Crevalle Jack Identification Guide
Spot the Crevalle Jack by its steep-browed head, black spot on the pectoral fin, and heavily scaled tail base.
Read the full Crevalle Jack encyclopedia entry →
Key identification features
- Deep, robust body with a blunt, steep head profile and a large mouth
- Golden-yellow to greenish-silver sides with a dark blotch on the upper edge of the gill cover
- Distinctive black spot at the base of the pectoral fin, a key diagnostic mark
- Strongly keeled, heavily scaled scutes running along the rear portion of the lateral line near the tail
- Deeply forked tail fin and a long, curved second dorsal fin
- Commonly 15-30 inches, with large individuals exceeding that range
Common look-alikes
- Bluefin Trevally: shows electric-blue fins and lacks the black pectoral fin spot
- Horse-eye Jack: has a larger eye and a more slender body, without the pectoral fin blotch
- Bar Jack: displays a dark stripe along the back near the tail rather than a spot on the pectoral fin
Where you'll see one
Crevalle Jack range widely through nearshore and offshore waters of the tropical and subtropical Atlantic, often schooling around inlets, jetties, and baitfish schools in turbid or clear water alike.
Frequently asked questions
What is the most reliable mark for identifying a Crevalle Jack?
Check the base of the pectoral fin for a distinct black spot; this feature, combined with the steep-browed head, reliably separates it from similar jack species.
How do I tell a Crevalle Jack from a Bluefin Trevally?
Look at the fin color and pectoral fin: the Bluefin Trevally has vivid blue fins and no pectoral spot, while the Crevalle Jack has golden-silver fins and a clear black pectoral fin blotch.