The key messages of Fact Sheet No. 05 are:

• A fish protection system must provide three functions: Blocking, guiding and transferring.
• Fish protection screens and bypasses form a functional unit in fish protection systems. Screens without bypasses or bypasses without a suitable screen do not constitute a protection system.
• Horizontally angled fish protection screens guide fish across the entire water column to the bypass. The fish can remain in their natural swimming horizon.
• Vertically angled fish protection screens can guide fish to bypass inlets or collection devices near the surface across the entire width of the turbine inlet.

The fact sheet "What makes a screen to a fish protection screen?" [1] is available for download.