That's interesting information Bocomo.

It also raises several questions for those of us way down south. What if your pond surface never sees 39F? Does it not have a winter turn over? Or just not as quickly?

I shut my aeration down about the same time as QA, and at that time, the variance top to bottom (10ft) was 3 degrees, and while I haven't taken a top to bottom reading recently, my last surface reading was still above 50 this past weekend.

Before aeration, I know the pond had a spring turnover, as you could see it.
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.10 surface acre pond, 10.5 foot deep. SW LA. The epitome of a mutt pond. BG, LMB, GSF, RES, BH, Warmouth, Longear Sunfish, Gambusia,Mud Minnows, Crappie, and now shiners!!...I subscribe!!