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  • Results 1 to 9 of 9

    Thread: What are the red spots on one koi´s belly?

    1. #1
      SimonW is offline Senior Member
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      What are the red spots on one koi´s belly?

      Hello friends:

      I have kept 30+ small koi in the same over-wintering tank, and they have been together for more than 6 months.

      Three days ago I emptied the tank. I looked carefully at everyone of them, and all were healthy without any visible abnormality, except this one, a tancho gomoro. On its belly there are a lot of red spots. They feel smooth, not protruding, and it seems to be no lesion or ulcer either.

      I observed this kind of red spots on the same koi´s belly already for 2-3 months ago, and I succeeded in getting rid of them by topical iodine treatment. But now they re-appeared.

      I guess that it is not infectious, as none of the other 30+ koi have got this kind of red spots despite that they have lived in the same tank for 6+ months.

      I wonder if anyone has an idea on what they are? May it be koi´s equivalent to human´s acne??

      Thank you for your thoughts!

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      Last edited by SimonW; 06-25-2021 at 04:44 PM.

    2. #2
      RichToyBox's Avatar
      RichToyBox is offline Administrator
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      I don't know what the cause is, but I would treat it with iodine again to insure that it is not likely to progress into larger bacterial ulcers.


      Zone 7 A/B
      Keep your words sweet. You never know when you may have to eat them.
      Richard

    3. #3
      SimonW is offline Senior Member
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      Hello friends:

      The red spots almost disappeared. But now the koi´s body bends like a boat. It happened to another koi earlier, but I don´t see any correlation between these 2 koi. I wonder what this is? Thanks!

      Viewed from above its body is symmetrical - No side-ward bending.

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    4. #4
      kdh is offline Senior Member
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      Looks like both fish had spots on belly? I can see some on the last pic?

    5. #5
      SimonW is offline Senior Member
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      Quote Originally Posted by kdh View Post
      Looks like both fish had spots on belly? I can see some on the last pic?
      It is the same koi.

      Yes the red spots are still visible, but reduced quite a bit. Richard recommended me to do the iodine treatment again, but I have been too busy to take care of it. So it has been healing by itself.

      Now its body has bent. I have another koi whose body also has bent vertically like this. Both of them behave normally. I can only think of high nitrate as a possible cause. Is it known that high nitrate will do this to fish?

    6. #6
      kdh is offline Senior Member
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      Quote Originally Posted by SimonW View Post
      It is the same koi.

      Yes the red spots are still visible, but reduced quite a bit. Richard recommended me to do the iodine treatment again, but I have been too busy to take care of it. So it has been healing by itself.

      Now its body has bent. I have another koi whose body also has bent vertically like this. Both of them behave normally. I can only think of high nitrate as a possible cause. Is it known that high nitrate will do this to fish?
      Never read anything in regards to nitrate causing spinal issues

      Did you notice any red spots on the other koi that have the same bent back issue?

    7. #7
      SimonW is offline Senior Member
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      Quote Originally Posted by kdh View Post
      Never read anything in regards to nitrate causing spinal issues

      Did you notice any red spots on the other koi that have the same bent back issue?
      No red spots on any other koi. That makes me think that these red spots are koi´s equivalent to human´s acne or something like that.

    8. #8
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      Was the bend in the back something that happened over time or almost instantly. Broken back usually shows as a sideways kink in the back, not exactly what I see in this picture, but if it happened quickly, then electrical shock could be the cause. Electrical shock can be from electrical equipment in the pond losing its insulating properties or from lightning strikes.

      I have never heard of nitrates causing a spinal deformity, but some fish have birth defects of bent spines, usually euthanized before they can come to market.


      Zone 7 A/B
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      Richard

    9. #9
      SimonW is offline Senior Member
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      Quote Originally Posted by RichToyBox View Post
      Was the bend in the back something that happened over time or almost instantly. Broken back usually shows as a sideways kink in the back, not exactly what I see in this picture, but if it happened quickly, then electrical shock could be the cause. Electrical shock can be from electrical equipment in the pond losing its insulating properties or from lightning strikes.

      I have never heard of nitrates causing a spinal deformity, but some fish have birth defects of bent spines, usually euthanized before they can come to market.
      Thank you Richard!

      I don´t know how fast it happened. I have submerged pump so it is likely. I will use another pump.

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