Oh no....

I would suggest checking out pond design ideas to lower the risk of predators to your fish/pond. I can't name them off hand anymore.
 
Put one of those cattle electric fences around the pond :devil:

Grounding the fence in the pond is not a smart thing to do by the way
 
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Unless you're using rolls of it bordering the pond, prison-camp style, a few rows of barbed wire may not be sufficient.
 
Cougar urine, an electric fence, and a .22 should take care of your problem.

Alternatively, the cover's a good idea. You can't make anything fail safe, but you can make sure it can fail well.

'Coons are annoying little buggers with opposable thumbs. Never underestimate them.
 
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