Prevention and Control Methods and Technical Key Points for Sinergasilus Infection in Chinese Fish
Prevention and Control of Sinergasilus Infection in Chinese Fish
[Pathogen] Sinergasilus sinensis; the female adult lives as a permanent parasite.
34-1 Sinergasilus sinensis
[Symptoms] In mild infections, there are generally no obvious symptoms; in severe infections, diseased fish have difficulty breathing, are restless, swim in circles or dart wildly at the water surface, and the upper lobe of the caudal fin often protrudes above the water, commonly called "tail-lifting disease," and eventually the fish become emaciated and die of suffocation. The gills of diseased fish have increased mucus, and the tips of the gill filaments are swollen and pale, with many small maggot-like parasites attached.
34-2 Diseased fish gills, showing parasitism at the tips of the gill filaments
[Epidemiology] It occurs throughout the country, mainly harming grass carp, silver carp, bighead carp, etc. over 2 years of age, and in severe cases can cause the death of diseased fish.
[Diagnosis] Preliminary diagnosis is based on symptoms and epidemiological conditions; species identification requires microscopic examination.
[Prevention and Control Methods] Carry out integrated prevention. The treatment method is to splash a mixture of crystalline trichlorfon and ferrous sulfate (5:2) or a mixture of copper sulfate and ferrous sulfate (5:2) at 0.7 ppm over the entire pond.
34-1 Sinergasilus sinensis
[Symptoms] In mild infections, there are generally no obvious symptoms; in severe infections, diseased fish have difficulty breathing, are restless, swim in circles or dart wildly at the water surface, and the upper lobe of the caudal fin often protrudes above the water, commonly called "tail-lifting disease," and eventually the fish become emaciated and die of suffocation. The gills of diseased fish have increased mucus, and the tips of the gill filaments are swollen and pale, with many small maggot-like parasites attached.
34-2 Diseased fish gills, showing parasitism at the tips of the gill filaments
[Epidemiology] It occurs throughout the country, mainly harming grass carp, silver carp, bighead carp, etc. over 2 years of age, and in severe cases can cause the death of diseased fish.
[Diagnosis] Preliminary diagnosis is based on symptoms and epidemiological conditions; species identification requires microscopic examination.
[Prevention and Control Methods] Carry out integrated prevention. The treatment method is to splash a mixture of crystalline trichlorfon and ferrous sulfate (5:2) or a mixture of copper sulfate and ferrous sulfate (5:2) at 0.7 ppm over the entire pond.