1, to maintain adequate water space: broodstock larger individuals and physiological conditions determine the need for spacious water space in order to meet its growth and gonadal development needs. This is because in the case of abundant water, it can effectively delay or reduce the pollution of water quality by organic load, store more dissolved oxygen, and maintain a relatively stable water temperature, creating a good environment for gonad development. After the broodstock is quarantined, new water should be added in time to raise the water level to meet the demand of the broodstock for water. Another advantage of early water injection is 15 cm. As the water temperature rises, the water level gradually increases. When the water temperature rises to 18°C, the expected water level is reached. 2, to maintain a slightly alkaline water environment: Recent studies have shown that the slightly alkaline water environment is conducive to the proliferation of broodstock gonad cells, but also to maintain the normal structure and function of the gonad gonad tissue and organ and gonadal cell development necessary conditions. Maintaining the water quality of the broodstock pool is slightly alkaline, which is beneficial to the breathing of the broodstock and is an effective measure to increase the reproductive success rate. Pro-fish ponds generally should not use quicklime. A simple and effective way to maintain slightly alkaline water quality is to splash lime slurry in the fish pond and adjust the pH of the pool water to between 7.8 and 8.5. Generally, the amount of cooked lime slurry is 30-50 g/cubic water. 3. Maintain appropriate phosphate concentration: The experiment shows that when the phosphate content in the water is suitable, the effect on improving water quality is extremely significant. Phosphate and calcium combined to form a weak acid calcium salt buffer system, can play a role in regulating and stabilizing the pH value, enhance the water buffer function, prevent the pH from changing frequently and adversely affect the broodstock; the appropriate phosphate concentration can also be increased. Phytoplankton photosynthetic intensity under low temperature conditions in early spring, absorbing carbon dioxide, increasing dissolved oxygen content, which is the biggest driving force to improve water quality. The second is to improve and enhance the metabolic activity of fish and promote gonad development. The main function of phosphorus in fish is to store ATP (adenosine triphosphate) in the form of high-energy phosphate bonds to promote energy metabolism. Most of the fishery production in China adopts the method of applying phosphate fertilizer to increase the concentration of phosphate in the water. It is better to choose primary superphosphate containing 18% of available phosphorus or secondary superphosphate containing 16% of available phosphorus. Because the demand for phosphate in the broodstock pool is much higher than that in the general fish pond, the application amount of phosphate fertilizer is calculated to be 0.6-0.8 grams of effective phosphorus per cubic meter of water. 4. Maintain adequate dissolved oxygen: Production practices have shown that broodstock weighing more than 5 kilograms begins to float when the dissolved oxygen in the water drops to 2.2 mg/litre; when the water continues to fall to 1.8 mg/l, the larger brooders begin to die. Below 1.5 mg/l, a large number of brooders have died. Therefore, 2.0 mg/L was defined as the dissolved oxygen threshold of the broodstock. Especially during the spring cultivation, an oxygen-deficient floating head accident must not occur. From the perspective of reducing the risk of breeding and increasing economic efficiency, when the water temperature is above 18°C, the ideal value of dissolved oxygen in the broodstock is 5-7 mg/l. When dissolved oxygen in water drops to 3.5 mg/l, comprehensive measures should be taken to increase dissolved oxygen: First, appropriate quantified fertilizer should be applied to cultivate phytoplankton to produce oxygen. 90% of the oxygen in the water comes from photosynthesis of phytoplankton, abundant phytoplankton water, high dissolved oxygen content, and good broodstock development. This is a cheap, simple and efficient oxygenation measure, and it also provides some food for filter-feeding fish. The application amount of chemical fertilizers is: 3 to 4 kg of ammonium bicarbonate applied per acre of water surface at the initial stage, and 2 to 3 kg of superphosphate are used in combination with 3 to 4 consecutive applications to make the water appear pale green and continue to be topdressed to maintain this color. Must not increase the amount of chemical fertilizer to make the water more fat. The second is the rational use of aerators to achieve a comprehensive use of biological, chemical, physical oxygenation and improve water quality. Each acre of water should be installed with a 0.3-0.4 kW aerator, and it will continue to operate for 2 to 3 hours per day to give full play to the function of the aerator, so that the dissolved oxygen content can be stabilized at 5 mg/L or more.