Pesky Predators

[Waterfins]

I've been having this problem for a while with predators waltzing into my pond and snatching up my fish, it's honestly heartbreaking to wake up the next morning with dead fish corpses covered in flies on your lawn. I usually get ransacked by racoons, neighbourhood cats, foxes and even a freaking great blue heron. Does anyone here know anyways I can prevent this from constantly occurring?

 

[FroFro]

Perhaps cover the pond with a screen of some sort at night? Maybe something like the materials they use for window screens like a mesh?