Fish species winter stocking considerations
"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 to put fingerlings, is conducive to early adaptability of fish species to the environment, and facilitate winter management, and promote the spring and long fish species, increase production. Method and procedure 1, pay attention to clear pond disinfection. Pond water depth of 10 cm, the first mu 90 kg with quicklime or chlorine bleach 30% bleach 4 kg, transferred into a paste evenly spilled the whole pond; then filled with water, mu bleaching 12 kg, spread evenly, fully stirred. Usually fish can be released after 7 days. 2, pay attention to fertilizer underwater pond. Clear base 5 to 7 days after the base fertilizer. Fermented pigs, 500-700 kilograms of cow dung or 200 kilograms of human excrement per hectare of ponds (generally applied to Xintang or Qiantang ponds, and then injected with water, favoring the growth of phytoplankton and providing natural food 3, pay attention to appropriate specifications. Grass, squid, and squid are 15 cm in length, 13 cm in squid, and more than 10 cm in squid and squid. The choice of fingerlings should be consistent with the rules and robust, which will help improve the survival rate of fingerlings. 4, pay attention to early release. From the winter solstice to the Spring Festival, or when the water temperature is around 8 to 10°C, it is the best time for stocking fish species. The industry has the saying that "water from wax water is stocked and the species of fish is very long." 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 have a frosty day and a rainy day when the temperature is too low, and to prevent frostbite. 5, pay attention to the disinfection of fingerlings. Fish species should be sterilized into the pool. Generally, 3% to 5% bleaching powder and 8% copper sulfate are used to wash the fish species for 20 to 30 minutes; or 3% to 5% salt water is used for 5 to 10 minutes to kill pathogenic bacteria on body surfaces. 6, pay attention to reasonable polyculture. Determine the reasonable stocking density and stocking rate based on the water quality of the fish farms, bait, and species size. Water and fertilizer are mainly fertilized, and in combination with feeding, salmon and squid should be the main species, and the ratio of polyculture should be: 55% to 60% of carp, 15% of carp, 10% of grass carp, carp, carp, carp Fish, such as 5% to 10%; water thin, mainly feeding, green feed, should be based on grass carp, polyculture with a ratio of: grass carp 40% to 50%, carp 20%, carp 5% to 10 %, carp 10%, carp, carp, carp, etc. 5% to 10%. The stocking capacity is about 1,000 per acre. 7, pay attention to strengthen management. The pond must have someone responsible for management. Change the water once every 20 days, each time adding 15-20 centimeters of water, implementing the first post irrigation, adjusting the water quality, and the weather is quenching, deepen the water level to more than 2 meters; ponds with low oxygenation and no oxygenation for a long time, Use 5~6 kg of ammonium nitrate per mu and 3 to 4 kg of superphosphate. Mix and put it in 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 while. 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 water temperature reaches 7～8°C in the spring, fertilizer should be fed early, fertilizer and water should be cultivated to promote growth. 8, pay attention to prevention and treatment of fish disease. Fish species are susceptible to watery mildew and red skin diseases during wintering. 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. The fish gills were sprinkled with 90% of the crystal enemy white bugs 0.2 to 0.5 ppm. Precautions In winter, the temperature is relatively low and the management of aquaculture environment is difficult. Now it is recommended to prevent shallow water. The wintering pond is shallow, the water temperature changes rapidly, and the temperature difference is large, which is unfavorable for fish growth. After the water level drops, the fish population density increases accordingly, and it is easy to cause lack of oxygen and stop the fish from growing or even die. Therefore, winter ponds should maintain normal water levels. Under normal conditions, hypoxic pans occur mostly in the summer and autumn high temperature seasons and rarely in winter. However, in the Feishui Fish Pond, Shentan Deadwater Fishpond, and cage culture conditions, dead fishes with hypoxia can also occur in the winter. In the above waters, as the temperature decreases, the temperature of the surface water drops, the density increases, and it sinks. Underlying anoxic and anaerobic floating will cause serious oxygen deficiency in the upper water. In addition, the short photoperiod in winter, the photosynthesis of the phytoplankton in the water is weakened, and the oxygen production is reduced, which may also result in insufficient oxygen in the aquaculture water. Therefore, oxygenation measures should be taken timely in these waters to prevent flooding. Plantain Herb,Whole Grass,Mentha Haplocalyx,Herba Pteridis Multifidae Henan Qiancuntang medicial technology co.ltd. , https://www.qctchineseherb.com