Session C9: HDX-Monitoring in the Wupper, a Study of Fish-Migration
Location
Groningen, The Netherlands
Event Website
http://fishpassage.umass.edu/
Start Date
24-6-2015 4:00 PM
End Date
24-6-2015 4:15 PM
Description
Abstract:
The river Wupper is one of the prioritywaters catchment areas for anadromous and potamodromous fish in the German federal state North Rhine-Westfalia. The survey took place at a small hydropower facility named “Auer Kotten” and its different fish ways and protection facilities, like a vertical slot fish pass and a natural like rockpool channel, three different bypass types and a 12 mm-horizontal screen. Sixteen HDX-antennas were installed by Institute of Applied Ecology to identify the preferred migration routes of transponder tagged fish several species. An HDX-Antenna works like an electrified coil, which creates an electro magnetic field trough to the antenna. So tagged fish enter the antenna the transponder is activated and emits an individual code, which is registered by the antenna and archived by data logger time-, location- and individual-precise. In autumn 2013 nearly three-hundred silver eels were tagged intraabdominal with transponders and released upstream the hydropower plant in the Wupper. Additionally 999 smolts of Atlantic salmon were released in spring 2014. The preferred migration corridors as well as the time for passing the different facilities could be identified by a redetection of 77 % of the silver eel and 68 % of the salmon smolts. As one of the results it was shown that neither the two surface bypasses, nor the bottom bypass were used properly by the downstream migrating fish. In opposite the vertical slot fish pass and a episodically working gate next to the trash rack screen, to send debris into the trailwater were often passed, sometimes maybe forced. Moreover wild fish of different species were caught ca. 20 km downstream the “Auer Kotten” by electro-fishing, tagged and released to get information about the preferred upstream migration routes. Most of the so far redetected fish arrived in the trailwater of the turbine outlet, while just lamprey preferred to swim into the original river bed. The results of the survey points out that the HDX-technology is perfect for field studies on the migratory behaviour of fish, even an intensive maintenance is needed f. e. to protect the installations for demages caused by high floods.
Session C9: HDX-Monitoring in the Wupper, a Study of Fish-Migration
Groningen, The Netherlands
Abstract:
The river Wupper is one of the prioritywaters catchment areas for anadromous and potamodromous fish in the German federal state North Rhine-Westfalia. The survey took place at a small hydropower facility named “Auer Kotten” and its different fish ways and protection facilities, like a vertical slot fish pass and a natural like rockpool channel, three different bypass types and a 12 mm-horizontal screen. Sixteen HDX-antennas were installed by Institute of Applied Ecology to identify the preferred migration routes of transponder tagged fish several species. An HDX-Antenna works like an electrified coil, which creates an electro magnetic field trough to the antenna. So tagged fish enter the antenna the transponder is activated and emits an individual code, which is registered by the antenna and archived by data logger time-, location- and individual-precise. In autumn 2013 nearly three-hundred silver eels were tagged intraabdominal with transponders and released upstream the hydropower plant in the Wupper. Additionally 999 smolts of Atlantic salmon were released in spring 2014. The preferred migration corridors as well as the time for passing the different facilities could be identified by a redetection of 77 % of the silver eel and 68 % of the salmon smolts. As one of the results it was shown that neither the two surface bypasses, nor the bottom bypass were used properly by the downstream migrating fish. In opposite the vertical slot fish pass and a episodically working gate next to the trash rack screen, to send debris into the trailwater were often passed, sometimes maybe forced. Moreover wild fish of different species were caught ca. 20 km downstream the “Auer Kotten” by electro-fishing, tagged and released to get information about the preferred upstream migration routes. Most of the so far redetected fish arrived in the trailwater of the turbine outlet, while just lamprey preferred to swim into the original river bed. The results of the survey points out that the HDX-technology is perfect for field studies on the migratory behaviour of fish, even an intensive maintenance is needed f. e. to protect the installations for demages caused by high floods.
https://scholarworks.umass.edu/fishpassage_conference/2015/June24/37