10/31/2011 10:10 PM
Jeff,
We had two pair of swans at the course I was at in the Denver Metro area. They can be moderately effective in controlling young goslings (witnessed multiple drownings), but a failure as a deterrent alone for the volume of geese that lakes your size will attract. As mentioned, they can be quite aggressive, which could pose problems. As a mated pair they also become very distraught if something were to happen to the other.
We had to "capture" and house them in the dead of the winter because our lakes would freeze over. The staff could attest to the displeasure of both parties during that time period.
We tried multiple practices for deterrents: grape smelling liquids, owl eye balloons, roping edges of lakes, rubber coyote models, alligator head models, goose chaser noise ammunition, and two dogs. We could chase them to Mike B. @ Cherry during the day, but another flock would arrive by the next a.m.
Jason