Help me please...koi are dying

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In working with what you have and leaving your skimmers as is for now, consider netting your pond from falling leaves, then your skimmer won't clog and lift. There are lots of places to get nets and some people use fishing line and "sew" them together for larger coverage.
 
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Quarantine Tank Test

Time: 10:30am
Water temp: 58F
PH: 7.8-8.0
Ammonia: 1ppm
Nitrite: 0ppm

**Note: Prime added at approximately 10:15am
 
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Still have three koi today. They look pretty good...the are calm. The medium white one looks a little pink tinged in areas so that’s not too good. He has some raised scales on his right side near his tail but I think that’s where he abraded himself when he jumped out of the quarantine tank, and the area reduces in size every day. Test results for today:

Quarantine Tank
Time: 1:00pm
Water temp: 63F
PH: 7.8-8.0
Ammonia: 1ppm+
Nitrite: 0ppm

Should I add more Prime?

Main Pond
Time: 1:05pm
PH: 8.2-8.4
Salinity: 1-2ppt

Starting another water change on the main pond.

Oh, and here’s a short video about the main pond overflow system:

 
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Hmmm... interesting overflow concept. Is that all your property? I don't know what the laws are where you live, but in our municipality you are allowed to plumb any water right up to your lot line. We learned that when our neighbor decided to solve his sump pump problem by pumping into our yard. (The story has a happy ending though - just learned a lot about small village governments!)

I think I would at the very least put some screening over the end of that pipe to prevent any fish from getting swept down the pipe - your big koi would be fine, but any future babies might find themselves high and dry. You're probably far enough from the wetland that there's little chance anything would make it from your pond all the way down there, but again - I don't know your local ordinances and how they would apply.

As for the water testing - hopefully @MitchM will see this and pop in. I'm not a water tester so I don't know how to advice you on that one! Good news on the three who are still alive!
 
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Yes with another dose of Prime.
Thanks for posting the test results and that video on your overflow.
With the salinity reading on the main pond, I'm becoming more convinced that the pond was salted to begin with, so it's good that you're measuring and bringing the salinity down now. It will be easier on your fish in the long run.
I also think that's what probably negatively affected your 2 largest koi.
Once the salinity is down to zero or close to, and we have the KH/GH numbers, we can make any final adjustments and get your koi back into the big pond.
As your overflow drains onto the surface, I don't think that will be against any laws (if you own that land), but if you have a chance, it would be good for you to learn what the laws are. A screen like Lisa suggested might be all you need to prevent any problems down the road. Your proximity to a wetland could be an issue.
I live 1/2 a mile away from the nearest natural pond (which we own), and I would still need to have an inspector come out and inspect my setup if I wanted to keep Tilapia. Goldfish or minnows are apparently fine. You never know how laws are worded.
 

addy1

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Way to go everything heading in the right direction!
 

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Thanks for the updates! A lot of people join, then we never hear from them again— never know if there was a resolution to the problem.
 
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You’re very welcome. In kind, thanks all for the continued replies and guidance. So much appreciated.

Yes we own all the property to about halfway into the swampy wetlands; the pond overflow drains well inside the property line.

Still have three scaly friends today.

This morning’s test results:

Quarantine Tank
Time: 7:35am
Water temp: 61F
PH: 7.6
Ammonia: 1ppm
Nitrite: 0ppm
**Note: added Prime yesterday evening

Main Pond
Time: 7:40am
PH: 8.2
Salinity: 0ppt

So the PH continues to creep down in the quarantine tank. There is still some pinkness to the medium white koi. I can’t tell with the two smaller orange koi. Should I add another dose of prime? Regarding the GH/KH test kit I’m kicking myself. I thought I could find it locally so I didn’t order one because it was going to take a bit to arrive. I’m having trouble finding a kit locally now and should have just ordered it. I got a couple leads on other possible local sources so I’m following up this morning and will order the kit with expedited shipping if I come up dry locally.
 
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Yes to Prime.
No more water changes in the big pond, it's PH should start dropping.
Try feeding the fish a small amount to see if they're interested in eating plus it will give you a chance to inspect them a bit closer.

What % do you think you changed of the big pond's volume?
What fish food are you using?
 
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Okay, will add Prime.

I’ll will try feeding the koi a little food later today. We use and have consistently used Hikari Staple medium-size pellet food.

I did a total of three water changes on the main pond, and pumped out about 3” of water each time. That was about 15% volume by my calculation. In total I estimate the total volume change was 40-50%.

I think I found GH and KH test kits at a local pool and spa supply store. I’m going to go later this morning and see.
 
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Still having trouble finding GH and KH tests. :[

Have one more place to test tomorrow. I *do* have test strips that have a “total hardness” test. I was told by the pool and spa store that is the same as calcium hardness. Is that true? Will that tell us something if I dip and test that later today?
 
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The “Total Hardness” of the main pond using the test strip pictured below is between 100ppm and 250ppm...closer to the 100ppm range. I realize that’s a wide swath and the particular measure may not relate to the suggested GH or KH tests...but...it’s something (maybe) for now.

426FCA70-B9F5-4EF5-8FFA-5C1CE468D45A.jpeg

I have one more place to check tomorrow for a GH/KH Kit and if that fails then I’ll be ordering the API GH/KH test kit off of Amazon or the like.

The koi do not seem to be interested in food, though they may have simply been wary...it did look like the medium white one was maybe munching at matter down in the rocks though.

5302C0E4-E778-44A5-B8E0-38AC2A72FE91.jpeg
 
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Total Hardness or General Hardness is a measurement of calcium and magnesium.
Carbonate Hardness is different and is a measurement of carbonates.
They are different.
Test strips are pretty inaccurate, the best they will tell you is that you have "some".

Maybe put a piece of plywood over half the quarantine tank to give the fish a sense of security.
 
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So the bottom line is I can’t put the koi back in the main pond until we know the GH and KH?

We have some important plans out of town Wednesday through Friday this week...and with my work schedule and other demands, if I can’t find the GH/KH test kit in town here, I don’t have the ability to drive up to Portland and hunt for one.

Still kicking myself for not simply ordering one last week online. Dumb.
 
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It's pretty important to match Temperature, PH and KH before you transfer the fish.
Since you are going away for a few days, I think it would be better if the fish were in the big pond so we'll have to forego the KH.
Over the course of an hour or so today, remove some water from the quarantine tank, and replace it with water from the pond. Try to do it about 6 times, about 10 gallons at a time. At the end of the hour, test the PH and temperature, make sure they're pretty close then transfer the fish to the big pond.
Temperature difference less than 5 degrees and PH less than 0.2 difference is acceptable.
Have a look to see if that discoloration has changed on that one koi. Hopefully it's gotten better.
 
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Okay. Will do this after work today, or tomorrow morning. Will still look for and acquire GH/KH test kits because that seems important long-term. Will report back.
 
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