Blar i Publikasjoner fra CRIStin på forfatter "Gjøsæter, Harald"
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A logistic function to track time-dependent fish population dynamics
Jokar, Mahmood; Subbey, Samuel; Gjøsæter, Harald (Peer reviewed; Journal article, 2021) -
Abundance indices for norwegian coastal cod north of 62°N
Aglen, Asgeir; Fall, Johanna Jennifer Elisabeth; Gjøsæter, Harald; Staby, Arved (Rapport fra havforskningen;2021 - 6, Research report, 2021)In connection with the benchmark processes within ICES on Norwegian Coastal Cod north of 62°N during autumn 2020-spring 2021, new abundance index series based on bottom trawl stations and acoustics at the autumn coastal ... -
Acoustic scattering layers reveal a faunal connection across the Fram Strait
Gjøsæter, Harald; Ingvaldsen, Randi Brunvær; Christiansen, Jørgen Schou (Peer reviewed; Journal article, 2020)Acoustic scattering layers (SL) at various depths are common phenomena in most oceans, but the organisms that make up these layers vary and so does their density, and hence the backscattered energy. During two crossings ... -
Arctic Fisheries Working Group (AFWG; outputs from 2022 meeting)
Howell, Daniel; Godiksen, Jane Aanestad; Tranang, Caroline Aas; Berg, Erik; Bernreuther, Matthias; Bogstad, Bjarte; Breivik, Olav Nikolai; Casas, Jose Miguel; Clain, Laura; Eidset, Elise; Eriksen, Elena; Fall, Johanna Jennifer Elisabeth; Fossheim, Maria; Gjøsæter, Harald; Gundersen, Sofie; Hallfredsson, Elvar Halldor; Höffle, Hannes; Johannessen, Edda; Nedreaas, Kjell Harald; Nielsen, Anders; Skaret, Georg; Staby, Arved; Stock, Brian; Subbey, Samuel; Tallman, Ross; Trochta, John Tyler; Vollen, Tone; Windsland, Kristin (Journal article, 2023) -
Atlantic cod (Gadus morhua)feeding over deep water in the high Arctic
Ingvaldsen, Randi Brunvær; Gjøsæter, Harald; Ona, Egil; Michalsen, Kathrine (Peer reviewed; Journal article, 2017) -
Barents Sea Capelin - Report of the Joint Russian-Norwegian Working Group on Arctic Fisheries (JRN-AFWG) 2022
Bogstad, Bjarte; Chetyrkin, Anatoly; Gjøsæter, Harald; Howell, Daniel; Hølleland, Sondre Nedreås (IMR/PINRO Joint Report Series;2022 - 8, Research report, 2022) -
A deep scattering layer under the North Pole pack ice
Snoeijs-Leijonmalm, Pauline; Gjøsæter, Harald; Ingvaldsen, Randi Brunvær; Knutsen, Tor; Korneliussen, Rolf; Ona, Egil; Skjoldal, Hein Rune; Stranne, Christian; Mayer, Larry; Jakobsson, Martin; Gårdfeldt, Katarina (Peer reviewed; Journal article, 2021)The 3.3 million km2 marine ecosystem around the North Pole, defined as the Central Arctic Ocean (CAO), is a blind spot on the map of the world’s fish stocks. The CAO essentially comprises the permanently ice-covered deep ... -
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 ... -
Distribution of rorquals and Atlantic cod in relation to their prey in the Norwegian high Arctic
Solvang, Hiroko K.; Haug, Tore; Knutsen, Tor; Gjøsæter, Harald; Bogstad, Bjarte; Hartvedt, Siri; Øien, Nils; Lindstrøm, Ulf (Peer reviewed; Journal article, 2021)Recent warming in the Barents Sea has led to changes in the spatial distribution of both zooplankton and fish, with boreal communities expanding northwards. A similar northward expansion has been observed in several rorqual ... -
Effekter av bunntråling - Sammenstilling av kunnskap om bunnpåvirkning fra trål og snurrevad relevant for norske farvann
Løkkeborg, Svein; Bakkeplass, Kjell Gunnar; Diesing, Markus; Gjøsæter, Harald; Gonzalez-Mirelis, Genoveva; Hvingel, Carsten; Jørgensen, Lis Lindal; Moland, Even; Norderhaug, Kjell Magnus; Rastrick, Samuel (Rapport fra havforskningen;2023 - 1, Research report, 2023)Rapporten gir en sammenstilling av publisert kunnskap om hvordan bunnhabitater og bunndyr påvirkes (fysiske, kjemiske og biologiske effekter) av fiske med bunntrål og snurrevad. Det legges hovedvekt på påvirkninger fra ... -
Environmental controls on macrozooplankton and fish distributions over diurnal to seasonal time scales in the northern Barents Sea
Cannaby, Heather Anne; Ingvaldsen, Randi Brunvær; Lundesgaard, Øyvind; Renner, Angelika; Skaret, Georg; Sakinan, Serdar S.; Chierici, Melissa; Gjøsæter, Harald (Peer reviewed; Journal article, 2023)We present acoustic observations obtained by bottom mounted echosounders at two locations in the northern Barents Sea and a third on the northern continental slope of the Barents Sea. Data collected over a period of ... -
