Mika and Zuzu at least you don't have bears fishing in your ponds
A couple of years ago a friend of mine had a bear virtually move onto her property because he loved her pond, her berries and her vegetable garden.
She had given up on bird netting for the pond when a young eagle had gotten tangled up in it, so, she too had problems with herons and other birds, but it was the bear that really upset her the most.
Zuzu, of all of those remedies, I have found the aloe vera works the best.