Originally Posted by turner_landscaping
I have used fishing go around the edges of the pond. Set it back from edge bout 6 10" and about 12 to 18" off the ground. Use rebar or whatever else to the line attache too. The herons cant see the line and run into it. They cant step over it cause of height and distance from pond they leave.. works very well around here and deal with them on a daily basis.
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This is probably the most overall effective (and legal) method. You can add a 'Scarecrow' deterrent as additional insurance.