Practice has proved that the best time to release fish species is from the winter solstice to the beginning of spring, which is conducive to adapting the fish species to the environment as soon as possible, and promoting the spring and long growth of the fish species and increasing the yield. During the winter season, stocking well-stocked fish species, we must grasp the following "nine customs."
The first pass: The fish pond is changed five times. Xiaotang was changed to become a big pond, a dead pond was changed to a living pond, a shallow pond was changed to a deep pond, a leaking pond was changed to a water reservoir, and a rescue pond was changed to a flood control pond. After the renovation ponds were first exposed to water, the excessive silt was removed and only 15-20 cm thick silt was retained. The weeds were removed, the channels were cleared, and the pool height was increased.
The second pass: Disinfect the clear pond. The pond is left with water 10 centimeters deep, with 90 kg of lime per acre or 4 kg of bleach containing 30% chlorine, transferred into a paste and evenly spilled through the pond. Then fill the pool with 12 kg of bleach per acre and spread evenly. Stir thoroughly.
The third level: fertilizer underwater pond. Clear base 5 to 7 days after the base fertilizer. Generally, 500-700 kg of fermented pigs or cow dung per acre pond, 200 kg of human excrement, and more can be used in Xintang and Qiantang ponds. The fertilizer ponds can be applied less or not, and then the winter water is used to promote the growth of phytoplankton. Provide natural food for fingerlings.
Fourth Pass: Grasp the specifications of stocking fish species. Grass, squid, and squid are 15 cm in length, 13 cm in squid, and more than 10 cm in squid and squid. Fish species require the same specifications, robust physique, and no disease or injury.
The fifth pass: pay close attention to early release. The winter solstice to the Spring Festival, or the water temperature of 8 °C ~ 10 °C is the best time to release fish species. The fish species should be selected to be carried out at noon on sunny days, and the frost and rainy species with too low temperature should not be used to prevent fish from freezing.
The sixth pass: To disinfect fish species. Fish species should be sterilized into the pool. Generally available 3% ~ 5% bleach or 8% copper sulfate solution, dip fish species for 20 to 30 minutes, or with 3% ~ 5% saline wash for 5 ~ 10 minutes, in order to achieve the role of killing the body surface bacteria .
The seventh pass: rational polyculture. According to the fishery water quality, bait, fish size, etc., to determine a reasonable stocking density and polyculture fish species. Fertilizer tanks mainly use fertilization, combined with feeding, the main carp carp, carp, polyculture with a ratio of 60% carp, carp 15%, grass carp 10%, carp, carp, carp and other 15%. The fish ponds with relatively thin water quality are mainly fed with bait. If there are many green fodder, the proportion of mixed grass carp is mainly: 50% of grass carp, 20% of carp, 10% of carp, 10% of carp, carp, carp , squid and other 10%. The stocking capacity is about 1,000 per acre.
The eighth pass: strengthen management. The pond must have someone responsible for management. Change the water once every 20 days, change the water every time 15 to 20 cm, after the implementation of the first irrigation, adjust the water quality. The weather is very cold and it is necessary to deepen the water level to more than 2 meters. For ponds with no water supply and low oxygen content for a long time, use 5-6 kg of ammonium nitrate per mu, and 3-4 kg of phosphate fertilizer, and mix them in a thin-eyed cloth bag and hung under water. Stir the bottom of the pond on a sunny day at noon. After a while, stir another part once a day. The wintering pond should be properly cast some pig manure, distiller's grains, bean cakes or cakes, etc., in order to raise the water temperature and meet the demand for a small amount of wintering fish. When the spring water temperature reaches 7°C～8°C, fertilization and fertilization should be started early to encourage the fish species to grow quickly.
The ninth point: prevention and treatment of fish diseases. Fish species are susceptible to watery mildew, red skin disease, etc. during the winter, and once fish species are found to be treated early. Aquatic mildew can be splashed with a mixture of 4% saline and 4% baking soda. Red skin disease is flooded once per cubic meter of water with 1 gram of bleached water in the whole pool, and once every 3 days. For larval tuberculosis and filariasis, use 0.25 g of dried chili powder and 0.1 g of Ginger per cubic metre of water. Add water to the broth for frying. Quanchiposa is used twice. The fish gills are sputtered with 90% crystal trichlorfon 0.2-0.5 g of water per cubic meter of water.
