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About Saprolegniasis
Nov 19, 2018

As the weather turns cold, it is also in the high season of saprolegniasis, especially when the water temperature is 8 °C ~ 18 °C. Saprolegniasis is also called dermatomycosis. The pathogen is mainly mold, which is parasitic on the wounds and fish eggs of fish. It is a common fish disease.
The occurrence of saprolegniasis is mainly caused by the secondary infection caused by the urgency. The fish is injured due to crowding, movement or other adverse environmental factors. The saprolegniasis of the water spores is waiting for the necrotic tissue to germination. Forming mycelium, in addition to parasitic necrotic tissue, hyphae can also invade normal tissues in the vicinity, secrete digestive enzymes to break down the surrounding tissues, and penetrate the dermis deep into the muscles, causing skin and muscle necrosis to disintegrate.
     The mycelium of the surface layer extends outward to form a cotton-like covering, and forms a sporangium at the end, releasing the spores into the water and spreading them through the water.
When the fish has just contracted the disease, it does not show any symptoms. Once the fish body is found to have "white hair", the hyphae have invaded the fish body wound and spread into the gap of the muscle tissue. As the disease progresses, the affected muscles rot, the appetite diminishes, and eventually die. This disease can occur throughout the year. In order to prevent the occurrence of saprolegniasis, in addition to attention should be taken to prevent damage to the fish body and bite by the parasite when fishing, it should be disinfected in time to inhibit the occurrence of saprolegniasis. Water quality regulation is the most important thing in controlling saprolegniasis.
     There are several characteristics of saprolegniasis disease, as long as you pay attention to prevention, you can achieve good prevention and treatment.
1. There are always fungi in the water, but it needs to accumulate to a certain amount, which will lead to disease, maintain a good water quality, enhance the resistance of the fish, and avoid the disease. The temperature is low, and the bottom is changed regularly (potassium persulfate composite salt tablets, ozone, etc.) to change the bottom, and the clear water can effectively prevent the occurrence of saprolegniasis.
2. Fish will not suffer from saprolegniasis if it is not injured. Because the fish body has the protection of mucus and scales, it is difficult for saprolegniasis to invade. Therefore, whether it is daily management or fishing, it must be handled carefully. It is best not to cause fish injury. Prevention method. Of course, the wounds invaded by parasites are also easy to open channels for the invasion of saprolegniasis. Pay attention to the prevention and control of parasites can effectively prevent secondary infection of saprolegniasis. After trawling and insecticide, it should be disinfected in time (Povidone iodine, Jingbojin iodine, and bacteria toxic) to promote rapid wound healing.
3. The pathogen of saprolegniasis is a fungus rather than a bacterium. Therefore, when selecting a control drug, attention should be paid to the use of a drug that has a killing inhibitory effect on fungi rather than a commonly used bactericidal drug. The main commonly used in aquatic products is povidone. Iodine, glutaraldehyde, salicylic acid, thioether grated, etc., although malachite green has special effects, it is strictly prohibited to use except for ornamental fish.  


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