In recent days, the temperature and water temperature have risen continuously, reaching 40 ℃ for many days, and the water temperature at 1m above the pond surface has reached 35.5 ℃, which is a severe test for the yellow catfish farmers. It is particularly important to do a good job in the daily management of the Yellow Catfish culture pond in the high temperature season. In order to ensure the aquaculture output, stabilize the industrial benefits of yellow catfish farming, reduce losses and increase efficiency, the key technologies of emergency management under the high temperature weather of yellow catfish farming are introduced as follows:

1. Keep the water level and reduce the water temperature

With the rise of the temperature and the long-term drought, the water temperature of the breeding pond also keeps rising. Therefore, in order to reduce the water temperature, the water level of the pond should be properly deepened at this time, and the water level should be kept above 1.8m. Add water appropriately every 3-5 days, and pay attention to the water level at all times. In addition, always pay attention to weather changes to prevent strong convection or thunderstorm. If the water level is too high and there is heavy rainfall, in order to prevent overflow of the pond, the water pump shall be used for drainage in time to reduce the water level. Shading shed or shading net can be built if conditions permit; Accelerate the flow of water, such as opening more aerators; Urea and other cooling products are used, but the disadvantage is that it increases the ammonia nitrogen content in the water body and can only be used for emergency cooling.

2. Regular disinfection and control of pathogens

In the high temperature period, due to the hot temperature and high water temperature, the organisms in the water are in the rapid growth period, especially the growth and reproduction of microorganisms are more vigorous, and bacterial diseases are the main diseases in this period. Chlorine dioxide or bleaching powder shall be used for disinfection every 15 days or so, and the dosage shall be controlled below 250G / mu · M. if quicklime is used for disinfection, the pH value of the water body shall be monitored, and the amount of quicklime shall be appropriately adjusted according to the pH value of the pond. When the pH value of the water body is below 6.8, 30kg / mu · m of quicklime can be used; when the pH value is between 8.5 and 9.5, the amount of quicklime used shall not exceed 15kg / mu · M.

3. Scientific feeding to prevent overeating

Due to the high water temperature, fulvidraco fulvidraco is also in a rapid growth period, with strong food intake, large appetite and eating too much. Hepatobiliary syndrome is also the main disease during this period. Therefore, do not let the fish eat too much, and try to control it to 70% or 80%. Especially in bad weather such as high temperature and rainstorm, the feeding amount should be reduced, or the feeding should be stopped once a week, so that the fish can have a proper rest. In addition, the feeding amount can be adjusted according to the varieties of cultured yellow catfish. The hybrid yellow catfish has higher high temperature resistance than the whole male yellow catfish. Generally, the water temperature exceeds 32 ℃, and the feeding amount of the whole male yellow catfish should be greatly reduced to 1 / 3 ~ 1 / 5 of the normal feeding amount; When the water temperature is above 33 ℃, the feeding amount of hybrid yellow catfish can be reduced to 1 / 3 ~ 1 / 5 of the normal feeding amount.

4. Ecological prevention and control, reduce accumulation

Due to the high water temperature, the algae in the water grow vigorously, and the dissolved oxygen in the upper layer of the water body is supersaturated, but the dissolved oxygen in the lower layer of the water body is often insufficient, mainly due to the thermal stratification, the large amount of oxygen consumption by the microorganisms in the bottom layer, and the large amount of feed. Therefore, the accumulation of harmful substances such as ammonia nitrogen and nitrite is also the main disease during this period. Reduce the accumulation of harmful substances such as ammonia nitrogen and nitrite. On the one hand, reduce the amount of feed; On the other hand, beneficial bacteria such as lactic acid bacteria and Bacillus should be taken orally to reduce the emission of harmful substances such as ammonia nitrogen and nitrite in the feed; The water that can be changed can be changed regularly; Regularly use microbial agents, such as photosynthetic bacteria and EM bacteria, to control the accumulation of ammonia nitrogen and nitrite in water; Regularly use carbon source products to promote nitrogen with carbon, so that beneficial microorganisms can consume nitrogen source in water.

5. Reduce oxygen consumption and increase dissolved oxygen

In high temperature season, if a large number of oxygen consuming microorganisms, such as bacillus, are used, the dissolved oxygen of the water body with insufficient dissolved oxygen will be lower, and the pond will be flooded seriously; On the other hand, oxygen consuming microorganisms will generate a large amount of heat during their growth and reproduction, which will make the water temperature higher and the dissolved oxygen lower. At this time, the use of oxygen consuming microorganisms should be reduced, and more oxygen generators should be opened, especially at noon, so that the bottom water can rise to the surface to increase the bottom dissolved oxygen. The bottom layer microporous oxygen increasing nano aeration tube, aeration disk, roots blower and other oxygen increasing equipment can be added to increase the bottom layer dissolved oxygen. In the evening or at night, oxygen increasing products can be used to increase the bottom layer dissolved oxygen.

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