Fish keep dying, not sure why

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I have a pond that is doing well, but I have a friend that needs help. I have tried everything I can think of. She has a small approx 250 gallon pond, one of the premade kidney shaped ones. She has tried several times to put small goldfish in 2 or 3 at a time but they all die pretty quick. She had a pump only and it was right under the waterfall so we added a second pump, this one with a filter box, that is attached to a spitter. So now she has 2 pumps and 2 areas feeding into the pond, one on each end. We also added plants, parrots feather and hyacinth. Went and got 2 small goldfish today and they only made it a couple hours. They seemed to be air hungry...but I don't know how because the pumps should be circulating the pond volume in less than an hour. Any ideas on what the issue is?
 
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Forgot to add the water was check at pond store and everything normal. Dechlorinator used when water is added.
 
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Very distressing for you and your friend.
fish dying that quick makes me always suspect a contaminant in the water. Good all the tests were ok. is there any chance that a pesticide was sprayed near the pond? or can surface water run into the pond during rain?
My next thing to think of would be temperature shock when they were added to the water. Did you float the bag on the water for a while do the temperature will slowly adjust to the pond water temperature?
Ray
 
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I don't think so on run off, I'll check with her though. Yes they are being adjusted to the temp before going in. Thanks
 
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I don't think so on run off, I'll check with her though. Yes they are being adjusted to the temp before going in. Thanks
Check with her about possible chemicals nearby and garden spraying of anything.
If I understand you the new fish died within 2 hours of being put in the water!! that is pretty dramatic. It does imply to me that they were poisoned.
 
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Yes, hours! We got them at about 4 pm, she told me they were gulping the surface at maybe 6 or 7, by 8 they were belly up. She said she is going to empty and rinse it and start over.
 
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Yes, hours! We got them at about 4 pm, she told me they were gulping the surface at maybe 6 or 7, by 8 they were belly up. She said she is going to empty and rinse it and start over.
Make sure it is rinsed very well and the water is matured when she fills it before she adds the fish. Are the plants doing ok? There are no toxic plants in the pond are there?
 
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Too much "stress coat"? My fish supplier says if you use too much it coats their gills and they can't oxygenate....
 
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Make sure it is rinsed very well and the water is matured when she fills it before she adds the fish. Are the plants doing ok? There are no toxic plants in the pond are there?
Plants are doing fine, parrots feather and hyacinth. No plants growing around the pond, all rock.
 
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Too much "stress coat"? My fish supplier says if you use too much it coats their gills and they can't oxygenate....
The last time I actually measured it out myself.
I appreciate all the input from everyone, I really don't understand what's wrong!
 
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That's a puzzler. The speed at which the fish are dying does make you think of some kind of toxin. If it were ammonia or pH, that wouldn't happen as fast.

When she scrubs the pond, what is she using?
 
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That's a puzzler. The speed at which the fish are dying does make you think of some kind of toxin. If it were ammonia or pH, that wouldn't happen as fast.

When she scrubs the pond, what is she using?
She hasn't yet, I told her when she does to not use anything and just rinse it with water. I'm seriously thinking it's an oxygen level issue because they gulp at the surface , but like I said I don't know why with 2 pumps, a spitter and a waterfall.
 
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That's a puzzler. The speed at which the fish are dying does make you think of some kind of toxin. If it were ammonia or pH, that wouldn't happen as fast.

When she scrubs the pond, what is she using?
Although she has used a lot of algaecide in the past and hasn't drained it since. Is it possible that too much algaecide is the issue even if it's been a week or more between last use and adding fish?
 

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Sorry your friend is having this problem. It does sound like some kind of toxin. It could be too much algaecide. Drain , refill and let it run for a few days. Another possiblilty is temperature. Is the pond in full sun? Not sure where you are located but a small preform pond can heat up very quickly. Does she have a thermometer to check the water temp? Just another idea.
 
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Sorry your friend is having this problem. It does sound like some kind of toxin. It could be too much algaecide. Drain , refill and let it run for a few days. Another possiblilty is temperature. Is the pond in full sun? Not sure where you are located but a small preform pond can heat up very quickly. Does she have a thermometer to check the water temp? Just another idea.
We are in southern Tn, and it's basically a full sun spot. If temp is the issue what could d? She did recently add some plants to the pond.
 
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Although she has used a lot of algaecide in the past and hasn't drained it since. Is it possible that too much algaecide is the issue even if it's been a week or more between last use and adding fish?
Yes! I think you landed on the answer right there. That stuff can definitely kill fish and FAST.
 
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Yes! I think you landed on the answer right there. That stuff can definitely kill fish and FAST.
Oh man I hope that's all that it is! Like I said she plans on draining today so that would fix that issue.
 

mrsclem

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We are in southern Tn, and it's basically a full sun spot. If temp is the issue what could d? She did recently add some plants to the pond.
Shade fabric over the pond of some sort. Even a beach umbrella. Are any of the plants in the pond potted with some kind of soil? Most everybody uses plain cat litter.
 
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I have a pond that is doing well, but I have a friend that needs help. I have tried everything I can think of. She has a small approx 250 gallon pond, one of the premade kidney shaped ones. She has tried several times to put small goldfish in 2 or 3 at a time but they all die pretty quick. She had a pump only and it was right under the waterfall so we added a second pump, this one with a filter box, that is attached to a spitter. So now she has 2 pumps and 2 areas feeding into the pond, one on each end. We also added plants, parrots feather and hyacinth. Went and got 2 small goldfish today and they only made it a couple hours. They seemed to be air hungry...but I don't know how because the pumps should be circulating the pond volume in less than an hour. Any ideas on what the issue is?
I have the same size preformed pond with a Tetrapond UV bio filter 1500 with a Pond Master 2000 prefilter and Lifeguard All in one filter. My pond is also shaded. My water would run high on nitrates all the time and I had to do frequent water changes. Also had hair algae growing in my stream. About a month after changing 1/2 of the water and filter/bio rinse, the nitrate would run high again and the koi’s were sluggish and would not eat and stay at the bottom of the pond and If I didn’t catch this, I would lose a few of them.

Frustrated I changed the bio balls inside my Tetra Bio filter. Low and behold, the water nitrates is now good and the hair algae that grew in my stream and on the edge of my water fall that feeds to my pond went away.

Never heard or knew of bio balls becoming toxic or contaminated. Anyone else experience this?
 
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