I have friends with cabins on what can rarely be called a lake. Most of the lake is 4-5 ft deep, bottom all muck, but very clear water. The fact that such a lake is clear, tells me that there might be springs feeding it. It has one 10 ft hole, which is where we fish in the summer. We pull nice pike and bass out of that hole in the summer. There is no public access on the lake, and only a handful of cabins. So there is little to no fishing pressure.
Anyway, in the winter, we cannot find these pike and bass in the hole by either flasher or camera. I know bass are typically dormant during winter, but I would still expect to see them. Do you think the fish are all just in the weeds hanging out? Or could there be other springs around the lake that they are hanging out near in order to get fresh oxygen. Obviously, this is a prime lake for winterkill, if the snow is thick enough on the ice. But again, we catch really nice pike and bass so winterkill recently.