Fishes - Isar

Dear Friends
I have always estimated that the river Isar, crossing Munich, was sufficiently polluted for discouraging fishes to reside in it. Many times I looked for them in the water unsuccessfully. But the presence of fishermen in the river and the suggestion of my cousin Omero, experienced fisherman, "they don't go to fish where there is no fishes" prompted me to look more carefully in the waters. As you can see from the images, also in this case, the reality surpasses any pragmatic or reasonable prediction, although the fishes remain to be identified.
Salutations
Giancarlo