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车轮由属于原生动物，个体甚少，由于形似车轮而得名。它主要寄生在海、淡水中鱼类的体表、鳃丝、鳃耙及鼻孔内，特别在人工养殖的光琳白娼、鳗、草、鲢、端等苗种阶段为甚。该类寄生虫的流行地区广，遍及全国各他，流行盛期每年4至11月。鱼类感染此病时因破坏鳃丝等表皮组织，
Wheels belong to the protozoa, very few individuals, due to the shape of the wheel named. It is mainly parasitic in the sea, freshwater fish in the surface, gill wire, gill rakers and nostrils, especially in artificially breeding Guanglin prostitutes, eels, grass, silver carp and other seed stage is very. The prevalence of such parasites in a wide area, throughout the country, the prevalence of its peak from April to November each year. Fish infected with the disease due to the destruction of gill filaments and other epidermal tissue,