Start with the basics. BG metabolism is slow under the ice thus they don't need to eat as much or as often. Because they are in the bioenergetics mode of energy saving they would be close to their food so they don't have to waste energy moving a lot, which should be near plankton concentrations (light and O2). Slight temp increases can stimulate increased feeding.
EWEST,
You would be surprised at how much the fish do move around under the ice. Definitely not nearly as much as in the spring/summer, but way more so than I originally thought before the use of cameras and vexilars.
