When breeding koi fish, what we don't want to see is that their bodies are ulcerated. First of all, we need to find out the reason, which is most likely caused by disease. In spring and autumn, the water temperature will be more suitable for some bacterial reproduction; Especially in the case of frequent water replacement, it will lead to the rapid reproduction of bacteria, which will lead to some bacterial diseases, such as "skin mildew" and so on.
For this kind of disease, considering that they may be infectious, the first step is to fish out the diseased fish, apply the corresponding medicine to their wounds, and then place them in a separate fish tank for isolation. For the original fish tank, you can first replace the water, and then take disinfection measures, and often observe whether the fish have the symptoms of morbidity, found that after the need for isolation.
For sick Koi, you can apply some medicine in their wound ulceration, such as chlortetracycline, tetracycline, etc., can treat the location of the disease. The original fish tank also needs to be disinfected to improve the water quality. The simplest is to add salt, but you need to pay attention to the amount of salt, control every 50 kilograms of water to add 1.5 kilograms of salt. Salt can not be added too much, otherwise it will also be harmful to Koi. Moreover, if you feel that the effect of salt is not good, you can choose some special drugs, such as potassium permanganate, furazolidone and so on.
