I've seen metal grids work very well at keeping herons out of a pond.
I used to be at this community garden renting land for farming. There was a goldfish pond near . One day a heron came and ate all or most of their goldfish.
They covered the whole pond with a metal grid qnd no more pesty heron.
I used to be at this community garden renting land for farming. There was a goldfish pond near . One day a heron came and ate all or most of their goldfish.
They covered the whole pond with a metal grid qnd no more pesty heron.