Acknowledgements
We would like to acknowledge the support of the LIFE Project ”LIFE+10 NAT/AT/016 - Danube Network” and VERBUND Hydro Power GmbH, which enabled the development and implementation of the near-natural fish bypass system at the Ottensheim-Wilhering Hydro Power Plant. We also extend our thanks to all persons involved in fieldwork (Umweltgutachten Petz), particularly those responsible for fishing, tagging, and monitoring fish migrations. Their commitment was essential to the success of this study.