Yes, you can put wooden stakes up around your pond and run brightly colored braided fishing line fron stake to state. I would run a couple of strands. The don't land in the water and need to wade in to do their damage. If you make the strands high enough they can't step over, but low enough they can't crawl under, you are in business. Or you could put up an electric fence. One contact with some juice will definitely discourage them. You can also train a dog to run them off.
