春夏季节,水温适宜,水中各种病源体容易滋生繁殖,是鱼类的发病季节。尤其是草鱼发病死亡率高,损失大,如果忽视预防很容易诱发鱼病。广大养鱼户应树立无病先防,防重于治的思想,及时做好预防工作。现将四种主要鱼病的症状及防治方法分别介绍如下: Spring and summer seasons, water temperature suitable, easy to breed a variety of water sources in the body, is the season of fish incidence. In particular, the incidence of grass carp high mortality, loss, neglect of prevention is very easy to induce fish disease. The majority of fish farmers should establish a disease-free first, prevention-based thinking, timely preventive work. Now the symptoms of four major fish diseases and prevention methods are described below: