I have a follow up question to Larry's. If you could completely eliminate the entire thermocline in a pond, would it be a desirable thing to do? Don't fish need some measure of temperature differential in order to regulate their own temperature? (This is not very well worded, hopefully you understand what I'm asking).

JHAP
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"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives."
...Hedley Lamarr (that's Hedley not Hedy)