Browsing NINA Brage by Author "Thorstad, Eva Bonsak"
Now showing items 1-20 of 84
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A review of acoustic telemetry in Europe and the need for a regional aquatic telemetry network
Abecasis, David; Steckenreuter, Andre; Reubens, Jan; Aarestrup, Kim; Alós, Josep; Badalamenti, Fabio; Bajona, Lenore; Boylan, Patrick; Deneudt, Klaas; Greenberg, Larry; Brevé, Niels; Hernández, Francisco; Humphries, Nick; Meyer, Carl; Sims, David; Thorstad, Eva Bonsak; Walker, Alan M.; Whoriskey, Fred; Afonso, Pedro (Journal article; Peer reviewed, 2018)Background: Globally, there are a large and growing number of researchers using biotelemetry as a tool to study aquatic animals. In Europe, this community lacks a formal network structure. The aim of this study is to review ... -
A Review of Pink Salmon in the Pacific, Arctic, and Atlantic Oceans
April, Julien; Bean, Colin W.; Berntsen, Johan Henrik Hårdensson; Dunmall, Karen M.; Ensing, Dennis; Erkinaro, Jaakko; Farley, Ed; Fossøy, Frode; Gilk-Baumer, Sara; Habicht, Chris; Howard, Katie; Irvine, James R.; Karlsson, Sten; Kendall, Neala W.; Kitching, Tor; Langan, Joseph A.; Latham, Steve; Lee, Elizabeth; Meerburg, David; Millane, Michael; Munro, Andrew; Orlov, Polina; Oxman, Dion; Radchenko, Vladimir I.; Schubert, Aidan; Thorstad, Eva Bonsak; Utne, Kjell Rong; Walker, Alan; Wells, Alan (North Pacific Anadromous Fish Commission. Technical Report, Research report, 2023)The Northern Hemisphere Pink Salmon Expert Group Meeting was held on October 2–3, 2022 in Vancouver, Canada, immediately preceding the International Year of the Salmon (IYS) Synthesis Symposium. The rapid expansion of pink ... -
Age of European silver eels during a period of declining abundance in Norway
Durif, Caroline; Diserud, Ola Håvard; Sandlund, Odd Terje; Thorstad, Eva Bonsak; Poole, Russell; Bergesen, Knut Aanestad; Escobar-Lux, Rosa H.; Shema, Steven; Vøllestad, Leif Asbjørn (Journal article, 2020)The European eel (Anguilla anguilla) is critically endangered throughout its range. Knowledge about age distribution of future spawners (silver eels) is essential to monitor the status and contribute to the recovery of ... -
Annual and diel activity cycles of a northern population of the large migratory cyprinid fish asp (Leuciscus aspius)
Kärgenberg, Einar; Sandlund, Odd Terje; Thorstad, Eva Bonsak; Thalfeldt, Mart; Økland, Finn; Kaasik, Ants; Tambets, Meelis (Peer reviewed; Journal article, 2022)Little is known about the exact movement parameters of migratory cyprinids listed as conservation priorities. A northern population of predatory asp, listed on the Bern Convention Appendix III, was studied in a near ... -
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, 2016)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 ... -
Assessment of the risk to Norwegian biodiversity and aquaculture from pink salmon (Oncorhynchus gorbuscha). Scientific Opinion of the Panel on Alien Organisms and Trade in Endangered Species of the Norwegian Scientific Committee for Food and Environment
Hindar, Kjetil; Hole, Lars Robert; Kausrud, Kyrre Linné; Malmstrøm, Martin; Rimstad, Espen; Robertson, Lucy; Sandlund, Odd Terje; Thorstad, Eva Bonsak; Vollset, Knut; de Boer, Hugo; Eldegard, Katrine; Järnegren, Johanna; Kirkendall, Lawrence Richard; Måren, Inger Elisabeth; Nilsen, Erlend Birkeland; Rueness, Eli Knispel; Nielsen, Anders; Velle, Gaute (Peer reviewed; Journal article, 2020)The Norwegian Environment Agency and the Norwegian Food Safety Authority asked the Norwegian Scientific Committee for Food and Environment to assess the risk to Norwegian biodiversity, to the productivity of native salmonid ... -
