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  • Results 1 to 5 of 5

    Thread: Red, protruding lesion, what is it?

    1. #1
      SimonW is offline Senior Member
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      Red, protruding lesion, what is it?

      Hello friends:

      I have moved all my koi inside for over-wintering. All koi are closely inspected, and no visible lesions or other abnormality are found except one koi. Of course, if any of my koi would be sick, it would be my best koi ).

      The lesion is local, red, protruding. It is on both sides of its belly (almost symmetrical), between the belly fins and the anus. It seems to be some parasite that have embedded in the lesions, but the strange thing is that none other koi has this problem.

      Water parameters:

      Ammonia: 0,
      Nitrite: 0.1 ppm (remedied with some 0.3 % NaCl)
      Nitrate: 10-20 ppm.
      pH: 8
      KH: 6 dKH

      The only thing that can cause problem is the low temperature: It has been 3-4 centigrade for about 2 weeks now. May it be koi pox though not white?

      Now the koi are in-doors, and the temperature is 19 centigrade.

      By the way, these koi were infested with fluke, costia and chilo in June this year. They have first been treated with trichlorfon without success (I bought this medicine many years ago therefore it may had lost effectiveness) then 0.9 % NaCl for 3 months (gradually reduced to 0.4%), which seems to have killed the parasites (the koi stopped flashing completely).

      Thanks for your thoughts and advice!

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      Last edited by SimonW; 3 Days Ago at 10:37 AM.

    2. #2
      montwila's Avatar
      montwila is offline Supporting Member ~ Koi Health Care Committee Member
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      Carp Pox can become infected and might explain the color with the veining underneath. Since it is only one fish CP is the direction I would think.

      Could it be left over irritated areas from flashing?

    3. #3
      SimonW is offline Senior Member
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      Quote Originally Posted by montwila View Post
      Carp Pox can become infected and might explain the color with the veining underneath. Since it is only one fish CP is the direction I would think.

      Could it be left over irritated areas from flashing?
      Thank you for your thoughts!

      Probably not, as they never had developed any lesion when they were flashing. They were not heavily infested, as I did many scrapings on them but only found very few flukes (maybe 1 fluke per 5 scrapings) and very low number of costia and chilo (if they were costia and chilo, like max 10 tiny, barely visible moving things per scraping). The parasites were mostly found on smaller koi that had lived together with them.

      I stopped checking them since about 1 month back, as they no longer flashed.

    4. #4
      KoiRun's Avatar
      KoiRun is offline Senior Member
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      I would agree with Monte that it is likely carp pox. I also agree with your assessment that it is likely carp pox since carp pox is seasonal and is common in the fall and winter. Why it is red is also perplexing to me. I know koi heals fairly quickly in warm water. Perhaps the lesions were lighter in colour and a soon you place her in a warmer environment the immune system went into hyper mode injecting blood vessels to fight fight the invader and to develop new skin underneath. Once through with process of healing, you should see skin peeling (shedding of the dead outermost layer). I tend not to scrape off these lesions prematurely as I think it serves a protective layer while the skin underneath is healing. Carp pox tend go into latency in warmer temperatures, so I'm wondering if this koi has had a history of it in previous winters. Also, I'm saying carp pox but I think it could be a number of other viruses which behave similarly.
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    5. #5
      RichToyBox's Avatar
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      It could be viral, but it appears to me to be more bacterial. It would almost surely be bacterial if it were on one side only as fish do scrape against surfaces and the scrape will become infected with bacteria, which do cause redness and swelling, similar to a scraped knee or minor cut. To find almost the same size lesion on both sides at a similar location seems doubtful, but not impossible. In the cold water an infection will take forever to heal and may have been there for some time, and now that the fish is inside in warmer water it could go either of two ways, get better or get worse. I think I would wait and see before doing anything, but I would have on hand some antibiotics if it gets larger or redder. If it is viral, there is nothing that can be done but wait it out.

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