Been my first ice lake for 35yrs or so with occasional visits until ice out and have tried everything to get a consistant bite on them. When they eat they eat and there's no doubt about it, otherwise they can just sit there and look at it. Minnows, wigglers, wax/spike/mousie, big baits, little baits, noisy, quiet - it's thier call on when to hit. Think they do worms out deep, 3 or the 4 this year were caught on a Gulp Red Wiggler under a bobber, 1" off bottom near dawn in 9 FOW near the break.