Cecil, Thanks for the reply. My areator in the shallow end went out for about a month (the other in the deep water is turned off in the winter)and the pond iced over. I did clear the snow off to allow light to pass through. My pond is only 2-1/2 years old so I don't think I have an over crowding problem. I stocked plenty of minnows in the fall for the fish to eat this winter. Once the ice came off. I didn't see any dead fish floating. I appriciate the info!!!