Today is the first ice free day we've had all winter. Ice was rarely thick and often had an area of open water but always had some. Today we found four dead Redear. About 4" long....looked generally ok (I'm no expert)...no deformaties. The pond is 1/4 acre...16' deep on the center. We stocked LMB, FHM, and Redear last spring. Our open-loop geothermal system empties into the pond (hence the no-ice corner). Have some algae growth already in that corner. Should I be concerned? Or is this just end of winter stress?