Did try them at Lake of the Woods this Dec. with mixed results. Tried not a whole Gulp minnow, but just the head on a variety of spoons. Did catch some fish on it, but could not see a difference between that or a real minnow head. Fishing was very poor those days, so I will not draw a conclusion yet. Because they are a biodegradable product, could it be the colder water is not allowing the bait to give off its maximum scent? Just thought I would throw that out there.