Our koi pond takes about 3500 litres of water - about 60cm deep. Fortunately the Koi are still really small - we will obviously have to reduce the amount of fish when they grow bigger. We seem to have a problem with crows "hunting" our fish - I've caught 2 crows stalking them yesterday! Would they actually be able to catch the fish? If so, we will have to put a cover over the pond to protect them.
Please advise!