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Downstream migration of Atlantic salmon smolt at three German hydropower stations

Økland, Finn; Teichert, Maxim A.K.; Thorstad, Eva B.; Havn, Torgeir B.; Heermann, Lisa; Sæther, Stein Are; Diserud, Ola H.; Tambets, Meelis; Hedger, Richard D.; Borcherding, Jost
Research report
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URI
http://hdl.handle.net/11250/2412774
Date
2016-10-04
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  • NINA Rapport/NINA Report [1818]
Abstract
Økland, F., Teichert, M.A.K., Thorstad, E.B., Havn, T.B., Heermann, L., Sæther, S.A.,

Diserud, O.H., Tambets, M., Hedger, R.D. & Borcherding, J. 2016. Downstream migration

of Atlantic salmon smolt at three German hydropower stations. NINA Report 1203: 1-47.

The aim of this study was to examine migration routes and losses of Atlantic salmon smolt

past three hydropower stations, which were the Unkelmühle (River Sieg), Gengenbach

(River Kinzig), and Kuhlemühle (River Diemel) power stations. These three power stations

represent the use of different technologies to reduce negative impact on downstream migrating

fish. The study was performed by tagging 525 Atlantic salmon smolt with radio

transmitters and recording their migration when passing the power stations.

In 2015, the loss of downstream migrating smolt due to the power station was 12.8% at

Unkelmühle and 3.1-6.3% at the power station in Gengenbach. This represents the percentage

of smolt entering the power station area that were lost due to this being a power

station instead of a free-flowing river. Immediate mortality for smolt that passed through

the Archimedes screw turbine at Kuhlemühle was estimated at 0-8%.

Results showed that also reservoirs upstream of power stations can be areas of high mortality.

Of smolt entering the reservoir upstream of Unkelmühle, 7.2% and 17.1% (two study

years) were lost due to this being a reservoir instead of a free-flowing river. The main reason

was likely presence of more fish predators (i.e., larger fishes eating smolt) in the slowflowing

reservoir compared to the free-flowing river stretches.
Series
NINA Rapport;1203

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