Blar i Brage IMR på forfatter "Krakstad, Jens-Otto"
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Acoustic observations of dusky dolphins Lagenorhynchus obscurus hunting Cape horse mackerel Trachurus capensis off Namibia
Bernasconi, Matteo; Nøttestad, Leif; Axelsen, Bjørn Erik; Krakstad, Jens-Otto (Journal article; Peer reviewed, 2011-05-16)Predator–prey interactions of mammals and their fish prey in marine ecosystems are rarely identified and recorded. We document for the first time the underwater behaviour of hunting dusky dolphins Lagenorhynchus obscurus ... -
Asynchronized spawning responses of small pelaigic fish to a short-term enviromental change
Tiedemann, Maik; Ndour, Ismaïla; Sow, Fambaye Ngom; Bagøien, Espen; Krakstad, Jens-Otto; Ostrowski, Marek; Stenevik, Erling Kåre; Ensrud, Tor Magne; Isari, Stamatina (Peer reviewed; Journal article, 2022)We provide substantial evidence on how short-term changes in environmental conditions activate and deactivate spawning activities in small pelagic fishes. An ichthyoplankton survey was conducted along the southernmost part ... -
Composition and diversity of larval fish in the Indian Ocean using morphological and molecular methods
Rathnasuriya, M.I.G.; Mateos-Rivera, Alejandro; Skern-Mauritzen, Rasmus; Wimalasiri, H.B.U.; Jayasinghe, R.P.P.K.; Krakstad, Jens-Otto; Dalpadado, Padmini (Peer reviewed; Journal article, 2021)Although vital in fisheries management, no comprehensive studies on ichthyoplankton have been conducted in Sri Lankan waters in the north central Indian Ocean hitherto. Hence, this study is the first detailed account of ... -
Distribution and Abundance of the Blue Whale (Balaenoptera musculus indica) off Sri Lanka during the Southwest Monsoon 2018
Kirumbara, Liyanage U. S. P.; Krishantha, Jayasinghe R. P. P.; Krakstad, Jens-Otto; Kanapathipillai, Arulananthan (Peer reviewed; Journal article, 2022)Blue whales Balaenoptera musculus are the most abundant and widely distributed cetacean species in Sri Lankan waters. A vessel-based opportunistic line transect survey focusing on marine mammals was conducted in Sri Lankan ... -
DNA barcoding confirms the first record of a Desmodema polystictum (Ogilby, 1898) egg and all-time high adult catches in the Indian Ocean.
Rathnasuriya, M.I.G.; Mateos-Rivera, Alejandro; Bandara, A.G.G.C.; Skern-Mauritzen, Rasmus; Jayasinghe, RP Prabath K; Krakstad, Jens-Otto; Dalpadado, Padmini (Peer reviewed; Journal article, 2019)The eggs of Polka-dot ribbonfish Desmodema polystictum have been recorded for the first time in the Indian Ocean. Although the only previous information on eggs from this species consists of line drawings from 1973 (Pacific ... -
Fisheries development co-operation: mapping of Norwegian competence
Krakstad, Jens-Otto; Klepsvik, J; Bakken, Erling; Erstad, H; Lundsør, Elisabeth (Working paper, 2006) -
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) -
Spatial dynamics of the bearded goby and its key fish predators off Namibia vary with climate and oxygen availability
Salvanes, Anne Gro V.; Bartholomae, Chris; Yemane, Dawit; Gibbons, Mark J.; Kainge, Paul; Krakstad, Jens-Otto; Rouault, Mathieu; Staby, Arved; Sundby, Svein (Journal article; Peer reviewed, 2015-02-06)Hypoxia [O2 < 2.0 mL L−1 (87 μmol kg−1)] and severely hypoxic water masses [O2 < 0.5 mL L−1 (21.8 μmol kg−1)] are increasing in coastal marine ecosystems due to eutrophication and warming. Here, we investigate the response ... -
Summer distribution and demography of Antarctic krill Euphausia superba Dana, 1852 (Euphausiacea) at the South Orkney Islands, 2011–2015
Krafft, Bjørn Arne; Knutson, T; Krag, Ludvig Ahm; Jensen, Knut Helge; Skaret, Georg; Krakstad, Jens-Otto; Larsen, Stuart; Melle, Webjørn Raunsgård; Iversen, Svein Arnholt; Godø, Olav Rune (Journal article; Peer reviewed, 2018)We carried out a survey of Antarctic krill (Euphausia superbaDana, 1850) from 2011 to 2015 to establish a long-term, time-series dataset of distribution, abundance, and demography for this species in the South Orkney Islands ...