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Prawns are sexually mature and have strong fertility. They breed eggs each fall. In the autumn, the majority of the nutrients eaten by the broodstock are used for embryonic development, and the growth rate naturally slows down. Furthermore, the large number of autumn crops and broodstock that compete with the broodstock to compete for space will inevitably restrict each other's growth. By the end of the year when the fishermen were listed on the market, shrimp generations accounted for a large proportion of shrimps, the specifications were difficult to increase, and they were very uneven. Therefore, the control of over-blanching of green shrimp is one of the means to increase the commodity rate of the shrimp and increase the economic benefits of the culture. To purchase quality seedlings to purchase fresh seedlings from the Qingyuan shrimp farm, avoid avoiding the cost of the province and breeding for many years to avoid repeated inbreeding. The harmful genes of the shrimp are continuously homozygous, making the seed quality worse and worse, and sexual maturity. More and more early, commodity shrimp specifications are getting smaller and smaller. Neutron irradiation of young shrimps was irradiated with low-dose neutron radiation to irradiate 0.8-l cm shrimp seedlings. By activating the activity of polymerase in the larvae, the development of gonads in the shrimps was delayed. Control the water temperature of the pool to increase the pool water level to more than 1 meter in summer and autumn, and increase the area covered by aquatic plants in the pool. Using this method can delay the gonadal development time of the shrimp by controlling the effective accumulated temperature in a certain period of time. When controlling the frequency of water exchange, change the water every 7-10 days, and change the total amount of pool water by 1/4 each time. Changing the water level will speed up the development of the gonadal of the shrimp due to frequent water flow stimuli. Delaying the release of seedlings from the fifth to the sixth months of stocking will result in the production of a large number of young shrimps in September. The time of stocking is selected when the shrimps are going to be in full bloom, that is, in the first half of July, the seedlings will be planted. By changing the living environment of the shrimps suddenly, the autumn cropping phenomenon will be controlled to some extent. Sprinkling lime water per 667 square meters with quicklime 20-25 kg slurry Quanchiposa, through lime water to a certain extent, quickly increase the pH value, so that the young juvenile larvae and not yet abnormal zoea larvae exceed its tolerance death. Control the water quality of ponds In the autumn and fall season in September, the quality of pool water should be properly adjusted to “thinâ€, and the transparency should be controlled at 40 cm or more. In this way, shrimps that are produced will not have sufficient planktonic food and the survival rate will be greatly reduced. The oysters and breams were raised in the shrimp ponds and they bred about 20 kilograms of oysters and 10 kilograms of fish per kilogram. Cockroach and carp species filter out most of the plankton in the pool, and the sickle-like larvae before the metamorphosis of the shrimp are the “meals†of the carp species. This method can also control the number of young plants to a large extent. .