Hi Dav, Not entirely sure. I think that once you get into 20 foot of water you dont see much kelp, so I would say it only grows in water from 10-20 foot deep. Thats just a theory of mine but you dont see much kelp in shallow water and you dont see much in this part of the world in deeper water. It will be nice to see you down here again Dav when the big pollack come out to play. Im sure one of us will get the double figure fish this year, they are in there I am sure of it. I also believe that the area to the north side of Runswick will be as good if not better. Its just a matter of sussing it out.