The objective of the operation is to restore fish franchisability in the Lower Durance, in particular for Mediterranean Feigned Alose and European Eel (highly migratory species), by carrying out work on fishways on three thresholds managed by the SMAVD: thresholds 68, 67 and 66. These developments should make it possible to open 40 km of river to the migration of the Aloses to the dam of Mallemort, improve the franchisability of the Eel to Cadarache (100km), and decompartmentalize the environments for local migrants. In addition to carrying out the work itself, the operation presented to the ERDF funds aims to monitor the efficiency of the fish farming facilities built and environmental monitoring after work.