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 (NINA Rapport;931, Research report, 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 ... -
Atlantic salmon in a rapidly changing environment—Facing the challenges of reduced marine survival and climate change
Thorstad, Eva Bonsak; Bliss, Doug; Breau, Cindy; Damon-Randall, Kimberly; Sundt-Hansen, Line Elisabeth Breivik; Hatfield, Emma M.C.; Horsburgh, Grant; Hansen, Heidi; Maoiléidigh, Niall Ó.; Sheehan, Timothy F.; Sutton, Stephen G. (Peer reviewed; Journal article, 2021)1. Atlantic salmon populations have declined in recent decades. Many of the threats to the species during its freshwater and coastal residency periods are known, and management approaches are available to mitigate them. ... -
Behaviour and habitat use of first-time migrant Arctic charr: novel insights from a subarctic marine area
Nordli, Eivind; Strøm, John Fredrik; Bøhn, Thomas; Thorstad, Eva Bonsak; Serra Llinares, Rosa Maria; Nilsen, Rune; Bjørn, Pål Arne (Peer reviewed; Journal article, 2023)Anadromous Arctic charr Salvelinus alpinus is a cold-adapted salmonid that is vul nerable to climate warming and anthropogenic activities including salmon farming, hydropower regulation, and pollution, which poses a ... -
Behaviour and mortality of downstream migrating Atlantic salmon smolts at a small power station with multiple migration routes
Kärgenberg, Einar; Thorstad, Eva Bonsak; Järvekülg, Rein; Sandlund, Odd Terje; Saadre, Ene; Økland, Finn; Thalfeldt, Mart; Tambets, Meelis (Journal article; Peer reviewed, 2019)Salmon smolts were released upstream of a run‐of‐river hydropower site and recaptured downstream for inspection. Descending fish behaviour through three possible migration routes (turbines, fishway, spillway) was analysed ... -
Behaviour and survival of wild Atlantic salmon Salmo salar captured and released while surveillance angling for escaped farmed salmon
Lennox, Robert J.; Havn, Torgeir Børresen; Thorstad, Eva Bonsak; Liberg, Egil; Cooke, Steven J.; Uglem, Ingebrigt (Journal article; Peer reviewed, 2017)In many Norwegian rivers, spawning stocks are surveyed for escaped farmed salmon with surveillance fishing by rod and reel after the recreational angling season. However, the benefits of surveillance fishing depend on the ... -
Beskatning og bestandsstørrelse av laks i Namsenvassdraget
Thorstad, Eva Bonsak; Fiske, Peder; Staldvik, Frode; Økland, Finn (NINA rapport;747, Research report, 2011)Thorstad, E.B., Fiske, P., Staldvik, F. & Økland, F. 2011. Beskatning og bestandsstørrelse av laks i Namsenvassdraget 2010. - NINA Rapport 747: 1-32. Undersøkelser av beskatningsrater og bestandsstørrelse i Namsenvassdraget ... -
Bioenergetic consequences of warming rivers to adult Atlantic salmon Salmo salar during their spawning migration
Lennox, Robert J.; Eliason, Erika J.; Havn, Torgeir Børresen; Johansen, Martin Rognli; Thorstad, Eva Bonsak; Cooke, Steven J.; Diserud, Ola Håvard; Whoriskey, Frederick G.; Farrell, Anthony P.; Uglem, Ingebrigt (Journal article; Peer reviewed, 2018)1. Climate change poses a challenge to wild fishes, yet little is known about the behavioural use and metabolic consequences of thermally heterogeneous water encountered by wild salmon during their energetically demanding ... -
