No different than spearing pike. They aren't typically as aggressive as pike obviously, but I've had a lot of walleye come in to the decoy even when the decoy is mid way in the water column. There have been days during last ice when the big females will come through on the exact same path, like they are migrating to their spawning areas or something. Fortunately they don't seem as interested in feeding at that time or they would be even more vulnerable. It wouldn't be out of the question to spear a limit of 10+ lb walleyes when the conditions are right.