First of all, from the beginning of spring, after the Spring Festival, the temperature rose steadily. At this time, crayfish farmers need to strengthen the inspection of the pond. When the water temperature reaches above 10℃, crayfish will climb out of the cave to feed. This is the critical period for crayfish breeding. Superior technology has sorted out five key points, and grasping these five key points will make you safely pass the critical period of crayfish culture. 1, add water and fertilize, and add enough water in the pond at one time to stimulate crayfish to come out of the hole and let them eat early and grow early; At the same time, letting all the overwintering crayfish come out of the hole together is conducive to cultivating lobster seedlings with neat specifications. After adding water, apply fermented organic fertilizers such as chicken manure, pig manure and cow dung, with an area of about 100 kg per mu, so as to cultivate rich plankton for shrimp larvae to eat. In the future, organic fertilizer should be applied once a month according to the specific situation of the water quality of fat and thin ponds to ensure the stability of the water quality of ponds and maintain the high density of plankton in the water. 2. Feeding crayfish as soon as possible is an omnivore, and both plant and animal bait can be successfully fed. However, crayfish after wintering are relatively weak and need a lot of food and nutrition to fatten and grow. Therefore, it is best to feed crayfish after eating more animal bait, such as fresh miscellaneous fish and snails, which can not only improve the satiety and survival rate of parent shrimp, but also help parent shrimp breed young shrimp. Of course, when feeding animal feed, some plant bait should also be properly matched. At this time, it should be noted that the water temperature is still relatively low and crayfish eat less. Be sure to pay attention to the feeding. Because it is difficult to estimate the number of shrimps in the pond, we should feed them according to the weather conditions and follow the principle of feeding more in sunny days and less in rainy days. Generally, it is appropriate to control the feeding amount within 2 hours, and feed it 1 time in the morning and evening. In the middle and late March, snails are released, with an area of 0/00 kg ~200 kg per mu/kloc, so that a batch of snails can be fed to young shrimps before and after Tomb-Sweeping Day. You can't put too many live snails in early spring. 3. Grasp the big ones and keep the small ones to reduce the density. After feeding for half a month, in order to reduce the density of crayfish, crayfish that meet the market specifications (do not catch shrimps with eggs) should be caught and sold. Suggestion: Use a ground cage with a slightly larger mesh, otherwise the mesh is too small, which will trap the young shrimp in the cage and affect their normal feeding and growth. 4. The transplanted aquatic crayfish like aquatic buds born in early spring very much. Therefore, it is necessary to strengthen feed feeding, reduce crayfish's intake of water bamboo shoots, and ensure the germination and growth of water bamboo shoots. For some ponds with few aquatic plants, aquatic plants such as Sophora alopecuroides, water hyacinth and Alternanthera philoxeroides can be transplanted into the pond in the middle and late April, and Alternanthera philoxeroides should be placed along the edge when transplanting. 5. Daily management In order to check the feeding and activities of crayfish, the pond should be inspected once every morning and evening. If there is leakage or shrimp escapes from the pond, the problem should be dealt with immediately.