To build up self-sustaining stocks of salmon, access must be restored to a maximum number of identified spawning and juvenile habitats in the Rhine catchment, and greater facility for upstream migration allowed. Activities to support this include work on two dams in the Upper Rhine at Strasbourg and Gerstheim by 2015 to allow access to the Elz-Dreisam system in the Black Forest, improving existing fish passages at four dams on the High Rhine and at several barriers on the navigable tributaries that are the Moselle, Main, Lahn and Neckar. Such measures arc also a feature of responses in the Moselle and Saar and in the Scheldt.