in wisconsin, when there is an open spot in the ice carp will come to it and suck air. there could be a couple to every fish in the lake or river at this spot. this mostly happens in late winter when we have had a couple of warm spells. some guys walk the edge of the ice, some go out in wadders, and some push jon boats out.
I have wanted to try cutting a whole in the ice and sit in a shack and wait but have never found the carp in the winter any other way.