TY  - JOUR
A1  - Havn, Torgeir B.
A1  - Thorstad, Eva B.
A1  - Borcherding, Jost
A1  - Heermann, Lisa
A1  - Teichert, Maxim A. K.
A1  - Ingendahl, Detlev
A1  - Tambets, Meelis
A1  - Sæther, Stein Are
A1  - Økland, Finn
T1  - Impacts of a weir and power station on downstream migrating Atlantic salmon smolts in a German river
Y1  - 2020
VL  - 36
IS  - 5
SP  - 784
EP  - 796
JF  - River Research and Applications
DO  - 10.1002/rra.3590
DO  - 10.23689/fidgeo-4963
N2  - Weirs are barriers built across rivers for a wide range of other purposes than hydropower production. Like hydropower installations, weirs can negatively impact fish migrations. Downstream migration and mortality of Atlantic salmon smolts were studied during passage of a weir and power station by tagging 227 smolts with radio transmitters. Extra loss of smolts due to the weir and adjacent reservoir was 5.2%. Mortality was likely related to physical damage imposed to the smolts and/or increased predation risk. Extra loss of smolts did not differ between the weir and the power station (7.2%). Migration speeds were reduced at the power station but not at the weir. We conclude that mortality at one power station site may differ considerably among years, because the mortality was more than four times higher in a previous year than in this study. Increased river discharge seemed to decrease mortality and increase migration speeds at the power station.
UR  - http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9309
ER  -