In winter, it is a good time for conventional aquaculture products such as fingerlings and crabs and shrimps to be put on. However, if they are handled improperly in winter, these aquatic products can easily infect shrimps and affect the healthy growth of aquatic products. The occurrence of saprophytic disease is mainly due to an urgent secondary infection. The fish are injured due to crowding, movement, or other adverse environmental factors. The aquatic spores of the aquatic mycosis are opportunistically attached to the necrotic tissue. Began to germinate to form hyphae, hyphae in addition to parasitic necrotic tissue, can still extend into the vicinity of normal tissue, secretion of digestive enzymes decomposition of the surrounding tissue, and then penetrate the dermis deep muscle, skin and muscle necrosis, often leading to aquatic product wounds The necrotic tissue cells, loss of appetite, and ultimately cause a large number of deaths. The prevention and control methods are now described as follows: 1. Thoroughly clear the pond. Remove excess silt, and use 20kg/mu ~ 30kg/mu of lime or hydrococcus net 0.3g/m3 ~ 0.5g/m3 or 200ml/mu with sterile water solution Quanchiposa. 2. Reasonably control the stocking density of seedlings, especially aquatic animals with hard spines and hard thorns. 3. When the nets are transported and stocked with fish, the operation should be meticulous, and the fish should not be injured. It is better to soak for 15 minutes to 20 minutes with water and mildew net 50 grams per square to avoid the occurrence of watery mildew and fungus mildew. 4. Strengthen feeding and management, improve seedlings' own immunity and resistance. Every 10 kilograms of aquatic animals use vitamin E 0.3g ~ 0.6g, feed 2 times a day, and feed 3 days. 5. Prevent low temperature cold wave. Deepen the water level in the breeding pond, increase the temperature of the insulation material, or warm it over the winter, depending on the breed. 6. The broodstock is injured. It can be applied with 10% hydromycin plus Vaseline to make ointment. It has the functions of killing fungi, astringing and healing wounds. Utility Knife,Abs Utility Knife,Aluminium Utility Knife,Plastic Grip Utility Knife Shangqiu City Huashang Zhiyuan Tools Co., Ltd. , https://www.hszytools.com