Grass carp has become one of the main species of freshwater culture in recent years because of its easy feeding, herbivorous nature, rapid growth and high population yield. Cultivating large-scale grass carp species is the key to improving grass carp breeding efficiency. Pond clearing The area of ​​fish breeding ponds should not be too large, generally 5 acres to 8 acres is appropriate, water depth 1.5 meters to 2.0 meters. Fish breeding ponds require sediment sediments, flat bottoms, and well shaped pools, preferably rectangular in the east-west direction; good water retention, adequate water supply, fresh water quality, convenient drainage and drainage, no sources of pollution, and drainage channels. About 15 days before stocking, fish ponds should be dredged to make the silt thickness less than 15 cm. The water should be added to the depth of 10 cm after 5 days. 100 kg of lime should be used for cleaning and disinfection per acre. White and white water, leaving no corners, then stirring the bottom of the pool one more time the next day to completely kill the bacteria and pests in the sludge. About 0.7 to 1.0 meters of water is added to the pool 7 days to 10 days before the fish is released. When flooding, prevent wild fish and harmful organisms from entering the pond. Apply 200 kg to 250 kg of fermented organic fertilizer per acre. The water quality is well cultivated, so that the summer fishes are rich in natural food organisms after they are planted in the pool. Fish species stocking To cultivate large-scale grass fingerlings, quality grass carp summer flowers must be selected for stocking. Summer flower requirements: robust, uniform specifications, scales intact, disease-free, injury-free, lively, strong ability to back up water. The summer flowers that are stocked in the same pond should be the same source of fish, once put enough to avoid mixed species, uneven specifications and affect the growth of the species. Stocking specifications: Stocking fish summer flowers about 4 cm in stocking size, stocking 10,000 to 12,000 tails per acre. After 20 days of stocking summer grass carp, it is generally possible to stock 1,500 summer fish per mu and 500 summer carp summer flowers. All fish species need to be sterilized with 3% to 5% salt water for 5 minutes to 8 minutes before stocking. The temperature difference between the temperature of the fish when stocking the fish should not exceed 3°C to reduce the stress response of the species into the pool. Feeding Cultivating large-scale grass carp fingerlings and feeding the bait is the key to ensure that the grass carp grows rapidly during the effective growth period to achieve the large-scale grass carp species required for production. Fodder feeds should adopt special full-price pelleted feeds, fixed and fixed pond management. Feeding of bait must follow the "four principles" of fixed-point, regular, quantitative, and qualitative. (1) Fixed point: Xiahua has just entered the pool stage and can feed fermented soybean cakes, cakes, etc., and the initial stage of feeding is the use of Mantang spreading method. After 10 days to 15 days, it is converted into microgranules with a protein content of 35%. Perform domestication and gradually transition to fixed-point feeding. After successful domestication, the fish should be fed in a fixed position. Generally, 2 to 5 acres of ponds should be designed as a food field. The food field should be selected on the bank of Xiangyang. At the same time, according to the growth status of the fish species, the particle size of the pellet feed can be timely adjusted to ensure that the fish species can feed and eat. In the breeding process, a certain amount of green feed, such as small green linden and tender grass, is needed to reduce the occurrence of hepatobiliary diseases due to the rapid growth of grass carp species. (2) Timing: Feeding time should be fixed. Usually twice a day, that is, 9 a.m. to 10 a.m. and 14 a.m. to 15 p.m. Grass carp grows well (July to September) and can be fed once more. (3) Quantitative: The daily feeding amount of bait is generally 1% to 10% of the body weight of the pond, and the feeding should be adjusted according to the weather, water temperature, fish species activity and feed intake. Under normal circumstances, it is appropriate to gradually reduce the amount of fish that is fed to the food field each time. Before the weather is hot or thunderstorms, be sure to postpone or stop feeding. (4) Qualitative: The feed must be fresh and cannot be fed with decayed and deteriorated feed. After the fed feed has been successfully domesticated, do not arbitrarily modify the formulation or diet composition. Water quality regulation During the cultivation of the whole fish species, it requires fresh water, rich dissolved oxygen, long-term maintenance of water quality, livelihood, and coolness, so that the species can live in high quality water bodies to accelerate the growth of the species. (1) Scientific note and water change. After stocking summer flowers, water is injected once a week, each time about 10 