Blar i forfatter "Ulvan, Eva Marita"

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    • Area use and movement patterns of wild and escaped farmed Atlantic salmon before and during spawning in a large Norwegian river 

      Moe, Karina; Næsje, Tor; Haugen, Thrond Oddvar; Ulvan, Eva Marita; Aronsen, Tonje; Sandnes, Tomas; Thorstad, Eva Bonsak (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-02-02)
      We compared the within-river movements and distribution of wild and escaped farmed Atlantic salmon Salmo salar before and during spawning in the Namsen river system of Central Norway. A total of 74 wild and 43 escaped farmed salmon were captured at sea, tagged with radio transmitters and released. Based on our examinations, most, if not all salmon (farmed and wild) entering the River Namsen were ...

    • Atferd og spredning av rømt oppdrettslaks og villaks i Namsen og andre elver. Resultater fra merking av laks i Namsfjorden og Vikna 

      Næsje, Tor; Ulvan, Eva Marita; Sandnes, Tomas*; Jensen, Jenny; Staldvik, Frode; Holm, Ragnar*; Landstad, Jan Arild*; Økland, Finn; Moe, Karina; Fiske, Peder; Heggberget, Tor Gravråk; Thorstad, Eva Bonsak (Research report; Forskningsrapport, 2013-04)
      Vi undersøkte atferd og spredning av rømt oppdrettslaks og villaks i Namsen og andre elver i Midt-Norge i 2012. Hovedmålsettingen var å skaffe kunnskap slik at man kan gjøre sikrere beregninger av den reelle andelen rømt oppdrettslaks i lakseelver. De ulike delmålene var å:  Vurdere sikkerheten i dagens metoder for beregning av andel oppdrettslaks i gytebe-stander av villaks.  Sammenligne ...

    • Return migration of adult Atlantic salmon (Salmo salar L.) to northern Norway 

      Ulvan, Eva Marita; Foldvik, Anders; Jensen, Arne Johan; Finstad, Bengt; Thorstad, Eva Bonsak; Rikardsen, Audun H.; Næsje, Tor (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-09-18)
      The return migration of adult Atlantic salmon was investigated by analysing recaptures of individuals tagged and released as smolts in the River Altaelva and the River Halselva using a catch per unit effort approach. Although the salmon were recaptured over a large area along the coastline (from >1100 km south to>500 km northeast of their home rivers), the results indicated a relatively accurate ...