The wahoo is a slender, oceanic fish with a body covered with scales. Jaws are elongated to form an almost beak-like snout; the teeth are triangular and finely serrated. Two dorsal fins are present; the first is several times the length of the second. These fins are followed by 8 or 9 finlets. The anal fin is approximately below the second dorsal fin and is also succeeded by 9 finlets. The pelvic fins are situated below the pectoral fins. The caudal peduncle is narrow and contains three sets of keels. Small scales cover the body and no anterior corselet is present. Lateral line runs the length of the body, abruptly curving under the first dorsal fin. A swim bladder is present. The body is dark blue or green above, with 24 or more wavy cobalt blue bars running vertically along the sides. The belly and lower sides are silvery.