How to improve fish farming efficiency in winter

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 maintained the fullness of the fish body, the body tissues and the main physiological indicators of the blood can maintain the normal level before the winter, and the average growth rate of 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, an aquaculture farm with 250 mu of adult fish breeding water, mainly breeding four large populations and well-matched and excellent varieties, persisting in the application of organic fertilizer and appropriate amount of feed (peanut bran, corn flour, wheat husk, etc.) in the winter, and insisting on annual investment. Feeding, prolonging the growth period of fish so that the fish species with a weight of 150 grams at the end of wintering season can be listed on the vast majority by the second year of May. The benefits are two to three times higher than those of the same type.

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 feeding amount depends on the temperature of the water. When the water temperature is above 8°C, it is fed once every two to three days. The feeding amount 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, the fish Increased activity should increase the amount of feeding. The feed can be concentrated into the middle or depth of the fish pond, and at the same time, the amount of fermented organic fertilizer should be 200-300 kilograms, once for 10 days.

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