In the whole cycle of aquaculture, the management of the wintering period is a very important link, now more and more farmers began to choose winter fish farming, but in the process of wintering, most of the farmed fish eat low feed, reduced activity, slow metabolism, slow or even stagnant growth, resulting in fish during the wintering period of weak physique, very easy to secondary bacterial diseases and even pan pond death.
If there is a problem during the overwintering management, the fingerlings will have frostbite, infection with parasites, hypoxia, suffocation, pond and other diseases, which will seriously affect the health of the fingerlings and the later growth. Improving the health and survival rate of fingerlings after wintering is directly related to the growth rate, disease resistance and feed cost of adult fish breeding after wintering, so the quality of wintering management of fingerlings has become an important link in the production of adult fish farming.
1. Increase the water depth
The weather in the north is cold, the temperature is below zero for a long time, there is an ice phenomenon around the fish pond, at this time, if the water level is shallow, the water temperature changes greatly, the fish species are very easy to frostbite, which is not conducive to the overwintering of the fish species, so we have to deepen the water level, so that the fish can overwinter in the deep water level. For fish ponds that have been pulled by nets, the damage to the fish body caused by the nets must be disinfected.
2. Pond bottom change
For ponds that are ready to overwinter, one month before wintering, it is necessary to carry out a comprehensive bottom modification, use Qingqing to degrade the bottom of the pond residual bait and feces, ensure that toxic substances such as feed residue bait and feces in the sedimentary silt can be effectively decomposed, reduce the residue of toxic and harmful substances, and reduce the damage of toxic and harmful substances to the fish body during the wintering period.
3. Water quality regulation
When wintering, the pond water must be kept fat, lively, tender and refreshing. Water body overweight, too thin will cause pond lack of oxygen, over-fertilizer cause pond algae aging, and fish to compete for oxygen, too thin is not conducive to photosynthesis, but also will cause pond hypoxia.
4. Scientific feeding
In the north, the wintering period is as long as 5 months, during which many farmers choose not to feed the feed, the fish have to rely on their own energy to survive the long winter, in this process, the fish fall off the fat seriously, the breeding will lose a part of the fish, the loss caused is still relatively large. In fact, at noon on a sunny day in winter, proper feeding of some feed can not only ensure that the fish does not fall off, but even grow, but must use high-quality feed to reduce the burden on the digestive organs of the fish. Feed some high-quality feed before stopping the feeding, so as to provide self-consumption during the wintering period, and you can also feed the chivalrous and bile to protect the liver and gallbladder health of the fish, promote the transformation of nutrition, enhance the physique of the fish, and provide protection for spending the wintering period.
5. Prevention and control of parasites
Although the activity of parasites decreases in winter, there will still be parasite phenomena, such as wheelworms, oblique tube worms, small melon worms and so on. Therefore, in the early stage of wintering, some safety insect repellent products are used for prevention and control, and Che Jing can prevent and control a variety of parasites. Because the physique of fish will be reduced during wintering, try not to use irritating insecticide to kill insects before wintering, otherwise it will damage the fish body and cause a large number of fish to die during wintering.