This is a Black Jack. Black Jacks are fish that live in the open ocean and that are seen over the reef only occasionally. Black Jacks can be identified by their size, the color of their tail fins, and the size of their dorsal and anal fins. Black Jacks can be up to 3 feet long. This is slightly bigger than many other types of jacks.
All jacks have a similar shape.
The dorsal fin is the fin on top, and the anal fin is the fin on the bottom near the tail. The tail fin is also called the caudal fin. Notice this Black Jack has long, yellow pectoral fins, the fins near its gills on either side of its body. Although often a silvery gray color, Black Jacks can change their color to a dark brown or black. Black Jacks are built for speed.