To inspect the pond at night or before dawn, it must be carefully observed whether the fish floats. At night, a flashlight can be used to illuminate the surface of the pond or make a sound in the windward position. If the fish is disturbed, it indicates that the fish has floated; the following wind is frightened, indicating that the fish are eating. Use a flashlight according to the edge of the pond. If there is a lot of shrimp or fish in the surface of the pond, or if there are floating seeds on the surface of the water, it indicates that the head has floated. The degree of floating head can be judged based on the time of starting the floating of the fish, the location of the floating head, the size of the floating head, and the type of floating fish.