My largest koi is developing black spots. She has had one large one next to her top fin for ages about 1cm by half a cm. I took her out to have a closer look and it just appears to be a change in skin pigment. More recently I have noticed a few more smaller black spots starting to develop near her tail end the size of a pinhead.
I have done some research and have read about shimis - a change in pigment due to chlorine and chemicals in tapwater. I always treat my water before I put it into the pond with Tetra watersafe. I can't seem to find any answers and don't know what to do to treat my fish. Please help.
Re: [ljkershaw] Should I be worried?
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even in mud pond water shimi still occurs. just have to live with it. In case you really want to get rid of it. redate the fish, use a rasor blade and scratch off the black pigment. then use iodine to treat the wound. I did once, it's easier than you thought. samantha
Re: [ljkershaw] Should I be worried?
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That is sunrise she is the 27" shank . The other is just a mutt called sunset. 7 years old and growing. notice that sunset also has black spots on her.
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Re: [ljkershaw] Should I be worried?
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I have a large platinum Koi that has also developed small black spots Its just pigment change. I think that I will keep her. What do you think? 
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