Downstream migration of Atlantic salmon smolt at three German hydropower stations
MetadataShow full item record
- NINA Rapport/NINA Report 
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.
Showing items related by title, author, creator and subject.
RiverPOP 2010. Measurement of trace contaminants in the Glomma River and some recommendations from RiverPOP projects (2008-2011) Allan, I.; Bæk, K.; Kringstad, A.; Bratsberg, E.; Høgfeldt, A.; Ranneklev, S.; Harman, C.; Garmo, Ø. (NIVA-rapport;6126, Research report, 2011)An evaluation of the performance of a range of techniques for the measurement of the concentration of trace level organic contaminants was undertaken in the River Glomma during the period August-November 2010. This work ...
Flommen på Østlandet mai/juni 1995. Effekten på vannkvaliteten i Glomma og Drammenselva. (Flooding of South-Eastern rivers in Norway during spring 1995. Effects on the water quality of river Glomma and river Drammenselva) Holtan, H.; Holtan, G. (NIVA-rapport;3437, Research report, 1996)Rapporten presenterer resultater fra en intensivundersøkelse av vannkvaliteten i Glomma (Sarpsfoss) og Drammenselva (Gamle Mjøndalen bro) i forbindelse med storflommen på Østlandet i mai/juni 1995. For Glomma viser resultatene ...
RiverPOP: Measuring concentrations of persistent organic pollutants and trace metals in Norwegian rivers RiverPOP: Måle konsentrasjoner av persistente organiske forurensende stoffer og metaller i norske elver Allan, I.; Fjeld, E.; Garmo, Ø.; Langford, K.; Kringstad, A.; Bratsberg, E.; Kaste, Ø. (NIVA-rapport;5815, Research report, 2009)A performance evaluation of a range of techniques for the measurement of the concentration of persistent organic pollutants and trace metals was undertaken in the Drammenselva River in 2008. This work focussed on techniques ...