Proper Treatment of Parasites


Proper treatment for parasites depends on which parasite the koi have. If you have access to a microscope, by simply taking a scraping from the fish and examining it under the microscope, you can usually tell exactly which parasites are present and then treat for them accordingly.

Note: When selecting a treatment to rid koi of a particular parasite, you should always try to select a treatment that will effectively kill the parasite, while at the same time, cause the least amount of stress to the koi. Stress is a real factor that needs to be considered in treating koi.

Think of it this way. You can live and work around all sorts of germs and not get sick. Then things change at work and you are suddenly required to work very long hours for several days in a row. Now, suddenly you get a cold. Why is that? It is because your immune system has becomed weakend due to the extra stress of working so much. It works the same way with koi. When they get stressed their immune system can begin to fail them and any hope for recovery will be slowed down, if in fact they recover at all.

An infestation of parasites can be very stressful to a koi. For this reason, it is very important when treating a koi with parasites to select a treatment that will not stress them anymore than is necessary.

Parasite Medication Caution Bypass Filtration?
Flukes Supaverm – For use on koi only- Kills Goldfish and several other species Not necessary




Malachite Green & Formalin – Do not use with salt level above .1% – Will kill most pond plants

– Keep pond well oxygenated

Ich Salt – Will kill most pond plants Not necessary