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What are the prevention and control methods for fish gyrodactyliasis?

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Pathogen and prevalence The pathogens of fish gyrodactyliasis are Gyrodactylus medius, Gyrodactylus bacterialis, and Gyrodactylus elegans. This disease is mainly prevalent in spring and from late autumn to early winter, and excessive stocking density in ponds is the main cause of fish outbreaks. Symptoms Sick fish have a layer of grayish-white mucus on the skin and are thin and weak. In the early stage of the disease, they are extremely restless, sometimes swimming wildly, sometimes swimming sharply on their side. They rub against water grasses or the edges of tanks, trying to get rid of the infestation of the pathogens. Subsequently, appetite decreases, swimming becomes slow, and eventually they die. Prevention and control methods 1. When

Pathogen and prevalence The pathogens of fish gyrodactyliasis are Gyrodactylus medius, Gyrodactylus bacterialis, and Gyrodactylus elegans. This disease is mainly prevalent in spring and from late autumn to early winter, and excessive stocking density in ponds is the main cause of fish outbreaks.

Symptoms Sick fish have a layer of grayish-white mucus on the skin and are thin and weak. In the early stage of the disease, they are extremely restless, sometimes swimming wildly, sometimes swimming sharply on their side. They rub against water grasses or the edges of tanks, trying to get rid of the infestation of the pathogens. Subsequently, appetite decreases, swimming becomes slow, and eventually they die.

Prevention and control methods 1. When the water temperature is 20°C to 30°C, use 90% crystal trichlorfon at a concentration of 0.2×10-6 to 0.3×10-6 and splash it over the whole pond. 2. Soak in a 20×10-6 potassium permanganate solution for 15 minutes. 3. For freshwater fish, soak in 5% salt water for 5 minutes; 4. Soak the fish body in 200×10-6 to 250×10-6 formalin for 25 minutes or 50×10-6 for 14 hours.

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