Great info folkKetchup said:On a more culinary note.
on the Breton island of Ouessant (Ushant, for the Pommies), there is since twenty years or so a commercial seaweed farm:
look at http://www.ouessant.com/edible-seaweeds.htm
The link is not working right Ketchup. It's fixed here;
Aquacole d'Ouessant - Edible Seaweeds
One of the key considerations in collecting shellfish and seaweeds is the quality of the water they are collected from. A good place to check is here;
Marine Conservation Society - The Good Beach Guide
Each entry gives an up to date indication of water quality and details of any sewage outlets etc. It's always worth asking locally.