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Thread: Swollen Koi

  1. #1

    Swollen Koi

    Over the past of couple of days I have noticed one of my Koi have developed a swollen belly and it seems to swim around for 30 seconds then it would lie on the bottom of the tank for 10 secs and repeat this constantly. It seems to be fit to swim to the top of the tank fine and can swim as good as any of the other koi when it takes a notion to. First thought was swim bladder but I’m not so sure now. Tried to get a picture but ita doesn’t show to well. The belly seems to stick out more so bellow the fish, when looked down on you can’t really tell any difference.

    Any help would be greatly appreciated.



  2. #2
    Extreme Koi Member Rank = Kyusai TinyTony's Avatar
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    tank ? how big is this tank , how many fish and what filtration . are the scales sticking out ??

  3. #3
    The tank is 800 litres, with 8 fish and a fx6 filter, the water parameters are perfect and they get a water change every week. No the scales is fine so doesn't appear to be dropsie

  4. #4
    Extreme Koi Member Rank = Kyusai TinyTony's Avatar
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    8 fish in under 200gs what size fish ?

  5. #5
    One is 8 inch a couple 6 inch and the rest between 2-4 inch

  6. #6
    Extreme Koi Member Rank = Kyusai TinyTony's Avatar
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    really ?? im out

  7. #7
    Extreme Koi Member Rank = Supreme Champion john1's Avatar
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    We would really need a close up picture,can you not catch it up?

    Is there any heat in there,what temp?
    John

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  9. #8
    Quote Originally Posted by TinyTony View Post
    really ?? im out
    That doesn’t seem like it would be over stocked to me? Or am I wrong. Just bought the tank 2 months ago with the intention of taking the koi out and putting them into my 10000 gallon pond and then putting other variants of fish in the tank like oscars or something like that. However I don’t want to transfer the koi out into the pond now in the middle of winter. The temp in the tank is sitting at 18. I’ll try catch it later and get a good picture for you all

  10. #9
    Senior Member Rank = Rokusai JimJones's Avatar
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    hi mate

    have you tried some frozen peas. that always clears swim bladder problems with my mob. however i would advise scrapes and check it is not bacterial infection.

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  12. #10

    Swollen Koi

    Quote Originally Posted by JVTCross View Post
    That doesn’t seem like it would be over stocked to me? Or am I wrong. Just bought the tank 2 months ago with the intention of taking the koi out and putting them into my 10000 gallon pond and then putting other variants of fish in the tank like oscars or something like that. However I don’t want to transfer the koi out into the pond now in the middle of winter. The temp in the tank is sitting at 18. I’ll try catch it later and get a good picture for you all
    You’re wrong! Sorry but that’s overstocked for Koi. Sounds like a swim bladder problem, probably some infection. Have you taken levels? Ammonia. Nitrite etc ?


    Sent from my iPhone using Tapatalk
    Last edited by slapshot1; 20-02-2019 at 05:55 PM.

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  14. #11
    Quote Originally Posted by slapshot1 View Post
    You’re wrong! Sorry but that’s overstocked for Koi. Sounds like a swim bladder problem, probably some infection. Have you taken levels? Ammonia. Nitrite etc ?


    Sent from my iPhone using Tapatalk
    As Slapshot just said, we need parameter values. The often used phrase "water parameters are perfect" isn't a valid parameter reading and means different things to different people.

    The minimum volume for keeping koi healthy (even temporarily) is 15 litres per cm of fish including the tail. With approximately 35 cm of fish that equates to over 1,300 litres so you only have 60% of the volume required or that you have more than 1½ times the amount of koi biomass that the stocking capability of that tank would allow.

    You are seriously overstocked and infections are a frequent consequence of the stress caused by overstocking. Is the biofilter in the tank only two months old because a tank that you've only had for two months is unlikely to give perfect parameters even if it wasn't overstocked.

    If you give us the values of the parameters you've checked and some pictures it would help us to give good advice.

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  16. #12
    Extreme Koi Member Rank = Fry Roy V's Avatar
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    Swim bladder and a possible tumor?

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