I'm interested in seeing what ice out brings to the ponds in my area concerning RES. Many of us opted to aerate all, or at least much, of the winter due to extended snow and ice cover. This has apparently cooled the water temps down below the 39 degree norm encountered at or very near bottom, in the "safe" refuge.
Perhaps regional adaptation has led to some slightly hardier RES in my area.....at least that's what I'm hoping for.