When I first aerated I aerated through the winter in the center of the pond and stressed the heck out of my bass. Didn't bother the trout in the same pond, but I believe that is because they can handle colder water. Come spring I had stressed bass and many with fungus. So after hearing that it was not a good idea the following winter I put the diffuser in shallow water and kept a small hole open. Much better result but still some bass stressed. Now I just remove snow periodically and haven't had any problems since.

If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.