Blar i Articles på forfatter "Krafft, Bjørn Arne"
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An Antarctic krill (Euphausia superba) hotspot: population characteristics, abundance and vertical structure explored from a krill fishing vessel
Krafft, Bjørn Arne; Skaret, Georg; Knutsen, Tor (Journal article; Peer reviewed, 2015-06-17) -
Antarctic krill (Euphausia superba) catch weight estimated with a trawl-mounted echosounder during fishing
Krafft, Bjørn Arne; Krag, Ludvig A.; Pedersen, Ronald; Ona, Egil; Macaulay, Gavin (Peer reviewed; Journal article, 2023)Reporting reliable catch weight estimates is important for all fisheries management. This study explores the potential for precise and direct estimation of catch weight (green weight) for the Antarctic krill (Euphausia ... -
Antarctic krill (Euphausia superba) exhibit positive phototaxis to white LED light
Krafft, Bjørn Arne; Krag, Ludvig Ahm (Peer reviewed; Journal article, 2021)The use of light-emitting diodes (LEDs) is increasingly used in fishing gears and its application is known to trigger negative or positive phototaxis (i.e., swimming away or toward the light source, respectively) for some ... -
Antarctic krill Euphausia superba: spatial distribution, abundance, and management of fisheries in a changing climate
McBride, Margaret; Stokke, Olav Schram; Renner, Angelika; Krafft, Bjørn Arne; Bergstad, Odd Aksel; Biuw, Martin; Lowther, Andrew; Stiansen, Jan Erik (Peer reviewed; Journal article, 2021)Antarctic krill Euphausia superba, a keystone species in the Southern Ocean, is highly relevant for studying effects of climate-related shifts on management systems. Krill provides a key link between primary producers and ... -
At-Sea Distribution and Prey Selection of Antarctic Petrels and Commercial Krill Fisheries
Descamps, Sebastien; Tarroux, Arnaud; Cherel, Yves; Delord, Karine; Godø, Olav Rune; Kato, Akiko; Krafft, Bjørn Arne; Lorentsen, Svein-Håkon; Ropert-Coudert, Yan; Skaret, Georg; Varpe, Øystein (Journal article; Peer reviewed, 2016-08-17)Commercial fisheries may impact marine ecosystems and affect populations of predators like seabirds. In the Southern Ocean, there is an extensive fishery for Antarctic krill Euphausia superba that is projected to increase ... -
Bycatch in the Antarctic krill (Euphausia superba) trawl fishery
Krafft, Bjørn Arne; Lowther, Andrew; Krag, Ludvig A. (Peer reviewed; Journal article, 2022)Bycatch of nontarget species can contribute to overfishing and slow efforts to rebuild fish stocks. Controlling bycatch is fundamental to sustainable fishing and maintaining healthy populations of target species. The ... -
Collecting size-selectivity data for Antarctic krill (Euphausia superba) with a trawl independent towing rig
Krag, Ludvig Ahm; Krafft, Bjørn Arne; Engås, Arill; Herrmann, Bent (Peer reviewed; Journal article, 2018)For the development of efficient trawls to minimize catch loss, escape mortality and potential negative ecosystem impacts from the fishery, the understanding about trawl selectivity processes are crucial. Small crustaceans ... -
Comparison of visual and molecular taxonomic methods to identify ichthyoplankton in the North Sea
Mateos-Rivera, Alejandro; Skern-Mauritzen, Rasmus; Dahle, Geir; Sundby, Svein; Mozfar, Bahar; Thorsen, Anders; Wehde, Henning; Krafft, Bjørn Arne (Peer reviewed; Journal article, 2020)The North Sea is an important spawning and nursery ground for many demersal and pelagic fishes whose spawning areas are largely overlapping in time and space. This makes ichthyoplankton visual identification from the various ... -
Distribution and biomass estimation of Antarctic krill (Euphausia superba) off the South Orkney Islands during 2011-2020
Skaret, Georg; Macaulay, Gavin; Pedersen, Ronald; Wang, X.; Klevjer, Thor A.; Krag, L.A.; Krafft, Bjørn Arne (Peer reviewed; Journal article, 2023)Antarctic krill is a key species in the Southern Ocean and subject to the most extensive fishery in the Antarctic. The Norwegian Institute of Marine Research has conducted acoustic-trawl monitoring of krill off the South ... -
Feeding Hotspots and Distribution of Fin and Humpback Whales in the Norwegian Sea From 2013 to 2018.
