In front of the seed pond, the pond with sufficient water can be drained first, dug off thick silt, and keep 10 to 15 centimeters of silt. Eradicate weeds around the pond, block the pool loopholes, and change the shallow water to deeper water. Storage capacity, expand the number of seedlings. Water ponds that are difficult to enter (note) water and that cannot be drained should be sterilized with drug clear ponds to kill predators and pathogens. Qingtang disinfection of commonly used drugs are lime, bleach and tea cakes. The role of quicklime is to improve sediment quality and water quality, neutralize acids, and increase pH; bleaching powder kills pathogens, eliminates excess plankton, and improves water quality; tea cakes remove wild fish. Seed before the lower pond should first check whether the effect of clear pond after the pass, early spring water temperature is low, the toxicity disappears slowly, fish test should be put in advance.
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