Blar i Brage IMR på forfatter "Handegard, Nils Olav"

Viser treff 41-60 av 81

    • Fitting observed fish trajectories to cathcability models 

      Handegard, Nils Olav (Conference object, 2010-09-08)

    • From siphonophores to deep scattering layers: Uncertainty ranges for the estimation of global mesopelagic fish biomass 

      Proud, Roland; Handegard, Nils Olav; Kloser, Rudy; Cox, Martin J.; Brierley, Andrew S. (Peer reviewed; Journal article, 2019)
      The mesopelagic community is important for downward oceanic carbon transportation and is a potential food source for humans. Estimates of global mesopelagic fish biomass vary substantially (between 1 and 20 Gt). Here, we ...

    • Guidelines towards an integrated ocean observation system for ecosystems and biogeochemical cycles 

      Claustre, Hervé; Antoine, David; Boehme, Lars; Boss, Emmanuel; D`Ortenzio, Fabrizio; D`Andon, Odile Fanton; Guinet, Christophe; Gruber, Nicolas; Handegard, Nils Olav; Hood, Maria; Johnson, Ken; Körtzinger, Arne; Lampitt, Richard; LeTraon, Pierre-Yves; Lequéré, Corinne; Lewis, Marlon; Perry, Mary-Jane; Platt, Trevor; Roemmich, Dean; Testor, Pierre; Sathyendranth, Shubba; Send, Uwe; Yoder, Jim (Journal article; Peer reviewed, 2009)
      The observation of biogeochemical cycles and ecosystems has traditionally been based on ship-based platforms. The obvious consequence is that the measured properties have been dramatically undersampled. Recent technological ...

    • Guidelines towards an integrated ocean observation system for ecosystems and biogeochemical cycles 

      Claustre, Hervé; Antoine, David; Boehme, Lars; Boss, Emmanuel; D`Ortenzio, Fabrizio; D`Andon, Odile Fanton; Guinet, Christophe; Gruber, Nicolas; Handegard, Nils Olav; Hood, Maria; Johnson, Ken; Körtzinger, Arne; Lampitt, Richard; LeTraon, Pierre-Yves; Lequéré, Corinne; Lewis, Marlon; Perry, Mary-Jane; Platt, Trevor; Roemmich, Dean; Testor, Pierre; Sathyendranth, Shubba; Send, Uwe; Yoder, Jim (Journal article; Peer reviewed, 2009)
      The observation of biogeochemical cycles and ecosystems has traditionally been based on ship-based platforms. The obvious consequence is that the measured properties have been dramatically undersampled. Recent technological ...

    • How to obtain clear images from in-trawl cameras near the seabed? A case study from the Barents Sea demersal fishing grounds 

      Tenningen, Maria; Rosen, Shale; Westergerling, Eugenie Heliana Taraneh; Handegard, Nils Olav (Peer reviewed; Journal article, 2023)
      Underwater camera systems are commonly used for monitoring fish and fishing gear behaviours. More recently, camera systems have been applied to scientific trawl surveys for improved spatial resolution and less invasive ...

    • 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)

    • Joint survey report for CRIMAC SFI and IMR sampling gear project 

      Handegard, Nils Olav; Tenningen, Maria (Toktrapport;2022 - 3, Research report, 2022)
      In this report we present main activities and preliminary results from the joint survey for the CRIMAC sfi and IMR sampling gear project. The survey was conducted on board RV G.O. Sars between 1. and 21. November and the ...

    • Korleis kan vi dokumentera at fisken overlever slipping frå not? 

      Handegard, Nils Olav; Tenningen, Maria (Havforskningsnytt;Nr. 7 - 2016, Working paper, 2016)

    • Lateral-aspect target strength measurements of in situ herring (Clupea harengus) 

      Pedersen, Geir; Handegard, Nils Olav; Ona, Egil (Journal article; Peer reviewed, 2009-07)
      Surveys of schooling herring with the new multi-beam sonar (Simrad MS70) pose new challenges when converting the echo energy to estimates of biomass. Since the sonar projects horizontally, data and models of lateral-aspect ...

    • Lateral-aspect target strength measurements of in situ herring (Clupea harengus) 

      Pedersen, Geir; Handegard, Nils Olav; Ona, Egil (Journal article; Peer reviewed, 2009-07)
      Surveys of schooling herring with the new multi-beam sonar (Simrad MS70) pose new challenges when converting the echo energy to estimates of biomass. Since the sonar projects horizontally, data and models of lateral-aspect ...

