Actually, raccoons don’t swim, so if your pond is built at least 2 feet deep and 8 feet wide, with some places for your fish to run and hide- they should be safe from those little nocturnal critters. The only critter that is a valid concern is the heron. Again, providing a place for your fish to hide (in and under water lilies, and other plants, or man-made fish caves) will help prevent any disastrous occurrence of fish-napping by a heron.
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