There will be rainy weather after the typhoon. What effect will this have on the aquaculture pond?

Rain and wind make the pond environment change dramatically, the PH value, water temperature, salinity and dissolved oxygen decrease, the pond is stratified, and algae multiply. In this case, the habit of shrimp makes it choose to stay in the sewage area, which happens to be the source of toxic gases such as hydrogen sulfide, so the shrimp will become dull, weak and have low immunity, leading to partial death; The crab pond will cause aquatic plants to float because of the rising water level and the action of wind; The decrease of dissolved oxygen in fish ponds leads to algae lodging, floating head and even flooding.

Second, salinity.

For mariculture, in the case of heavy rain and continuous rain, a large amount of rainwater enters the pond, which will lead to a sharp change in water salinity. In fact, the sudden drop in salinity has a great influence on mariculture. At this time, the cultured animals will have strong stress and are easily infected by pathogens. At this time, the surface water with low salinity can be pumped out, as well as minerals, lime, salt and so on. It should be replenished when the rainfall continues to ensure sufficient mineral content in the water body. Calcium carbonate can be used to maintain the ideal total alkalinity, and calcium oxide or calcium hydroxide can stabilize the PH value.

Third, strong winds and the sound of rain

Strong wind greater than 15km/ h will make the water surface and water body of the pond fluctuate, and the up-and-down circulation of the pond water body will be intensified; Usually, the bottom surface of the pond is covered with oxidized organic matter. This layer of white-gray oxide is like a protective film, which separates the black part that is not completely oxidized (anaerobic) and can release toxic gases such as hydrogen sulfide. When a strong wind blows, it will destroy this balance, release toxic gases, aggravate the deterioration of the bottom environment, and produce anoxic floating heads.

When the rain drops on the surface of the pond, the sound generated by the rain drops will make the cultured animals stress, reduce their food consumption and swim to the bottom of the pond with low dissolved oxygen and toxic gas accumulation. For shrimp, due to the decrease of PH value, some shrimp will shell, and at this time, 1.4 times the usual oxygen consumption is needed. As a result, soft-shelled shrimps often die after rain; Moreover, fish ponds often appear anoxic floating heads, even flooding. The treatment method is also to improve the bottom environment of the pond, increase the dissolved oxygen in the water, and maintain the stability of the water environment as much as possible, so that the harm caused by strong winds will be reduced.

Fourth, pH.

The PH value of rainwater is generally 6-7, and it will be lower if it is near the factory. Low PH value will lead to shrimp and crab shelling, algae decline, and make pond water turbid. Suggested method: use calcium hydroxide in the pond embankment to stabilize the pH value in the pond in rainy season or prevent rainwater from entering the pond from the pond embankment. In short, the practice of rain insurance is to stabilize PH value.