Water quality deterioration is prevalent in summer, management of summer fish ponds and prevention and control of fish diseases

The temperature is high in summer, the temperature difference between day and night is large, the temperature difference between the top and bottom of the fish pond is obvious, and the water quality changes rapidly, especially when the temperature is continuous, the stress reaction of the fish in the fish pond is intensified and the resistance decreases, which leads to the prevalence of fish diseases and fish culture in summer. it is necessary to do a good job in fish pond management and fish disease prevention and control.

Fish pond disinfection

First, scientific feeding to enhance the resistance of fish.

The main results are as follows: 1. Increase the feeding amount and enlarge the feeding area to avoid a large number of fish gathering in one place to feed; if the water depth is more than 2 meters, the feeding time should be reduced, which is suitable for 20-30 minutes.

2. It is necessary to adhere to "qualitative, quantitative, timing and positioning" feeding, ensure feed quality, supplement vitamins and trace elements to fish, and improve fish resistance.

3. Hang bags and baskets around the food farm and use disinfectants such as copper sulfate and bleach to prevent pathogens from infection.

Second, regulate the water quality and improve the culture environment.

1. Add an appropriate amount of new water regularly, usually add or change water once every 7-10 days, each time the water does not exceed 25cm, and keep the water level at 1.5-2 meters. Avoid flushing the sediment when adding new water.

2. Turn on the aerator frequently to promote the exchange of upper and lower water layer or water circulation. Power on for 2-3 hours at noon every day.

3. Sprinkle quicklime at the dose of 30-50 jin per mu every 10-15 days to improve water quality, and 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 use of drugs.

Third, the breeding density should be scientific and reasonable.

The fish species should be released according to the conditions of the fish pond, supporting conditions and technical level, as far as possible, or the method of catching large and staying small should be taken before the advent of the high temperature season, and the way of net fishing in the whole pond should not be adopted. it is suggested to set up net fishing in the accessories of the eating table in the high temperature season, which can not only reduce the aquaculture capacity, increase the capital flow efficiency, but also reduce the impact on fish body, water quality and pond ecology.