10 to 15 days before restocking disinfection ponds to drain pool water, remove excess silt, repair pool drains, mend loopholes, level the bottom of the pool, remove poolside weeds, improve water injection, drainage system, and then use quicklime, bleaching powder Disinfection treatment. Disinfection should be done on a sunny day. Dry disinfection uses 50 to 80 kg of lime per acre of ponds, and the depth of ponds is 5 to 18 cm. The lime is dissolved and evenly poured into water. The water is disinfected at a depth of 1 meter per mu and lime is used for 120 to 150 kg. Evenly, stir thoroughly.
Fertilizer fertilizer water quality clear pond 6 to 7 days after the fertilization, generally per acre fermentation of pigs, cow dung 500 to 700 kg or 200 kg of human urine.
Reasonable breeding of water and fertilizer should be based on carp and carp, and the ratio of polyculture should be: 55% to 60% of carp, 15% of carp, 10% of grass carp, 10% of carp, carp, carp, carp, etc. 5% to 10%. The skin lean and green feed should be dominated by grass carp for a long time. The proportion of mixed cultures is: 40% to 50% of grass carp, 20% of carp, 5% to 10% of carp, 10% of carp, carp, carp, carp, etc. 5 % to 10%. The stocking capacity per mu is about 1000.
Pay attention to quality should be selected bright color, robust, tight scales, active swimming, strong anti-water and the same age of the surface of the same species, consistent specifications, body length of 13 cm or more.
The stocking method should be selected during the sunny days, and the fish should be trained before the stocking. When fish species are stocked, use 3% to 4% salt water or bleaching powder, copper sulphate, trichlorfon and other chemicals to dip the fish for 5 to 15 minutes for disinfection.
Pay attention to the management of the pool of water can be properly thin fertilizer, but not too much. Maintain the depth of pool water, change the water every 20 days, and then drain first. At noon, use a bamboo raft to stir some of the bottom of the pool and stir the other part over a period of time, once a month. Regular amount of lime, bleach, etc. are put into the pool to regulate water quality. When the water temperature reaches 7°C~8°C in early spring, early feeding and fertilization should be conducted to cultivate the fertilizer and water to promote rapid growth of fish.

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