The 4 solutions we are considering involve different technologies . The first consists in predicting the periods during which fish migrate downstream . This involves a new strategy for the operation of hydroelectric dams, taking into account the migration intensity of fish . The second solution consists in the installation of repellent screens guiding the fish migration to the adequate channels . The third solution is the installation of a migration outlet and the fourth and last solution, which is not included in the scope of the Life programme but is intrinsically linked to our project, is the installation of a new type of turbine, a so-called environmentally sustainable turbine . This turbine should enable us to further reduce our impact on fish fauna without jeopardising our energy production.