When fish don't feed feed during the winter, the energy needed for life activities will not be replenished, and they can only rely on the consumption of nutrients in the body to sustain their lives. General adult fish weight will be reduced by 6%~10%, and the mortality rate will be 3%~5%. Fish species will have relatively large body surface area due to their small size. Energy loss and osmotic pressure will be higher than adult fish, and weight will be reduced by more than 10%. The mortality rate is 8%~10%; in particular, some species with thin constitutions have a mortality rate of over 40% during the wintering period. In addition, because of the long-term fasting of fish, digestive system dysfunction, metabolic function disorders, poor disease resistance, it takes a long time to restore constitution after spring, directly affect the survival rate and aquaculture production. Therefore, the adoption of the continuous feeding method of feeding in the high season and supplement feeding in the wintering season can greatly improve the survival rate of the fish and the economic benefits of the adult fish breeding. According to tests conducted by aquatic scientists and technicians, when the temperature of water in winter is above 5°C, the four major fish still feed and gain weight. Grass carp seedlings supplemented with concentrate during the winter period not only has a full body, but also maintains normal body tissue and blood physiological parameters before winter, and the average growth rate is 12% to 14%. The breeding survival rate and profit rate per unit area in the following year were 24% and 27% higher than those in the control group, respectively. Under the farming conditions in which winter carp is fed, its efficiency will be higher. For example, in aquaculture farms, 250 mu of adult fish breeding water, the main breeding of four major fish and reasonable with other good varieties, adhere to the winter to cast organic fertilizer and feed the appropriate amount of feed (peanut bran, corn flour, wheat skin and the like), adhere to the perennial vote Feeding, prolonging the growth period of fish so that the fish species with a weight of 150 grams at the end of the wintering season can be listed in most of the second year of May. This will not only increase the aquaculture production, but also shorten the breeding time, and it will be launched in the off-season and increase The sales price is 2 to 3 times higher than that of the same type of water. Due to the low water temperature in winter, the activity of fish digestive enzymes is relatively weak, so the requirements for feed quality are relatively high. Generally, it is better to feed powdered peanut bran, bean cake or compound feed, and the protein requirement content reaches 28%~30%. The amount of feeding depends on the temperature of the water. When the water temperature is above 8°C, it is fed once every 2 days to 3 days. The amount of water fed accounts for 1%~2% of the total weight of the fish. When the water temperature rises continuously above 10°C on a continuous sunny day, Increased fish activity should be appropriately increased feeding. The feed can be concentrated in the middle of the fishing pond or in the water depth. The feeding rate is based on the size of the fish pond and the density of the fish. The daily requirement is more than 2%. At the same time, the amount of organic fertilizer that has been fermented should be increased from 200 kg to 300 kg per mu, once a day for 10 days, to maintain the best water quality for the winter, and provide sufficient food organisms and photosynthesis for the wintering of fish, so that the water body can maintain High dissolved oxygen to promote fish growth and increase production and income.
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