Browsing Brage IMR by Author "Krafft, Bjørn Arne"
Now showing items 1-20 of 49
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Acoustic manual for the krill synoptic survey in 2019
macaulay, gavin; Skaret, Georg; Knutsen, Tor; Bergstad, Odd Aksel; Krafft, Bjørn Arne (CCAMLR;WG-EMM-18/12, Research report, 2018)The previously presented document at the 2018 ASAM WG meeting (ASAM-18-07) described a design and plans for a synoptic krill acoustic survey in CCAMLR area 48 in 2019. The survey involves the collaborative efforts of Norway, ... -
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 (Conference object, 2016) -
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 and ecosystem monitoring survey at South Orkney Islands in 2016
Krafft, Bjørn Arne; Skaret, Georg; Krag, Ludvig Ahm; Rustand, Torborg; Pedersen, Ronald (Rapport fra havforskningen;20-2016, Research report, 2016)Small scaled Russian exploratory fishing for krill in the Southern Ocean began in the late 1960s. During the 1970s the fisheries increased and annual catches of krill have exhibited a number of fluctuations since the ... -
Antarctic krill and ecosystem monitoring survey off the South Orkney Islands in 2018
Krafft, Bjørn Arne; Skaret, Georg; Krag, Ludvig Ahm; Pedersen, Ronald (Rapport fra havforskningen;16-2018, Research report, 2018)Environmental monitoring along set transect lines off South Orkney Islands, Southern Ocean. Executed annual surveys (since 2011) to collect acoustic and biological data on krill, other macro zooplankton and data on krill ... -
Antarctic krill and ecosystem monitoring survey off the South Orkney islands in 2018
Krafft, Bjørn Arne; Skaret, Georg; Krag, Ludvig Ahm; Pedersen, Ronald (CCAMLR;WG-EMM-18/P03, Research report, 2018) -
Antarctic krill and ecosystem monitoring survey off the South Orkney Islands in 2023
Krafft, Bjørn Arne; Pedersen, Ronald; Zhang, Guosong; Menze, Sebastian; Rasmussen, Astrid Fuglseth; Skaar, Hege; Dale, Julian; Biuw, Martin; Oosthuisen, Chris; Lowther, Andrew (Toktrapport;2023 - 8, Research report, 2023)Environmental monitoring along 5 set transect lines off South Orkney Islands in the Southern Ocean have been carried out annually (since 2011) by the Institute of Marine Research, Norway. Data are used to calculate biomass ... -
Antarctic krill and ecosystem monitoring survey off the South Orkney Islands in 2024
Krafft, Bjørn Arne; Krag, Ludvig; Zhang, Guosong; Menze, Sebastian; Åsvestad, Linn; Rasmussen, Astrid Fuglseth; Lyngby, Mette Svantemann (Toktrapport;2024 - 14, Research report, 2024)Environmental monitoring along 5 set transects off South Orkney Islands in the Southern Ocean have been carried out annually (since 2011) by the Institute of Marine Research, Norway. Hydro-acoustic as well as net derived ... -
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 ... -
Assessment of Fish Spawning in the North Sea; Final Project Report of KINO-2, 2017–2021
Krafft, Bjørn Arne; Mateos-Rivera, Alejandro; Mozfar, Bahar; Skern-Mauritzen, Rasmus; Dahle, Geir; Sundby, Svein; Thorsen, Anders; Asplin, Lars; Wehde, Henning (Rapport fra havforskningen;2021 - 17, Research report, 2021)Increased and updated knowledge of reproductive strategies of fish is crucial to optimize the temporal and spatial planning for conducting seismic surveys; in order to reduce its potential negative ecosystems impacts. The ... -
Assessment of mortality of Antarctic krill (Euphausia superba) escaping from a trawl
Krafft, Bjørn Arne; Krag, Ludvig Ahm (Conference object, 2016) -
At-sea distribution and prey selection of Antarctic petrels and commercial 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 (CCAMLR;WG-EMM-16/P15, Conference object, 2016) -
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 ... -
Detection of growth zones in the eyestalk of the Antarctic krill Euphausia superba (Dana, 1852) (Euphausiacea)
Krafft, Bjørn Arne; Kvalsund, Merete; Søvik, Guldborg; Farestveit, Eva; Agnalt, Ann-Lisbeth (CCAMLR;WG-EMM-16/P02, Conference object, 2016) -
Development of methods relevant to feedback management (FBM) for the krill fishery
Krafft, Bjørn Arne; Lowther, Andrew; Macaulay, Gavin; Chierici, Melissa; Biuw, Martin; Renner, Angelika; klevjer, tor; Øyerhamn, Rune; cardenas, cecar; makhado, arata; Reiss, Christian; Bergstad, Odd Aksel (Research report, 2018)The primary objective for this project is to develop knowledge on the marine environment essential for the implementation of a Feed-Back Management (FBM) system. In terms of FBM, Marine Protected Area (MPA) development in ...