Jawbone,
Another option would be to allow the pond to freeze up this winter if the springs don't bring the water level up very much. This should kill the fish off.
What size is this pond?
Bill Cody --- has anyone ever considered using any of the chemicals used for weed control or parasites but at a high enough level to cause mortality? What about using a lot of salt in the pool which will be diluted when the pond fills up again? You can get 50 lb bags at feed supplies relatively cheap. The species Jawbone is talking about can only tolerate a salinty up to a certain level.
