There's a guy in Illinois who is running O2 to the water that's under the thermocline in his deep lake and getting trout to live year round.

I think that if you could bounce the water over some rocks in a shaded area, then put it in the pond, it might do the trick. Well water uptakes O2 rapidly.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).