Sorry yeah yellow my mistake. It’s just the back one that is concerning. We have had a koi carp die yesterday. It just started floating on its side, was still breathing but would not swim. It’s scales started flaking at the top of its body. We have three other Koi in the pond and we are worried what is on the goldfish could have caused the other to die. The other 3 are fine. The gold fish is now isolated from the rest.Hello and welcome.
Do you mean those yellow blobs that seem to be hanging off the fish? I don’t see anything white. Could be carp pox. If so, it’s not fatal, but there is no treatment.
Maybe better (closer, to show more detail) would help.
Bought a test kit and testing later. Around 1300 gallons, currently 3 koi carp, 2 are large probably about 18 years old 1 is slightly smaller around 10 years old. The reason for the post is there were 2 slightly smaller koi both 10 years old and one has just died. Have two quite large filters with a waterfall to bring the filtered water back in. We were worried whatever was on this gold fish, who is also in the pond but now in hospital pond, was maybe a parasite that killed the koi. But if it is fungal infection will buy treatment and treat the fish.It does look like a fungal infection on top of a wound. Do you have a test kit? Can you give us some info on your pond? Gallons, type of fish, how many and what size. What type of filtration if any do you have?
Cheers. As long as it’s not contagious so we can put it back in with the others.Sorry for delayed response. With this close up picture I too think it's some type of tumor, whether it's malignant or not, I couldn't say.....but it shouldn't be contagious to your other fish.
If it were my fish as long as it seemed to be doing well, I'd let it be. If it looks like it's suffering I'd humbly euthanize it with clove oil.
Sorry I don't have a brighter outlook.
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