"Farming fish in the spring, and fish in the spring, three minutes in the winter." Practice has proved that the winter solstice to the beginning of the spring is the best time for the release of fish species, is conducive to early adaptability of fish species to the environment, and facilitate the overwinter management, promote the spring and long fish species, increase production. During the winter, the specific practices for stocking fish species are as follows: - Five changes in the pond: "Xiaotang" - "Datang"; "Dead pond" - "Live pond"; - "Shallow pond" - "Deep pond" - "Leak pond" "Water reservoir"; "rescue pond" to "flood pond." Renovate the pond and release the water first. After exposure, remove excess silt and only retain 15-20 cm thick silt, remove weeds, dredge the channels, and increase the pool height. Clear pond disinfectant pond water depth of 10 cm, first mu with lime 90 kg or chlorine 30% bleaching powder 4 kg, transferred into a paste uniform spill the whole pond; and then filled with water, mu bleaching 12 kg, spread evenly, fully stirred. Increase the calcium in the pool and achieve the disinfection effect. Generally, fish can be released after 7 days. Fertilizer underwater pond clear pond 5-7 days after the application of basal fertilizer. Generally, 500-700 kilograms of cow dung are fermented per mu pond, or 200 kilograms of human excrement (more can be used in Xintang or the thin pond, and less or no fertilizer can be applied in the pond), and then the winter water (wax water) can be used. Phytoplankton grows and provides natural food. The species of grass carp is 15 cm in length, 13 cm in carp, and more than 10 cm in carp and carp. Selecting the rules of the same fish species, robust physique, complete scales, non-destructive fins, stubby caudal peduncle, thick back muscles, bright color, strong anti-water, disease-free without injury, frequent beating, is conducive to improve the survival rate of fingerlings. It is the best time to release the fish species before and after the winter solstice to the Spring Festival, or when the water temperature is around 8-10°C. There is a saying in the industry that “the water is stocked in salt water and the fish is very longâ€. At this time, the water quality is stable, the fish body is strong, the fish body is not easy to be injured during fishing and transportation, and the mortality and morbidity are low. At the same time, fish species will be raised early, and they will adapt to the environment earlier and eat and grow faster as soon as possible. When stocking, it is better to choose to do it on a sunny day at noon. It is not appropriate to store in frosty and rainy days when the temperature is too low, and to prevent frostbite. Disinfect fish fingerlings into the pool. Generally, 3-5% bleaching powder and 8% copper sulfate can be used to wash the fish species for 20-30 minutes; or use 3-5% saline to dip for 5-10 minutes to achieve the effect of killing pathogenic bacteria on the body surface. Reasonable polyculture is based on the water quality of the fishery waters, bait, and species size, etc., and the reasonable stocking density and stocking amount are determined. Water and fertilizer are mainly fertilization. Combining feeding and feeding, salmon and squid should be used as the main, and the ratio of polyculture should be: 55-60% of carp, 15% of carp, 10% of grass carp, carp, carp, carp Such as 5-10%; water thin, mainly feeding, green feed, should be based on grass carp, polyculture with the proportion of: 40-50% of grass carp, carp 20%, carp 5-10%, carp 10 %, 5-10% of carp, carp, carp, etc. The stocking capacity is about 1,000 per acre. To strengthen the management of ponds, special personnel are responsible for management. Change the water every 20 days 1 time, add 15-20 centimeters of water each time, implement the first post irrigation, adjust the water quality, cool the weather, deepen the water level to more than 2 meters; ponds with low oxygenation and no oxygen for a long time, Use 5-6 kg of ammonium nitrate per acre, 3-4 kg of superphosphate, and mix it into a thin-eye cloth bag and hang it under water. Stir the bottom of the pond with bamboo rafts at noon on a sunny day and stir the other part after a period of time. Once a month. The wintering pond should be properly cast some pig manure, distiller's grains, bean cakes or cakes, etc. to increase the water temperature and meet the needs of the wintering species. When the spring water temperature reaches 7-8°C, early feeding and fertilization should be used to grow fertilizer and water to promote growth. During the overwintering season, fish species are susceptible to watery mildew, red skin disease, etc. Once the fish species are found to be infected, they must be diagnosed and treated as soon as possible. Aquatic mildew can be mixed with 4% salt and 4% baking soda to splash the whole pool, or 1 meter deep water with 10ppm bleach solution. Red skin disease is splashed once with 1ppm bleaching powder and once a day, it is splashed once with 0.5 kg of lime, and then on the fourth day, it is spilled with bleach 1ppm. Incidental helminthosis and filariasis use 0.2-0.1g of mercuric nitrate per cubic metre of water in the whole pool, or 0.25g of dried chilli powder per cubic meter of water, 0.1g of ginger, and boiling water. Sprinkle and use it twice. The fish gills were sprinkled with 0.2-0.5 ppm of 90% crystal enemy white insects.
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