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Technical measures to increase spawning of jaundice
(A) Select the venue. To simulate the natural ecological form, plant aquatic plants in the breeding ponds, such as water peanuts, water lettuces, etc., and put some stones and bricks at the bottom of the pond to facilitate spawning by the nymphs. (B) adjust the water quality level. The pond water cultured by A. sinensis must be non-toxic river water, stream water or groundwater. The pH of the water should be between 6.2--7.8 and a water depth of 20-30 cm. The newly excavated ponds are also subject to dealkalization. (3) The stocking density should be appropriate. Individuals of A. sinensis should be moderate, and it is best to choose 100--150 grams of astragalus for spawning and intimacy. The proportion of males and females is 1:3. The stocking density is about 10 per square meter. Too much of it also affects the amount of eggs laid. (4) Feeding feed should be reasonable. In the breeding season of Astragalus in April-September, feeds with higher protein content, such as alfalfa, should be fed, and at the same time, they should be used in combination with Astragalus mongolicus. Sexual mating nymphs are spawned on high-protein diets for 5-7 days. Eggs are laid on the side of grass or stones. As long as there is a white foam, pro-spawning ovaries are produced. (e) master the water temperature. During the spawning season of the oystercatcher, the patrol pool is to be patrolled every morning in the pro-Huangqi Lake. If a white foamy ovary is found, it should be gently moved into the hatchery and incubated with microfluidic water. The fertilized eggs inflated to about 4 mm after inhalation of water. The incubation time varies from 1 to 7 days depending on the temperature of the water. When the water temperature is 25°C, all incubations are completed within 6 days. After the hatching of the seedlings, the water temperature is 28°C for about 10 days, and the body length is about 26 mm. The yolk sac has not completely disappeared; the yolk sac will be completely absorbed after 10 days at 7°C, and plankton in the water will start to be ingested. Feed the small leeches. After about 35 days, the young larvae grow to 5--6 cm and can be placed in feeding ponds. (6) Timely quantitative feeding. No matter whether it is spawning crickets or young hatchlings, it should be fed regularly. Spawning Astragalus membranaceus is fed 2 times a day, about 8 o'clock in the morning, and about 1 o'clock at 6 o'clock in the afternoon. The amount of each feeding is 2% - 3% of the total weight of A. erinaceus. Seedlings are fed once a day, and in the afternoon from 5 to 7 pm, feeding in this way is beneficial to the production of eggs from the nymphs.
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Identification of male and female Astragalus