Body elongate, rounded in cross-section. Upper and lower jaws greatly elongate and studded with sharp teeth; a conspicuous appendage sometimes present at tip of lower jaw; gill rakers absent. Anterior part of dorsal fin with a low lobe; dorsal-fin rays numerous, 24 to 27; anal-fin lobe low; anal-fin rays numerous, 22 to 24; pectoral and pelvic fins relatively short; pectoral-fin rays 13 or 14; a distinct black lateral keel on caudal peduncle; caudal fin deeply forked, lower lobe much longer than upper. Predorsal scales very numerous and tiny, 280 to 340. Body dark bluish above, silvery white below; juveniles with elevated black lobe in posterior part of dorsal fin which is lost with growth.
habitats
Found in offshore and coastal waters. Feeds mainly on small fishes.
Distribution
Indo-Pacific: East Africa to the central and south Pacific. Eastern Central Pacific: oceanic islands such as the Revillagigedo, Clipperton and Cocos. It is common in waters around Taiwan.
Utility
Marketed mostly fresh. The flesh is of good quality.
沈世傑 編 Shih-Chieh Shen ed. 1993 
