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Icke-fysiska fiskledare: En laborationsstudie för att utvärdera tre fiskledare av bubblor och strobeljus och deras funktion i att leda laxsmolt vid nedströmsvandring
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2017 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Non-physical fish guidance methods : A laboratory study evaluating three different fish guiding methods in their efficiency in guiding smolt of Atlantic Salmon (Salmo salar L.) (English)
Abstract [sv]

Fiskars passager genom vattenkraftverk är förenat med hög dödlighet. För att minska vattenkraftens påverkan på fiskbestånd har olika fiskledare utvecklats. I denna laboratoriestudie utvärderades tre typer av icke-fysiska fiskledare och deras effektivitet i att leda odlade smolt av Atlantlax (Salmo salar L.) till en önskad passage. Målet med denna studie var att undersöka om det var möjligt att leda odlade laxsmolt till en önskad passage med hjälp av bubblor, strobeljus eller en kombination av bubblor och strobeljus. Med relativt enkla medel och låg kostnad konstruerades fiskledare som bestod av en perforerad slang driven av en luftkompressor samt en ljusramp med fyra LED-lampor vilka blinkade simultant med 480 bpm. Fem replikat genomfördes för vardera behandling, bubblor, strobeljus och bubblor/strobeljus, samt sex replikat i kontrollen. Under en timmes behandling fick tio laxsmolt, märkta med PIT-tag, passera en av två antenner, varav den ena var utrustad med en fiskledare, under vandring i nedströms riktning i ett strömakvarium. Denna studie visade att fiskledare av samtliga tre metoder ledde smolt till en önskad passage under behandlingens första femton minuter. Vidare visade fiskledaren bestående av bubblor en fortsatt ledande förmåga över hela behandlingsperioden (60 minuter), medan fiskledarna av strobeljus- och bubbel/strobeljus inte visade en sådan effekt.

Abstract [en]

Passages by fish through hydropower plants are associated with high mortality. In order to reduce the impact of hydropower plants on fish stocks, a variety of fish guiding systems have evolved. In this laboratory study, three types of non-physical fish guiding systems were evaluated by their efficiency in leading cultivated smolt of Atlantic salmon (Salmo salar L.) to a desired passage. This study aimed to answer if it is possible to guide salmon smolt to a desired safe passage by using bubbles, strobe light or a combination of bubbles and strobe light. With relatively simple means and low cost, fish-guides were constructed consisting of a perforated tube driven by an air compressor and a light ramp with four LED lights, which simultaneously flashed at 480 bpm. Five replicates were performed for each treatment; bubbles, strobe light and bubbles / strobe light, as well as six replicates for the controls. During one hour of treatment, ten salmon smolt, marked with PIT tag, could pass one of two antennas, where one had a fish-guide in front of the antenna, while migrating downstream in a stream aquarium. This study showed that fish-guides of all three methods led smolt to a desired passage during the first fifteen minutes of treatment. Furthermore, the bubble method showed a continuous guiding capacity throughout the treatment period (60 minutes), while the strobe light and bubble/strobe light did not show such an effect.

Place, publisher, year, edition, pages
2017.
Keywords [en]
Fish guiding, Atlantic salmon, Salmo salar L., smolt, barrier, air, bubbles, strobe light, safe passage, population conservation
Keywords [sv]
Fiskledare, Atlantlax, Salmo salar L., smolt, barriär, luft, bubblor, strobeljus, omlöp, bevarande ekologi
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:umu:diva-140407OAI: oai:DiVA.org:umu-140407DiVA, id: diva2:1148175
Educational program
Bachelor of Science in Biology and Earthscience
Supervisors
Examiners
Available from: 2018-10-09 Created: 2017-10-10 Last updated: 2018-10-09Bibliographically approved

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Citation style
  • apa
  • ieee
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  • Other style
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  • de-DE
  • en-GB
  • en-US
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  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
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  • text
  • asciidoc
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