一、水霉病1.病症水霉病是罗非鱼越冬期间的常见病。水霉菌因鱼体的损伤,鳞片脱落,从伤口处侵入并大量繁殖,形成肉眼可见的白色棉絮状菌丝,严重时病鱼游动缓慢,食欲不振或不摄食,消瘦而死。流行水温13～18℃,水温达到25℃以上时,较少发病。2.防治方法①越冬池严格消毒后放鱼,以 First, the water mold disease 1. Watermelon disease is a common disease during tilapia wintering. Water mold fungus due to fish injury, scales fall off, invaded from the wound and a large number of breeding, the formation of visible white flocculent mycelium, severe disease fish swimming slowly, loss of appetite or loss of food, weight loss and death. Popular water temperature 13 ~ 18 ℃, water temperature reaches 25 ℃ above, less incidence. 2. Prevention and control methods ① sterilized winter pool after the fish, with