The water quality of fish ponds is changeable in summer. Water should be raised before fish culture.

In summer, fish grow fast, feed input increases, water temperature increases, and fish metabolism increases, so the water quality of fish ponds changes greatly in summer, and fish are easy to get sick. Therefore, the quality of water quality is the key to the success or failure of raising fish in summer.

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Drug improvement. Use quicklime. Irregular application of fresh quicklime to regulate water quality can not only adjust the pH of the water, reduce toxic gases, inhibit the reproduction of bacteria, and prevent the occurrence of fish diseases. The dosage of quicklime is 15-20 kg per mu when the water depth is 1 meter, and the whole pool is sprinkled after pulping, usually once every 20-30 days. Second-use photosynthetic bacteria products. The use of photosynthetic bacteria can make the water quality fat, live, tender and cool, reduce and reduce the phenomenon of floating head and flooding pond of fish, prevent bacterial fish disease, improve the feeding and digestive ability of fish and enhance the immune function. Use it once every 20 days and sprinkle it evenly throughout the pool.

Turn on the aerator. Turn on the machine to adjust the water quality at 2: 3 p.m. on a sunny day to promote water convection, increase the dissolved oxygen in the pool water, and distribute toxic gases; turn on the aerator in the middle of the night on continuous high temperature and rainy days, but not in the evening; the time of turning on the aerator can be appropriately prolonged when the weather is muggy, and the noon time is shortened; when the weather is cool, the start-up time is shortened, and the start-up time of fish floating head in the middle of the night is prolonged.

Add new water. With the injection of new water, dissolved oxygen and nutrients are increased, organic matter and toxic substances are diluted, and the composition balance of pool water is restored. Generally, water is added or changed once every 10 to 15 days, and the amount of new water injected each time accounts for 1 / 3 of the total water in the pool. If the pool water is seriously deteriorated, it should be discharged 1 / 3 and then injected with new water. Water should be added before 2: 3 p.m. on a sunny day, and it is forbidden to add water in the evening, so as not to cause convection between the upper and lower layers in advance, and the fish will float due to lack of oxygen.

Stir the bottom of the tank. Method of operation: ① people go down to the pool and stir the bottom of the pool with a long rake or directly with their feet. ② dragged the rope over the shore. ③ mixed culture of bottom fish. Stir or turn the bottom of the pool once a week, when the weather is clear and windy, so as to avoid flooding the pool.

Control bait and fertilizer. Fish grow fast in summer, so we must strengthen bait so that the fish can have enough to eat. The suitable feeding amount is that the fish is full within 2 hours. Don't let the bait be excessive, or it will waste bait and pollute the water. In addition, according to the fat and thin situation of the pond water, fertilizers such as chemical fertilizer, green manure and manure are applied a small amount and many times. Generally, 200kg of human and animal manure or 300kg of green manure or 2kg of urea are applied per mu every 10 days, and chemical fertilizer is applied according to the proportion of nitrogen and phosphorus at 1:2. Can maintain good water quality.