The pond for raising Monopterus albus in greenhouse should be emptied and turned over one week in advance, and 20-30×10-6 bleaching powder or 0/80-220g of quicklime per cubic meter of water can be used to splash the bottom and wall of the pond, and then washed and added with water two days later, which can cause beneficial algae to enter the pond from the pond without diseases and cultivate the pond with clean water.

Second, heat preservation

When the water temperature drops to 15℃, it is necessary to implement heat preservation measures and use plastic film cover to keep the shed temperature. So that the water temperature will not drop sharply at night.

Third, feeding

Monopterus albus has poor digestive ability during wintering, so it should be fed with fresh feed which is easy to digest and which Monopterus albus likes to eat, such as small fish, shrimp, silkworm chrysalis, fly maggots, blood meal, fish meal and cooked internal organs of livestock. You can also feed some plant feeds, such as wheat bran, bean cake, rapeseed cake, rice bran, melon peel, etc., once a day. You should feed them at a fixed point, at a fixed time and quantitatively, and avoid overeating. You can't put too much feed, which is subject to eating it on the same day. When the water temperature is about 20℃, the amount of words is controlled according to different specifications to prevent enteritis.

Fourth, separate support

Monopterus albus cultured in greenhouse, because the water quality is clear, as long as the feed is sufficient, Monopterus albus generally will not escape, but attention should be paid to prevent natural enemies such as rats and snakes. After feeding for a period of time, the size of Monopterus albus in the same pond is uneven, so it is necessary to raise it separately in time, and the survival rate can reach over 90%.

Five, disease prevention

Monopterus albus likes to live in mud, so it is not easy to find out when it begins to get sick. Once it is found, the disease has spread, and the best treatment period has passed. Prevention and control of diseases must be given priority to. In addition to adding vitamins to feed to increase the disease resistance of eel, we should also pay attention to the following points: ① disinfection of eel. Before entering the shed, soak in1%~ 2% salt solution for 5 ~10 minutes (longer in low temperature, shorter in high temperature), and then rinse with clear water before entering the pool for feeding, so as to prevent water mold, capillary nematodiasis and eliminate parasites on the eel body surface. (2) careful operation, to prevent eel body injury. Injured Monopterus albus is susceptible to water mold when the water temperature is low. (3) pool water disinfection with 20 x10-6 quicklime water splash on a regular basis, so that the pH value of the water body reaches above 7. (4) timely remove sick and dead eels, burn them or bury them in the soil to prevent the spread of the disease.