Where I do some work throughout the summer and winter the homeowner has two large ponds and im looking to get rid of my two large dempseys but the only two lfs stores in my area wont take fish. The lower pond that was just re-done last year is probably 8-10 ft deep and the main Larger pond is a bit deeper and houses rainbow and brook trout for many years. Im wondering if I put the dempseys into one of the ponds if they would have a fair chance at survival year round. The ponds do get ice on top but both have drains and the main has a waterfall feeding the pond from a river. We do get a good amount of snow here and occassional below 0 temperatures in winter.