Blar i Brage IMR på forfatter "Godø, Olav Rune"
-
Can subjective evaluation of echograms improve correlation between bottom trawl and acoustic densities?
Godø, Olav Rune; Hjellvik, Vidar; Greig, Tony; Beare, Douglas (ICES CM documents, Working paper, 2004)Direct comparison of acoustic densities and trawl catches involves fundamental difficulties related to species and size selectivity of the trawl and efficiency of the acoustic instrumentation. In some surveys, therefore, ... -
Can the precision of bottom trawl indices be increased by using simultaneously collected acoustic data? The Barents Sea experience
Hjellvik, Vidar; Godø, Olav Rune; Tjøstheim, Dag (ICES CM documents, Conference object, 2006) -
Can the precision of bottom trawl indices be increased by using simultaneously collected acoustic data? The Barents Sea experience
Hjellvik, Vidar; Tjøstheim, Dag; Godø, Olav Rune (Journal article; Peer reviewed, 2007-12)Acoustic data are recorded continuously during the winter survey for demersal fish in the Barents Sea. This paper presents a method for using the information from the acoustic recordings between trawl stations in an attempt ... -
Can the precision of bottom trawl indices be increased by using simultaneously collected acoustic data? The Barents Sea experience
Hjellvik, Vidar; Godø, Olav Rune; Tjøstheim, Dag (ICES CM documents, Conference object, 2006) -
Catchability of pelagic trawls for sampling deep-living nekton in the mid-North Atlantic
Heino, Mikko; Porteiro, Filipe M.; Sutton, Tracey T.; Falkenhaug, Tone; Godø, Olav Rune; Piatkowski, Uwe (Journal article; Peer reviewed, 2010-06-29)Material collected in summer 2004 from the Mid-Atlantic Ridge between Iceland and the Azores with three pelagic trawls was used to estimate relative catchabilities of common fish, cephalopod, decapod, and jellyfish species. ... -
Catchability of pelagic trawls for sampling deep-living nekton in the mid-North Atlantic
Heino, Mikko; Porteiro, Filipe M.; Sutton, Tracey T.; Falkenhaug, Tone; Godø, Olav Rune; Piatkowski, Uwe (Journal article; Peer reviewed, 2010-06-29)Material collected in summer 2004 from the Mid-Atlantic Ridge between Iceland and the Azores with three pelagic trawls was used to estimate relative catchabilities of common fish, cephalopod, decapod, and jellyfish species. ... -
Catfish - King of the sea
Godø, Olav Rune; Huse, Irene; Michalsen, Kathrine (ICES CM Documents;1995/B:16, Working paper, 1995)During an acoustic tagging experiment on cod in the Barents Sea in March 1995 a hierarchy between different fish species was revealed, and the catfish (Anarhichas sp.) was observed to be dominant in relation to cod and ... -
Changes in acoustic abundance - a signal indicatior for stock dynamics for cod (Gadus morhua)
Godø, Olav Rune; Ona, Egil (ICES CM documents, Working paper, 1999)To be able to take the proper and timely management actions, it is crucial to reliably defect major changes in trends of fish stock abundance. For the assessment of Northeast Arctic cod, the Norwegian bottom trawl survey ... -
Cod (Gadus morhua L.) off Møre - Composition and migration. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
Godø, Olav Rune (Flødevigen rapportserie, Conference object, 1984)Important spawning- as well as nursery- and feeding areas for cod, Gadus morhua L. are found off the Møre coast. In this paper age compositions, age at first spawninq, otolith patterns and migration of cod in the Møre ... -
Comparison between "underway" and "on station" acoustic measurements made during bottom trawl surveys
Nicolas, Bez; Mireille, Bouleau; Godø, Olav Rune; Armstrong, Mike; Gerritsen, Hans D.; Vérin, Yves; Massé, Jacques; Méhault, Sonia (ICES CM Documents;2002/J:3, Working paper, 2002)It becomes in many cases, routine, to collect acoustic data during bottom trawl surveys, both during and between trawls providing “on station” and “underway” acoustic data. Still, the combination of trawl and acoustic data ... -
Comparison of Northeast Atlantic mackerel (Scomber scombrus) distribution patterns in the Norwegian Sea using lidar, sonar, and trawl
