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alevins alluvial areas Alsace barrage weirs Basel biotopes birds Brol century cut-off meanders downstream Eaux et Foréts ecological improvements eggs equipped with ﬁsh European examined expenditures Father Rhine fiir Fischerei NRW ﬁrst Fish ﬁsh fauna ﬁsh ladder ﬁsh migration ﬁsh passages ﬁshermen ﬂowing Fuß Gambsheim genetic gravel habitats hatched High Rhine home river hydraulic power ICPR contracting party IJssel industrial inﬂuence intemational juvenile salmon KARL SIMROCK Koblenz Lahn Lahnstein Landbouw lffezheim Loreley Lower Rhine Luxembourg Meuse migrate upstream Ministerium Natuurbeheer Netherlands Northrhine-Westphalia Number of salmon oxygen parent river passages in order pollution programme reproduction Restoring the stock retum Rhein Rhine ecosystem Rhine salmon Rhine tributaries Rhine water Rhineland-Palatinate Rivers Rhine salmon and sea salmon caught Schweizerhalle sea eagle sea trout smolt southwest of France spawning and nursery spawning grounds spawning period stock of salmon Strasbourg surveillance treaty upper reaches Upper Rhine Wasser wastewater yolk sac