Help my Koi!!


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Need help with diagnosing what is wrong with koi. We have a 2500 gallon pond with about 15 koi we treated a koi earlier this year for somewhat same symptoms but this guy is much worse missing most of top scales, have red and black spots, a large lesion on tail fin and a gooey substance growing out of Gill was milkish to color but after treatment starting to turn brown.

Pictures are koi in quarantine bucket.
 

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j.w

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@Kenz
I don't know either but lets hope someone can help you soon. What did you treat it with?
 
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Oh my. That fish is in a bad place. That's so sad.

I don't know exactly what it is, and it may be that it's more than one thing, but I have to believe you have a water quality issue. Do you test your water? If not, this might be a good time to start.

Tell us a bit more about your pond - 2500 gallons, 15 koi. Are they all the size of this one? Did you add any fish before this started the first time? Did the fish all recover from the first experience? Why did you choose Knockoout as a remedy? What kind of filtration do you use?

My first instinct is to suggest you have too many big fish in a too small pond. Nature may be taking care of the situation that is created when that is the case. "Curing" the fish without changing the environment won't help.
 
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I agree with Lisak1. Fin rot is usually a result of poor water conditions, so your water would be the first place to look.

You may be able to cure the fish in a quarantine tank, but if you put it back into toxic water it will happen again.

Always fix the water first.
 
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Oh my. That fish is in a bad place. That's so sad.

I don't know exactly what it is, and it may be that it's more than one thing, but I have to believe you have a water quality issue. Do you test your water? If not, this might be a good time to start.

Tell us a bit more about your pond - 2500 gallons, 15 koi. Are they all the size of this one? Did you add any fish before this started the first time? Did the fish all recover from the first experience? Why did you choose Knockoout as a remedy? What kind of filtration do you use?

My first instinct is to suggest you have too many big fish in a too small pond. Nature may be taking care of the situation that is created when that is the case. "Curing" the fish without changing the environment won't help.
I completely agree we have been doing a treatment to the main pond as well as the guy in quarantine, we back flush our pond regularly and always make sure that the proper chemicals are in at the proper times. This guy is actually one of the bigger koi we have now, most of them are smaller. We have probably about 3 that are his size maybe a little bigger and others are half the size.
 
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What chemicals are you using?

Please test the water and post the results here. That will give us something to go by and an indication of how your pond is doing. Don't use the testing strips. Those are not accurate. You need the liquid tests for ammonia, nitrite, nitrate, pH and KH.
 
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This is pond
 

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What chemicals are you using?

Please test the water and post the results here. That will give us something to go by and an indication of how your pond is doing. Don't use the testing strips. Those are not accurate. You need the liquid tests for ammonia, nitrite, nitrate, pH and KH.
Sorry Not chemicals just algea and poo clean up stuff.
 
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Yes, I would consider those chemicals.

Still need some numbers for your water tests, and the type of filtration you have. There isn't much we can help you with without more information.
 
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Okay I will go get a test kit this afternoon hopefully some time, this is the koi we treated earlier, he is all better now. Wound on the tail fin is completely healed now.
 

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We started the pond and the sick fish with this knockout yesterday. I only have test strips right now pond tests out at 60GH to 120GH 80KH to 120KH 7.5 ph 0NO2 0NO3 maybe 20NO3. Kinda hard to tell the colors for me. Probably going to get an actual tester later.
 

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Pumps for pond
 

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Without knowing what's causing the problem I wouldn't be treating the whole pond. But that's just my opinion.
 
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Mmathis

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Without knowing what's causing the problem I wouldn't be treating the whole pond. But that's just my opinion.
Agree, and share that opinion. But it’s almost surely a water quality issue — but it’s the kind of issue where you do a complete reassessment of your husbandry.
 

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