I had a problem with herons on my pond and cured it very cheaply. At the builders yard they sell large metal grills which go between concrete to reinforce floors. You buy these and coat with some pvc paint available on Internet. A bit fiddly but really worth the effort. You then place the grill over the pond. The squares are quite large and not very noticable at all. Plants grow through them and they lift off very easily for maintenance. They also stop grandchildren falling in the pond as they can carry quite a lot of weight Which is why I did this. Our local builder was really impressed and said it was the best solution he had ever seen. I have not lost a single fish since and wildlife can still use the pond as usual. If you want any more info please get in touch But this method is tried and tested and really good.
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I had a problem with herons on my pond and cured it very cheaply. At the builders yard they sell large metal grills which go between concrete to reinforce floors. You buy these and coat with some pvc paint available on Internet. A bit fiddly but really worth the effort. You then place the grill over the pond. The squares are quite large and not very noticable at all. Plants grow through them and they lift off very easily for maintenance. They also stop grandchildren falling in the pond as they can carry quite a lot of weight Which is why I did this. Our local builder was really impressed and said it was the best solution he had ever seen. I have not lost a single fish since and wildlife can still use the pond as usual. If you want any more info please get in touch But this method is tried and tested and really good.