My family got 3 pond fish which were koi. I realized one fish was getting bigger/swollen looking.
After a few months he was getting really swollen or big and during the month he stopped eating.
I was so worried because he was the kind of fish that would come to you and let you pet it.
Today he died. I'm not sure what caused it. Recently a frog joined our pond and I'm not sure if he caused it. I would really want to know if the frog was the reason and how I could have prevented it.