多年来,许多养殖单位把越冬期死鱼的原因统归为缺氧,在管理上以增氧措施为主,忽视鱼病的流行和防治。而造成越冬期死鱼的原因有许多是鱼病流行所致。如1984、1985两年黑龙江省巴彦县西集鱼场、肇源县茂兴湖鱼场几次流行四极虫病,共死亡鱼种35000千克;1985年春吉林省谢家店水库因鲤斜管虫病流行造成13000千克鱼种死亡, Over the years, many aquaculture units cite the causes of dead fish during the winter as hypoxia, focusing on the management of aerobic measures and ignoring the prevalence and prevention of fish diseases. Many causes of dead fish during wintering are due to the prevalence of fish diseases. Such as 1984,1985 two years in Bayan County, Heilongjiang Province fish farm, Maoxing Lake Zhaoyuan County several times the prevalence of quadratus disease, a total of 35,000 kilograms of dead fish species; 1985 Spring Jilin Province Xiejiadian reservoir due to Lei Phytophthora epidemic caused 13,000 kilograms of fish deaths,