This may be a silly idea butt...

If you really want to keep the hole open in winter, what about a solar powered fish feeder but broadcast sodium chloride? I have seen feeders that hold 400lbs, or you could just add a hopper to increase capacity on a smaller one. You would only have to broadcast for 10 seconds, once a day, probably first thing in the morning.

Maybe?


2.5 acres, 87' Deep, Previously a Quarry