Fischschutzrechen und Bypässe – ein Überblick aus Deutschland

There are no legally recognized technical requirements for fish protection and downstream fish migration in Germany. However, certain standards have been established, particularly for the use of fish protection screens and bypasses. A screen that blocks the migration corridor towards the turbine without causing damage to the target stages of the target fish species and guides them to bypass inlets due to its angular flow is a fish protection screen.

An overview of various fish protection systems shows that vertical and horizontal inclined screens are currently used the most commonly. Screens with a bar spacing of 10 mm are implemented up to a discharge flow of approx. 50 m³/s.

In addition to the presentation of reliable findings, the article also highlights the gaps in knowledge. Further research and professional exchange are still important to find the best possible solutions and develop innovative approaches.