在鱼塘周围栽植一些柳树,不仅可以绿化环境,保护堤岸,夏天给鱼遮阳,而且还可以起到防治鱼类肠炎病的作用。据调查,凡在鱼塘周围栽植较多柳树的,都没在发生肠炎病,这是因为柳絮、柳蕊和柳根都有抑制病菌的作用。现代科学证明,在柳叶和柳根内含有一定数量的碘、鞣质和水杨甙等成分,它们都具有防治疾病的作用。另外,柳絮落 Planting some willows around the fish ponds not only greens the environment, protects the embankments, summer shades of fish, but also prevents and controls fish enteritis. According to the survey, where more willow trees planted around the fish ponds, are not in the occurrence of enteritis, which is because catkins, Willow and Willow roots inhibit the role of bacteria. Modern science has shown that in willow and willow roots contain a certain amount of iodine, tannin and salicin and other ingredients, they all have the role of disease prevention. In addition, catkins fall