    • Machine intelligence and the data-driven future of marine science 

      Malde, Ketil; Handegard, Nils Olav; Eikvil, Line; Salberg, Arnt Børre (Peer reviewed; Journal article, 2019)
      Oceans constitute over 70% of the earth’s surface, and the marine environment and ecosystems are central to many global challenges. Not only are the oceans an important source of food and other resources, but they also ...

    • Machine Learning + Marine Science: Critical Role of Partnerships in Norway 

      Handegard, Nils Olav; Eikvil, Line; Jenssen, Robert; Kampffmeyer, Michael; Salberg, Arnt Børre; Malde, Ketil (Others, 2021)
      In this essay, we review some recent advances in developing machine learning (ML) methods for marine science applications in Norway. We focus mostly on deep learning (DL) methods and review the challenges we have faced in ...

    • Machine learning in marine ecology: an overview of techniques and applications 

      Rubbens, Peter; Brodie, Stephanie; Cordier, Tristan; Desto Barcellos, Diogo; DeVos, Paul; Fernandes-Salvador, Jose A; Fincham, Jennifer; Gomes, Alessandra; Handegard, Nils Olav; Howell, Kerry L.; Jamet, Cédric; Kartveit, Kyrre Heldal; Moustahfid, Hassan; Parcerisas, Clea; Politikos, Dimitris V.; Sauzède, Raphaëlle; Sokolova, Maria; Uusitalo, Laura; Van den Bulcke, Laure; van Helmond, Aloysius; Watson, Jordan T.; Welch, Heather; Beltran-Perez, Oscar; Chaffron, Samuel; Greenberg, David S.; Kühn, Bernhard; Kiko, Rainer; Lo, Madiop; Lopes, Rubens M.; Möller, Klas Ove; Michaels, William; Pala, Ahmet; Romagnan, Jean-Baptiste; Schuchert, Pia; Seydi, Vahid; Villasante, Sebastian; Malde, Ketil; Irisson, Jean-Olivier (Peer reviewed; Journal article, 2023)
      Machine learning covers a large set of algorithms that can be trained to identify patterns in data. Thanks to the increase in the amount of data and computing power available, it has become pervasive across scientific ...

    • Mackerel behaviour and seismic signals - a pilot net pen study 

      Sivle, Lise Doksæter; Hansen, Rune Roland; Karlsen, Hans Erik; Handegard, Nils Olav (Rapport fra Havforskningen;19-2016, Working paper, 2016-04-28)
      English: A pilot study to investigate behavioural changes induced by sound exposure for mackerel was conducted in October 2015 at Austevoll research station. The main objective was to test the experimental set up, and ...

    • Modeling fish reaction to vessel noise, the significance of the reaction thresholds 

      Handegard, Nils Olav; Ona, Egil (ICES CM documents, Working paper, 2001)
      A simple model of fish reaction to vessel noise is made. The fish are assumed to swim directly away from the noise source. The main noise source is assumed to be the propeller. Parameters for endurance and swimming speed ...

    • Noise Dose for Aquatic Animals: Preliminary Estimates for Two Seismic Surveys 

      Handegard, Nils Olav (Conference object, 2010-10)
      Two major air-gun exposure experiments have been conducted in Norwegian waters: The Nordkappbank experiment in 1992 [Can. J. Fish. Res. Aq. Sci., 1996, Vol. 53, pp. 2238-2249] and the Vesterålen experiment in 2009 [Fisken ...

    • Noise dose for aquatic animals: Preliminary estimates for two seismic surveys. (A) 

      Handegard, Nils Olav (Conference object, 2010-03)
      In humans, a daily noise dose is defined and used to regulate noise exposure in the working environment. This is an integrated measure of sound intensity over the working day, typically 8 h in duration. When investigating ...

    • Observing individual fish behavior in fish aggregations: Tracking in dense fish aggregations using a split-beam echosounder 

      Handegard, Nils Olav (Journal article; Peer reviewed, 2007)
      Acoustic instruments are important tools for observing the behavior of aquatic organisms. This paper presents a simple but efficient method for improving the tracking of closely spaced targets using a split-beam echosounder. ...

    • Observing school dynamics in situ using acoustics 

      Handegard, Nils Olav; Boswell, Kevin; LeBlanc, Simon; Couzin, Iain (Conference object, 2010-04)

    • Observing the behavioral response of herring exposed to mid-frequency sonar signals. (A) 

      Handegard, Nils Olav; Doksæter, Lise; Godø, Olav Rune; Kvadsheim, Petter H. (Conference object, 2010-03)
      There is general concern on how mid-frequency military sonars might affect aquatic animals. Approaches used to investigate possible effects on Norwegian spring spawning herring (Clupea harengus) are presented. Experiments ...