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.