How to deal with a series of diseases caused by continuous high temperature weather?

Properly extend the start-up time of aerator, promote the flow of upper and lower water bodies, and alleviate hypoxia.

The solubility of gas, especially dissolved oxygen, decreases in aquaculture water with high water temperature, so almost all ponds are prone to anoxia during high temperature period, and many ponds with large water storage capacity are more serious. The weather is hot and the upper layer of the pond is strongly illuminated. Although there is a lot of oxygen produced by algae photosynthesis, the gas solubility is low because of the high water temperature. The lower water body has insufficient illumination, weak oxygen production capacity and insufficient dissolved oxygen in the pond. During the high temperature period, the temperature difference between the upper and lower water bodies is large, forming thermocline. If the aerator is not turned on at this time, the supersaturated dissolved oxygen in the upper water body cannot enter the lower water body. At night, the surface water temperature drops rapidly, forming density circulation, and the bottom oxygen-consuming substances turn up, which leads to serious hypoxia in the pond.

Therefore, it is necessary to extend the start-up time of the aerator in the high temperature period during the day to promote the exchange of upper and lower water bodies and help alleviate the lack of oxygen in the pond in high temperature weather. Comparatively speaking, impeller aerator is more effective!

Appropriately deepen the water level or reduce the density to improve the "carrying capacity" of the pond.

Having good water source conditions, often replenishing fresh water and keeping deep water level can effectively reduce pond pollution, improve water purification capacity and keep water fresh. If the water level of the pond itself is too shallow, the aerobic capacity is not enough, and the water is in a turbid state for a long time, it is suggested that the culture density must be reduced; If the load of the pond is not high, but the water is shallow, you can spread a shading cloth on the material table, which is beneficial to promote the fish to eat.

When the water temperature is high, the growth and metabolism of almost all organisms in the pond will be accelerated, including common cultured animals, algae, beneficial bacteria and harmful bacteria in the pond. In the process of pursuing intensive feeding and accelerating the growth of cultured animals, it is very important to strengthen the frequency of pond bottom changing to avoid serious hypoxia after pond bottom changing. For example, it takes 10 days to change the bottom of a pond with 10 mu of feed every day, and it takes at least 5 days to change the bottom if two bags of feed are fed every day in high temperature period. ?

Before fertilization, water quality indicators and algae components should be tested, and a small amount of fertilizer should be supplemented several times, and carbon and bacteria should be supplemented appropriately.

Under the condition of high water temperature, the rate of algae using various nutrients in water is accelerated, and the effect of cultivating algae will be more significant no matter which fertilizer is used. Most customers also know that fertilization should be carried out regularly during this period, but the color of the fertilized water is not very beautiful, or it is not lasting, and even the water is too fat, resulting in lack of oxygen in the pond. In view of these situations, it is suggested that pond water must be brought to Liyang Aquatic Pharmacy before and after each fertilization to detect the species composition and vitality of algae in the water, not just the number of algae. When the weather is hot, the pond is fed too much, and ammonia nitrogen or nitrite is easy to be too high. If the fertilizer with high nitrogen content is blindly supplemented at this time, the composition of algae will only become more and more single. Even if there are a lot of algae, this kind of water is extremely unstable. Therefore, it is necessary to detect the physical and chemical indexes of water and the composition of algae before fertilization.