Luxembourg is a true angler’s paradise thanks to its river waters and lakes. Trout, pike, pike-perch, eel, carp and many other fish species are found in Luxembourg waters.
In the border waters between the Grand Duchy Luxembourg and the Länder Rhineland-Palatinate and Saarland of the Federal Republic of Germany, fishing is possible without a fishing licence. All you have to do is buy a permit. Permits for border waters can be obtained by persons over 14 years of age.
More information under: https://www.visitluxembourg.com/en/place/watersports/fishing-on-inland-rivers