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Thread: Koi flashing

  1. #1

    Koi flashing

    Hi all, advice needed.

    I'm new to koi keeping. One of them is flashing a lot, a few others are flashing less often. It looks like they are trying to scratch an itch!

    Any ideas what could be causing it?

    All help welcome thanks



  2. #2
    Senior Member Rank = Kyusai RS2OOO's Avatar
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    Could be a number of potential causes.

    What are your water parameters like? Particularly Ammonia, Nitrite and PH?

    Fish will flash when the ammonia is elevated and that isn't uncommon at this time of year because the filters take a while to catch up as the weather warms.

    What is your pond capacity and stocking level?

    If you are not over stocked and the water parameters are all perfect it is then a case of ruling out each possible cause and once everything is ruled out it is then likely to be caused by a parasite. A number of different parasites can cause flashing, but each parasite requires a different medication so you'd need to then identify which parasite your fish are infected with.

  3. #3
    Quote Originally Posted by RS2OOO View Post
    Could be a number of potential causes.

    What are your water parameters like? Particularly Ammonia, Nitrite and PH?

    Fish will flash when the ammonia is elevated and that isn't uncommon at this time of year because the filters take a while to catch up as the weather warms.

    What is your pond capacity and stocking level?

    If you are not over stocked and the water parameters are all perfect it is then a case of ruling out each possible cause and once everything is ruled out it is then likely to be caused by a parasite. A number of different parasites can cause flashing, but each parasite requires a different medication so you'd need to then identify which parasite your fish are infected with.
    Thanks for the quick reply.

    Pond is 750gallons
    3x 16inch koi
    9 x 8inch koi

    Ammonia 0.5
    Nitrite 0
    Nitrate 100
    Gh 500
    KH 180
    PH7.6

    Filter has been going over winter
    I've just added the 3 biggest koi

  4. #4
    ammonias up some isnt it, id start trickling water in and out, to dilute it out.
    youve just added the 3 biggest fish so the load on the bio filter has increased massively, you will probs have to monitor your water closely for the next few months.
    What filters are you using, tbh thats a lot of fish for 750 gallons.
    Theres a fair chance, if you didnt already have parasites that the new ones brought some with them, they usually do.

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  6. #5
    Senior Member Rank = Kyusai RS2OOO's Avatar
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    My 10 koi were in a temporary 550 gallon pool for a week and they flashed like crazy when ammonia went up to 0.5 but my PH at 8.2 is higher than yours and ammonia isn't quite so toxic at lower PH, therefore I honestly don't know whether your ammonia is causing the flashing or whether its parasites, or a mixture of both.

    Nonetheless, the ammonia needs bringing down to zero anyway, because if you need to treat for parasites its best to have perfect water first so as not to risk causing more problems, therefore take the advice above if possible and trickle fresh water in (make sure you add a suitable dechlorinator).

    Which leads us to the potential for parasites. The only real way to identify which parasite you might have is to scrape mucus from the fish and put under a microscope.

    There is no other way - advice from local fish places usually ends with people buying a whole load of the wrong medication and killing their fish.

    Familyman is right about the overstocking. I've just increased my pond from 1500 gallons to 2600 gallons as it became obvious 1500 gallons wasn't enough for 10 Koi. Things can go wrong horribly fast when overstocked.
    Last edited by RS2OOO; 11-04-2019 at 07:19 PM.

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  8. #6
    Extreme Koi Member Rank = Grand Champion john1's Avatar
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    As above with Rs,you need to dilute the ammonia out,cut the food out or very little and see how it goes from there.
    John

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  10. #7
    Quote Originally Posted by john1 View Post
    As above with Rs,you need to dilute the ammonia out,cut the food out or very little and see how it goes from there.
    Thanks for all the advice. Just done a 15% water change, will test regularly and cut down food.

    Also just in the process of adding an anoxic filter - massive debate about to start? :-)

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  12. #8
    Ok so the ammonia has dropped following more water changes, but the koi are still flashing.

    Is there anyone in the Reading/Berkshire area that can help with a microscope?

 

 

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