I have 3 plugs that are mouse plugs and many flys like that as well. they work great if you make them scurry ( type of movement \:D ) across the water and stop them every so often. When they stop they get nailed!!

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1/10 - 1/4 acre pond plus 16 ft deep/ Plus 40 ft by 20 ft by 6 ft deep koi and fathead minnow pond next to it. Upstate NY