Hello Sarah. Pond netting i.e. the floating interlocking disc types and fish shelters like lengths of drain pipes, where they can hide away from prying herons are useful.
Cacoethes: An irresistible urge to do something inadvisable
I planted low growing Juniperus squamata Blue Star around my pond. Herons won't step on it as it's spikey and bouncy but they take time to get to a size where they provide enough cover around the edges. I previously used a heron scarer connected to a hose - that did work, but also worked on anyone walking up the garden - which was often amusing
Knowledge is knowing that a tomato is a fruit. Wisdom is not putting it in a fruit salad.
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Otherwise, accept it's part of the natural process of nature, or fit a metal grid over the pond if it's a small one
I previously used a heron scarer connected to a hose - that did work, but also worked on anyone walking up the garden - which was often amusing
Wisdom is not putting it in a fruit salad.