Universität zu Köln

Havn, Torgeir B., Thorstad, Eva B., Borcherding, Jost, Heermann, Lisa, Teichert, Maxim A. K., Ingendahl, Detlev, Tambets, Meelis, Saether, Stein Are and Okland, Finn (2020). Impacts of a weir and power station on downstream migrating Atlantic salmon smolts in a German river. River Res. Appl., 36 (5). S. 784 - 797. HOBOKEN: WILEY. ISSN 1535-1467

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Abstract

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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Havn, Torgeir B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Thorstad, Eva B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Borcherding, Jost UNSPECIFIED UNSPECIFIED UNSPECIFIED Heermann, Lisa UNSPECIFIED UNSPECIFIED UNSPECIFIED Teichert, Maxim A. K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ingendahl, Detlev UNSPECIFIED UNSPECIFIED UNSPECIFIED Tambets, Meelis UNSPECIFIED UNSPECIFIED UNSPECIFIED Saether, Stein Are UNSPECIFIED UNSPECIFIED UNSPECIFIED Okland, Finn UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-331813
DOI:	10.1002/rra.3590
Journal or Publication Title:	River Res. Appl.
Volume:	36
Number:	5
Page Range:	S. 784 - 797
Date:	2020
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1535-1467
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SALAR L. SMOLTS; TRUTTA L.; MARINE SURVIVAL; RHINE RIVER; MORTALITY; PASSAGE; REINTRODUCTION; BEHAVIOR; BARRIER Multiple languages Environmental Sciences; Water Resources Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/33181