Massive Kormoraneinflüge on the Upper Rhine threatened the complex reconstructed grayling stock:
eingien For weeks, we recorded a massive daily influx Cormorants on the Upper Rhine. In addition to various small groups of cormorants, we get daily attendance of at least one 100 and a flock of about 250 cormorants.
The cold temperatures of recent weeks, driving the birds to our river sections and they are hungry and clever! Despite the highest alert level of cormorant Guard (2 active Patroulienboote with hunters and various Cormorant guards on each club waters), it is possible for the birds to land again and again, unfortunately and to hunt. Especially the peak hours, the dusk of our fish stocks are under serious threat because the cormorants are often noticed it does not. The second picture was taken after a fishing boat had disturbed a large flock.
Numerous dead by pecking big grayling (ü40cm) drove down the Rhine ... How long does the still fragile grayling population of this enormous burden Cormorant was still? 
The massive Kormoraneinflüge threaten again with a lot of heart and blood Fronstunden aufgbauten grayling new stock! How long can the grayling, despite gigantic, voluntary Effort for the cormorant guard protect for? When the work is finally acknowledged by the "Cormorant Friends" and appreciated?
The situation is very serious on the Upper Rhine! We need all the support available to the Cormorant guard, we do not write off the grayling stocks in the Rhine early!
an emotionally affected, but in spite of all combative fish biologist
Samuel Gruendler, December 2010
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