I'd be curious as to how long these would last. I've seen flocks of white pelicans descend on retention ponds and wipe out most of the fish in a couple of days. I would think that a single fish-eating bird like a Great Blue Heron or a Great Egret or a Wood Stork could empty a small, backyard pond of all of its fish in pretty quick order. And it might even be illegal to try to chase the bird off.
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