The effect of periodic shutdowns of the generating station on the downstream migration of adult American Shad are assessed. The study also aims at assessing a sound barrier on shad behavior. The barrier is installed yearly and the accoustic echoes from scanning sonars are used to calculate an abundance index.

MILIEU worked with the Institut de Recherche d'Hydro-Québec to investigate whether downstream migrating American Shads can be guided away from the Des Prairies River entrance. The use of alternative ways allows the shads to bypass the hydroelectric facility downstream and thus increase survival rates.