• Biologiske undersøkelser i Altaelva 1981-2006. Oppsummering av kraftreguleringens konsekvenser for laksebestanden 

      Ugedal, Ola; Thorstad, Eva B.; Finstad, Anders G.; Fiske, Peder; Forseth, Torbjørn; Hvidsten, Nils Arne; Jensen, Arne J.; Koksvik, Jan Ivar; Reinertsen, Helge; Saksgård, Laila; Næsje, Tor F. (NINA rapport;, Research report, 2007)
      Nøkkelord : kraftregulering, Altaelva, Finnmark, laks, laksefangster, ungfisktetthet, vinterdødelighet, smoltproduksjon, bunnfauna, begroing
    • Density independent use of shallow riverine areas in juvenile Atlantic salmon 

      Puffer, Michael; Berg, Ole Kristian; Hamnes, Frøydis Bolme; Bentsen, Vidar; Koch, Wouter; Ugedal, Ola; Forseth, Torbjørn; Arnekleiv, Jo Vegar; Einum, Sigurd (Journal article; Peer reviewed, 2018)
      Habitat use of aquatic organisms is essential to evaluate effects of many environmental challenges like effects of hydro-power regulation, where stranding may occur under hydropeaking (rapid dewatering of shallow river ...
    • El-fiskemetodikk - Gamle problemer og nye utfordringer 

      Forseth, Torbjørn; Forsgren, Elisabet (NINA Rapport;488, Research report, 2009)
      El-fiske er et viktig verktøy i studier av elvelevende fisk. Metoden har bred anvendelse fra ren innsamling av fisk til tetthets- og bestandsestimater. I dag brukes tetthetsestimater rutinemessig i bestandsovervåkning ...
    • Energetic Consequences of Stranding of Juvenile Atlantic Salmon (Salmo salar L.) 

      Puffer, Michael; Berg, Ole Kristian; Einum, Sigurd; Saltveit, Svein Jakob; Forseth, Torbjørn (Journal article, 2017)
      An effect of hydropower and hydropeaking regulation in rivers is stranding of fish. Those fishes that survive stranding may experience stranding as a stressful situation. In four experimental stranding experiments (each ...
    • Experimental hydraulics on fish-friendly trash-racks: an ecological approach 

      Szabo-Meszaros, Marcell; Navaratnam, Christy Ushanth; Aberle, Jochen; Silva, Ana T.; Forseth, Torbjørn; Calles, Olle; Fjeldstad, Hans-Petter; Alfredsen, Knut (Journal article; Peer reviewed, 2018)
      The obstruction of fish migratory routes by hydroelectric facilities is worldwide one of the major threats to freshwater fishes. During downstream migration, fish may be injured or killed on the trash-racks or in the ...
    • Gytebestandsmål for laksebestander i Norge 

      Hindar, Ketil; Diserud, Ola; Fiske, Peder; Forseth, Torbjørn; Jensen, Arne J.; Uggedal, Ola; Jonsson, Nina; Sloreid, Svein Erik; Arnekleiv, Jo V.; Saltveit, Svein Jakob; Sægrov, , Harald; Sættem, Leif Magnus (NINA rapport;226, Research report, 2007)
      Denne rapporten gir forslag til gytebestandsmål for laks (Salmo salar) i 80 viktige laksevassdrag i Norge. Vassdragene er valgt ut på bakgrunn av at de er definert som – eller vurdert som – nasjonale laksevassdrag. Vi har ...
    • Interactions between local population density and limited habitat resources determine movements of juvenile Atlantic salmon 

      Teichert, Maxim; Foldvik, Anders; Einum, Sigurd; Finstad, Anders Gravbrøt; Forseth, Torbjørn; Ugedal, Ola (Journal article; Peer reviewed, 2017)
      Competition for limited resources and the resulting density-dependent processes are key factors in driving stream salmonid population dynamics. Here we test for the combined effects of density and shelter availability on ...
    • Methods to safeguard downstream migration of salmonids past hydropower structures 

      Szabo-Meszaros, Marcell (Doctoral theses at NTNU;2019:104, Doctoral thesis, 2019)
      Sustainable development of hydropower production must include measures to reduce the negative consequences of river fragmentations. Migratory Atlantic salmon (Salmo salar, L) is one of the species that can be severely ...
    • Modelling climate change effects on Atlantic salmon: Implications for mitigation in regulated rivers 

      Sundt-Hansen, Line Elisabeth Breivik; Hedger, Richard David; Ugedal, Ola; Diserud, Ola Håvard; Finstad, Anders Gravbrøt; Sauterleute, Julian Friedrich; Tøfte, Lena S; Alfredsen, Knut; Forseth, Torbjørn (Journal article; Peer reviewed, 2018)
      Climate change is expected to alter future temperature and discharge regimes of rivers. These regimes have a strong influence on the life history of most aquatic river species, and are key variables controlling the growth ...
    • 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 ...
    • Multi-criteria decision analysis in Bayesian networks - diagnosing ecosystem service trade-offs in a hydropower regulated river 

      Barton, David Nicholas; Sundt, Håkon; Adeva Bustos, Ana; Fjeldstad, Hans-Petter; Hedger, Richard David; Forseth, Torbjørn; Köhler, Berit; Aas, Øystein; Alfredsen, Knut; Madsen, Anders L. (Journal article; Peer reviewed, 2019)
      The paper demonstrates the use of Bayesian networks in multicriteria decision analysis (MCDA) of environmental design alternatives for environmental flows (eflows) and physical habitat remediation measures in the Mandalselva ...
    • Ontogenetic timing of density dependence: location-specific patterns reflect distribution of a limiting resource 

      Teichert, Maxim; Einum, Sigurd; Finstad, Anders Gravbrøt; Ugedal, Ola; Forseth, Torbjørn (Journal article; Peer reviewed, 2013)
      Theoretical considerations suggest that the relative abundance of age-specific limiting resources determines the ontogenetic timing of density dependence. Structural shelters may represent one such resource which can become ...
    • Seasonal effects of hydropeaking on growth, energetics and movement of juvenile atlantic salmon (Salmo salar) 

      Puffer, Michael; Berg, Ole Kristian; Huusko, Ari; Vehanen, Teppo; Forseth, Torbjørn; Einum, Sigurd (Journal article; Peer reviewed, 2015)
      The performance and movements of juvenile Atlantic salmon Salmo salar exposed to variable water discharge (simulating hydropeaking) but with a stable water‐covered area were studied in six experimental stream channels, ...
    • Socio-environmental integration of hydropower facilities 

      Harby, Atle; Forseth, Torbjørn; Bakken, Tor Haakon; Ruud, Audun (Journal article; Peer reviewed, 2017)
      Centre for Environmental Design of Renewable Energy (CEDREN) is a research centre focusing on hydropower production and environmental impacts of hydropower. The main objective of CEDREN is to develop and communicate design ...
    • Utfall av Trollheim kraftverk i juli 2008 - Effekter av fiskebestandene i Surna 

      Forseth, Torbjørn; Stickler, Morten; Ugedal, Ola; Sundt, Håkon; Bremset, Gunnbjørn; Linnansaari, Tommi; Hvidsten, Nils Arne; Harby, Atle; Bongard, Terje; Alfredsen, Knut (NINA Rapport;435, Research report, 2009)
      An accidental stop in the turbine in the Trollheim Hydropower Plant on 27th July 2008 caused a drop in downstream discharge in the River Surna from 21 to 3 m3/s during 100 min. River discharge was reestablished after ...