Proper treatment for parasites depends on which parasite the koi have. If you have access to a microscope, by merely taking a scraping from the fish and examining it under the microscope, you can usually tell 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 choose 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. With the addition of stress, their immune system can begin to fail, and any hope for recovery will be slowed down.

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

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

Chilodinella

Trichodina

 

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

– Keep pond well oxygenated

Yes
Ich Salt – Will kill most pond plants Not necessary

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