Predator Deterrents for Ponds and Water Gardens Stop Blue Herons!
You have designed and set up your pond and stocked it with Koi or other prized fish. One of the first problems you will encounter is how to control nuisance wildlife or birds from eating your fish. One predator is the heron. Herons usually feed alone (not preferring other herons feeding at the same, small pond at the same time) but swallowing a large fish in one destructive gulp is what they do best.
Decoys are deceptively simple, but work. Some predators are territorial and will not intrude on an area they perceive as already dominated by one of their kind. Others simply won't risk attack from a natural rival like a snake or owl. For optimum effect, decoys need to be moved about frequently so that predators don't catch on.