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  1. #1

    Very large blisters near Koi tail

    All,

    I have recently purchased a house with a quite large established pond and 4 koi. One of the Koi has a number of infections on its tail - they may be fungal, but I cannot really find any images of anything that looks like it (see image). The other 3 koi are fine. I feel very sorry for this fish - its eating fine, but obviously, it is impeding its swimming and it just looks awful. Can anyone advise what it may be and how I can treat it please?

    fish.jpg

    thanks in advance,

    Ant



  2. #2
    Senior Member Rank = Grand Champion RoyLittle0's Avatar
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    People would need to see a good picture first before hazarding a guess, the blister/ulcer could be caused by an unseen parasite, the blister/ulcer may not be the route cause of the problem, the fish may have damaged itself due to parasites or it could be a water quality issue, have you done a water quality test, that would be the first thing I would clear up.

    Do you have a net and clean bucket that you can catch the fish and transfer it into the bucket to take a better picture

    We really need to ascertain the problem or at least eliminate certain things before treating
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  3. #3
    Hi Roy,

    thanks for getting back to me so quickly. I've had a couple of goes at catching the fish, but its a wide and deep pond, and so far its managed to evade me. I will follow your advice and do a water quality test and update this thread.

    thanks again - I really appreciate your help,

    Ant

  4. #4

  5. #5
    Extreme Koi Member Rank = Mature Champion pip895's Avatar
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    I wouldn't claim to be an expert but I would say that looks like a tumor - if it is, there is not much you can do. If the fish is still eating and happy then you could just leave it otherwise you will need to euthanise the fish. A high dose of clove oil - which is used as a sedative at low doses is about the most humane way.
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  7. #6
    Hi Pip,

    thanks for getting back to me. My feeling is also that it looks like a tumour. Recently it has started to get bigger, but the fish is eating fine and does not seem in distress, though the weight of the tumour impacts the way it swims. I think I will leave it - I am reluctant to euthanize the fish - and hope that it doesn't get significantly worse.

    thanks for your advice - I really appreciate it.

    Ant

 

 

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