The standard length is 5.5- 10.0 times of body height, 3.3-5.5 times of head length, 4.4-5. 1 times of tail handle length and 9.0- 13.5 times of tail handle height. The head length is 2. 1-4.6 times of the kiss length, 4.0-7.8 times of the eye diameter and 3.2-4. 1 times of the eye distance. The length of the tailstock is 2.0-2.6 times the height of the tailstock. The body is long, the head is flat, and the body is gradually flat after the dorsal fin. Kiss the flat circle. A cheap mouth and a wide mouth. The upper jaw is slightly longer than the lower jaw, and the upper jaw, lower jaw and palatal bone all have villous fine teeth. The lip is thick, the upper lip and the lower lip are combined at the corner of the mouth, and the posterior groove of the lip is discontinuous. It must be 4 pairs, both longer. The end of the maxillary whisker exceeds the pectoral fin. The side chin must reach the bottom of the pectoral fin. The eyes are the same size, located at the back of the head, and the width between the eyes is the same. The nostrils are separated, and the rear nostril is farther from the front edge than the front nostril. The branchial foramen is large, and the left and right branchial membranes are combined but not connected with the isthmus. The dorsal fin spine is weak, and the trailing edge is smooth and serrated. The pectoral fin spine is developed, longer than the dorsal fin spine, with small serrations at the front edge. The trailing edge has rough serrations. The ventral fin is fan-shaped, and the end is much smaller than the starting point of the anal fin. The fat fin is very long, about 3 times as long as the base of the gluteal fin, with the starting point close to the dorsal fin and the end not free, and there is a notch at the junction with the base of the caudal fin. The caudal fin is concave, and the upper leaf is slightly longer than the lower leaf. The anus is close to the base of the pelvic fin, but far from the starting point of the anal fin. The body is bare and scaleless. The lateral line is straight. The body side is gray-black, and the body color is darker above the lateral line. The abdomen is white. Some individuals have dark brown spots on both sides of their bodies. Japanese pike is a common primary ornamental fish.