1, try not to store water in winter, and it is in the state of clearing the pond. First of all, we should remove all kinds of omnivores that hinder crayfish culture, and receive ultraviolet radiation from the sun in winter to sterilize and freeze some harmful bacteria that are not tolerant to low temperature.

2. Common organic fertilizer 1000 ~ 2000 kg is applied to crayfish per mu, and decomposed fermented livestock manure is 500 ~ 1000 kg per mu and decomposed fermented livestock manure is 200 ~ 500 kg per mu.

3. After fertilization, 50 ~ 100 kg of quicklime or 5 ~ 100 kg of bleaching powder per mu shall be applied in the whole pond.

4. Use winter leisure to plant and cultivate aquatic plants in shrimp ponds. Fertilization should be dispersed as much as possible so as not to affect the growth of aquatic plants. After half a month, irrigation was started to create a fertile water source for crayfish culture.