This is a Cobia about 4 1/2 feet. Photo by Rod 22 Mar 04 in about 10
feet water.
Location was Christmas Tree-French Reef;
Key Largo.
Rachycentron canadum
I reduced picture size so they would be visible on your screen. Just click on thumbnail for 6 x 4 picture, and name for 10 x 8 full size picture or more info. These pictures of the Cobia on Christmas Tree were first thought to be a shark. Closer exam showed it to be a Cobia, with the paired anal and dorsal fins, like an Amberjack.
Size: 2- 4 ft; max 6 feet;
Audubon Field Guide; page 474; plate 272;
Reef Fish ID 3rd ed.; page 84-85; plate 85;