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Harald Gjøsæter
Norwegian Institute of Marine Research
OceanographyEcologyCapelinFisheryBiology
98Publications
25H-index
1,739Citations
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Publications 102
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#1Harald GjøsæterH-Index: 25
#2Randi IngvaldsenH-Index: 26
Last. Jørgen S. Christiansen (Åbo Akademi University)H-Index: 25
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Abstract 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 of the deep Fram Strait between the shelves at Svalbard and Northeast Greenland at latitudes 77°N and 79°N, we registered epipelagic and mesopelagic SL across the entire Fram Strait and quantified their acoustic backscattered energy. In addition, one pelagic trawl haul w...
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#1Nicolas Dupont (University of Oslo)H-Index: 7
#2Joël M. Durant (University of Oslo)H-Index: 21
Last. Leif Christian Stige (University of Oslo)H-Index: 20
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#1Harald GjøsæterH-Index: 25
Last. Elena EriksenH-Index: 10
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#1Georg SkaretH-Index: 10
#2Geir Odd JohansenH-Index: 2
Last. Edda JohannesenH-Index: 16
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Abstract The range limitation (>200 m) for high-frequency echosounders does not allow for complete multifrequency studies of the mesopelagic layers from vessel-mounted echosounders. The layers of mesopelagic fish and zooplankton in the Arctic region north of Svalbard (Spitsbergen) were studied using vessel-mounted echosounders and a profiling acoustic probe, using 38, 120,200 and 333 kHz. Volume density estimates of mesopelagic fish have shown to be marginally higher with the probing system in r...
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#1Elena EriksenH-Index: 10
Last. Jon AlbretsenH-Index: 12
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Spawning of polar cod (Boreogadus saida) in the vicinity of the Svalbard archipelago has not been directly observed. From the distribution pattern of polar cod 0-group observed during annual monitoring of the Barents Sea, it has, however, been inferred that spawning occurs in Svalbard waters most years. We wanted to investigate the possibility of back-tracking the larvae from these observed distribution areas to the spawning areas from which they originated and applied a coupled ocean–sea ice an...
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#1Tor KnutsenH-Index: 11
#2Peter H. Wit (WHOI: Woods Hole Oceanographic Institution)H-Index: 52
Last. Gunnar LienH-Index: 1
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Scattering structures, including deep (>200 m) scattering layers are common in most oceans, but have not previously been properly documented in the Arctic Ocean. In this work, we combine acoustic data for distribution and abundance estimation of zooplankton and fish with biological sampling from the region west and north of Svalbard, to examine high latitude meso- and epipelagic scattering layers and their biological constituents. Our results show that typically, there was strong patchy scatteri...
6 CitationsSource
#1Harald GjøsæterH-Index: 25
#2Peter H. Wit (WHOI: Woods Hole Oceanographic Institution)H-Index: 52
Last. Randi IngvaldsenH-Index: 26
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While sound scattering layers have been described previously from ice-covered waters in the Arctic, the existence of a viable mesopelagic community that also includes mesopelagic fishes in the Arctic has been questioned. In addition, it has been hypothesized that vertical migration would hardly exist in these areas. We wanted to check if deep scattering layers (DSLs) was found to the west and north of Svalbard (79°30’N - 82°10’N) during autumn 2015, and if present; whether organisms in such DSLs...
6 CitationsSource
#1Randi IngvaldsenH-Index: 26
#2Harald GjøsæterH-Index: 25
Last. Kathrine MichalsenH-Index: 19
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The Atlantic cod (Gadus morhua) is a highly adaptive demersal, boreal species with a broad distribution on the continental shelves on both sides of the North Atlantic. However, whether the species also uses adjoining deeper water basins as feeding grounds or migration corridors remain unknown. In this study, we aimed to describe the vertical and horizontal distributions of Atlantic cod observed feeding over the northern Fram Strait, between Greenland and Svalbard, and relate this to the prey fie...
5 CitationsSource
#1Elena EriksenH-Index: 10
#2Harald GjøsæterH-Index: 25
Last. Knut SunnanåH-Index: 6
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Abstract 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 collaboration between the Institute of Marine Research (IMR, Bergen) and the Knipovich Polar Research Institute of Marine Fisheries and Oceanography (PINRO, Murmansk) has been strengthened by developing and carrying out joint surveys. Monitoring changes in the Barents Se...
6 CitationsSource
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