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Yellow Jack

Caranx bartholomaei

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Original adult yellow jack illustration in side profile. Plain silvery-yellow body, yellow fins, long pectoral and deeply forked tail.
Original identification illustration of Yellow Jack. Features may vary.

Fun facts for your next surface interval

  • A young yellow jack may shelter beside floating Sargassum or jellyfish.
  • Older fish can develop much brighter yellow fins than their younger counterparts.
  • The yellow jack has been observed following larger animals to pick up feeding opportunities.

Florida and local context

Lake Worth Lagoon / Blue Heron Bridge area, Palm Beach County: Florida Museum explicitly marks this species verified in Lake Worth Lagoon. This documents occurrence, not current abundance or a guaranteed dive encounter.

Documented regional presence is not a guarantee of an encounter or a measure of how common this animal is at your dive site.

How to recognize this animal

A yellow jack combines a streamlined, moderately deep body with a silvery-yellow cast and yellow fins. The pectoral fin is long and curved, the tail deeply forked, and the mouth relatively small. Unlike a crevalle jack, it lacks the familiar strong black pectoral spot. Large individuals may look much more golden than small ones.

Size and life stages

Reported maximum length is about 39 inches, or 100 centimeters, although many fish are considerably smaller. Juveniles can have vertical bands that fade as they grow. Older individuals often have especially yellow fins. Color intensity therefore changes with age and should not be treated as a fixed paint chart or a reliable measure of sex.

Habitat and where to look

Adults use offshore reefs, reef edges and open water over the continental shelf. Juveniles occur in seagrass and may associate with floating Sargassum or jellyfish. These nursery associations are quite different from the image of a large jack cruising above a reef. Look through the water column as well as immediately alongside the bottom.

Range and local context

The species occurs from Massachusetts through Florida and the Caribbean to Brazil. Florida Museum marks yellow jack as verified in Lake Worth Lagoon under Carangoides bartholomaei. Current Eschmeyer and Smithsonian references use Caranx bartholomaei; both names refer to the same species. The local record documents occurrence without establishing a guaranteed encounter, a fishing location or present abundance.

What is on the menu?

Small fishes form an important part of the diet. Florida Museum records opportunistic following of larger feeding animals and scavenging of food they expose or leave behind. A jack accompanying another fish may therefore be taking advantage of its hunting activity. Do not assume that following a diver is equivalent behavior, and never provide food to test the idea.

Daily habits and behavior

Yellow jacks are often solitary but also form small groups. Their steady movement around reef margins can reveal the long pectoral fin and plain flank better than a head-on view. The absence of the bar jack's dark-and-blue back stripe is useful. A passing fish may leave quickly, so log the features you actually saw rather than filling gaps from expectation.

Mating and the next generation

Spawning is reported offshore from February through October, with aggregations and pelagic eggs. Florida Museum describes spawning just before sunrise in observed groups. This is a life-history account, not a verified Palm Beach calendar. Juveniles associated with floating habitat can be transported by currents, helping explain why early stages occur far from the reef habitats adults use.

Look-alikes and identification traps

Bar jacks have a distinctive dark stripe edged in blue that runs along the back and into the lower tail lobe. Crevalle jacks have a heavier head and conspicuous dark marks. Blue runners can also appear yellowish, so check the complete shape, fins and markings. The word 'yellow' alone is not enough to identify a fast-moving silver jack.

Observe without disturbing

Allow a cruising fish to pass instead of pursuing it off the reef or away from your buddy. A full side photograph showing the pectoral, head and tail is particularly valuable. Do not handle floating Sargassum or jellyfish to expose juveniles. Keep the species' documented ciguatera history separate from whether any particular fish can legally be taken.

Harvest, protection and eating safety

Harvest may be allowed; limits and site restrictions apply

Can it be hunted or harvested?

In Florida state waters this species is subject to the default recreational limit of two fish or 100 pounds per person per day, whichever is greater, unless a special area rule applies. No statewide species-specific minimum size is listed in the reviewed rules. Use lawful gear and hold the required saltwater fishing license unless exempt. “Unregulated” does not mean unrestricted or permission to harvest at a dive site. In Biscayne National Park, yellow jack counts toward the 10-fish per-person listed-species aggregate; transit above that aggregate is prohibited.

Florida seasons and areas

No species-specific annual Florida state-water closed months were identified in the reviewed rules. That is not an all-waters opening: park, sanctuary, refuge and other site closures can apply, and federal rules must be checked for the coast and trip. Verify the actual fishing location and current notices before taking fish.

Can it be speared?

Potentially yes where otherwise lawful: this species is not on FWC’s no-spearing list. Size, bag, area and gear rules still apply. Spearfishing is prohibited within 100 yards of a public swimming beach, a commercial or public fishing pier, or a bridge portion where public fishing is allowed, and in additional listed areas. No powerheads, bangsticks or rebreathers. This is not permission to spear at Blue Heron Bridge or another dive site.

Is it safe to eat?

Yellow jack has a documented ciguatera history and should not be described as reliably safe to eat. Florida Museum identifies it as a high-risk carrier. Cooking and freezing do not make a contaminated fish safe. Also consult current Florida DOH mercury and local-catch advisories, especially for children and people who are pregnant or may become pregnant.

Before you act: This recreational overview is not permission to collect or spear at your dive site. Confirm the species, date, management area, state or federal waters, gear, licenses and current local closures. Identification artwork cannot establish an identification or guarantee seafood safety.

Official rules and health guidance

Reviewed 2026-11-10. Rules and advisories can change; check the linked authorities before harvesting or eating.

Sources and review

Reviewed 2026-11-10.

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