2. Feeds fed do not meet the nutritional needs of grass carp fingerlings. First of all, the feed formulation of grass carp fingerlings is unreasonable. At present, the cultivation of grass carp fingerlings in the western part of Henan Province mainly draws on the intensified farming techniques of carp ponds, and most farmers directly use the carp formula feed to feed grass carp or slightly modify them. Studies have shown that the demand for major nutrients such as proteins, fats, and carbohydrates in grass carp fingerlings and carp fingerlings is quite different. Carp fingerlings require a feed protein content of 32% to 35% and a fat content of 4% to 15%. %, carbohydrate content of 30% to 40%, and grass carp species require feed protein content of 25% to 30%, fat content of 3% to 8%, carbohydrate content of up to 40%. In general, the demand for protein, fat, etc. during the growth of first-year grass carp fingerlings is lower than that of carp fingerlings, and the utilization rate of carbohydrates is higher. During the whole breeding period of grass carp, the feeding of high-protein carp feeds all the time leads to the occurrence of fish nutritional diseases (such as fatty liver, liver degeneration, etc.). Secondly, the vitamin content in the feed is insufficient. The first-year grass carp is affected by factors such as density, environmental conditions, and growth rate during intensive aquaculture. The demand for vitamins is significantly increased. Diseases, such as insufficient choline chloride in feed, can easily cause fatty liver disease in grass carp fingerlings. In particular, water-soluble vitamins such as vitamin C cannot be stored in the body and need to be continuously supplied from the feed. Only common squid premixes are added to the feed, and the vitamin content is obviously insufficient.
3. Feed feeding is not scientific. Many farmers mistakenly believe that the greater the amount of feed pelleted, the better, and ignore the grass carp's own habits and its incidence, the result is often the early growth of grass carp growth, but in the feeding period of grass carp, 8 From January to September, fish disease outbreaks occur during the high incidence of fish diseases. As the incidence of disease is fiercer, é‚‘ is mostly a complication. It is difficult to control the disease with drugs in a short period of time and the mortality rate is high.
4. The disease prevention measures are unreasonable. Some fish farmers have poor awareness of disease prevention and are often fed with grass carp fingerlings that feed well and grow faster, and neglect normal fish disease prevention work. It is too late to take measures once the illness occurs. Some farmers rely too much on the role of drugs and ignore the fundamental role of improving the water ecological environment and the scientific use of drugs. In the breeding process, fear of the onset of grass carp, almost every day in the use of different drugs, especially some of the oral antibiotics have reached the point of abuse. The excessive use of drugs not only leads to strong drug resistance of pathogens, but also causes serious damage to the internal organs (such as liver, kidney, spleen, etc.) of grass carp fingerlings, which greatly reduces the ability of grass carp to digest, detoxify and fight disease. Unscientific use of medicines not only wastes a lot of manpower, material resources, and financial resources, it is more likely to lead to disease, and often results in less efforts.
Dongguan City Risen Medical Products Co., Ltd. , https://www.risenppe.com