Funding for this research was provided by:
Umweltbundesamt (FKZ 3715 22 200 0)
Text and Data Mining valid from 2020-02-07
Received: 7 November 2019
Accepted: 22 January 2020
First Online: 7 February 2020
Ethics approval and consent to participate
: Sampling and killing of wild fish were performed by federal state authorities or authorized fishermen by applying approved methods.
: Not applicable.
: The authors declare that they have no competing interests.