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  1. #1

    Platinum ogon black spot

    Hi guys new to this forum, and after some advise. I have a platinum ogon that has recently had a black mark come up on heís head! Nitrate/nitrate and ph all ok and amonia running at 0.2 (just to give you my water readings more info the better!) Iv done abit of research and black spot is a possibility but Iím no expert only been into the hobby for 6 months! I will post up some pictures tomorrow. But seems odd to me as platinums should be all white so itís ringing alarms for me to investigate further! I did notice few weeks back that he had a black mark on heís peck fin also but didnít really fink to much if Iím honest as he still seems to be swimming fine and eating but this one on head concerns me! Also heís only a baby at about 5 inches. I post photos tomo and look forward for responses. Thanks



  2. #2
    Here are the pictures of the black spot/markings ... scraped him this morning found nothing along with two other fish any ideas what this could be... see head and peck fin IMG_8707.JPG


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  4. #3
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    I'm a newbie but, is it a "shimmy" as the Koi is growing its a natural change. I have 1 small Koi who was completely orange then a spot appeared on his side spread to 4 scales and then it stopped he has now developed a couple of spots on the other side and some on his fins. they haven't changed in over a month and water parameters are good and is always first, and follows me around the pond, for feeding. Or can it be a natural colour change

    Some experts may be along soon.
    When Iím dead I hope my Mrs doesnít sell my fishing gear for what I told her they cost!

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  6. #4
    Yeah I thought it could either be a shimey or black spot (which has something to do with flukes) Iv been reading a book regards koi and read about shimmies il attach photo as it may help you decide on your fish. But I do think my black mark looks different to the attached picture from the book. Thing is itís hard to know unless you are experienced I guess fingers crossed someone can advise. Thanks for the reply IMG_8715.JPGIMG_8714.JPG


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  8. #5

    Platinum ogon black spot

    Quote Originally Posted by charco123 View Post
    Here are the pictures of the black spot/markings ... scraped him this morning found nothing along with two other fish any ideas what this could be... see head and peck fin IMG_8707.JPG


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    The spot on the fin is hint that you may not have a platinum. Koi color changes as they grow but generally black on the fin means black on the body. Black (Sumi) can take years to come out. Some of the best Shiro Utsuri are white for years then black rises up. This looks to be a domestic koi. They can be very volatile where color is concerned. This is the one of the main reason quality Japanese koi cost so much. They have spent decades perfecting color stability. A lot of domestic breeders care only about color when they are young for the quick sale. At 5 inches you really have no idea what you will end up with. Most experts I know say at 3 years you can probably know what you have.


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    Last edited by slapshot1; 11-10-2019 at 12:43 AM.

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