Thanks for the info macka and blott.The reason i asked is because the last time i was in orlando about 8 years ago i called into a shop to buy some reels to bring home and the assistant showed me a photo of one of his friends that had what i thought was common carp upto about 20lb in weight that he had killed with his crossbow.I was taken aback and shocked by the number of fish in the photo and didn't ask him if anybody actually fished for them or were they just hunted like vermin.
I will make some enquiries when i am over there.

Gaz