A buddy and I used to dive a quarry in East Tennessee years ago. It was probably 60 feet deep and gin clear. NOT only could you feel the difference in the water density, but you could literally see the thermocline. It was like looking thru some of that old wavy window glass.

.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!!