The fertilized eggs were buoyant and were placed in a conical cage. The size of the cage was 80 cm in diameter. The height of the box is 60cm and the height of the cone is 40cm. The oviposition densities were 1.1 million grains/m3 to 500,000 grains/m3. Bottom air stone is inflated. The amount of aeration is based on the fact that the water body in the net can turn slowly and uniformly. The hatching water is best filtered by precipitation. Change water 2-3 times a day and update one full amount. Wash the wall once every 2 hours to prevent the embryos from hanging on the wall and remove dead individuals in time. The incubation time varies with water temperature, and larvae hatch after about 3-5 days. As long as you maintain clean water and adequate dissolved oxygen, you can get 80% of the hatching rate.