Blar i NORCE vitenarkiv på forfatter "Ugedal, Ola"
-
Development of a risk assessment for sea trout in coastal areas exploited for aquaculture
Finstad, Bengt; Sandvik, Anne Dagrun; Ugedal, Ola; Vollset, Knut; Karlsen, Ørjan; Davidsen, Jan Grimsrud; Sægrov, Harald; Lennox, Robert J. (Peer reviewed; Journal article, 2021)The regulation of aquaculture production in Norway considers the potential impact of salmon lice on wild fish. However, most attention has been focused on impacts on wild Atlantic salmon, despite the fact that anadromous ... -
Ecological regime shift in the Northeast Atlantic Ocean revealed from the unprecedented reduction in marine growth of Atlantic salmon
Vollset, Knut; Urdal, Kurt; Utne, Kjell Rong; Thorstad, Eva Bonsak; Sægrov, Harald; Raunsgard, Astrid; Skagseth, Øystein; Lennox, Robert; Østborg, Gunnel Marie; Ugedal, Ola; Jensen, Arne Johan; Bolstad, Geir Hysing; Fiske, Peder (Peer reviewed; Journal article, 2022)Ecological regime shifts are abrupt changes in the structure and function of ecosystems that persist over time, but evidence of contemporary regime shifts are rare. Historical scale data from 52,384 individual wild Atlantic ... -
Effektivitet og kost-nytte forhold av fysiske miljøtiltak i vassdrag
Pulg, Ulrich; Stranzl, Sebastian Franz; Espedal, Espen Olsen; Gabrielsen, Sven-Erik; Postler, Christoph; Ugedal, Ola; Jensås, Jan Gunnar; Bremset, Gunnbjørn; Fjeldstad, Hans-Petter; Alfredsen, Knut (LFI - Laboratorium for ferskvannsøkologi og innlandsfiske, Research report, 2020)Det er økt fokus på bedring av fysiske miljøforhold i vassdrag, og med dette har behovet for å kunne vurdere kostnader og nytte ved slike tiltak økt. Prinsippet om «positiv kost-nytte» legges eksempelvis til grunn ved ... -
Evaluation of genetic effects on wild salmon populations from stock enhancement
Hagen, Ingerid Julie; Ugedal, Ola; Jensen, Arne Johan; Lo, Håvard; Holthe, Espen; Bjøru, Bjørn; Florø-Larsen, Bjørn; Sægrov, Harald; Skoglund, Helge; Karlsson, Sten (Peer reviewed; Journal article, 2020)Many salmonid populations are of conservation concern, and the release of hatchery-produced juveniles is a frequently used measure to alleviate declines and increase harvest opportunities. While such releases may be of ... -
Predicting the nationwide outmigration timing of Atlantic salmon (Salmo salar) smolts along 12 degrees of latitude in Norway
Vollset, Knut; Lennox, Robert J.; Lamberg, Anders; Skaala, Øystein; Sandvik, Anne Dagrun; Sægrov, Harald; Kvingedal, Eli; Kristensen, Torstein; Jensen, Arne Johan; Haraldstad, Tormod; Barlaup, Bjørn Torgeir; Ugedal, Ola (Journal article; Peer reviewed, 2021)Aim Accurate predictions about transition timing of salmon smolts between freshwater and marine environments are key to effective management. We aimed to use available data on Atlantic salmon smolt migration to predict ...