Blar i Brage IMR på forfatter "Johansen, Geir Odd"
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Climate change and new potential spawning sites for Northeast Arctic cod
Sandø, Anne Britt; Johansen, Geir Odd; Aglen, Asgeir; Stiansen, Jan Erik; Renner, Angelika (Peer reviewed; Journal article, 2020)In this study we investigate both historical and potential future changes in the spatial distribution of spawning habitats for Northeast Arctic cod (NEA cod) based on a literature study on spawning habitats and different ... -
Cod Consume Capelin
Johannesen, Edda; Johansen, Geir Odd; Bogstad, Bjarte; Mehl, Sigbjørn; Tjelmeland, Sigurd; Dolgov, Andrey V. (Working paper, 2006) -
Consumption of juvenile herring (Clupea harengus) by cod (Gadus morhua) in the Barents Sea: a new approach to estimating consumption in piscivorous fish
Johansen, Geir Odd; Bogstad, Bjarte; Mehl, Sigbjørn; Ulltang, Øyvind (Journal article; Peer reviewed, 2004)Consumption of different age groups of juvenile, Norwegian, spring-spawning herring (Clupea harengus) by northeast Arctic cod (Gadus morhua) in the Barents Sea in 1992–1997 is estimated using cod stomach content data. We ... -
Diel vertical movements determine spatial interactions between cod, pelagic fish and krill on an Arctic shelf bank
Skaret, Georg; Johansen, Geir Odd; Johnsen, Espen; Fall, Johanna Jennifer Elisabeth; Fiksen, Øyvind; Englund, Gøran; Fauchald, Per; Gjøsæter, Harald; Macaulay, Gavin; Johannesen, Edda (Peer reviewed; Journal article, 2020)Predator-prey spatial interactions are essential to understand ecosystem processes like predation rates and trophic interaction strength. In marine systems, such spatial interactions are highly dynamic and difficult to ... -
Effects of climate change on the fish stocks in the high north seas
Johansen, Geir Odd (Lecture, 2010)Summarizes the effects of climate variation on geographic distribution of fish in northern seas. -
Flytter torsken?
Stiansen, Jan Erik; Johansen, Geir Odd; Kvamme, Cecilie; Mehl, Sigbjørn; Ådlandsvik, Bjørn; Hannesson, Rögnvaldur; Ekerhovd, Nils Arne (Journal article, 2009-10) -
IESSNS international mackerel-ecosystem survey (2014813) 01.07.2014-28.07.2014
Johansen, Geir Odd; Grimsbø, Endre (Research report, 2014)Ecosystem cruise with abundance estimation and biological sampling of Northeast Atlantic (NEA) mackerel and Norwegian spring-spawning (NSS) herring. Predetermined station net for systematic biological sampling with the ... -
Instituttets infrastrukturprosjekt Sea2Data
Handegard, Nils Olav; Gjøsæter, Harald; Johansen, Geir Odd; Krakstad, Jens-Otto; Moksness, Erlend; Sagen, Helge; Vølstad, Jon Helge; Westgård, Trond (Conference object, 2010-11-03) -
Methodology for assessment of the capelin spawning migration in the Barents Sea, spring 2008
Eriksen, Elena; Johansen, Geir Odd; Pedersen, Geir; Peña, Hector; Svellingen, Ingvald; Tjelmeland, Sigurd ([Toktrapport/Havforskningsinstituttet];Nr. 8 - 2008, Working paper, 2008) -
Methodology for assessment of the capelin spawning migration in the Barents Sea, spring 2009
Eriksen, Elena; Johansen, Geir Odd; Tjelmeland, Sigurd; Peña, Hector; Alvarez, Jaime ([Toktrapport/Havforskningsinstituttet];Nr. 1 - 2009, Working paper, 2009) -
Metodiske undersøkelser av gyteinnsiget av lodde langs Finnmarkskysten, våren 2007
Johansen, Geir Odd; Torkelsen, Terje; Alvarez, Jaime; Røttingen, Jostein; Tenningen, Maria; Johansson, Thor Egil; Skjold, Bente ([Toktrapport/Havforskningsinstituttet];Nr. 12 - 2007, Working paper, 2007) -
Predator–prey overlap in three dimensions: cod benefit from capelin coming near the seafloor
Fall, Johanna Jennifer Elisabeth; Johannesen, Edda; Englund, Göran; Johansen, Geir Odd; Fiksen, Øyvind (Peer reviewed; Journal article, 2021)Spatial overlap between predator and prey is a prerequisite for predation, but the degree of overlap is not necessarily proportional to prey consumption. This is because many of the behavioural processes that precede ... -
