Help with dead koi


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Oh no! I am so sorry!

Can you tell us a bit more about your pond and set up - filtration, size of pond, how many fish, anything that may have changed, current weather, etc. Anything you can share may point the way to the answer to what happened.
 
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Tail fins look rather red, was that normal for your koi? Water conditions? Did you test the water? Any new fish, plants?
Sorry for the loss, and hopefully we can help you get to the cause. My first thought is either infection or ammonia spike based on the red look of the tails, but I’m no expert on koi.
 
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I was wondering about all the redness, too. Also, one of the fish seems to have a pretty pronounced notch in its nose. Has that always been there?

I would guess a bacterial infection, or perhaps possibily Costia or even KHV because of that notch.

Have you checked the gills of the dead fish?

I'm definitely no expert on diseases. Maybe someone who is much more knowledgeable than I am will come along to help.
 

j.w

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@PaulS19

That's what I noticed too, the red streaks. Sorry for your horrible loss. Sometimes the bigger fish die first due to needing more oxygen and if pond is somehow low in oxygen that could be the result.
 
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Sorry for the loss of your koi :( I'm guessing a bacterial infection from the condition of the fish in these pictures. As other's said, more information will help us help you.
 

addy1

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Welcome to our group.

Post some info about your pond and do water tests so we can help you. Post the results. The liquid tests are more accurate.
 
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Not that this is going to solve anything.

But If you test your water and everything is fine. And If you haven’t had any lawn chemicals or foreign substance accidentally introduced into the pond. No rapid changes in weather.
Then the only way to tell is to have a lab or someone look at, take blood, (not sure of blood can be checked after dead) and dissect.

I just watch a video of something similar. Girl had like 20 of some kind of fancy gold fish she was breeding. The all got sick. Showed signs of dropsy. Such as raised scales.
she sent 4 of the worst ones still live to a lab. They took samples and dissected them.
Even with all there equipment all the could tell her was. They showed signs of kidney failure. They had hardened Nodules all over their Kidneys. The nodules were from its immune system fighting something. Either bacteria or parasite encasing it to stop it. Which lead to fluid retention causing the scales to pop out and be inflamed.

So after all that they sent her a letter stating they couldn’t tell exactly what caused there death. But explained what they found and the it was either a parasite or bacteria. But could not tell what kind. And have her no definitive answer.

I found the video.

She is a pretty experienced breeder with gold fish. Her YouTube channel is pretty good. She has a shit ton of fish and pets

Fish are fish diseases are the same koi goldfish all types of carp.

 
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sorry for the loss after 12 years is never easy to loose a pet / family. I wonder if you haven't told us in your state,ment what the problem was. You said that there are 5 month old koi in the pond and they are all fine. Unfortunately the large fish will be the first to go when there is a lack of o2 .. i imagine you have a healthy set up but did something change in shutting down for winter did you switch to a heater element over air or vise versa?
 
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gonna try to help, did you add any fish- plants to your pond? a close up of the fish will help. knowing which state you live in will help.do you test the water????at first look it looks like nitrate got it. or ammonia. or both but could be a disease. so first catch a fish. swab it with a glass slide then hit the microscope fast... this will tell if you got anything crawling around...were the fish flashing or staying on bottom by falls? jumping? or on top breathing air? if you can answer these i might be able to help .. sorry about the loss.mike
 
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Tail fins look rather red, was that normal for your koi? Water conditions? Did you test the water? Any new fish, plants?
Sorry for the loss, and hopefully we can help you get to the cause. My first thought is either infection or ammonia spike based on the red look of the tails, but I’m no expert on koi.
Red leg in frogs is deadly, usually occurs during winter. Its BD virus usually transfers from bullfrogs.
 

Mmathis

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I’m so sorry to hear about your loss! Agree that we need lots more information about your pond. It is odd that all of your fish would die suddenly, after such a long time, but it’s impossible to give advice without any facts to go on.
 
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4 other fish in pond about 5 months old fine. Very sad.
I am in nw NJ, also have a pond 12+ yrs. My koi were same age, over 12in. 6 koi + 16 goldfish. 4 koi died 2wks ago, all goldfish are fine. The pond is approx. 750gal. 28in deep, Was cleaning out leaves when I found the 2 largest koi on the bottom. Over the summer, they had eaten a large waterlilly but nothing else unusual. Do not know why, after these years , they died.
 
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sorry to hear this; it could be a thousand things, ill try to narrow it down the best i can. do you test the water on a regular basis? if so whats the readings? did you add water? its cold here whats the temp there.eating or pulling up a lilly wont kill fish . did you notice the fish at the water falls and wont budge? did you notice fish flashing? do you feed ? do you stop feeding when water temps reach 50 ?is or was the pond covered in ice before you saw this?
 

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750 gallon is too small for koi. They have grown over the years and probably outgrown your filtration. If you test your pond water, can you post results?
 
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the post above is true, if the water was tested on a regular basis this would tell you fast. it does sound like a HEAVY load. but you never know , unless you test. if the water was good it will narrow it down.
 

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