I have a net over my fish pond to stop cats eating the goldfish. Should I restock the pond with piranha so the fish could fight back? Could I be sued by the owners of eaten or mutilated cats?

What a great idea!!!! I'm sure that Ray Dart would contribute to your legal fund if you were sued.

If only it was like the cartoons.

What are you going to feed the piranha after all the cats are gone? 

Dear Didge,

I'm sorry, THIS time...I don't believe you...

Piranhas???  Why not...

Are you sure it is cats?  I have a couple of ponds and while occasionally a cat will sit and observe, they have never taken a fish.  OTOH my fish population has been ravaged by raccoon.  And the only thing have found to definitely stop them is depth.  They won't swim for fish, but if they can wade,they will go for the fish, uproot your lilies, shred all the other plants, and then probably take a dump on your lawn to show their appreciation. 

No No No. Here is my idea. No one gets hurt. The cats will leave well enough alone. The goldfish will feel empowered, and you won't have to spend money on piranhas. You MUST think outside the box......

Crocodiles aren't an invasive species, and they camouflage pretty well.

Place ray dart in the pond

If the cat is mutilated just throw his ugly butt in the pond of piranhas. Done.

You do realize that you won't have ANY goldfish .. Replacing one predator with another is pointless .. you big ol'meanie!