The pike is slender, with a body length of 17 ~ 24 cm. The upper jaw is triangular, equal in length and width, and the lower jaw extends into a beak shape. The teeth are very small, the body surface is covered with small round scales, and there is a wide emerald vertical belt on the middle line of the back. The dorsal fin is opposite to the gluteal fin, and both are located at the back of the body. The pectoral fin is yellow, the caudal fin is light green, and the lower leaf is slightly longer than the upper leaf. There are many common folk names of Mata fish, which are also called "rod fish" because of its slightly cylindrical shape, and "needle fish" because of its pointed mouth and needle shape. Most of them are distributed in the western North Pacific.