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How to prevent winter broodstock from falling out
Broodstock breeding is generally divided into four stages: postpartum care, autumn cultivation, winter cultivation, and spring cultivation. In the winter cultivation stage, due to low temperatures, reduced broodstock activity, and poor feeding capacity, fish diseases often occur. If poorly managed, artificial fish will be produced in the coming year. Several production processes, such as hatchery production, fry supply, and adult fish farming, have a great impact. To prevent broodstock from falling out in winter, we should focus on the following work. Reasonable provision. A reasonable stocking density is an important condition for ensuring the success of broodstock breeding. The broodstock stocking density can both fully utilize the water body and make the gonadal well developed. The ponds for raising winter broodstock should generally have enough water sources, flat bottoms, sheltered winds, and water-retentive ponds, and an area of ​​10-15 acres is appropriate. The main broodstock broodstock pond can be stocked with 10 to 15 tails of 5-8 kilograms of rearing fish per acre, with 3-5 brooded broodstock of the same specifications and 3 to 5 broodstock weighed at about 10 kilograms. The main broodstock broodstock ponds can be stocked with 10 to 15 tails of 15-20 kilograms of rearing fish per acre, and rearing 3 to 5 tails of broodstock with a tail weight of about 10 kilograms. The main pond raising grass broodstock, can be stocked with 8 to 10 kg of grass broodstock 15 per acre, with quail or broodstock 3, broodstock head bream broodstock 12 kg or so, the ratio of male to female is generally 1:1.5, minimum is not less than 1:1. Strengthen daily management. Overwinter pro-fish ponds should be managed by dedicated personnel, often touring ponds, regularly adding new water, increasing dissolved oxygen, preventing leakage, maintaining a certain water level, and raising the temperature of the entire water body. When the weather is continuously fine and the water temperature is above 6°C, appropriate amount of fine material and green leaves such as vegetables and leaves must be fed to feed the fish directly to enhance the body quality and reduce the loss of sputum. For the pond where the main carp is raised, some fermented manure should be put in regularly throughout the wintering period to increase the water temperature and fertilize the water quality. Fish disease prevention and treatment. In the cold winter season, broodstock is very prone to diseases such as watery mildew and white skin. Attention should be paid to the following matters: When catching brood fish, care should be taken to avoid the damage to the fish's skin and scales. Do not use fish with more severe mechanical damage as a broodstock for the following year. Treatment of hydromycosis can be carried out with 3-6% saline for 10 minutes, or with gallnut drowning Quanchiposa, and the amount of medication used to make the pool water into a concentration of 4ppm. Treatment of white skin disease can be bleached powder Quanchiposa, calculated as the concentration of pool water into 1ppm.