Yellow Jack

The Yellow Jack is a medium-sized member of the jack family (Carangidae) found throughout the tropical and subtropical western Atlantic, including Florida, the Gulf of Mexico, the Caribbean, and south to Brazil. It is named for the pronounced yellow tint that develops on its fins and tail, especially in larger individuals, distinguishing it from the more silvery Blue Runner and Bar Jack. It commonly associates with coral reefs and open water near structure, sometimes schooling with other jack species. It is a regularly encountered species popular among divers and anglers, with a stable population and no major conservation concerns across its range.

• Moderately deep, laterally compressed, elongate-oval body
• Silvery-blue back and sides with a pronounced yellow wash on fins and tail
• Faint dark blotches sometimes visible along the lateral line in larger fish
• Deeply forked, bright yellow-tinted tail
• Small, sharp scutes on the rear lateral line
• Sloping, moderately pointed snout

Typically 40-60 cm, up to 1 m. The strong yellow coloration on the tail and fins, especially compared to the plainer Blue Runner, is the most reliable field mark for this species.

Yellow Jacks inhabit tropical and subtropical waters of the western Atlantic, ranging from Florida and Bermuda through the Gulf of Mexico and Caribbean to Brazil. They are commonly found around coral reefs, reef drop-offs, and open water adjacent to structure, typically at depths from the surface to about 40 m. They tend to favor clearer offshore reef environments more than heavily silted coastal waters, often patrolling reef edges in search of prey. Juveniles may occur in slightly shallower reef and inshore habitats before adults move to deeper reef and open-water environments as they grow.

Yellow Jacks are moderately social, often forming small to medium schools near reef edges and sometimes mixing with other jack species such as Horse-eye Jacks or Bar Jacks. They are active carnivorous predators, feeding on small fish and invertebrates, frequently hunting along reef margins and in open water adjacent to structure. Spawning occurs offshore during warmer months, producing pelagic eggs and larvae typical of carangids. As an abundant reef-associated predator, the Yellow Jack contributes to the regulation of smaller reef fish and invertebrate populations, while also serving as prey for larger pelagic predators, forming part of the broader reef food web.