The first pass: The fish pond is changed five times. Xiaotang was changed to become a big pond, a dead pond was changed to a living pond, a shallow pond was changed to a deep pond, a leaking pond was changed to a water reservoir, and a rescue pond was changed to a flood control pond. After the renovation ponds were first exposed to water, the excessive silt was removed and only 15-20 cm thick silt was retained. The weeds were removed, the channels were cleared, and the pool height was increased.
The second pass: Disinfect the clear pond. The pond is left with water 10 centimeters deep, with 90 kg of lime per acre or 4 kg of bleach containing 30% chlorine, transferred into a paste and evenly spilled through the pond. Then fill the pool with 12 kg of bleach per acre and spread evenly. Stir thoroughly.
The third level: fertilizer underwater pond. Clear base 5 to 7 days after the base fertilizer. Generally, 500-700 kg of fermented pigs or cow dung per acre pond, 200 kg of human excrement, and more can be used in Xintang and Qiantang ponds. The fertilizer ponds can be applied less or not, and then the winter water is used to promote the growth of phytoplankton. Provide natural food for fingerlings.
Fourth Pass: Grasp the specifications of stocking fish species. Grass, squid, and squid are 15 cm in length, 13 cm in squid, and more than 10 cm in squid and squid. Fish species require the same specifications, robust physique, and no disease or injury.
The fifth pass: pay close attention to early release. The winter solstice to the Spring Festival, or the water temperature of 8 °C ~ 10 °C is the best time to release fish species. The fish species should be selected to be carried out at noon on sunny days, and the frost and rainy species with too low temperature should not be used to prevent fish from freezing.
The sixth pass: To disinfect fish species. Fish species should be sterilized into the pool. Generally available 3% ~ 5% bleach or 8% copper sulfate solution, dip fish species for 20 to 30 minutes, or with 3% ~ 5% saline wash for 5 ~ 10 minutes, in order to achieve the role of killing the body surface bacteria .
The seventh pass: rational polyculture. According to the fishery water quality, bait, fish size, etc., to determine a reasonable stocking density and polyculture fish species. Fertilizer tanks mainly use fertilization, combined with feeding, the main carp carp, carp, polyculture with a ratio of 60% carp, carp 15%, grass carp 10%, carp, carp, carp and other 15%. The fish ponds with relatively thin water quality are mainly fed with bait. If there are many green fodder, the proportion of mixed grass carp is mainly: 50% of grass carp, 20% of carp, 10% of carp, 10% of carp, carp, carp , squid and other 10%. The stocking capacity is about 1,000 per acre.
The eighth pass: strengthen management. The pond must have someone responsible for management. Change the water once every 20 days, change the water every time 15 to 20 cm, after the implementation of the first irrigation, adjust the water quality. The weather is very cold and it is necessary to deepen the water level to more than 2 meters. For ponds with no water supply and low oxygen content for a long time, use 5-6 kg of ammonium nitrate per mu, and 3-4 kg of phosphate fertilizer, and mix them in a thin-eyed cloth bag and hung under water. Stir the bottom of the pond on a sunny day at noon. After a while, stir another part once a day. The wintering pond should be properly cast some pig manure, distiller's grains, bean cakes or cakes, etc., in order to raise the water temperature and meet the demand for a small amount of wintering fish. When the spring water temperature reaches 7°C～8°C, fertilization and fertilization should be started early to encourage the fish species to grow quickly.
The ninth point: prevention and treatment of fish diseases. Fish species are susceptible to watery mildew, red skin disease, etc. during the winter, and once fish species are found to be treated early. Aquatic mildew can be splashed with a mixture of 4% saline and 4% baking soda. Red skin disease is flooded once per cubic meter of water with 1 gram of bleached water in the whole pool, and once every 3 days. For larval tuberculosis and filariasis, use 0.25 g of dried chili powder and 0.1 g of Ginger per cubic metre of water. Add water to the broth for frying. Quanchiposa is used twice. The fish gills are sputtered with 90% crystal trichlorfon 0.2-0.5 g of water per cubic meter of water.
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