The King Mackerel's back is iridescent blue-green, and it's sides
are silvery; it has a very streamlines body and tapered head. No black
pigment is found on the front of the dorsal fin. The lateral line
is easy to see; it starts high behind the gill plate and drops sharply
toward the belly near the second dorsal fin. The King Mackerel is
sometimes confused with the larger-on-average-sized Wahoo, but Wahoo
have numerous deep blue-black vertical bars running along the flanks.
The Wahoo's head is also longer and more tapered to a point, with
a second dorsal fin usually lower in silhouette than the first dorsal;
whereas the King Mackerel's first dorsal often is lower in height
than the second dorsal. It is also known as the Kingfish.
Size: Common 10 to 20 pounds, 30 to 40 pounders not unusual; 50-pound
fish caught regularly. Florida and world record is 90 pounds.