Use a small box of "special kill" pesticides, dilute it with water to 50L, and then spray it on the edge of the pond or river, covering an approximate area of ??seven or eight acres. Generally, the best time to catch shrimp is between 4 and 5 o'clock in the morning. After about half an hour, you can catch a large number of shrimp floating on the shore. If you want to keep the shrimp alive, put the shrimp immediately in a place with live water flow. About 80% of them will survive.