Great blue heron (Ardea herodias)BIRD DAMAGE AT AQUACULTURE FACILITIES


Damage Prevention and Control Methods


Completely enclose small ponds, tanks, and/or raceways with screen or netting.


Partially covered systems with overhead wire, line, screen, or netting. Perimeter fencing or wires.

Metal spines, cones, or electrified wires for roosting problems.

Cultural Methods

Consideration of local bird populations, construction of pond margins and bottom profile, location of fingerling ponds, and feeding techniques may lessen damage.


Various devices available include reflecting tapes, eyespot balloons, scarecrows, automatic exploders, pop-up scarecrows with exploders, pyrotechnics, alarm or distress calls, lights, water spray devices.

Aerial harassment with ultralight aircraft, radio-controlled model airplanes; ground harassment with
vehicle patrols.

Roost dispersal may move depredating birds from the area.

AvitrolĀ® is a chemical frightening agent for herring gulls and blackbirds.


None are approved for use by federal or state agencies.


Except for some blackbirds, trapping is not allowed without a permit from the US Fish and Wildlife Service and upon recommendation by the USDA-APHIS-Wildlife Services. Permits are issued to
compliment ongoing nonlethal methods. Check county or state permit requirements.


Same as for trapping, except that some blackbirds may be shot. Ducks may be hunted during waterfowl hunting seasons.

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