Bright greenish blue above, yellow on sides, with capability of flashing purple, chartreuse, and a wide range of other colors; body tapers sharply from head to tail; irregular blue or golden blotches scattered over sides; anterior profile of head on adult males is nearly vertical; head of females more sloping; the single dark dorsal fin extends from behind the head to the tail; anal fin margin concave and extending from anus to tail.

OFFSHORE in warm waters.

Common to 30 pounds.

One of the fastest-growing fish, thought to live no more than 5 years; swimming speed estimated at 50 knots; spawns in warm oceanic currents throughout much of the year; young found in sargassum weed; feeds on flying fish and squid.