Pond Boss Forums INTRO Questions & Observations winter water temp

Yes, I have. It's still a crapshoot, even without the elevator ride. For people in areas where there are two or three winter cool snaps which drive temperatures downward, you can put a greenhouse structure over a part of the pond. I saw one in south Texas once, where a frame was built across the corner of the pond, clear plastic draped over it. The catch was that it was over the northern end, where sun shined directly on it, and it was on the upwind side. The theory was that there would be less mixing of water, and the warmer water would stay segregated, since it is less dense. The unknown was whether or not the fish would find it, then stay there. Keep in mind, the water there was only too cool in the natural environment for five or six days, total, all winter. That seemed to work for this particular landowner.
Now, here's another perspective.
How much do threadfin shad cost?
Replace them each spring, if yours die off. It's not that costly for the advantage you get. I guarantee this...a batch of threadfin shad in April will cost less than the energy cost of trying to warm your water.