The Brandifrout river

Almost 14 km long, the river Brandifrout is a tributary of the Blavet. Lined with sand eroded from the granite bedrock by the water, this well oxygenated river is home to salmon and trout, but also to a very rare shellfish, the freshwater pearl mussel. Living up to one hundred years, this freshwater mussel is under threat by pollution and dams as it needs nitrate-poor waters and Salmonidae to ensure the species survives. The larvae laid by the females stick to the gills of the fish, forming a cyst from which a small mussel hatches.