According to the experience of searching Baidu, the copperhead fish in Hai 'an are commonly known as "mandarin fish" and mandarin fish (pronounced as G M N), also known as yellow diamond, yellow cheek fish, rod fish, water tiger and big mouth fish. It looks like a shuttle, its body color is light yellow, its abdomen is silvery white, and its dorsal fin and caudal fin are bluish gray. Mandarin fish are widely distributed in China, mainly living in rivers, lakes, reservoirs and other waters. It is a carnivorous fish with fierce nature and often attacks other fish.

Morphological characteristics of Siniperca chuatsi: large and fierce fish. It is long and shaped like a shuttle. The head is tapered. The tip of the kiss is long, the mouth is in the end position, the mouth is cracked, and the kiss is longer than the kiss width. The hypopharyngeal teeth are flat and the tip is hooked, with 3 rows. There is a sharp bony protrusion at the front top of mandible, which is embedded with the depression at the front end of maxilla. Small eyes. Sparse gill rakes. No need. Abdominal gyrus. Small in scale. The lateral line scale is above 100. The dorsal fin starts from the back of the ventral fin, the pectoral fin does not reach the ventral fin, the ventral fin does not reach the gluteal fin, and the caudal fin is deeply forked. The body color is light yellow, the abdomen is silvery white, the dorsal fin and caudal fin are bluish gray, and the other fins are yellow.