centimeters of water is injected to accelerate the growth and reproduction of plankton. In mid-July, the water level can reach 1.5 meters. After changing the water, change the water once every 10 days, drain about 20 centimeters each time, and then fill the water with 30 centimeters. Water must be drained first, then to the middle of August. The pond level stays at 2 meters. From August to September when the water temperature is high, change the water every 4 days to 5 days, about 30 centimeters each time. Change the water once every 15 days to 20 days after the fall, 10 cm to 20 cm each time. (2) Rational fertilization. According to the water quality, fertilizer is applied once every 20 days, and fertilization is generally performed after changing the water. When the transparency of the pool water is more than 30 cm, it is necessary to apply fertilizer in time. The fertilizer is mainly fermented and decomposed organic fertilizer or biological fishery fertilizer. According to the transparency of the water body, it is based on the principle of less application of diligence. (3) Apply quicklime. Quicklime plays an important role in improving the water quality of the water. Generally, it is used once every 20 days to 30 days, and 15kg of lime is used per acre. Lime is fresh and lumpy. (4) Increase oxygen at a proper time. Each 1.5-meter aerator should be equipped with a 1.5-kilogram aerator. Since the start of July, the oxygen will be turned on for 1 hour to 2 hours every day at noon. After August, it will be turned on for 2 hours every day to ensure that the water is not deficient in oxygen and rainy days. When the air pressure is low, oxygen should be turned on at any time to meet the demand of dissolved oxygen for fish. (5) Use microbial preparations. Use microbial preparations such as photosynthetic bacteria or EM bacteria to improve the water quality and sediment quality of the ponds so that the microecology of the water bodies is in a benign cycle and eliminate harmful substances in the water bodies. Microbial preparations should be used at intervals (10 days) with bactericidal drugs such as quicklime to improve their effectiveness. Science prevention Grass carp species are prone to disease during cultivation and must adhere to the principle of prevention and prevention. (1) Select high-quality seed. The seed requires strong physique, uniform specifications, no disease or injury, so that scientific feeding can be done to improve the disease resistance of grass carp. (2) Vaccine soaking. Vaccination is one of the effective ways to prevent grass carp diseases. Before the fish species are transported in plastic bags, they are placed in plastic bags and then put into the fish species. The soaking process can be completed in a few hours, and the fish fry can be put into the cultivation pond for cultivation. (3) Strengthen disinfection. Disinfect the food courts and tools on a regular basis, at least once a week, to eliminate germs breeding opportunities. The water in the pond should be spilled once a month with chlorine dioxide and other disinfectants to prevent the breeding and reproduction of harmful bacteria and create a good ecological environment for the growth of grass carp species. (4) Pay attention to insecticide. At the beginning of July, pesticides can be applied once to the water body. Generally, drugs that are less irritating to fish species can be used to prevent more parasites from accumulating and causing infection to the fish body. At the end of August and early September, the pond water body will be further treated once. Insecticides reduce the risk of infection caused by fall parasites on fingerlings. (5) symptomatic medication. Grass carp fingerling stage, gill disease, enteritis disease, erythroderma, etc., can be used to extrude rhubarb leachate, chlorine dioxide and other drugs for disinfection; oral fish rehabilitation type A drug bait for treatment, generally 5 days ~ It can be cured within 7 days; when parasites occur, it is advisable to kill the insects first and then sterilize them to prevent the fish species from causing bacterial infections due to parasites and avoid secondary diseases of the fingerlings. Try to use biological fish medicine and biological products to prevent and treat diseases, and promote the use of Chinese herbal medicine. The regular patrol pond species cultivation pool must adhere to the early, middle and evening trips, and periodically remove the residual bait debris from the pond. If any problems are found, it should be dealt with promptly. In case of abnormal weather, the number of patrol ponds should be appropriately increased. For the stocking, feeding, water injection, medication, etc., do a detailed record. Generally after 5 months to 6 months of breeding, the per mu can produce 750 kg to 800 kg of fish, of which 350 g to 450 g of grass carp species range from 500 kg to 600 kg. Frozen Sardine,Frozen Sardines Sardinefrozen,Frozen Sardine Fish,Sardine Whole Round Frozen Zhoushan City Shuangying Aquatic Products Co., Ltd.  , https://www.shuangying-aquatic.com