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Evaluating technical improvements for downstream migrating diadromous fish at a hydroelectric plant
Karlstad University, Faculty of Social and Life Sciences, Department of Biology. (Naturresurs rinnande vatten)
School of Civil Engineering & Environment, University of Southampton.
Fiskevårdsteknik AB, Pålsjövägen 12, S-223 62 Lund, Sverige.
DITAG—Land, Environment and Geo-Engineering Department, Politecnico di Torino, Italy.
2012 (English)In: Ecological Engineering - The Journal of Ecosystem Restoration, ISSN 0925-8574, Vol. 48, 30-37 p.Article in journal (Refereed) Published
Abstract [en]

Technical improvements to ameliorate downstream passage for diadromous fish have rarely been eval-uated in regulated rivers in northern Europe. The current study evaluated rehabilitative measures for downstream migrating Atlantic salmon, brown trout and European eel at a hydroelectric plant in south-ern Sweden. Smolts (

N= 66), kelts (N= 20) and silver eels (N= 55) were caught, radio-tagged and tracked whilst passing the facilities in spring (salmonids) and fall (eels) of 2007. A surface gate in combination with a 90 mm-spaced turbine intake rack had a fish guidance efficiency ranging from no effect for eels and trout smolts to 50% for trout kelts. A siphon discharging water from the bottom of the same 90 mm rack did not bypass any tagged fish, and only a few untagged eels. The poor function of the measures was attributed to the failure of the rack to stop smolts and eels from entering the turbines. The kelts, on the other hand, could not pass through the rack, and instead took a long time to locate the surface bypass entrance. The conditions for downstream migrating fish have improved at the hydroelectric plant, but the total losses remain quite high for the studied groups (10–67%), and there is a need for a new rehabilitative measure that effectively allows all fish to bypass the turbines.

Place, publisher, year, edition, pages
Elsevier, 2012. Vol. 48, 30-37 p.
Keyword [en]
Fish guidance efficiency, Surface bypass, Siphon, European eel, Anadromous trout, Atlantic salmon
National Category
Other Biological Topics
Research subject
Biology
Identifiers
URN: urn:nbn:se:kau:diva-12748DOI: 10.1016/j.ecoleng.2011.05.002ISI: 000313385300005OAI: oai:DiVA.org:kau-12748DiVA: diva2:513630
Projects
HertingprojektetÅlprojekt Ätran
Available from: 2012-04-03 Created: 2012-04-03 Last updated: 2012-11-21Bibliographically approved

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Publisher's full texthttp://www.sciencedirect.com/science/article/pii/S0925857411001510

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CiteExportLink to record
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