Cats terrorise my fish!

I've recently moved into my new house which has a lovely little pond i
the garden - home to 3 goldfish.

The water was so murky that you couldn't see the fish, so I called
guy from a local aquarium company who came out to clean the pond an
install a saftey grating (I have a 2 year old child). He also attache
meshing to the grate to 'keep the cats from getting the fish'.

It hasn't worked! The fish have been terrorised by numerous cats and
of the poor buggers have somehow been dragged out and left to die. Th
remaining goldfish is in a right state, his fins are torn and he ha
claw marks all over him.

How do I keep the cats away - my neighbour recommends trellis along al
walls and nails on the gate, has anyone tried this or do you have an
other ideas.

Thank
-
Scooby Don'
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