Koi continue to die

Discussion in 'Fish & Koi Talk' started by Beckie, Oct 14, 2017.

  1. Beckie

    Beckie

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    I posted in August about my koi dying....the largest ones, around 10 years old, well-established appx. 2000 gallon pond. Several have died, in spite of a near perfect water balance, absolutely no signs of disease or injury. With all the rain previously, then a hurricane, we've had tons of frogs and toads mating in the pond. I did some research and it's possible, but wondering if poisonous toads (Florida) were laying eggs in the pond and the bigger fish were eating them? We started catching toads, and no deaths for a couple weeks.

    (Side note: I thought at first they were getting stuck in the pump box as that's where I found most of them. Put a cage over the inlet (thanks for the suggestion!!)...then found one floating up against the cage.)

    Just found my last original fish dead in the pond this morning. It showed no signs of illness or stress the night before. Anyone have any ideas? Any problems with poisonous toads?? Any suggestions?
     

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    Beckie, Oct 14, 2017
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  2. Beckie

    Gemma

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    Oh Beckie I'm so sorry!
    How many fish were there when the first one died? I'm thinking this could be the result of lack of oxygen, due to overstocked pond
     
    Gemma, Oct 14, 2017
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  3. Beckie

    Beckie

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    I started years ago with only 5, had to dig a bigger pond when they kept having babies and ended up with 16! Lost 3 over the years to a dog, a bird, and one that had been notorious for getting in the pump box to get the last morsel of food. So, 13 fish in a big pond, 4 ft deep, 2000 gallons, and very good waterfall flow. Had the 13 fish for years and years, very well balanced pond...only this past few months have I had any problems. Down to 7 fish, so I've lost 6 in the past couple months.

    Had water tested and it confirmed my results...great water quality. The fish aren't struggling or acting odd in any way the day prior. I find them dead. When I remove them from the pond I see no sign of disease or injury. I've had an incredibly healthy pond with fish all these years.

    The only thing I've found is poisonous toads are a possibility. We've had some ugly ones hanging around, too. One looked similar to a Cane toad but didn't have all the features.

    And why suddenly is this happening?? We have toads and frogs all the time.
     
    Beckie, Oct 14, 2017
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  4. Beckie

    Gemma

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    Is there a pond place where you could get an autopsy? That's how I found what was happening, when mine were suddenly dying, years ago
    I hope you can figure it out and save the rest of the fish
     
    Gemma, Oct 14, 2017
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  5. Beckie

    Beckie

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    Not that I know of...what did you find out about your fish?
     
    Beckie, Oct 14, 2017
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  6. Beckie

    Tula

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    Do you have a local koi club? If so, I'd contact them and see if they can help you. One of their members will have a microscope, and you could scrape and scope one of your remaining koi, to look for parasites. I've read that frogs can bring in parasites.

    I'm so sorry you're going through this.
     
    Tula, Oct 14, 2017
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  7. Beckie

    Gemma

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    My fish die from arsenic poisoning!
    We built a bridge out of pressure treated wood to shelter the fish from the Heron, (we didn't know any better) every time it rained, arsenic leaked in the water
    After the first few died we decided to pay for an autopsy, we then removed the bridge and changed all the water but still the damage was already done, and one by one all my fish died
     
    Gemma, Oct 14, 2017
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  8. Beckie

    Gemma

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    great idea! I'd check Facebook!
     
    Gemma, Oct 14, 2017
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  9. Beckie

    sissy sissy

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    Have you checked the oxygen levels and were all the fish that died 1 sex .I have seen fish that have died from being egg bound from temps ,but since you live in a warm climate it is unlikely .Have you made sure nothing could have gotten in the pond that caused a lot of stress and have you made sure it is not an electrical short in a pump .
     
    sissy, Oct 14, 2017
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  10. Beckie

    CometKeith

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    Beckie I'm very sorry about your fish. I would guess they died from lack of dissolved oxygen. These are my reasons; The hottest months like August are when the water is the warmest and there is the least saturation of dissolved oxygen. Typically overnight the O2 dips to the lowest levels and you found the dead fish in the morning. The largest fish died first and larger fish need more oxygen than smaller fish and are the most susceptible to this problem. Typically a fish that dies from lack of O2 doesn't show any other sign of distress or disease. I have seen a number of posters on this site that had successful ponds for many years and suddenly their biggest fish died and it was due to a lack of O2.
    My understanding is the problem happens suddenly when the problem gets to a catastrophic level where fish die without warning. For all these reasons I think lack of dissolved oxygen caused the problem.
     
    CometKeith, Oct 15, 2017
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  11. Beckie

    Gemma

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    This happened to me, when I didn't know about overcrowding, and that's why I asked about number of fish in the pond, but one could have poor dissolved oxygen even in a pond that's not overstocked, so I would increase aeration just in case
     
    Gemma, Oct 15, 2017
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  12. Beckie

    Magzire

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    No aerator? Seems crazy not to have one
     
    Magzire, Oct 16, 2017
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  13. Beckie

    Angel

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    i didn't have one for 8 years no issues i added this year for winter. so aerator is not always needed
     
    Angel, Oct 16, 2017
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  14. Beckie

    Magzire

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    But the koi got bigger consuming more or maybe the pond bio used up more. what else could it be at this stage?
     
    Magzire, Oct 16, 2017
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  15. Beckie

    IPA

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    Could it be stray electricity?
     
    IPA, Oct 17, 2017
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  16. Beckie

    sissy sissy

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    One reason I got my 12 port aerator was the fish were getting bigger so magzire s right .Heat and warmer water can cause an even bigger lose of oxygen along with plants using up oxygen at night
     
    sissy, Oct 17, 2017
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  17. Beckie

    Faebinder

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    This is a good post example of what could have happened to the pond.... it’s possible that someone is spraying their nearby yard with antiweed material that is getting to the pond via air. This is a pond so water is not being changed much like a river... pollutants from near by pile up.

    Do you spray anything in the area?
     
    Faebinder, Oct 19, 2017
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  18. Beckie

    sissy sissy

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    Also said heavy rains happened before this all started .But the you never know .
     
    sissy, Oct 19, 2017
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