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  1. #1

    Koi dying help!!

    image.jpg

    Hi over the last few days koi in my pond have been dying! I have tested the water and all has come back fine!

    The fish that have died all seem to have discolouration to their body's.

    This is is a photo of my carp (still alive) who also is showing signs of discolouration.

    image.jpg
    This is a photo of one of the dead koi (also had discolouration near the gills)

    any help or advice gratefully recieved
    thanks in advance
    Siobhan



  2. #2
    Moderator Rank = Supreme Champion Feline's Avatar
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    That's bad news

    We are going to need a lot more info about your pond and setup to offer help here.

    Could you start by posting the latest water test results?
    What area are you in?
    How many fish have you actually lost and how many remain?

  3. #3
    Again more info but are the fish sat on the bottom of the pond floor this could cause discolouration and even soars.


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  4. #4
    Just looking at your photos again on the second pic are the koi,s eyes sunken in??


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  5. #5
    Hi, just waiting for my partner to let me know the set up as I all do is feed them haha!


    Nitrate 0ppm
    Nitrite 0ppm
    Ammonia 0ppm
    Ph 8.4


    5 koi have died (max 5 inches)


    14 ( 2 approx 7 inches and the rest no bigger that 5 inches)


    I'm in Norfolk (tap water ph 7.6)




    DaveG the second photo was taken when I found that koi dead, so in that photo he could of been dead 12 hours, sorry it was a morbid photo but thought maybe someone could see something wrong with it etc)
    The eyes could possibly have been sunken I hadn't looked too closely.


    Thank you all for taking your time to help :-)

  6. #6
    Extreme Koi Member Rank = Nisai nugster's Avatar
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    have you bought / added any new koi recently?

  7. #7
    Ok it was hard to see on that photo. I hope it's not KHV as temps have been rising. It's prob not and I'm completely wrong I hope.


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    Moderator Rank = Supreme Champion Feline's Avatar
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    We can rule out pH crash from your water results anyway.
    Your other results are a bit odd- you wouldn't really have zero nitrate if your filters are working and keeping the ammonia and nitrite at zero, What test kit are you using? Is it in date?

    A high mortality rate like you are seeing that can't be attributed to water quality is likely to be caused by one of the these:

    • a nasty parasite infestation (costia, chilo, white spot)
    • KHV
    • contamination with something toxic


    Where do you buy your fish from? Are any new this summer?

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  10. #9
    No new fish, we have indoor fish so I'm quite used to seeing white spot (ich) but cannot see anything at all visible other than the slightly different colour scales.


    oh no I hope not I will have a Google KHV and keep an eye out for symptoms!

    It's just a liquid test kit from the local fish shop. The make is API, I only bought it just over a month ago. perhaps I read the colour wrong? There is very little between each of the colours. I'll retest in the morning and post a photo and maybe you could check for me?


    The ones that have died mainly came from the same person, a local breeder, I did wonder if it could be genetic. But the carp( in the top photo) came from a local fish shop and it also has the strange scales.

    we have had a lot of green weed in the pond (which I pull out every time I see any) someone had said perhaps it is oxygen levels? We have just ordered an extra pump and I am going to try that! Can't hurt can it!

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  12. #10
    Extreme Koi Member Rank = Grand Champion lee63's Avatar
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    The api kit is a good one in my opinion, think i know why your nitrate is showing 0 too. It doesnt state on the full kit instructions but if you buy the nitrate one seperate it gives better instruction. You need to shake up both the test bottles for at least a miniute. Then once 10 drops of each is added to the 5ml sample shake with lid on for another 1 min at least then wait 10 mins for complete colour change, im pretty sure you will see a colour change doing it that way.
    I really hope its not khv for you also.
    Out of curiosity what size is your pond and what filtration etc.. Is running? Do you have any extra air on?


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    Extreme Koi Member Rank = Grand Champion lee63's Avatar
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    Oh and the carp in the photo is a mirror carp, its scales are meant to be like that so no worry there.


