Pond fish can be vulnerable to a variety of predators, including large birds such as the pesky blue heron. Fortunately, Aquascape provides several products to help pond owners prevent predators from harming their prized fish. Keep geese and heron away from your pond with the Aquascape Floating Swan Decoy. This realistic swan decoy features a lifelike appearance designed to protect your pond from pests like the Canada goose. Geese cause several issues for ponds and water features. primarily by grazing and creating excess waste. leading to poor water conditions for your pond fish. Other pests and predators. like the blue heron, will prey on pond fish, leading to fish loss. Due to the territorial nature of the swan, geese and herons will often avoid locations where they find a swan is present, helping to keep your pond clean, safe, and healthy.