Oxygen must be in place for continuous rainy weather, lack of sunlight, photosynthesis oxygen production is almost stopped, aquaculture water dissolved oxygen is in a state of extreme lack, at this time oxygen is the core of aquaculture regulation. The first task is to provide high-quality algae, cultivate plankton, make the water yellow-brown or green, and the transparency of the water is 25-30 cm. On sunny days, an aerator is opened for 1 to 2 hours at noon to promote the convection of upper and lower aquifers, so that the water with high dissolved oxygen content enters the bottom layer. After 11 o'clock in the evening, the aerator will be opened for 4 to 6 hours. During the rainy days, the boot time will be extended, and the upper, middle, and lower levels shall be increased. In particular, it is necessary to pay attention to the oxygenation of the bottom layer so that there is enough dissolved oxygen in the water layer of the aquaculture water. Maintain material and energy cycles.

Adjusting the pH value of heavy rain or continuous rain caused acidification of the pool water, which is not conducive to aquaculture. Before the rainstorm approached, sprinkle lime properly around the pond foundation to adjust the pH value of the rainwater entering the pond and kill the bacteria brought in by the rainwater. After heavy rain, sprinkle 15 to 20 kg of quick lime per acre to effectively adjust the pH value. With liquid photosynthetic bacteria and EM bacteria, quickly remove hydrogen sulfide, organic acids and other harmful substances, balance the pH of water.

The reduction of ammonia-nitrogen and other harmful substances caused by the overcasting of rain may cause the lack of dissolved oxygen, resulting in the obstruction of circulation of water bodies, drastically increasing the content of harmful substances and endangering the health of aquatic animals. In combination with increasing oxygen, microbiological preparations applied to the water can effectively reduce the content of ammonia nitrogen and nitrite.

Feeding management First, the dead fish, shrimp, and crabs should be picked up from the aquaculture waters, buried deep, and dealt with to prevent the spread of diseases and outbreaks. Second, ease the stress response of shrimps and crabs, conditionally change the surface water, or splash it with 15 kg per acre of saline water. Third, promptly use fresh, high-quality feed to supplement the nutrition of fish and shrimp, restore the constitution of fish and shrimp, and improve the immunity and anti-stress ability of fish and shrimp. Fourth, take appropriate disinfection measures. After a heavy rain, the water body should be disinfected with a low-stimulus disinfectant, and cage culture can be used to disinfect the water body by means of hanging bags. The fifth time to make up the seedlings. To find out as many fish stocks as possible and supplement seedlings in time, seedlings should be disinfected with 2%~3% saline before stocking to ensure the total output of the end-of-year fish and minimize the loss.

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