In recent years, the crab disease has become increasingly serious, posing a greater threat to the crab farming industry. To control crab disease, start with prevention and start from the winter. The specific approach is: 1. Clear bottom sludge. The main components of sludge are large amounts of residual baits, organic fertilizers, dead organisms, and biological waste. Excessive silt can easily cause water quality deterioration in summer and autumn. It can also produce large amounts of organic acids, hydrogen sulfide, and ammonia, which can lower the pH of the pool water and inhibit and endanger the growth and survival of crabs, especially harmful bacteria, parasites, etc. There are silt in the pathogenic microorganisms. Once the conditions are right, all kinds of pathogens will flood. Therefore, the winter crab pool must be used to empty the pool water during the idle period, and the bottom sludge should be completely removed by mechanical or artificial means. 2. Frozen, light the bottom of the pool. After the dredging of crab ponds, clean up the gutters and pump them regularly to keep the bottom of the ponds exposed to freezing cold and sunlight for a period of time (preferably up to 1 month) to improve the soil conditions at the bottom of the pond and allow some pathogens to pass through. It was killed after freezing and sunshine, creating a good ecological environment for the growth of crabs in the coming year. 3 built into the drainage system. In addition to considering adequate water sources, the physicochemical factors of water are consistent with the growth of crabs, free from contamination, and without pathogens. They must also prevent the use of the same canal for drainage and drainage, resulting in mutual infection and re-infection. Therefore, each crab pond is required to discharge the pool water independently. The best conditions to build a reservoir, the influent by precipitation, filtration or disinfection and then introduced into the crab pool to prevent pathogens from being brought into the water. 4. Do a good job of drug disinfection. About 20 days before the stocking of crab crabs, strict disinfection with quicklime, bleaching powder, tea seed cake and other drugs was conducted. Disinfect with dry lime, with 75 to 100 kg per acre. Disinfecting with water is about 150 kg per mu. The method is to splash the calcined water into the whole pool. Bleach disinfection with 15 to 20 kilograms per acre, tea seed cake disinfection generally with water, the amount of 25 to 50 kilograms per mu, the method is to first break the tea seed cake, then soak 1 to 2 days, and then even the residue with juice Evenly splash the whole pool. Tea seed cakes are sterilized with fertilizer and promoting the growth of crabs. It is best to use tea seed cake once after disinfecting the quicklime. 5. Do a good crab disinfection. Disinfect the crabs with a suitable drug before going down the pond. Commonly used 1510-6 ~ 2010-6 concentration of potassium permanganate solution soak for 20 to 30 minutes, or 1010-6 concentration of bleach solution soak for 10 to 15 minutes. When disinfected, it can be flexibly controlled according to the size, body mass, temperature, and the safe concentration of the drug used. 6. Transplant aquatic plants. Aquatic plants can provide habitats for crabs and shells. They can also provide fresh and tasty plant feeds. They can also reduce ammonia and nitrogen levels in water, increase dissolved oxygen, and improve water quality. Whether the aquatic plants are abundant or not is extremely important for preventing crab diseases and improving the survival rate. Species of aquatic plants: submerged plants include Elodea, Vallisneria, Malay, and Zephyrium; floating plants include water peanuts, leeks, and duckweed. These plants must be sown, transplanted or transplanted in winter and spring, so that the coverage rate of crab ponds is about 60%. Tiamulin Fumarate,Tiamulin Swine,Tiamulin Chicken,Tiamulin For Animal Use Shandong Shengli Bioengineering Co., Ltd , https://www.shenglipharm.com