(b) Winter management of fresh shrimps During the winter period from December of each year to March of the following year, it is possible to use winter ponds or cages for wintering: the pond area is 1 to 2 mu, and the water depth is 1.5 meters or more; the area of ​​cages is 50 to 100 square meters. 1.2 meters deep, pond water, water, peanuts, water hyacinth and other plants, the cage can be put some brown, willow root or other aquatic plants. Stocking densities can put 5 to 10 tails per square meter, and 15 to 20 tails can be placed in running water or inflatable pools. During the winter, the broodstock is rarely active and occasionally comes out of the diet. The key is to maintain the river water quality and prevent predators.
(III) Incubation (1) Pond Incubation: The pond area is 0.5 to 2 mu and the water depth is 1 to 1.5 meters. The sediment quality is better for silt and the floating mud should not be too much. In the pond, some water-repellent and water-repellent plants are planted, accounting for about 1/4 of the pool surface. In April and May, 500 to 800 females are stocked per mu, and 300 to 500 males are reared: 5% of the body weight is dropped every 2 days. 1 fine feed. At the water temperature of 20°C, the first batch of prawns hatched about 10 days after the brooding broodstock went down.
(2) Incubation of cages: First, a net cage with a mesh area of ​​196 mesh per square centimeter is used to make a large cage with an area of ​​about 70 square meters and a height of 1.7 meters, and 2 to 3 square meters of plants are placed inside. Place two small cages of 2 cubic meters of water in large boxes. The mesh is 9 mesh per square centimeter and a small amount of plants are placed in the box. Each cage holds 200 to 300 female eggs. After about 1 week, the larvae hatch out and the small boxes are removed. The larvae in the large boxes are fed with soy milk twice a day, and a small amount of bran and peanut cake are added after half a month. , about 25 days after emergence.
(3) Indoor pool hatching: The cement pool is 0.8 to 1 meter deep, well water is better, and the dissolved oxygen is kept at about 8 mg/l: the stalk of the broodstock side is cut off from the base and the knife edge is disinfected with 70% alcohol. After being put into the spawning pool, put 8 to 10 pairs of broodstock per cubic meter of water and feed some concentrated feed every day until the males are released after spawning. Keep the female eggs in the hatchery and keep them in the pond until the eggs are hatched more than 80%. After about 1 month of cultivation, the shrimp can be cultivated when it reaches 1.5-2 cm.
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