Tom, you're right about the plants helping with the oxygen below the thermocline. If a small amount of sunlight can penetrate to the bottom, beneficial weeds will establish themselves and give off oxygen in the hypolimnion.

Option 2 for establishing oxygen below the thermocline is more drastic. I am working on a small scale "hypolimnetic aeration system." If plants don't establish oxygen down there this year, we could test this system out on your pond if you'd like. We'll talk about it when you call, and in the meantime, I'll get some prices together for different temperature & oxygen meters. I did have a used meter for sale, but I ran my $900 meter over with a truck, so I'm currently using the spare.


Mike Robinson
Keystone Hatcheries