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    Extreme Koi Member Rank = Supreme Champion pondwithnoname's Avatar
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    Hi Smccarthy, your fish are all small so can we assume your pond is fairly new and when was the last fish introduced?
    The gang on extreme are going to need a bucketful of information to help you so the more in depth information you can provide the better.
    Alias PWNN - Steve
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  16. #13
    The gills on all the dead fish didn't look like the ones of those with KHV so fingers crossed. They also had no leisons or anything.


    Its only a small pond, around 5000 litres I think, running a kockney koi 8000 bay filter, a 110w uv. The air pump says 60l/min, we have two 5 inch flat round air stones.


    the new pond was built beginning February mature filter was transferred. We bought some baby koi in April time from a local breeder.
    Attached Images Attached Images

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    Extreme Koi Member Rank = Supreme Champion pondwithnoname's Avatar
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    Quote Originally Posted by Smccarthy View Post
    The gills on all the dead fish didn't look like the ones of those with KHV so fingers crossed. They also had no leisons or anything.


    Its only a small pond, around 5000 litres I think, running a kockney koi 8000 bay filter, a 110w uv. The air pump says 60l/min, we have two 5 inch flat round air stones.


    the new pond was built beginning February mature filter was transferred. We bought some baby koi in April time from a local breeder.
    I'm thinking new pond syndrome and don't believe the water readings are accurate, on top of this you may have a parasite problem but the water chemistry is the first port of call, what say others?
    Alias PWNN - Steve
    My favourite and recommended web site is......
    http://www.mankysanke.co.uk/
    http://www.freewebs.com/koikoi/

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    Extreme Koi Member Rank = Grand Champion lee63's Avatar
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    Its very likely that it is a classic case of nps. With 0 ammonia, 0 nitrite and nitrate that could suggest nothings happening in the nitrogen cycle but i would expect to see ammonia if your feeding? I may be wrong here but the fish in the picture looks like a baby mirror carp which is a wild strain of carp, its possible that where these came from is a mass producer of angling fish for lakes etc.. Which could have brought some nasties in?


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  21. #16
    I have just built my new pond due to moving last November. It's been running 2 months now running nexus and eazy pod on my skimmer line. Both filters are as new as all media I have dried out when I moved. I started by feeding very little ever other day monitoring my water params 3 times a week after 2 weeks I had 0.25 on api ammonia test never above. Now I can feed twice a day and 0 ammonia. But I do keep checking and if in doubt will stop feeding. All throughout my nitrite has been 0on api. I will say tho I'm now 3700gallons and only have 8 fish in there but all decent size.
    If that pond was built in Feb surely filter would have started to mature


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  23. #17
    Extreme Koi Member Rank = Nisai nugster's Avatar
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    K1 can take a while to mature according to popular concencus. But if you dried out your old K1 I would expect it to go a lot quicker. Can you post a photo of the pond? Is there any chance a childs toy wih a battery in it could be lurking in the water? Are you able to do or get someone to check your fish for parasites?

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  25. #18
    Extreme Koi Member Rank = Supreme Champion pondwithnoname's Avatar
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    Even though mature media has been exchanged I'd suggest it's a drop in the ocean as far as the real bacteria needs are concerned, a pond and it's filter can take couple of years to establish itself to achieve the ponds chemistry balance.
    My gut feeling is NPS.
    Alias PWNN - Steve
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  27. #19
    Ah okay thank you guys for your help. Is it worth putting in any bacteria balls etc?

    Yes I am feeding them one- two times a day but obviously only a small ammount as they are small!

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  29. #20
    Extreme Koi Member Rank = Adult Champion GHOSTDOG's Avatar
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    Have you checked there's no chlorine when you top up your water?
    I've had a few problems
    Have a read of my help thread
    Help!!! What's this?

    https://r.tapatalk.com/shareLink?url...1&share_type=t






    https://www.koiforum.uk/pond-constru...ging-week.html

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