Biologiske undersøkelser i Altaelva 2005
Ugedal, Ola; Thorstad, Eva Bonsak; Næsje, Tor; Saksgård, Laila M.; Reinertsen, Helge; Fiske, Peder; Hvidsten, Nils Arne; Blom, Hans H. (NINA Rapport;177, Research report, 2006)Ugedal, O., Thorstad, E. B., Næsje, T. F., Saksgård, L., Reinertsen, H. R., Fiske, P., Hvidsten, N. A. og Blom, H. H. 2006. Biologiske undersøkelser i Altaelva 2005. NINA Rapport 177. 52 pp. Altaelva er ei av Norges ... -
Biologiske undersøkelser i Altaelva. Faglig oppsummering og kommentarer til forslag om varig manøvreringsreglement
Næsje, Tor; Fiske, Peder; Forseth, Torbjørn; Thorstad, Eva Bonsak; Ugedal, Ola; Finstad, Anders Gravbrøt; Hvidsten, Nils Arne; Jensen, Arne Johan; Saksgård, Laila M. (NINA Rapport;80, Research report, 2005)Næsje, T. F., Fiske, P., Forseth, T., Thorstad, E. B., Ugedal, O., Finstad, A. G., Hvidsten, N. A., Jensen, A. J. og Saksgård, L. 2005. Biologiske undersøkelser i Altaelva. Faglig oppsummering og kommentarer til forslag ... -
Biotic and abiotic determinants of the ascent behaviour of adult Atlantic salmon transiting passable waterfalls
Lennox, Robert J.; Thorstad, Eva Bonsak; Diserud, Ola Håvard; Økland, Finn; Cooke, Steven J.; Aasestad, Ingar; Forseth, Torbjørn (Journal article; Peer reviewed, 2018)The spawning migration of Atlantic salmon has been characterized by tracking salmon carrying electronic tags as they ascend rivers, but still little is known about how natural obstacles such as waterfalls influence migratory ... -
Comparing dominance relationships and movement of native marble trout (Salmo marmoratus) and introduced rainbow trout (Oncorhynchus mykiss)
Pengal, Polona; Cokan, Blaz; Økland, Finn; Höjesjö, Johan; Tambets, Meelis; Thorstad, Eva Bonsak (Peer reviewed; Journal article, 2023) -
Development and testing of attachment methods for pop-up satellite archival transmitters in European eel
Økland, Finn; Thorstad, Eva Bonsak; Westerberg, Håkan; Aarestrup, Kim; Metcalfe, Julian D. (Peer reviewed, 2013)Background: Four methods for attaching pop-up satellite transmitters to European eel were tested in the laboratory by recording long-term tag retention, growth and survival; short-term behavioral responses; and physical ... -
Does Catch-and-Release Angling Alter the Behavior and Fate of Adult Atlantic Salmon During Upriver Migration?
Lennox, Robert J.; Uglem, Ingebrigt; Cooke, Steven J.; Næsje, Tor; Whoriskey, Frederick G.; Havn, Torgeir Børresen; Ulvan, Eva Marita; Solem, Øyvind; Thorstad, Eva Bonsak (Journal article; Peer reviewed, 2015)To reproduce, Atlantic Salmon Salmo salar return to freshwater rivers and migrate upriver to spawning areas. This migration is the basis for recreational fisheries, which for conservation reasons are increasingly characterized ... -
Effects of a dispersal barrier on freshwater migration of the vimba bream (Vimba vimba)
Tambets, Meelis; Kärgenberg, Einar; Thorstad, Eva Bonsak; Sandlund, Odd Terje; Økland, Finn; Thalfeldt, Mart (Journal article; Peer reviewed, 2018)To study the effects of a dispersal barrier on migration of the semi-anadromous vimba bream in the Pärnu River, Estonia, we tagged thirty fish with acoustic transmitters and released above the barrier. Tagged fish showed ...