Blar i Brage IMR på forfatter "Borgstrøm, Reidar"
-
A conservation plan for Atlantic salmon (Salmo salar) and anadromous brown trout (Salmo trutta) in a region with intensive industrial use of aquatic habitats, the Hardangerfjord, western Norway
Skaala, Øystein; Johnsen, Geir Helge; Lo, Håvard; Borgstrøm, Reidar; Wennevik, Vidar; Hansen, Michael Møller; Merz, Joseph E.; Glover, Kevin A.; Barlaup, Bjørn T. (Journal article; Peer reviewed, 2013-10-15)Extensive use of aquatic habitats, mainly for hydropower and aquaculture, has a negative impact on anadromous salmonid populations of the Hardangerfjord region, western Norway. High infection levels of salmon lice, and ... -
An extensive common‐garden study with domesticated and wild Atlantic salmon in the wild reveals impact on smolt production and shifts in fitness traits
Skaala, Øystein; Besnier, Francois; Borgstrøm, Reidar; Barlaup, Bjørn Torgeir; Sørvik, Anne Grete Eide; Normann, Eirik; Østebø, Britt Iren; Hansen, Michael Møller; Glover, Kevin (Journal article; Peer reviewed, 2019)Interactions between domesticated escapees and wild conspecifics represent a threat to the genetic integrity and fitness of native populations. For Atlantic salmon, the recurrent presence of large numbers of domesticated ... -
Betydninga av lange tidsseriar i forvaltningsrelatert havbruksforsking: Sjøaure i Hardangerfjorden - Årlege svingingar i antal og vekst hos parr og vekst hos postsmolt
Borgstrøm, Reidar; Skaala, Øystein (Fisken og havet, Research report, 1999)The report includes studies on numbers, growth and survival of seatrout and salmon par in River Øyre, Kvinnherad from 1988 to 1998. The abundance of -
Differential changes in growth patterns of anadromous brown trout and Atlantic salmon from the River Etneelva over a 25-year period
Fjørtoft, Helene Børretzen; Borgstrøm, Reidar; Skaala, Øystein (Journal article; Peer reviewed, 2013-10-15)Freshwater and marine growth of anadromous brown trout (Salmo trutta) and Atlantic salmon (Salmo salar) from the River Etneelva was analysed in relation to river, fjord and ocean temperatures during the periods 1976-1982 ... -
Evaluering av effekten på fiskeproduksjonen i Guddalselva, Kvinnherad (Hordaland)
Skaala, Øystein; Borgstrøm, Reidar; Fjellheim, A.; Fossheim, T. (Fisken og havet, Research report, 2002)The project is a collaboration between the Institute of Marine Research, the Environmental programme under the Norwegian Electricity Directorate, the Directorate for Nature Management, the Fisheries Directorate, the ... -
Evidence of salmon lice-induced mortality of anadromous brown trout (Salmo trutta) in the Hardangerfjord, Norway
Skaala, Øystein; Kålås, Steinar; Borgstrøm, Reidar (Journal article; Peer reviewed, 2013-10-15)The Hardangerfjord, western Norway, is an area with a high concentration of salmon farms, high levels of infection of salmon lice in anadromous brown trout, and declining trout populations. This study assessed the marine ... -
Expected Climate Change in the High Arctic—Good or Bad for Arctic Charr?
Svenning, Martin; Bjørvik, Eigil T.; Godiksen, Jane Aanestad; Hammar, Johan; Kohler, Jack; Borgstrøm, Reidar; Yoccoz, Nigel Gilles (Peer reviewed; Journal article, 2023)Lakes in the High Arctic are characterized by their low water temperature, long-term ice cover, low levels of nutrients, and low biodiversity. These conditions mean that minor climatic changes may be of great importance ... -
Genetic impact on two wild brown trout (Salmo trutta) populations after release of non-indigenous hatchery spawners
Skaala, Øystein; Jørstad, Knut Eirik; Borgstrøm, Reidar (Journal article; Peer reviewed, 1996)A genetically marked hatchery strain of brown trout (Salmo trutta) was employed to study the genetic impact from non-indigenous hatchery fish on wild stocks. The hatchery spawners were released in autumn 1989 into the ... -
Hardangerfjorden - produksjon av laksefisk og effekter på de ville bestandene av laksefisk
Otterå, Håkon; Skilbrei, Ove; Skaala, Øystein; Boxaspen, Karin; Aure, Jan; Taranger, Geir Lasse; Ervik, Arne; Borgstrøm, Reidar (Fisken og havet, Research report, 2004)Wild populations of salmon and seatrout in the Hardanger Fjord show significant declines in recent years.The report also describes the hydrographical conditions and the aquaculture production of salmonids in the fjord. The ... -
Lakselus og rømt oppdrettslaks
Skaala, Øystein; Borgstrøm, Reidar (Chronicle, 2011-07-25) -
Microsatellite DNA used for parentage identification of partly digested Atlantic salmon (Salmo salar) juveniles through non-destructive diet sampling in salmonids
Skaala, Øystein; Glover, Kevin A.; Barlaup, Bjørn T.; Borgstrøm, Reidar (Journal article; Peer reviewed, 2013-10-15)Predation during early life history is an important component of fitness in salmonids. Farmed Atlantic salmon display lower survival in the wild in comparison to wild salmon; however, the underlying mechanisms remain ... -
Regnbueørret (Onchorhynchus mykiss); produksjon og interaksjoner med stedegne arter
Skaala, Øystein; Borgstrøm, Reidar; Solberg, Monica Favnebøe; Fiske, Peder; Hindar, Kjetil; Jensen, Arne Johan; Mo, Tor Atle; Sægrov, Harald; Barlaup, Bjørn Torgeir (Rapport fra havforskningen;2020 - 21, Research report, 2020) -
Rømt regnbogeaure - økologiske interaksjonar med vill laks og sjøaure
Borgstrøm, Reidar; Skaala, Øystein (Havforskningstema;Nr.1-2008, Working paper, 2008) -
Time series covering up to four decades reveals major changes and drivers of marine growth and proportion of repeat spawners in an Atlantic salmon population
Harvey, Alison C.; Skaala, Øystein; Borgstrøm, Reidar; Andersen-Fjeldheim, Per Tommy; Andersen-Fjeldheim, Kaja Christine; Utne, Kjell Rong; Johnsen, Ingrid Askeland; Fiske, Peder; Winterthun, Synnøve; Knutar, Sofie; Sægrov, Harald; Urdal, Kurt; Glover, Kevin Alan (Peer reviewed; Journal article, 2022)Wild Atlantic salmon populations have declined in many regions and are affected by diverse natural and anthropogenic factors. To facilitate management guidelines, precise knowledge of mechanisms driving population changes ...