In recent years, due to the long-term high-density intensive farming and the use of high nutrient index feeds, it has led to the outbreak of liver disease in grass carp, which has caused serious economic losses. Grass carp liver disease is easily neglected by farmers and delays treatment. Now we have years of outpatient experience. Talk a few points.
First, the cause of grass carp liver disease Currently, fishermen mostly rely on the use of chemical drugs for prevention and treatment of fish diseases, and many farmers frequently indiscriminately throw drugs to cause fish liver damage: Secondly, the increase in pollutants from outside, the fishermen have been subject to different levels of pollution into the drainage In addition, the pollution caused by culture itself such as hydrogen sulfide, ammonia nitrogen, and algae toxins causes damage to the liver of fish; in addition, some farmers use high-nutrient indicators to feed grass carp to stimulate the rapid growth of fish. For example, when adults are fed with fingerling feeds and the amount of fish fed is too high, fish appear to be “fat and short†and fatty liver. Some trace elements such as vitamin E, choline, inositol, and selenium are used in the diets used by farmers. Lack of phosphorus deficiency or imbalance of calcium and phosphorus are also likely to induce liver disease.
Second, the symptoms of grass carp liver disease fish when there is no obvious symptoms, fish color, body shape did not change significantly, only loss of appetite, fluid weakness, or sometimes irritability, or even swim, severe fish body color black, color Obscure, fish body edema, obesity, Scales loose and easy to fall off, anal swelling and loss of balance, and some do not eat in the water, the reaction is sluggish and difficult to breathe, dying in the water kept flipping, dissection found liver color changes, was In purpuric, khaki, tan, etc., the gallbladder becomes larger and the bile becomes darker. The fish that suffers from this disease have poor stress-resistance. For instance, the net, transportation, water temperature, or water quality mutation will cause a large number of fish deaths.
Third, the prevention and treatment of grass carp liver disease 1, the high temperature season to do the changing of water, such as changing to less than good water quality or injection and drainage is not convenient, you can use biological agents such as photosynthetic bacteria, EM original exposed to improve water quality, Maintain good water quality. 2, the correct choice of suitable for all stages of growth of grass carp feed with full price, and when feeding to achieve two fine, middle green, fish growth season, less feed concentrate feed, more feed green feed. 3, timely prevention and correct diagnosis and treatment of fish diseases, prevention and treatment should be used under the guidance of aquatic technicians, do not increase the amount, to avoid a large number of chemical drugs on the liver damage, usually can be used to prevent and treat Chinese herbal medicine Fish disease. 4. During the aquaculture process, it is necessary to make a thorough inspection of the ground. Once abnormal conditions are found, it is necessary to correctly diagnose what causes the occurrence of such a situation and take appropriate preventive measures. 5. If you have found fish liver lesions, you should add new water in a timely manner by adding vitamins and a small amount of rare elements or herbs made baits, do not use chemical drugs, so as not to aggravate the liver damage, as a general feeding One week is a course of treatment.
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