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  1. #1

    Koi red scales and ulcer/sore

    Hi for a little while ive noticed my favorite koi (isnt it always) having slightly red outlines on scales. I thought it was my imagination and had always been like it , but now the situation has got worse.
    There seems to be a extensive red patch that look angry. In one scale mostly but lapping over others. Also lighter patches on the other side.
    Pond is unheated
    10000 litres
    Not stock too heavy
    Nitrates 10 and zero ammo and nitrite
    Large multibay and veggie filter (no gravel just pots)


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  2. #2
    Any advice appreciated
    Will be doing a scrape asap but im still getting used to doing these and using a scope

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  3. #3


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  5. #5
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  6. #6
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  8. #7
    Moderator Rank = Grand Champion Feline's Avatar
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    Is this fish or any others flashing?
    Your full water results would be helpful here.
    How are you dechlorinating?
    I would certainly scrape 3 or 4 fish to see what you can find.

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  10. #8
    Senior Member Rank = Yonsai RipleyRich's Avatar
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    I would topically treat also

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  12. #9
    So got my apex microscope today and proceeded to do a scrape of my sick koi

    I took 3 scrapes from gill to tail with one scrape getting a nice bit of mucus from the red area

    When i looked at the scrape at 400x i saw absolutley nothing moving at all....
    Was suprised not a thing
    Am i in the clear ? I thought is see somthing move even if it was a common creature !

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  13. #10
    Senior Member Rank = Yonsai RipleyRich's Avatar
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    My initial thought was Bacterial. If you are confident of your scrape (do another koi or two also) then I would go down the bacterial route.

    I`m a big believer in Virkon for Bacterial issues. But as I have said many times before, there will almost certainly be an underlying cause somewhere in your system. Check, double check and then check again for any possible build of of crud.

    One area people don`t think of aure gravity bottom drains. If the flow is too low you will experience laminar flow and crud will settle and collect. Its important to purge your drain regularly to flush any accumulated dirt away. Also any bypasses must be opened and flushed regularly as they are dead legs where nasties can hide!

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  15. #11
    Hi an update
    Did another final scrape
    And found a fluke
    Looks like a gill fluke?liltte fingers on one end

    Only 1 on the slide though and

    Reading on internet suggests its normal to find 1 or 2?



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  16. #12
    Senior Member Rank = Yonsai RipleyRich's Avatar
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    1 fluke in a scrape is unlikely to account for that.

    A heavy infestation resulting in serious flashing may cause that damage, but I would still be hedging towards bacterial.
    Scrape another couple and scrape in 2 or 3 areas too. Behind pecs, behind gills and on the flanks for example.

  17. #13
    Thanks for advice
    I gave a salt bath for a few minutes to see if that helps also

    Will do some more scrapes asap but havnt much time today now for more investigating

    All the other fish look ok
    Cant see any issues , the odd flash and flick here and there

    Pond very clean at moment so doubting a bacteria buildup but i wont dismiss the notion will keep my eyes out

    If it looks worse over next 2 days will have out and sedate properly plus treat area



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  18. #14
    Senior Member Rank = Grand Champion voodoo_15_uk's Avatar
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    Gill flukes have 4 distinctive dots at the end which skin flukes don't have. I would do more scrapes just to make sure. It does look bacterial issue but most likely caused by parasites.

  19. #15
    Senior Member Rank = Yonsai RipleyRich's Avatar
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    If it was me I would be on the Virkon and topically treating.

  20. #16
    Hi all sorry bit late
    This koi is fine now after removing a scale or two and giving a good clean with a koi paramedic kit I bought
    Thanks for all the help phil

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  22. #17
    Extreme Koi Member Rank = Gosai anne's Avatar
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    Glad to hear it has now recovered it's always nice to hear what the outcome was .

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