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Fiskars val av passage förbi ett vattenkraftverk där två alternativ finns tillgängliga
Karlstad University, Faculty of Health, Science and Technology (starting 2013).
2015 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Fish route selection past a hydropower plant with two alternative routes available (English)
Abstract [sv]

Många fiskar vandrar mellan olika habitat under sin livscykel. Idag är många vattendrag utbyggda av vattenkraftverk, vars dammar utgöra ett hinder för vandrande fisk. Om det inte finns någon naturlig väg förbi kraftverken kan passagen istället ske genom kraftverkets turbiner där skaderisken är hög. Vid Alsters kraftverk har en fiskpassage anpassad för ål anlagts. Fiskpassagen har två ingångar, en placerad vid ytan och en vid botten. Dessa leder till separata sumpar. Genom att alternera öppningarnas tillgänglighet kunde fem fiskarters djupselektion utvärderas. Detta gjordes genom att (1) båda öppningarna lämnades öppna samtidigt (2) bara ytans ingång var öppen eller (3) endast botteningången var öppen. Resultatet visade att ål selekterade för passage via botten då 70% av alla ålar simmade genom bottenöppningen. Gädda och mört selekterade för ytan och 93% resp. 99% valde passage via ytröret. Abborre och gös selekterade inte för något av djupen då 58% resp. 52% simmade via botteningången. Djupselektionen skilde sig inte mellan situationen då ingångarna var öppna samtidigt eller en åt gången. Med andra ord var samtliga arter inte flexibla i sin djupselektion.

Abstract [en]

Many fish-species migrate between different habitats during their life cycle. Today, many streams have obstacles, such as hydroelectric dams, which act as barriers to migratory fish. If there is no natural way past the power plant the fish may pass via the plant's turbines, where the risk of injury is high. At a power plant in Alsterälven, a fish-pass designed for eels has been built. The fish-pass has two entrances, one located at the surface and one at the bottom, and each entrance led to separate traps. By alternating the availability of openings the depth selection of five fish species could be evaluated. This was done by (1) leaving both entrances open simultaneously (2) leaving only the surface entrance open or (3) leaving only the bottom entrance open. The results showed that eel selected for passage through the bottom, as 70% of all eels swam through the bottom-opening. Pike and roach selected for the surface, with 93%, respectively 99% passing through the surface-opening. Perch and zander did not show any depth preference, as 58%, respectively 52% swam through the bottom opening. For all species, depth selection did not differ between the situations when both entrances were open simultaneously vs one at a time. In other words, the different fish species were not flexible in their depth selection.

Place, publisher, year, edition, pages
2015.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:kau:diva-35052OAI: oai:DiVA.org:kau-35052DiVA: diva2:784365
Supervisors
Examiners
Available from: 2015-02-12 Created: 2015-01-29 Last updated: 2015-02-12Bibliographically approved

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CiteExportLink to record
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