Bluefin Trevally Identification Guide
Recognize the Bluefin Trevally by its electric-blue fins and dark-spotted, blue-green body.
Read the full Bluefin Trevally encyclopedia entry →
Key identification features
- Deep, oval-shaped, laterally compressed body, blue-green to bluish-gray overall with scattered small black spots
- Vivid electric-blue dorsal, anal, and caudal fins, especially bright in adults
- Steep, rounded head profile with a moderately large eye
- Strongly arched lateral line with pronounced scutes toward the tail
- Deeply forked tail fin and a long, curved second dorsal fin
- Typically 12-24 inches, occasionally larger
Common look-alikes
- Crevalle Jack: golden-silver body with a black pectoral fin spot instead of blue fins, and a steeper, blunter head profile
- Giant Trevally: grows much larger, with a steeper head and less vivid, more silvery-gray fin coloration overall
- Bar Jack: shows a dark stripe along the back near the tail and lacks the widespread blue fin coloration of the Bluefin Trevally
Where you'll see one
Bluefin Trevally patrol coral reefs, lagoons, and nearshore drop-offs throughout the Indo-Pacific, often hunting alone or in small groups over reef flats and channels, and are frequently observed shadowing larger predators or foraging rays to snap up disturbed prey.
Frequently asked questions
What is the easiest way to identify a Bluefin Trevally underwater?
Look for bright electric-blue coloring across the dorsal, anal, and tail fins combined with small dark spots scattered over a blue-green body.
How do I tell a Bluefin Trevally from a Giant Trevally?
Compare size and fin color: the Giant Trevally grows much larger with duller, silvery-gray fins, while the Bluefin Trevally stays smaller and shows unmistakably vivid blue fins.
Bluefin Trevally identified by the community
Recent Bluefin Trevally catches identified with Fish Identifier.