Løviknes, Sunniva; Jensen, Knut Helge; Krafft, Bjørn Arne; Anthonypillai, Valentine; Nøttestad, Leif (Peer reviewed; Journal article, 2021)Fin whales (Balaenoptera physalus) and humpback whales (Megaptera novaeangliae) are commonly found in the Norwegian Sea during the summer months. Records from around 1995 to 2004 show that their distribution patterns were ... -
Identifying seasonal distribution patterns of fin whales across the Scotia Sea and the Antarctic Peninsula region using a novel approach combining habitat suitability models and ensemble learning methods
Viquerat, Sacha; Waluda, Claire M.; Kennedy, Amy S.; Jackson, Jennifer A.; Hevia, Marta; Carroll, Emma L.; Buss, Danielle L.; Burkhardt, Elke; Thain, Scott; Smith, Patrick; Secchi, Eduardo R.; Santora, Jarrod A.; Reiss, Christian; Lindstrøm, Ulf Ove; Krafft, Bjørn Arne; Gittins, George; Dalla Rosa, Luciano; Biuw, Martin; Herr, Helena (Peer reviewed; Journal article, 2022)Following their near extirpation by industrial whaling of the 20th century, the population status of Southern Hemisphere fin whales (SHFW) remains unknown. Systematic surveys estimating fin whale abundance in the Southern ... -
Instrumentation and handling effects on Antarctic fur seals (Arctocephalus gazella)
Blanchet, Marie Ann; Lydersen, Christian; Biuw, Erik Martin; Bruin, N; Hofmeyr, Greg; Krafft, Bjørn Arne; Kovacs, Kit M. (Journal article; Peer reviewed, 2014-02-21)The use of biologging instruments has greatly improved our understanding of the behaviour, physiology and ecology of free-ranging marine mammals. However, handling wild animals and attaching instruments to streamlined ... -
Is current management of the Antarctic krill fishery in the Atlantic sector of the Southern Ocean precautionary?
Hill, Simeon L; Atkinson, Angus; Darby, Chris; Fielding, Sofie; Krafft, Bjørn Arne; Godø, Olav Rune; Skaret, Georg; Trathan, Philip; Watkins, John (Peer reviewed; Journal article, 2016) -
KRILLBASE: A circumpolar database of Antarctic krill and salp numerical densities, 1926-2016
Atkinson, Angus; Hill, Simeon L; Pakhomov, Evgeny A; Siegel, Volker; Anadon, Ricardo; Chiba, Sanae; Daly, Kendra L.; Downie, Rod; Fielding, Sophie; Fretwell, Peter T.; Gerrish, Laura; Hosie, Graham W; Jessopp, Mark J; Kawaguchi, So; Krafft, Bjørn Arne; Loeb, Valerie; Nishikawa, Jun; Peat, Helen J; Reiss, Christian S; Ross, Robin M; Quetin, Langdon B; Schmidt, Katrin; Steinberg, Deborah K; Subramaniam, Roshni C; Tarling, Geraint A.; Ward, Peter (Peer reviewed; Journal article, 2017) -
KRILLBASE: a circumpolar database of Antarctic krill and salp numerical densities, 1926-2016
Atkinson, Angus; Hill, Simeon L; Pakhomov, Evgeny A; siegel, volker; Anadon, Ricardo; Chiba, Sanae; Daly, Kendra L; Downie, Rod; Fretwell, Peter T.; Gerrish, Laura; Hosie, Graham W; Jessopp, Mark J; kawaguchi, so; Krafft, Bjørn Arne; Loeb, Valerie; Nishikawa, Jun; Peat, Helen J; Reiss, Christian S; Ross, Robin M; Quetin, Langdon B; Schmidt, Katrin; Steinberg, Deborah K; Subramaniam, Roshni C; Tarling, Geraint A.; Ward, Peter (Peer reviewed; Journal article, 2016) -
Physiological stress and recovery kinetics in trawl escapees of the Antarctic krill Euphausia superba Dana, 1850 (Euphausiacea)
Krag, Ludvig Ahm; Krafft, Bjørn Arne; Herrmann, Bent; Skov, Peter V. (Peer reviewed; Journal article, 2021)When caught in a trawl, some individuals interacting with the fishing gear may escape, but such interactions may lead to physiological trauma that causes direct delayed mortality and/or increased vulnerability to predation. ... -
Quantifying the Escape Mortality of Trawl Caught Antarctic Krill (Euphausia superba)
Krafft, Bjørn Arne; Krag, Ludvig Ahm; Engås, Arill; Nordrum, Sigve; Bruheim, Yngve; Herrmann, Bent (Journal article; Peer reviewed, 2016-09-13)Antarctic krill (Euphausia superba) is an abundant fishery resource, the harvest levels of which are expected to increase. However, many of the length classes of krill can escape through commonly used commercial trawl mesh ... -
Recent changes in distribution and relative abundance of cetaceans in the Norwegian Sea and their relationship with potential prey
Nøttestad, Leif; Krafft, Bjørn Arne; Anthonypillai, Valentine; Bernasconi, Matteo; Langård, Lise; Mørk, Herdis Langøy; Fernö, Anders (Journal article; Peer reviewed, 2015) -
Size selection of Antarctic krill (Euphausia superba) in a commersial codend and trawl body
Herrmann, Bent; Krag, Ludvig Ahm; Krafft, Bjørn Arne (Journal article; Peer reviewed, 2018)During fishing, many fish species are able to avoid the net walls of the trawl body and so the majority of size selection occurs in the codend of the net. Antarctic krill (Euphausia superba) are regarded as true planktonic ... -
Spatial structuring in early life stage fish diversity in the Scotia Sea region of the Southern Ocean
Dornan, Tracey; Knutsen, Tor; Krafft, Bjørn Arne; Kvalsund, Merete; Mateos-Rivera, Alejandro; Tarling, Geraint A.; Wienerroither, Rupert; Hill, Simeon L. (Peer reviewed; Journal article, 2023)The fish community of the Scotia Sea is diverse and plays key roles in Antarctic food webs and biogeochemical cycling. However, knowledge of the spatial and community structure of their early life stages is limited, ...