The benefit of temporary culture of freshwater fish in winter is high.

Fishing

Since most freshwater fish culture is released in spring and caught in winter, coupled with the desilting of fish ponds contracted by mariculturists or low-yield fish ponds, adult fish will be caught and listed on the market, and tropical fish that cannot survive the winter should also be caught and listed. Therefore, the seasonal market saturation of fish in winter often results in low prices, low fish prices and poor economic benefits, while in spring and summer, there are fewer freshwater fish on the market, resulting in uneven market supply. It has been proved by practice that temporary culture in winter can not only adjust the supply of freshwater fish in the market, but also improve the economic benefits of culture, increase production and income, which can be said to kill more than one stone. The temporary culture techniques of freshwater fish are introduced as follows:

I. selection of temporary fish culture

Temporary fish had better be unsalable in winter, best-selling in spring and summer, and overwintering species, such as silver carp, bighead carp, flat carp, grass carp, etc. can withstand low temperature, and will grow and gain weight during the temporary culture period. Its specifications are generally: silver crucian carp 100-150 grams each, silver carp, bighead carp 400 Mel 500 grams, flat fish 150 Mel 250 grams, grass carp 300 Mel 500 grams.

Second, the pond where fish are temporarily raised

The fish that do not meet the market specifications can be cultured in the ponds according to the species and specifications by using the winter idle fish ponds. Before going into the pond, clean the pond with conditions, sprinkle 150 jin of tea bran throughout the pond with 150 jin of tea bran, or sprinkle the whole pond with 250 jin of quicklime pulp per mu, not only kill wild miscellaneous fish, but also improve the water quality, after the toxicity of the fish in the water test disappears, then temporarily raise the fish in the pond; if the water quality is thin, 500 kg of fermented organic fertilizer is applied per mu to cultivate rich plankton for fish feeding and photosynthesis to make oxygen. Before temporarily raising fish into the pond, use 3% Mel 5% saline medicine bath for 20 minutes to prevent water mildew and kill parasites, and the temporary culture density is controlled at 300 Mu 600 per mu of water surface (150 Mu 200 kg).

III. Management of temporary recuperation

During the temporary cultivation period, it is necessary to strengthen management, the early water temperature is higher, appropriate to put in some high protein, fat feed, such as peanut bran, bean cake, wheat skin, etc., in order to increase the accumulation of nutrients in the fish. When the water temperature is lower than 5 ℃, the focus of management is to conserve water, increase the dissolved oxygen in the pool water, and prevent the water level from falling too much, resulting in lack of water, lack of oxygen and frostbite and death of fish; when the weather is fine and the temperature is high, 3Mel should be fed once a day. After the beginning of spring, the weather is getting warmer, that is, it enters the normal feeding and fertilization to promote its growth and weight gain. During the whole temporary cultivation period, attention should be paid to preventing diseases such as water mildew and parasitic diseases. After the Qingming Festival, one after another can be arrested and listed on the market. For example, Liu Yongguang, a fish farmer in Licheng, temporarily raised 20000 jin of fish in winter for 100 days, resulting in an output of 24000 jin (an increase of 4000 jin) and an increase of 16800 yuan.