In the rainy season, due to frequent rain and lack of light, surface dirt, mud, etc. flow into the ponds with rain, often causing the following hazards to the crayfish:
(1) Change the water quality. Due to lack of light, dirt, dirt, etc. flow into the shrimp pond, causing the growth of algae in the aquaculture water body is not prosperous, the self-purification capacity of the water body is reduced, and some algae sink and die due to prolonged light insufficiency and flocculation of the soil, and under the action of microorganisms The anaerobic decomposition produces harmful substances such as nitrogen, nitrite, and hydrogen sulfide, which increase the concentration of these harmful substances in the water, cause chronic or acute poisoning of the crayfish, and can easily cause crayfish that are being shelled or have just finished oyster shells. Cause death.
(2) Induced disease. Insufficient light for a long time will cause the crayfish's ability to absorb calcium and its ability to reduce immunity. After continuous rainy days, it often causes crustacean ecchysis and soft-shell disease.
The organic matter in the water body and the sinking dead algae and the surface dirt that flows in with the rainwater cause the deterioration of the water quality under the action of microorganisms. The large number of pathogens will cause the disease to occur.
In view of the above situation, in the crayfish culture in the rainy season, the following measures can be taken to prevent:
(1) Before the onset of the rainy season, 0.3 grams of strong chlorine was used per cubic meter of water.
(2) Use 1 quicklime disinfection every 10 days, depending on the water quality, use 10-20 grams of quick lime slurry per cubic meter of water.
(3) After using the disinfectant for 3 days, 500 grams of photosynthetic bacteria freeze-dried powder is used for 1 meter water depth per acre, against clean water, choose sunny noon, or use 100 watt incandescent lamp for about 2 hours to activate photosynthetic bacteria after Quanchiposa, Use it once every 15 days or so.
(4) For several consecutive days of rain, 300 grams of EM bacteria powder can be used for 1 meter of water per acre. After the water is activated, another 200 milliliters of shrimp (Kelly bacillus) is splashed.
(5) When the area covered by aquatic plants in the pond exceeds 1/3, the excess part is manually removed to increase the light area of ​​the pond.
(6) Feeding high-quality feed, according to the weather, water quality, etc., do a good job of "four definite" feeding, and add 0.25% immune polysaccharide, 0.1% high-stable vitamin mixed feed in the feed.
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