Blar i NTNU Open på forfatter "Gjelland, Karl Øystein"

Viser treff 1-6 av 6

    • Can Energy Depletion of Wild Atlantic Salmon Kelts Negotiating Hydropower Facilities Lead to Reduced Survival? 

      Baktoft, Henrik; Gjelland, Karl Øystein; Szabo-Meszaros, Marcell; Silva, Ana T.; Riha, Milan; Økland, Finn; Alfredsen, Knut; Forseth, Torbjørn (Peer reviewed; Journal article, 2020)
      Repeat spawners constitute an important component of Atlantic salmon populations, but survival of post-spawning individuals (kelts) are often compromised by anthropogenic structures such as hydropower plants (HPPs). Potential ...

    • Fiskesamfunnet i Osensjøen, Trysil og Åmot kommuner Hedmark. Status i 2013 og endringer siden 1970-åra. 

      Sandlund, Odd Terje; Linløkken, Arne; Gjelland, Karl Øystein; Johnsen, Stein Ivar; Rognerud, Sigurd; Museth, Jon; Dokk, John Gunnar; Garmo, Øyvind Aaberg; Walseng, Bjørn (NINA rapport;1046, Research report, 2014)
      Målsetningen for undersøkelsene i Osensjøen i 2013 var å fastslå status for fiskebestandene mer enn 30 år etter åpningen av Osa kraftverk i 1981. Mer spesifikt skulle vi også vurdere mulige effekter av planlagte endringer ...

    • Modelling mitigation measures for smolt migration at dammed river sections 

      Szabo-Meszaros, Marcell; Forseth, Torbjørn; Baktoft, Henrik; Fjeldstad, Hans-Petter; Silva, Ana T.; Gjelland, Karl Øystein; Økland, Finn; Uglem, Ingebrigt; Alfredsen, Knut (Journal article; Peer reviewed, 2019)
      There is no generic solution to establish safe passage of downstream migrating fish passed hydropower facilities and mitigation measures are species‐ and site‐specific. Development of solutions is thus often based on “trial ...

    • Three-dimensional migratory behaviour of European silver eels (Anguilla anguilla) approaching a hydropower plant 

      Kjærås, Halvor; Baktoft, Henrik; Silva, Ana T.; Gjelland, Karl Øystein; Økland, Finn; Forseth, Torbjørn; Szabo-Meszaros, Marcell; Calles, Olle (Peer reviewed; Journal article, 2022)
      Three-dimensional migratory behaviour of European silver eels (Anguilla anguilla) approaching a hydropower plant facilities to accomodate downstream eel migration. The results of this recommendation are poorly studied, and ...

    • Timing is everything: Survival of Atlantic salmon Salmo salar postsmolts during events of high salmon lice densities 

      Bøhn, Thomas; Gjelland, Karl Øystein; Serra Llinares, Rosa Maria; Finstad, Bengt; Primicerio, Raul; Nilsen, Rune; Karlsen, Ørjan; Sandvik, Anne Dagrun; Skilbrei, Ove Tommy; Elvik, Kristine Marit Schrøder; Skaala, Øystein; Bjørn, Pål Arne (Peer reviewed; Journal article, 2020)
      Atlantic salmon in aquaculture act as reservoir hosts and vectors of parasites like salmon lice and this parasite is shown to harm wild salmonid populations. In this study, n = 29,817 tagged Atlantic salmon were studied ...

    • Validation of a Swimming Direction Model for the Downstream Migration of Atlantic Salmon Smolts 

      Szabo-Meszaros, Marcell; Silva, Ana T.; Bærum, Kim Magnus; Baktoft, Henrik; Alfredsen, Knut; Hedger, Richard David; Økland, Finn; Gjelland, Karl Øystein; Fjeldstad, Hans-Petter; Calles, Olle; Forseth, Torbjørn (Peer reviewed; Journal article, 2021)
      Fish swimming performance is strongly influenced by flow hydrodynamics, but little is known about the relation between fine-scale fish movements and hydrodynamics based on in-situ investigations. In the presented study, ...