....at migrationsobstacles is a very important instrument to proof the migrationactivities and chances for the waterorganism. Both upstream and downstream migration should be examined. Only examination leads to validation and thus proposals for improvements may be derived from the results.
.Functionscontrol on the
maeanderfishway in Drakenburg/Weser in (April 2002)
At the rivers Aller, Oker und Schunter
ther have been done some function controls at Hedwigsburg, Rueningen,
Rothemuehle, Meinersen and Mueden. Furthermore there is a planning for a
permanent controll- and
informationstation in Meinersen at the river Oker .
In the sense of a real rivermanagement there should be scientific function
controls from the estuary to the upper reaches of the rivers on upward and
downward movements. The hope about riversections to be passed by the fishes
should be replaced by the knowledge of examinations.
Devices behind downstream fishways and powerstations may deliver essential argumentationbase. And both functionanalysis and damage statements can be made by using such devices.