Funding for this research was provided by:
Grantová Agentura České Republiky (13-05872S, P505/12/G112)
Article History
Received: 17 July 2017
Accepted: 20 June 2018
First Online: 4 July 2018
Ethics approval and consent to participate
: Collection of samples adhered to the legal requirements of the Czech Republic, Poland, Germany and Italy. Samples from the Czech Republic were collected under permit No. 59/2007, issued by Ministry of Agriculture, and was approved by Ethical Committee of the Institute of Vertebrate Biology (ref. 163–12). Sampling in Germany, Italy and Poland was performed under collection permits and ethics approval issued to our collaborators. In Poland, approval was issued by the Ethic Committee of University of Łódź no. Ł/BD/309/2006 and collection permit (10/2002) granted M. Przybylski (University of Łódź). In Germany, sampling was approved by the ethical commission of the University of Cologne and by Rheinfischereigenossenschaft NRW, Deichverband Bislich-Landesgrenze (J. Borcherding). In Italy, ethical and sampling approval was issued by University of Milano (P. Galli). No fish was killed for the purpose of this study - sampling was performed by clipping a small piece of caudal fin that has rapid regenerating capability.
: Not applicable.
: The authors declare that they have no competing interests.
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