifestyle around reefs and wrecks. As apex mid-level predators on many reef systems, Greater Amberjack help regulate populations of smaller reef and baitfish species.