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一、绪言小瓜虫是一种身体比较大,肉眼能见的原生动物,寄生在各种淡水鱼的上皮组织和鳃丝组织中,剥取寄主的上皮细胞和红血球为生。同时,由于它在组织中不停的活动和钻营的结果,上皮组织引起病态的浮肿,形成白色突出的小点,故有“白点”病之称。这种病,目前在我国淡水养鱼事业中已成为主要的危险病害之一。它的爆发流行,往往使成千成万的鱼种在几天之内死亡;用作春季产卵孵化的亲鲤,由于它的侵袭,以致不能完成鲤鱼苗的生产计划。金鱼和热带鱼的饲养者对小瓜虫的威胁体会更深,多年很费
I. Introduction Small melon is a larger body, the naked eye can see protozoa, parasitic in a variety of freshwater fish epithelial tissue and gill filaments, stripping the host epithelial cells and red blood cells living. At the same time, epithelial tissue elicits morbid edema due to the non-stop activities in the organization and the result of drilling. It forms a white highlight and therefore is called “white spot” disease. This disease has now become one of the major dangerous diseases in the cause of freshwater fish farming in our country. Its outbreak has tended to kill tens of thousands of fish species in a matter of days; the pro-carp, used as a spawning hatchery in spring, has been unable to complete its plan of carp production because of its invasion. Feeders for goldfish and tropical fish have a deeper, millennia-old toll on baby melons