Seeing that took me back down memory lane, I spent a two week fishing Holiday on the River Weser about 25 years ago in what was then West Germany at a place called Nienberg. I caught a few catfish then but nothing above 5lb, crikey they've grown!
Its a river similar to the middle trent, stuffed with Bream, barbel, Roach, Ahlend, some carp etc.
I had 100lb plus bags almost every day, including 83 roach for 115lb.
A lot of British Soldiers used to fish it, from bases like Bielfeld and Nienberg.
Looks like a new venue for the Catfish boys!