The German edition, Stromaufwärts: Das bewegte Leben eines Amazonasvolks (Konstanz University Press), can be purchased here.

A review appeared in the Frankfurter Allgemeine Zeitung on 18 December 2015.  (PDF copy here: faz_review_reduced.)  My German-speaking friends tell me that it’s favorable.  It contains a factual error, however:  Evaristo Nugkuag does not serve as a member of the Peruvian parliament; it’s Eduardo Nayap as stated in the book.