Predicting recruitment of 0-group gadoids in the Barents Sea - critical interaction between models and observations
Johansen, Geir Odd; Skogen, Morten D.; Godø, Olav Rune; Torkelsen, Terje (ICES CM documents, Working paper, 2007)The most important gadoid fish stocks of the Barents Sea spawn along the coast of Norway. The eggs, larvae and juveniles are transported northwards with the oceanic coastal currents from the spawning grounds towards their ... -
Samlet påvirkning i foreslåtte særlig verdifulle og sårbare områder i norske havområder
Hansen, Cecilie; Aarflot, Johanna Myrseth; Eriksen, Elena; Husson, Berengere; Fauchald, Per; Johansen, Geir Odd; Jørgensen, Lis Lindal; van der Meeren, Gro Ingleid; Mikkelsen, Nina; Ottersen, Geir; von Quillfeldt, Cecilie; Skern-Mauritzen, Mette (Rapport fra havforskningen;2022 - 46, Research report, 2022)I dette arbeidet er det gjort en vurdering av risiko fra samlet påvirkning med tilhørende usikkerhet for aktive sektorer i norske havområder, for hvert av havområdene Nordsjøen, Norskehavet og Barentshavet, og for hvert ... -
Spatial distribution of fish stocks in a climate perspective
Johansen, Geir Odd (Conference object, 2011)Summarizes the effects of climate variation on geographic distribution of fish, with examples from the Barents Sea. -
StoX applied to cod and haddock data from the Barents Sea NOR-RUS ecosystem cruise in autumn - Swept area abundance, length and weight at age 2004-2017
Johannesen, Edda; Johnsen, Espen; Johansen, Geir Odd; Korsbrekke, Knut (Fisken og Havete;2019 - 6, Research report, 2019)North East Arctic cod and haddock are the largest stocks of these species in the world. Data from the Barents Sea NOR-RUS ecosystem cruise (BESS) in autumn is used as input to the assessment of these species. Here, we used ... -
Survey report from the joint Norwegian/Russian Ecosystem Survey in the Barents Sea and adjacent waters, August - October 2017
Prozorkevich, Dmitry A.; Johansen, Geir Odd; van der Meeren, Gro Ingleid (IMR/PINRO Joint Report Series;2018 - 2, Research report, 2018)The aim of the joint Norwegian/Russian ecosystem survey in the Barents Sea and adjacent waters, August-October (BESS) is to monitor the status of abiotic and biotic factors and changes of these in the Barents Sea ecosystem. ... -
Survey report from the joint Norwegian/Russian Ecosystem Survey in the Barents Sea and the adjacent waters August- December 2022
Johansen, Geir Odd; Trofimov, Alexander; Ingvaldsen, Randi Brunvær; Prokhorova, Tatiana; Grøsvik, Bjørn Einar; Krivosheya, Pavel; Bagøien, Espen; Lerch, Sarah Joanne; Prokopchuk, Irina; Eriksen, Elena; Husson, Berengere; Skaret, Georg; Johannesen, Edda; Bogstad, Bjarte; Windsland, Kristin; Höffle, Hannes; Wienerroither, Rupert; Hvingel, Carsten; Dolgov, Andrey; Hjelset, Ann Merete; Bakanev, Sergey; Stesko, Aleksei; Jørgensen, Lis Lindal; Øien, Nils Inge; Boehm, Frederike; Strelkova, Natalia; Blinova, Daria; Klepikovskiy, Roman; Fauchald, Per (IMR/PINRO Joint Report Series, Research report, 2023)The aim of the joint Norwegian/Russian ecosystem survey in the Barents Sea and adjacent waters, August-October (BESS) is to monitor the status and changes in the Barents Sea ecosystem and provide data to support stock ... -
Testing acoustic platforms and methodology for observing marine ecosystem processes [1/10 - 20/10, 2006]
Johansen, Geir Odd; Godø, Olav Rune; Pedersen, Geir; Staurland Aarbakke, Ole Nicolai; Torkelsen, Terje; Totland, Atle ([Toktrapport/Havforskningsinstituttet];Nr. 10 - 2006, Working paper, 2006) -
Testing acoustic platforms and methodology for studying behaviour of demersal fish in a bottom trawl survey [19/9 - 10/10, 2005]
Godø, Olav Rune; Handegard, Nils Olav; Johansen, Geir Odd; Torkelsen, Terje; Totland, Atle; Pedersen, Ronald ([Toktrapport/Havforskningsinstituttet];Nr. 21 - 2005, Working paper, 2005)