古雪夫三代虫 (ＧｙｒｏｄａｃｔｙｌｕｓｇｕｓｓｅｖｉＬｉｎｇ)由林氏首次报道[1 ] 。近年来 ,随着南方鲇的人工养殖密度的不断提高 ,古雪夫三代虫引起的疾病愈来愈严重和普遍 ,主要危害 0 5ｋｇ及其以下的个体。其传播途径 ,疾病早期症状 ,在宿主体表的分布和药物防治已有 Gushefu three generations of insects (GyrodactylusgusseviLing) was first reported by Lin [1]. In recent years, with the continuous improvement of the artificial breeding density in the southern catfish, the diseases caused by the three generations of Gushefu are more and more serious and common, with the main hazards being those below 0 5 kg and below. The route of transmission, the early symptoms of the disease, the distribution of the body surface in the host, and the control of the drug already exist