Mouth fungus

[Ronfire]

I have 3 fish with mouth fungus in a 2400 gallon pond plus bog.The one apears to now have large white areas mayme 1/4" -3/16 " on the body.
Hard to get a picture but I will try. There are no good pond shops around this area that carry Pimafix or Knockout.
What is the best course treatment for this issue?
Will try to get and post some pictures.

 

[Tula]

I'm sorry to hear about your fish, darn

If these were my fish I'd research fungal infections on koi from some reputable sites. Here are a few sites I'd read. Hope this helps.

Koivet.com | Fish Health | Dr. Erik Johnson – Fish Medicines Symptoms and Treatments

koivet.com

https://www.koiphen.com/forums/ ( they have a section on illness )
https://www.youtube.com/channel/UCJLoSfDy187XKu0Lml-oepg