Essay om fiskerier i Porsangerfjorden før og nå - et resultat av møter mellom fjordbrukere og forskere
Strand, Hans Kristian; Daleng, Jan; Eliassen, Tore; Follesø, Thor; Gjøsæter, Harald; Hansen, Hans Oliver; Hansen, Thomas; Johansen, Hartvig; Josefsen, Hedly; Larsen, Dagny; Martinsen, Terje; Nedreaas, Kjell Harald; Pedersen, Torstein; Skern-Mauritzen, Mette; Strand, Mette; Søvik, Guldborg; Zimmermann, Fabian (Rapport fra havforskningen;2020 - 41, Research report, 2020)Porsangerfjorden gikk fra å være en fiskerik fjord i første halvdelen av 1900-tallet, til en mye mer fiskefattig fjord i den andre halvdelen. Den fiskefattige tilstanden har vedvart fram til i dag. Den invaderende kongekrabben ... -
Evidence of diel vertical migration of mesopelagic sound-scattering organisms in the Arctic
Gjøsæter, Harald; Wiebe, Peter H.; Knutsen, Tor; Ingvaldsen, Randi Brunvær (Peer reviewed; Journal article, 2017) -
Fish assemblages at the Yermak Plateau and in northern Svalbard waters during the period 2012-2020
Gjøsæter, Harald; Ingvaldsen, Randi Brunvær; Hallfredsson, Elvar Halldor; Johannesen, Edda (Peer reviewed; Journal article, 2023)During several surveys covering the north-western and northern Svalbard waters, and the deeper Yermak Plateau north of Svalbard during the period 2012–2020, 291 standardized hauls with a demersal trawl were made. All fishes ... -
Fish assemblages at the Yermak Plateau and in northern Svalbard waters during the period 2012–2020
Gjøsæter, Harald; Ingvaldsen, Randi Brunvær; Hallfredsson, Elvar Halldor; Johannesen, Edda (Peer reviewed; Journal article, 2023)During several surveys covering the north-western and northern Svalbard waters, and the deeper Yermak Plateau north of Svalbard during the period 2012–2020, 291 standardized hauls with a demersal trawl were made. All fishes ... -
Fish investigations in the Barents Sea winter 2018.
Mehl, Sigbjørn; Aglen, Asgeir; Gjøsæter, Harald; Godiksen, Jane Aanestad; Staby, Arved; Wenneck, Thomas de Lange; Wienerroither, Rupert; Russkikh, Alexey A.; Tretyakov, Ivan (IMR/PINRO Joint Report Series;, Research report, 2018)This report presents the main results from the surveys in January-March 2018. The surveys were performed with the Norwegian research vessels “Helmer Hanssen” and “Johan Hjort” and Russian research vessel “Fritjof Nansen”. ... -
Fish Investigations in the Barents Sea Winter 2019
Mehl, Sigbjørn; Wenneck, Thomas de Lange; Aglen, Asgeir; Fuglebakk, Edvin; Gjøsæter, Harald; Godiksen, Jane Aanestad; Seim, Silje Elisabeth; Staby, Arved; Bogstad, Bjarte; Russkikh, Alexey A.; Fomin, Konstantin (IMR/PINRO Joint Report Series;, Research report, 2019)The Institute of Marine Research (IMR), Bergen, has performed acoustic measurements of demersal fish in the Barents Sea since 1976. Since 1981 a bottom trawl survey has been combined with the acoustic survey. Typical effort ... -
Fish investigations in the Barents Sea winter 2020
Fall, Johanna Jennifer Elisabeth; Wenneck, Thomas de Lange; Bogstad, Bjarte; Fuglebakk, Edvin; Gjøsæter, Harald; Seim, Silje Elisabeth; Skage, Malin Lie; Staby, Arved; Tranang, Caroline Aas; Windsland, Kristin; Russkikh, Alexey A.; Fomin, Konstantin (IMR/PINRO Joint Report Series;, Research report, 2020)This report presents the main results from the surveys in January-March 2020. The surveys were performed with the Norwegian research vessels “Helmer Hanssen” and “Johan Hjort” and the Russian research vessel “Vilnyus”. ... -
From single species surveys towards monitoring of the Barents Sea ecosystem
Eriksen, Elena; Gjøsæter, Harald; Prozorkevich, Dmitry V.; Shamray, Evgeny; Dolgov, Andrey V.; Skern-Mauritzen, Mette; Stiansen, Jan Erik; Kovalev, Yu; Sunnanå, Knut (Journal article; Peer reviewed, 2017)The Barents Sea, a large, high-latitude shelf sea, has been monitored and investigated for more than a century. More than 1800 occasional expeditions have been organized both by Norway and Russia, and since the1960s the ... -
Harp seal body condition and trophic interactions with prey in Norwegian high Arctic waters in early autumn
Haug, Tore; Biuw, Martin; Gjøsæter, Harald; Knutsen, Tor; Lindstrøm, Ulf; MacKanzie, Kirsteen M.; Meier, Sonnich; Nilssen, Kjell Tormod (Peer reviewed; Journal article, 2020)In September 2016, a marine ecosystem survey covered all trophic levels from phytoplankton to seals in the Arctic Ocean to the west and north of Svalbard. At the ice edge, 26 harp seals were sampled to assess whether recent ...