Universität zu Köln

Havn, Torgeir B., Thorstad, Eva B., Teichert, Maxim A. K., Sther, Stein A., Heermann, Lisa, Hedger, Richard D., Tambets, Meelis, Diserud, Ola H., Borcherding, Jost ORCID: 0000-0003-3411-5861 and Okland, Finn (2018). Hydropower-related mortality and behaviour of Atlantic salmon smolts in the River Sieg, a German tributary to the Rhine. Hydrobiologia, 805 (1). S. 273 - 291. DORDRECHT: SPRINGER. ISSN 1573-5117

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Abstract

We studied downstream migration of 256 radio-tagged Atlantic salmon smolts passing a low-head power station where technical facilities have been improved to allow safe migration via several bypass routes. Extra mortality was 7 and 17% (two years) in the power station reservoir, and a minimum of 10 and 13% at the power station compared to in a control stretch. The majority of the smolts followed the main flow at the power station, towards the turbines. Sloped bar racks with 10 mm bar spacing hindered smolts from entering the turbines, hence there was no turbine mortality. Smolts used surface openings in the racks, which directed them to a bypass route outside the turbines. The extra mortality in the reservoir and at the power station was related to physical injuries in bypass routes and to predation. The mortality risk in the reservoir and at the power station decreased with increasing migration speed. Migration speeds increased with water discharge. Migration was slower when the smolts passed the power station than on other stretches. This study shows that hydropower regulation caused elevated mortality and delays for downstream migrating fish, even with improved technical facilities to reduce mortality.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Havn, Torgeir B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Thorstad, Eva B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Teichert, Maxim A. K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sther, Stein A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Heermann, Lisa UNSPECIFIED UNSPECIFIED UNSPECIFIED Hedger, Richard D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tambets, Meelis UNSPECIFIED UNSPECIFIED UNSPECIFIED Diserud, Ola H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Borcherding, Jost UNSPECIFIED orcid.org/0000-0003-3411-5861 UNSPECIFIED Okland, Finn UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-200493
DOI:	10.1007/s10750-017-3311-3
Journal or Publication Title:	Hydrobiologia
Volume:	805
Number:	1
Page Range:	S. 273 - 291
Date:	2018
Publisher:	SPRINGER
Place of Publication:	DORDRECHT
ISSN:	1573-5117
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SALAR L. SMOLTS; DOWNSTREAM MIGRATION; MARINE SURVIVAL; POST-SMOLTS; TEMPERATURE; REINTRODUCTION; MOVEMENT; WILD Multiple languages Marine & Freshwater Biology Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/20049