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Adjusting the water temperature When the water temperature in the paddy field rises to 32~35°C, the new water should be cooled in time. First, make a good level of water gap, while irrigation side row, until the water temperature drops and then increase the height of the water gap, the water level increased to 10 to 20 cm. Clearing the high-temperature water blooms, long-term storage of fish in rice paddy fields often float a layer of emerald green membrane, namely "bloom." In this case, 0.7 grams of copper sulphate per cubic meter of water can be eliminated by mixing it into an aqueous solution. Preventing oxygen deficiency often adding new water to rice fields can increase the amount of dissolved oxygen in the water and prevent fish from “floatingâ€. If the "floating head" phenomenon has already occurred, the amount of fresh water injected should be increased. When you want to avoid draining dried rice fields or drying up the rice fields, you should first clear the fish ditch (fish pits, fish ponds) so that they will maintain a certain depth of water storage, and then gradually drain them so that the fish can freely swim into the fish ditch. Avoid draining too quickly and cause the fish to dry and die. Prevention of Escape from Fishes often inspects paddies and inlets and drains in rice fields and finds that landslides and leaks must be repaired in time. Before storms or floods arrive, it is necessary to set up and reinforce protection facilities such as fences to prevent fish from escaping.