Balang fish and saury are not the same fish. Balang fish, scientific name is blue round trevally, also known as spiny fish, stick fish, pond fish, Huangzhan, pond fish, cooked fish, it is a species of the genus Round Trevally in the order Perciformes, family Trevallyidae; saury is a species of needlefish, The saury family, the only species of the saury genus, is one of the important food fish.

The body of Balang fish is spindle-shaped and slightly flattened laterally. The fat eyelids are well developed and reach the middle of the eye both front and back. Only a long slit is exposed in the center of the pupil. The back end of the maxilla is blunt and rounded. The body is covered with small round scales and has a lateral line. All or most of the straight part of the lateral line has ribbed scales. The ratio of pectoral fin length to head length varies with the size of the fish. There is a white spot on the top of the front of the dorsal fin.

The body of saury is elongated and slender, with flat sides, a long head, a flat back, and a faint ridge in the center. The mouth is in the anterior position, with the front part straight and the back part slightly cleft. The two jaws extend forward in the shape of short beaks, and the lower jaw is more protruding than the upper jaw. The teeth are small, with one row on each jaw, more concentrated in the front and less or absent in the back. The gill rakers are slender and there are no false gills.