Hi..

Someone has suggested grass carp for the duckweed problem
on one of our
ponds.

Hm.., personally I've never had any grass carps but
goldfish, and goldfish are well known to eat duckweed..

Remember my aquariums and summer pond with goldfish without
any duckweed probs..

How big is the pond, how is it stocked and how is it
planted..?

But the general impression I get from the little I
read is that they grow to enormous sizes, are lake fish
and are banned in US because they
devastate lake vegetation.

Right..

Does anyone here have any
experience of these in UK and ponds, not lakes?

Me..? For heaven's sake - never..! :-)

--
cu
Marco, shivering..