In summer, the temperature of pond water body is high, the temperature difference between day and night is large, the temperature difference between the upper and lower parts of the water body is obvious, and the water quality changes rapidly. Especially when the continuous high temperature occurs, the stress reaction of cultured fish under the influence of environmental changes is intensified, and the resistance is reduced, which is very easy to cause the occurrence and prevalence of diseases. In the process of breeding in summer, the following points should be paid attention to in the management of fish ponds and the prevention and treatment of fish diseases:

1、 Scientific feeding enhances the resistance of fish.

a. Increase the number of baiting machines to expand the baiting area to avoid a large number of fish feeding in one place; For ponds with a water depth of more than 2 meters, the feeding time should be reduced, and the feeding time should be 20-30 minutes.

b. It is necessary to adhere to the "fixed quality, fixed quantity, fixed time and fixed position" feeding, ensure the feed quality, supplement the vitamins and trace elements of the fish body, and improve the resistance of the fish body.

c. The method of hanging bags and baskets is often adopted around the food field, and copper sulfate, bleaching powder and other disinfection and sterilization insecticides are used to prevent the infection of pathogenic bacteria.

2、 Regulate water quality and improve the breeding environment.

a. Add new water regularly and properly. Generally, add water or change water once every 7-10 days. The water level shall be kept at 1.5-2 meters with each change not exceeding 25 cm. When filling new water, avoid flushing the bottom mud.

b. Frequently use Cairo wind turbine to promote the exchange of upper and lower water layers or water circulation. Start up for 2-3 hours at noon every day. c. Sprinkle quicklime once every 10-15 days at the dosage of 30-50 Jin per mu to improve the water quality; Use photosynthetic bacteria, bacillus and other microecological agents every 10-15 days to improve the microbial ecological environment of aquaculture water. After the application of microecological agents, try to avoid the application of drugs.

d. Lay more nano oxygenation aeration tubes and aeration disks at the bottom to make the pond have enough oxygen from top to bottom.

3、 The breeding density should be scientific and reasonable.

It is necessary to release fish species according to the pond conditions, supporting conditions and technical level, or adopt the method of catching large fish and keeping small fish before the high temperature season, instead of using the method of pulling net in the whole pond. It is recommended to set a lifting net near the food table in the high temperature season to catch large fish and release small fish, which not only reduces the breeding capacity, increases the fund flow efficiency, but also reduces the impact on the fish body, water quality and pond ecology.

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