You just need a smaller venue to overwinter the tilapia in. If you had a micropond like Meadowlark's, 100 gpm at 67 degrees would keep the temp up easy; your biggest problem might be non-cooling aeration of all the well water.

I was unsuccessful trying to find ML's micropond thread - hey ML, what's the link?

Also check out Ryan Freeze's Tilapia overwintering in a tank, IIRC on the order of 1500 gallons. Here, I believe.


"Live like you'll die tomorrow, but manage your grass like you'll live forever."
-S. M. Stirling
[Linked Image from i.pinimg.com]