The Upper Rhine forms the border between France and Germany and the two countries have collaborated to create an exceptional resource spanning the river in Gambesheim – Reinau. There is a lock for boat passage, a hydropower plant an extensive educational center explaining how fish can pass upstream and downstream via a ladder and a fish lift – one of the largest in Europe! There is even a large aquarium and underwater viewing gallery which is packed with spectators in April/May when the fish are running up, and again in September when the juveniles come downstream. A perfect site to visit on World Fish Migration Day.
Even on July 14, France’s national holiday, I was warmly greeted by Pierre Zeidler who demonstrated how the interactive fish passage game was played (don’t let the ball drop in the hole!)
Discover one of the biggest fish passages in Europe and enjoy outdoor activities and nature in the region along the Rhine between Strasbourg and Karlsruhe. Information and reservations for guided tours at the fish passage are managed by the crossborder tourist office known as Passage 309. It’s worth a visit!
peddlefree 
What fish did you see?
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This time of year the migratory fish have already gone upstream (April-early June) and juveniles have not come down yet, so I’ve not seen fish, except for two trout just above the Rhine Falls by Schaffhausen. There are fish stoking programs, and I’ve seen references to Seeforellen browns and bachforelle (river trout Salmo trutta).
Most migratory fish stocks declined to extinction in the River Rhine as a result of poor water quality, combined with the construction of barriers and loss of spawning and nursery grounds (Lelek 1989). The construction of dams and enclosures on the rivers from the North Sea, such as Lake Ijssel and Haringvliet-Hollands Diep that have been transformed from brackish to freshwater bodies, have also had an impact on the migratory fish species.
This report has some great information, 30+ species (and an increasing number of non natives)
http://www.fao.org/docrep/007/ad525e/ad525e09.htm
There are significant international cooperative efforts to restore salmon to the Rhine.
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For recreational fishing, the main species targeted are cyprinids such as roach, bream, ide, pikeperch and northern pike.
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