鱼池进行药物清塘,是鱼病预防工作上的一项重要措施,时间上以在放养鱼苗前半个月左右为宜。如清塘过早,药效消失后,害鱼和病原菌又将重生;过迟,则毒性未退,影响鱼苗的放养。为完全起见,药物清塘后,最好先试养几条鱼。鱼池的清塘药物种类很多,最常用且效果较好的是生石灰和漂白粉。现将两种药物的使用方法介绍如下: Fish pond for drugs Qing Tong, fish disease prevention is an important measure on time to stocking fry about half a month or so. Such as the clear pond too early, the disappearance of efficacy, fish and pathogens will again be born again; too late, then the toxicity has not retreated, affecting stocking fry. For the sake of completeness, it is best to try out several fish after the medicine is cleared. There are many kinds of clear ponds for fish ponds. The most commonly used and better ones are quicklime and bleach. Now the use of two drugs are described below: