At present, many fish farming households generally use the traditional breeding method of “spring fishing in winter†to raise fish. Practice has proved that the best way is to “winter winter fishing,†that is, to put fingerlings before and after the “winter solstice†in the first year, and to market it in the winter of the second year. "The spring fish release the fish and the winter fish is three minutes long." Practice has proved that the best time to put fingerlings is the winter solstice and the beginning of spring, which will help fish species adapt to the environment as soon as possible, facilitate wintering management, and promote the springing of fish species. Long, increase production. There are eight precautions for stocking winter fish:
1. Pay attention to clear pond disinfection. The pond is 10 cm deep. Firstly, every 667 square meters (1 mu) of lime 90 kg or chlorine 30% bleaching powder 4 kg shall be transferred into a paste to uniformly sprinkling the whole pond; then the pool shall be filled with bleaching powder every 667 square meters. Twelve kilograms were spread evenly and fully stirred. Usually fish species can be released after 7 days.
2. Pay attention to fertilizer ponds. Clear base 5 to 7 days after the base fertilizer. Generally, every 667 square meters of ponds are fermented by pigs, 500-700 kilograms of cow dung, or 200 kilograms of human excrements (more than one can be used in Xintang or Qiantang). Water injection is then beneficial to the growth of phytoplankton and provides natural food.
3. Note the appropriate specifications. The length of the fish species to be put, grass, cockroach and eel should be 15 cm, eel 13 cm, mackerel and eel more than 10 cm. The selection of fish species should be consistent in specifications and robust in health, which will help improve the survival rate of fish species.
4. Pay attention to early release. From the winter solstice to the Spring Festival, or when the water temperature is 8 to 10°C, it is the best time to stock fish species. At this time, the water quality is stable and the fish body is strong. During the fishing and transportation, the fish body is not easy to be injured, 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, eat as early as possible, and increase their weight quickly. When stocking, it is better to choose to do it at noon on sunny days. It is not appropriate for frost days and rain and snow days when the temperature is too low to prevent the fish from freezing.
5. Pay attention to the disinfection of fingerlings. Fish species should enter the pool after disinfection. 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 the fish body surface.
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. In combination with feeding, salmon and squid should be used as the main products; water should be lean and mainly used for feeding, and green fodder should be used, and grass carp should be the main product. The stocking capacity is about 1,000 per 667 square meters.
7. Pay attention to strengthening 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, For every 667 square meters, use 5~6kg of ammonium nitrate and 3~4kg of superphosphate, mix and put it in a cloth bag with fine eyes and hang it under water. Stir the bottom of the pond with bamboo rafts at noon on a sunny day, stir the other part after some time. , once a month. Overwinter ponds should be suitable to put some pig manure, distiller's grains, bean cakes or cakes, etc., in order to increase the water temperature and meet the needs of wintering fish species for a small amount of food. When spring water temperature reaches 7～8°C, early feeding and fertilization should be used to grow fertilizer and water to promote fish growth.
8. Take care to prevent fish diseases. Fish species are susceptible to watery mildew and red skin diseases during wintering. Aquatic mildew can be splashed with 4% salt and 4% baking soda, or every 667 square meters, with a water depth of 1 meter, and sprinkled with 10 mg/kg bleach. The first day with red skin disease with 1 mg / kg bleaching Quanchiposa once, the second day with lime 0.5 kg spilled once, the first day and then bleaching powder 1 mg / kg spilled again. Incidental helminthosis and filariasis use 0.1 to 0.2g of mercury per cubic meter of water and the entire pool is sprinkled with water, or 0.25g of dry chili powder per cubic meter of water, 0.1g of ginger, and decoction of juice. Sprinkle the pool and use it twice. The fish gills were sprayed with 90% crystals of trichlorfon 0.2-0.5 mg/kg.
Food And Beverage Additive is a nonnutritional substance that is added consciously, generally in small amounts, to food to improve its appearance, flavor, structure, or storage properties.According to this definition, food fortifiers with the purpose of enhancing the nutritional content of food should not be included in the scope of food additives.Food additives have the following three characteristics: one is to add to the food of the material, therefore, it is generally not eaten alone as food;Second, it includes both synthetic substances and natural substances.Third, it is added to the food for the purpose of improving the quality of food and color, aroma, taste and for the need of anti-corrosion, preservation and processing technology.
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