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"Fallbacks" - betydelsen av vandringstid för Atlantlax (Salmo salar L.) som faller nedströms vandringshinder
Karlstad University, Faculty of Health, Science and Technology (starting 2013).
2013 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
"Fallbacks" - the importance of migration time for Atlantic salmon (Salmo salar L.) that fall downstream of migration barriers (English)
Abstract [en]

In Lake Vänern, Sweden, there is an endemic population of Atlantic salmon (Salmo salar L.) that lives its entire life in fresh water. The salmon is hindered from migrating to its natural spawning sites in the northern part of the River Klarälven by nine hydro-electric power plants. None of the hydro-electric power plants have fishways so that salmon migrating upstream or downstream may pass. In the current situation, the upward migrating salmon are caught in a fish trap at the most downstream located power plant in Forshaga. From there, the salmon are driven in a truck, past eight power plants and released a few kilometers upstream of the eighth power plant at Edsforsen. This study investigated the difference in the proportion of fallbacks between early (June-July) and late (August-September) migrating salmons in 2011-2013. The results showed that there was a significant difference in the proportion of fallbacks between the early and the late-migrating salmon. Fifty-one percent of the early salmon and 13% of the late salmon fell back during these 3 years. Further, there was no significant difference between males and females that became fallbacks. Nor was there any difference in the length of early and late-migrating salmon or fallbacks and non-fallbacks.

Abstract [sv]

I sjön Vänern, Sverige, finns en endemisk population av Atlantlax (Salmo salar L.) som lever hela sitt liv i sötvatten. Laxen hindras från att migrera till sina naturliga lekplatser i norra delen av Klarälven av nio vattenkraftverk. Inget av vattenkraftverken har fiskvägar så att lax som migrerar uppströms eller nedströms kan passera. I dagsläget fångas lax som vandrar uppströms in i en fiskfälla vid det mest nedströms belägna kraftverket i Forshaga. Därifrån körs laxen i lastbil förbi åtta kraftverk och släpps ut några kilometer uppströms det åttonde kraftverket i Edsforsen. Den här studien undersökte skillnaden i andelen fallbacks mellan tidigt (juni-juli) och sent (augusti-september) migrerande laxar under åren 2011-2013. Resultaten visade att det fanns en signifikant skillnad i andelen fallbacks mellan den tidiga och den sent migrerande laxen. Femtioen procent av den tidiga laxen och 13% av den sena laxen föll tillbaka under dessa 3 år. Vidare fanns det ingen signifikant skillnad mellan hanar och honor som blev fallbacks. Det fanns inte heller någon skillnad i längden av tidigt och sent migrerande lax eller lax som föll tillbaka och lax som inte föll tillbaka.

Place, publisher, year, edition, pages
2013. , 14 p.
Keyword [en]
Fallback, Atlantic salmon, salmon, Salmo salar, power plant, Klarälven, Vänern, migration barrier, migration
Keyword [sv]
Fallback, Atlantlax, lax, Salmo salar, kraftverk, Klarälven, Vänern, vandringshinder, vandring
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:kau:diva-30583OAI: oai:DiVA.org:kau-30583DiVA: diva2:670471
Subject / course
Biology
Educational program
Biology programme, 180 hp
Supervisors
Examiners
Available from: 2014-04-30 Created: 2013-12-03 Last updated: 2014-04-30Bibliographically approved

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"Fallbacks" - betydelsen av vandringstid för Atlantlax (Salmo salar L.) som faller nedströms vandringshinder(410 kB)305 downloads
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  • apa
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Output format
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