In the breeding process of Astragalus, we must pay attention to the following points: 1 It must be well managed in daily life. A layer of loose mud should be laid on the bottom of the pool, and a food table should be designed to facilitate the removal of residual baits. Feeding should be based on the eating habits of Astragalus one each morning and evening. Pool water should not be too deep, pay attention to constantly change the water. A small amount of water lotus should be placed on the surface of the water to protect the sun from shading and light, and it is convenient for the yellow toad to hide in the hot season. 2 For those who have not succeeded in the initial production, the relatives should not be discarded. They can continue to feed and elicit production again. 3 After injecting oxytocic agents into relatives, care should be taken to check and timely fertilize the eggs, otherwise the eggs will be wasted if they are immature or overripe. The effect of injecting oxytocic agents into thoracic cavities is good, and most of them can produce oxytocin smoothly. The dose of LHRH-A injected per gram of fish was half that of females. 4 eggs should be mixed first in Renshi liquid, add water to activate sperm after 5 seconds do not stir, so as not to affect the completion of fertilization. 5 During the hatching of the water injection, it is necessary to increase the speed of water droplets as the incubation time increases to ensure the required dissolved oxygen and inhibit the growth of water mold. However, early (day 1) water droplets should not be too fast, otherwise it will affect the cleavage and blastocyst formation, and may lead to the emergence of deformed seedlings. After the organ formation period (day 4), the oxygen demand of the embryos increased significantly. At this time, the speed of the water droplets should be adjusted to more than 3 times the initial time. 6 The hatched fine sand should be carefully screened. There should be no glass or other debris, so as not to scratch the egg membrane and cause spawning. The particle size of fine sand should be as consistent as possible. There are two biological significances for sand laying in the bottom of the hatching container: Firstly, the tiny friction between the vibration caused by the falling of the water droplets and the sand particles can inhibit the growth of water mold to a certain extent. The second is that the embryonic body in the filming period is intense, and the water droplet velocity is also greatly increased. The embryo body constantly rolls on the sand surface, which increases the friction and facilitates the timely rupture of the egg membrane. The embryonic body is normally filmed. If the embryo body can not be removed after a long period of intense activity, then use a syringe needle to carefully pierce the egg membrane and perform "manual midwifery." 7 During hatching, inspections should be conducted day and night to strengthen management. The hatchlings should pay attention to timely transfer and rearing so as not to damage or affect the hatching of other eggs or loss of water. After the yolk sac is absorbed, it can be fed into a seedling cultivation pond. (To be continued)