I have a pond with two koi, 5-6 minnow, and around 20 goldfish including comet, oranda, ryukin, black moor, and shubunkin. I keep it at around 1100 ppm salt concentration. Water tests are excellent, chemically speaking. Water temp is around 60 F lately. This outdoor pond does have outdoor debris so it's not perfectly clear water. The fish stay in it all year round and experience its full temperature range (in MN).
One oranda has had light-orange/white mildly raised spots on its wen for around a month. Upon googling it, I mostly found threads that suggested this is just normal wen growth so I didn't take any action - just kept an eye on it.
I just noticed a large white square spot on its body in addition to the spotting on the wen. It looks like a large single piece of square kosher salt. So naturally, one thinks: ich.
However, no other fish in the pond have any white spots at all, anywhere. I've never had an ich scare before, so I wanted to ask: how likely is this to be ich if no one else has it? Since I have so many fancy fish, including three other oranda, you'd think that at least one other fish would be showing spots of some kind.
The fish in question is not acting sick at all. No fish have been added into the pond in over two years, so I'm not sure where ich could have come from if it is ich.
Thanks for any feedback!
ETA: it is mating season in this pond, so could it be damage on a female from being aggressively pursued? Some of my black moors have mating stars right now so I suppose it could be something like that as well, though I'd never heard of that in orandas on this part of the body.
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