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Originally Posted by Sunil
We are having a big fish kill in this pond. Lost about 25 adult bluegill. No sign of distress on them. We've also found about 10 dead Yellow Perch and a few dead smallies.


Not sure what's causing this, but I'm suspecting some kind of D.O. crash, which surprises me. Part of me wonders, if it was a D.O. crash, if it was due to too many fathead minnows.

Sunil:

What's the water temp and what's the water clarity? Is the clarity due to turbidity or phytoplankton? You have my number, give me a shout tomorrow if you have time.

Last edited by esshup; 07/31/22 10:24 PM.

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Scott, water temps were 77/78 just below the surface, but the water was murky or stained.

Last Thursday, we had some heavy rains, and then the water got murky brown, and the fish kill started.

I would think maybe the heavy rains turned the pond over, but I can't see how we'd have such 'bad' water in the pond.


Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."

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Often in the hottest part of summer only the top few feet of water have sufficient DO. If you get a big cold rain the pond will mix/turnover and none of the water will have enough, DO. It only takes a few minutes of very low DO to kill fish. This is exacerbated by ponds with at/near carrying capacity loads of fish as they have high DO demands.

Last edited by ewest; 08/01/22 09:59 AM.















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The pond owner ended up getting a small aeration unit the first week of August '22, and since then, no more dead floaters.

We throw out Optimal Bluegill (the long cylindrical type), and we pretty much only see fatheads feeding which had been making me think we lost most all of the stocked fish. A large subset of the (85) adult bluegill we had stocked used to hit feed on the surface, but not anymore.

Yesterday, I stocked (40) more Yellow Perch 2-3" long, (40) Bluegill <2", and (6) HSB 4-5", and (6) CC 5-6".


I actually caught a healthy adult bluegill on a waxworm yesterday too. It hit the worm at about 6' below a small bobber.

This pond continues to be a mystery.

Water temps are around 60 degrees.


Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."

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