Color is dark blue on the back, and brown-blue laterally, with a silvery white underbelly. Upper jaw elongate in the form of a spear. The first dorsal fin is greatly enlarged in the form of a sail with many black spots, squared off front, and is highest at its mid point. Pelvic fins are very narrow and reach almost to the anus. Lateral line is curved over the pectoral fin and then straightens to the base of the tail. Vertical rows of pale blue spots are spaced over the entire length of the fish.