I am by far no expert, but I'm in central Maine, my ponds are frozen from Nov-May. The deepest a little less than yours, the shallowest less than 10 feet.
I have no bass that I know of, but all of my ponds are filled with fish. Being iced over half the year sure isn't hurting them. I have at least a couple kinds of sunfish, chubb and brook trout.
My ponds are spring and stream fed, I don't do any aeration or circulation. They are au natural lol.
