1. Suitable fish species are placed in the species-based breeding mode of grass carp. Typically 6,000 species of summer fish are planted per mu, of which grass carp accounts for 60%. The grass carp is designed for fish, eel, carp, etc. This kind of yield is generally about 300kg, (specific density should be determined depending on the bred specifications, but the yield of grass carp should be within this range). Excessive design, such as poor post-management, can cause large numbers of fish species to die. Large, low output affects economic efficiency. When summer flowers are released, care should be taken to apply quicklime to disinfect ponds before entering the pool; summer flowers should be soaked with 20ppm potassium permanganate for 20 minutes before entering the pool; the main fish should be advanced to the pond and fish rearing should be postponed. The temperature difference during stocking should be lower than 4°C to reduce the stress response when the summer flower enters the pool. Second, the daily management of grass carp fingerlings breeding is a common mode of farming, but there will be some problems in the breeding process, from the perspective of practice, prevention and treatment, to prevent the main, in the production should pay attention to daily management Good "three levels." 1, water quality regulation to keep the water "fat, live, tender, cool." Generally, 20ppm of quicklime is sprayed on the entire pool every 15-20 days to regulate water quality; in the middle and late stages of cultivation (after mid-August), microbial preparations are regularly used to degrade ammonia-nitrogen and nitrite in the water (discriminating use time of the disinfectant); The new water regulates the biological composition in the supplementary water body and promotes the circulation of the water body material. 2. Feeding the feed Guancai fish species will change their food habits after 6cm, mainly based on herbivorous food, and certain conditions should be fed with certain duckweed. Before formal feeding, train the fish species to catch food on the surface of the water. Select the branded feed produced by a professional manufacturer of fish feed, and follow the methods of “fixed, regular, quantitative, and qualitative†to feed a small amount of meals. The feed protein is high in the early stage and can be about 22% in the later stage. Generally, the feeding amount in the early June to July and mid-October to November should be relatively increased. In the medium term, the amount of feed should be controlled so that the previous stage of feeding can be improved. The survival rate will be promoted in the later period, so that “grasping the two ends and protecting the middle†will be avoided. Blindly pursuing the previous specifications will lead to the later onset. 3. The disease incidence during the cultivation of grass carp species is high, and disease prevention is the key. In addition to regular use of disinfectants, internal medicines need to be added during the peak of onset. Medication should pay attention to avoid frequent use of drugs, avoid not symptomatic remedy. Grass carp fingerlings are prone to outbreaks, hemorrhage, and hepatobiliary syndrome in the later period. They must be carefully diagnosed and the disease should be prescribed. These three diseases are easy to be complicated and difficult to cure once they occur. According to the rule of incidence, add internal medicine during the onset season to prevent it. For rotten deer, enrofloxacin fish, Corning, and water body disinfection should be administered internally, and mild quaternary ammonium iodine is generally recommended. Do not use strong irritating disinfectants. Insect pests should be killed first, insecticides must not be used without insects, resulting in deterioration of water quality, destruction of phytoplankton in water, and the formation of a vicious circle of water. Hemorrhagic disease should be better with orally taken orally. Hepatobiliary syndrome should increase hepatoprotective drugs, supplemented with stress Ning and Vc, VE to enhance the body's anti-stress ability, and improve the ability to resist disease. Grass carp fingerlings should follow the ecological characteristics of this fish, and management, scientific and reasonable increase or decrease the amount of feed, will certainly achieve high yields.
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