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Fertilizer water quality. The water temperature in autumn is suitable for the growth of fish, and it can be fertilized in an appropriate amount. Generally, 500-750 kg of fermented fertilizer is applied per mu, or 1.5--2.5 kg of urea is applied, with 3- 5 kg of superphosphate. The transparency of the pool water is maintained at 25--30 cm, which ensures that there are enough food organisms in the eel and eel to accelerate the accumulation of nutrients in the fish.
Casting grass fodder. Before feeding the concentrate, fodder should be fed first to prevent grass carp species from competing for food concentrates. It is best to roundly feed a variety of grass to increase the fish's appetite.
Feed fine material. As the temperature drops, the amount of food organisms and weeds in the water is significantly reduced. At this time, concentrates should be added, such as bean cakes, cottonseed cakes, rapeseed cakes, bran, and cornmeal. Through the above measures, the overwintering species of fish can reach 2%--4% fat content and 12% protein content; they can achieve the safe wintering index from nutrition. The survival rate of overwintering can reach more than 90%.
The fish species can catch the winter
For the cultivation of fish species in the fall, the following three measures should be taken to increase the survival rate of wintering.