Yip they are freshwater mussels
http://www.google.co.uk/images?hl=en...w=1116&bih=775
and you can eat them apparently just make sure theyre clean and not the endangered species
http://www.ehow.co.uk/how_6400375_ea...r-mussels.html
Nice find and get down that slide on a ring and let me know when your going
