At the lake where I fish most often the thermocline on average is about 30-40ft deep. I was wondering, why is it so deep compared to ponds? I know lakes are much more deeper, but I wouldnt think that would have much of a considerable effect. Also I was wondering if there were any type of pond design considerations to deepen the thermocline or prevent it in becoming shallow.

I know many have posted concerns and interests in stocking deep water fish which often times include Walleye, Perch, and Stripers. I just dont understand how a lake that is 50ft deep can be 80% liveable by fish when in a pond during summer it may only be 30%(a 15ft deep pond with a thermo at 4.5 ft.)

Also others have mentioned that a thermocline can be 'felt' when jumping into a pond or lake. Well from experience during summer I have felt this at around 5-6ft deep, however you will never find fish above the 5ft mark, only in deep waters around 20ft. From what I have 'heard' about the thermocline is that this region and up is the only area in which a fish can stay and live for an extended period of time. It just doesnt add up.

Maybe some of you can shed some light into this situation. I did a search but couldnt find anything as detailed as I'd liked.

Chris