New to this forum so here to say Hi and I look forward to being part of this community. My pond is over six years old with a mixture of 40 fish including koi, shubunkin and goldfish. Lost a few in the first year to an unwelcome heron that flies in from the Grand Union canal nearby. Hence a net over the pond solved the problem but spoils the scene rather. However, I would rather keep my fish safe. A photo is attached. Cheers everyone.