The labrador girls and I scared away our heron over a period of a day. It never
came back (that we know of).
Here are a few methods:
Heron tips:
- netting over the pond.
- put in an electric fido fence
- a motion activated sprinkler
- Migratory Bird Act forbids lethal methods,
heavy fines and jail time take away from pond time ;-)

good luck!
k30a
and the watergardening labradors
http://www.geocities.com/watergarden...dors/home.html