[Hodar]

Cant have a dog, as I live alone, and I'm gone flying most of the time.

Then you must do something that will make your pond less attractive. Placing a net is a 'possibility', however I see 2 problems with that.

1). Bird lands on netting, netting sinks, fish pinned between net and pond bottom. Bird simply takes small bites and eats Sushi in small bites

2). Net holds weight of bird, the netting isn't small enough that the bird cannot peck through; fish get eaten in pieces rather can swallowed whole. Or, fish is wounded, dies and floats and is eaten leisurely later.

Alternatively, do something to make your 'feeding station' less attractive to the Herons (they have already learned about the good grazing). Fill bottom of pond with sharp objects, they won't bother the fish, but will cause the heron pain to step on. Alternatively, if the bird has little to no cover; natural paranoia may make the bird feel too exposed to continue hunting.

[Pukin Dog]

Thanks for the advice, everyone. I guess I can see the humor myself.

[DuncanWaring]

Or, fish is wounded, dies and floats and is eaten leisurely later.

What actually happens is "Fish dies, floats, rots, and poisons surviving fish."