Winter broodstock cultivation five points
Winter is the early stage of gonad development in broodstock. If it is poorly managed, it will affect the amount of brooding eggs in the broodstock, and it will have a greater impact on artificial hatching, seed production, and adult fish farming in the coming year. Therefore, the current broodstock breeder must grasp the following aspects. Pond selection Broodstock breeding ponds should be selected closer to the spawning pool and hatchery. Requirements of adequate water, fresh water, drainage and irrigation facilities, the surrounding environment is quiet, no pollution sources, supporting electricity and convenient transportation. Area of ​​(5-10) 667? Is appropriate, the soil to loam is better, water depth is 1.5 meters -2.0 meters, the bottom flat, less mud, good insulation, easy to pull the net operation. Qing Tong disinfection Drain the pool water, remove weeds and debris, excavate excess silt, level the bottom of the pool, and increase the height of the pool. The use of quicklime dry method, the amount of 75 kg -100 kg / 667?, to kill pathogens and wild fish and other predators. Broodstock stocking For ponds based on broodstock broodstock cultivation, the stocking specifications for broodstock broodstock are 5kg-8kg/tail, and the density is 10-15 pigs per 667 lbs. Three to five tails of broodstock with kilograms/tail; larvae reared with broodstock and broodstock, with specifications of 10 to 15 kg/tail, with a density of 10 to 15 tails/667? The stocking size is 10 kg/tail of grass broodstock with 3 tails to 5 tails; the grass-bred broodstock is the main pond, and the stocking size of grass broodstock is 8 tails to 10 kg/tail, with a density of 15 tails/667 feet. With stocking specifications of 5 to 8 kg/tail, 3 broodstock or broodstock, 10 to 12 kg of broodstock, and 15 to 20 kg of broodstock in a pond based on broodstock cultivation. , Density is 10 - 12 tails/667?, generally not with other species of broodstock. The proportion of males and females stocked by the broodstock is generally 1:1.5, which means that there are slightly more males than females. If there are fewer male and female fish, the proportion may be slightly lower, but not less than 1:1. Feeding management In ponds where broodstock and broodstock are mainly cultivated, sterilized and fermented organic fertilizers are applied 7 days to 10 days before the broodstock is stocked, and the amount of fertilizer applied is 200-300 kg/667 , to cultivate plankton, which is suitable for culturing plankton. The earthworms and earthworms provide biological foods. During wintering cultivation, chicken manure should be applied once every 7 days to 10 days, and the amount of top dressing should be 10 kg-15 kg/667 lb in order to maintain the pool water fertility, increase the plankton reproduction, and ensure that oysters and oysters are bred. The food supply. In sunny and warm winter weather, when the water temperature is above 6°C, appropriate amounts of bean cake, wheat, or compound feed should be fed to feed the broodstock to increase their physique and not to lose weight. Grass, broodstock broodstock should also be fed some fresh leaves, etc., to make up for lack of green material. Green broodstock ponds need to be fed with some snails, clams, and oyster meat. Daily management During the cultivation of broodstock, it should be managed by special personnel and carefully cultivated. The main duties are as follows: First, stick to the patrols once a day, morning and evening, and observe the water quality and broodstock activities. The second is the regular addition of fresh water to maintain the deepest water level to stabilize or increase the pool water temperature. The third is to start the aerator at a proper time and keep the pool of dissolved oxygen above 5 mg. The fourth is to take action when catching the broodstock, avoiding the fish's skin and scales from being injured. The injured fish cannot be cultivated as a broodstock in the coming year. Food Sweeteners,Sugar Substitutes,Zero Calorie Sugar,Food Additive Sweeteners CHANGZHOU GUANGHUI FOOD INGREDIENTS CO.,LTD , https://www.gsweetfood.com