This schema shows the three functions of a fish protection system: blocking, guiding, transferring. A screen with the function of a fish protection screen always forms a functional unit with the mandatory bypass as an alternative downstream migration corridor in the fish protection system. Separately and isolated from each other, both components are usually ineffective. Screens and bypasses must be closely harmonized with each other. An effective fish protection system must fulfill three basic functions:

• Blocking: Prevent fish from entering the turbine
• Guiding: Cause fish to swim along the screen toward a non-hazardous downstream migration corridor
• Transferring: Provide an attractive, non-hazardous downstream migration corridor and harmless transfer of fish to tailwater.

The infographic is part of the fact sheet "What makes a screen to a fish protection screen? The functional components of a fish protection system."

The infographic is published under a creative commons license CC BY 4.0. That means it can be copied and redistributed in any medium or format and for any purpose as long as appropriate credit to the authors (Ecologic Institute, Institute of Aquatic Ecology and Fish Biology, IGF Jena) is given.