Open Access
Fig. 1

Download original image
The course of the River Lahn and its obstacles impeding fish migration. Stocking sites of Chondrostoma nasus in the years 1995–1997 and 2014–2015 were located between the upper course (near Kernbach) and the middle course (near Steeden) of the River Lahn.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.