Hello friends:
I have had a comfortable calm time since fluke + chilo outbreak for 3 years ago.
But I still have an irritating problem that comes time to time: Localized redness.
One kind is individual scales turning red, and the redness in on the scales, not beneath the scales, with other words not skin infection. I am not so much concerned with this kind of redness, as it disappears by themselves or heals after iodine treatment. I have no good explanation to this kind of redness.
The other kind is redness for an area, and the redness is beneath the scales, with other words probably skin infections. And it usually happens on only one or two koi, not the other 25+ koi. Earlier I did scapings of these areas, and I could not see any parasites. Iodine usually remedy it. I wonder if anyone has an idea what the cause is?
It cannot be single-cellular parasites as I often do PP-treatment. The only parasite that PP does not kill readily is fluke, but I cannot find any under microscope.
Now I have one koi that has got a red area, and tomorrow I will do scaping and iodine treatment.
Thanks for your thoughts!