Koi have lived with parasites and other pathogens since the time of their origin. Koi in a well maintained pond can live in a natural coexistence with parasites.
Remember, the goal is not to annihilate your Koi with every known medicine. A panic approach to disease control usually kills the parasites and the Koi.
When Koi scratch or act odd do not immediately dump chemicals in their home. Use the process of elimination we discuss below and treat for specific problems. Calm down and use common sense; give the Koi some time to recover from mild problems with improved water quality and filtration. Just like a dog or cat who has fleas we do not over kill the situation. Over kill can cause bigger problems down the line. Prevention is the key. Good water quality and fewer fish tend to be a more suitable approach to prevention. Take care of your water and filtration the water will take care of the Koi.
If we observe abnormal Koi behavior we must look into the possible cause. Abnormal behavior may be the result:
The Koi's symptoms are a generic reaction. The symptoms are not a conclusive indication of disease. We must first understand and alleviate the cause of the stress before we can successfully treat any disease organisms. Let's consider the process of alleviation.
We can begin by testing the pond water and environment first.
Careful consideration should be given to your filter system and your pond maintenance.
Check for chlorine.
Do not allow any runoff from your garden to enter the pond.
Have new Koi been recently added?