Fishes having Fish lice usually show this symptom of 'Disk like parasite attached to body and fins'
Carefully read though the article to find out whether your Koi is having Fish lice.
Fish lice are disk shaped parasites between 8 and 12mm in diameter and varying the color from green to brown.
They can be seen attached to body and fins.
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Koi sufferring from Fish lice
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Apply salt solution
Prepare a salt solution mixing salt in water (not in aquarium). And then apply on fish with a paint brush.
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