Broodstock Winter Breeding Techniques

Broodstock breeding is divided into postpartum care, autumn cultivation, winter cultivation and spring cultivation. Because of low winter temperatures, broodstock activities are reduced, feeding capacity is weak, and fish diseases are prone to occur; if poorly managed, it will have a great impact on the production of artificial hatching, fish seed production, and adult fish farming in the coming year. The main technical points for cultivating broodstock in winter are:
1. The selection of pro-fish ponds in ponds requires sufficient water sources, flat bottoms, sheltered winds, and water-retaining insulation, and an area of ​​10-15 acres is appropriate.
Second, reasonable stocking broodstock stocking density to both fully use the water body, but also to make it a good degree of gonad development, reasonable stocking density is an important condition to ensure the success of broodstock cultivation. The requirements for different varieties are:
The main broodstock broodstock pond is reared with 10-15 tails of 5-8 kg of fish per acre, and 3-5 tails of broodstock with the same specifications and 3-5 tails of broodstock with a tail weight of approximately 10 kg. The main broodstock pond is reared with 10-15 tails of 15-20 kilograms of rearing fish per acre, with 3-5 tail broodstock weighing approximately 10 kilograms. The main pond raising grass broodstock, stocked with 8 to 10 kg of broodstock per mu, 15 broodstock, broodstock or broodstock with 3 fish, head bream broodstock about 12 kg. The ratio of male to female is generally 1:1.5, and the minimum is not less than 1:1.
Third, the daily management of the pro-fish pond needs special personnel to be responsible for and carefully manage it. Do a regular patrol pond, regularly add new water to increase dissolved oxygen, prevent leakage, maintain a certain water level, in order to increase the temperature of the water body. When continuous fine and water temperature is above 6°C, appropriate amount of fine material and green material should be fed to feed the fish directly to enhance the physical quality and reduce the loss of lice. For the pond where the main eel is raised, some fermented manure should be put in periodically throughout the wintering period to increase the water temperature and improve the water quality.
Fourth, the prevention and treatment of fish diseases Winter broodstock is prone to get watery mildew, white skin and other fish diseases, should pay attention to the action when catching broodstock to be brisk, to avoid damaging the fish's skin, scales; do not take the heavier mechanical damage of fish, as the broodstock in the coming year use. Treatment of hydromycosis can be done with 10-20ppm Weikang dip, or with Wei Kang 0.15-0.3ppm Quanchiposa.
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