早春季节,阴雨连绵,水温较低(15℃—20℃),病菌生长繁殖旺盛,是水霉病最适流行时节。一些地方习惯早春放养鱼种,将密养于越冬池中的并塘越冬鱼出池分养,或进行鲤鱼鲫鱼等家鱼的春繁生产,均会因拉网、转运、放养等操作过程造成鱼体表受伤, Early spring, rainy and rolling, the water temperature is low (15 ℃ -20 ℃), strong growth and reproduction of bacteria, is the most appropriate season of fungal disease epidemic. In some places, it is customary to stock fish species in early spring. The winter-keeping fish that are kept in wintering ponds and tied with ponds are kept in ponds and raised for spring breeding. In addition, spring production of carps such as carp crucian carp will cause fish Surface injury,