I think my wife may have stumbled upon a solution to our heron problem. And
it's really cheap!!!

We love watching our koi play with floating orange sections so one day my
wife thought she'd see if they would play with a beach ball. She put a
multi-colored 12" one in the pond. No, the koi weren't attracted to it, but
the current and wind kept it moving and spinning. We haven't seen a heron,
nor have we lost a single fish this year.

Has anyone else tried this?

Gary
Hingham, MA