We’ve been trying to figure why the koi have been huddled on the bottom: we feared a crisis of water chemistry, and a dozen different things—but an adult male Bald Eagle plunging out of the sky?
We put up the winter shelter ring, a 6 foot circle of floating black shade stuff that will cover them in the deep end; and I finally (too late for some of our koi) put up the Scarecrow water jetter, which I hope will scare the blighter off. He may be an endangered species and our national bird, but he’s not persona grata in our back yard at the moment!
Bill Bailey (an excellent English comedian) mentioned on an episode of QI that he had trouble with herons getting his pond fish. After trying a range of protective devices he succeeded by adding a model crocodile into the pond which scared the birds off.
May be overkill, may be just a joke, but I can just see a reptile lurking under your finished bridge waiting… just waiting 🙂