Tenningen, Eirik; Godø, Olav Rune; Iversen, Svein A.; Slotte, Aril; Hjellvik, Vidar; Torkelsen, Terje (ICES CM documents, Working paper, 2003)In July 2002 the Institute of Marine Research (IMR), Bergen mapped the distribution and density of mackerel in the Norwegian Sea using lidar, sonar and trawl. A major objective was to test the efficiency of the lidar as ... -
Continental shelf-scale passive acoustic detection and characterization of diesel-electric ships using a coherent hydrophone array
Huang, Wei; Wang, Delin; Garcia, Heriberto; Godø, Olav Rune; Ratilal, Purnima (Peer reviewed; Journal article, 2017) -
Day / night variation in fish directivity in the trawl opening
Huse, Ingvar; Aglen, Asgeir; Engås, Arill; Godø, Olav Rune; West, Charles W. (ICES CM Documents;1994/B:18, Working paper, 1994)Still photographs of fish in the mouth area of a bottom trawl were taken by a downwards-oriented automated strobe camera mounted near the headrope. Fish angles relative to the towing direction were measured. Fish were ... -
Density dependent catchability in bottom trawl surveys
Aglen, Asgeir; Engås, Arill; Godø, Olav Rune; McCallum, Barry R.; Stansbury, Don; Walsh, Stephen J. (ICES CM Documents;1997/W:16, Working paper, 1997)Fish form schools, layer or patches in which the individual fish's behaviour is not independent of its neighbours movements. On the other hand, at low densities fish may have the freedom to act as single individuals ... -
Designing an Ocean Mid-trophic Automatic Acoustic Sampler (MAAS) - thoughts on how to include echo sounder observatories in ecosystem models
Handegard, Nils Olav; Domokos, Réka; Godø, Olav Rune; Jouanno, Julien; Kloser, Rudy; Lehodey, Patrick; Maury, Olivier; Senina, Inna (ICES CM documents;2009/I:21, Working paper, 2009)Echo sounders are a widely used tool for observing marine ecosystems. Traditionally, carefully designed surveys are used to integrate biomass to a global estimate, which is coupled to traditional stock assessment models. ... -
Designing an Ocean Mid-trophic Automatic Acoustic Sampler(MAAS) –thoughts on how to include echo sounder observatories in ecosystem models
Handegard, Nils Olav; Godø, Olav Rune; Kloser, Rudy; Lehodey, Patrick; Maury, Olivier (Conference object, 2010-02) -
Detecting Atlantic herring by parametric sonar
Godø, Olav Rune; Foote, Kenneth G.; Dybedal, Johnny; Tenningen, Eirik; Patel, Ruben (Journal article; Peer reviewed, 2010-03-17)The difference-frequency band of the Kongsberg TOPAS PS18 parametric sub-bottom profiling sonar, nominally 1–6 kHz, is being used to observe Atlantic herring. Representative TOPAS echograms of herring layers and schools ... -
Detection, Localization and Classification of Multiple Mechanized Ocean Vessels over Continental-Shelf Scale Regions with Passive Ocean Acoustic Waveguide Remote Sensing
Zhu, Chenyang; Garcia, Heriberto; Kaplan, Anna; Schinault, Matthew; Handegard, Nils Olav; Godø, Olav Rune; Huang, Wei; Ratilal, Purnima (Journal article; Peer reviewed, 2018)Multiple mechanized ocean vessels, including both surface ships and submerged vehicles, can be simultaneously monitored over instantaneous continental-shelf scale regions >10,000 km 2 via passive ocean acoustic waveguide ... -
Differences between near bottom biomass spatial structure observed in the Irish Sea, the North Sea and the Barents Sea in recent years
Mireille, Bouleau; Nicolas, Bez; Hjellvik, Vidar; Godø, Olav Rune; Reid, David; Beare, Douglas; Greig, Tony; Armstrong, Mike; Gerritsen, Hans D.; Mackinson, Steven; Neville, Suzanna; Kooij, Jeroen van der; Vérin, Yves; Massé, Jacques (ICES CM documents, Working paper, 2003)Based on acoustic data and trawl catches collected during bottom trawl surveys, we compare the spatial structure of the biomass available in the first meters above the bottom in three different regions, the Barents Sea ... -
Distribution of bioluminescence and plankton in a deep Norwegian fjord measured using an ISIT camera and the Digital Underwater Video Profiler
Bailey, David M.; Picheral, Marc; Jamieson, Alan J.; Godø, Olav Rune; Bagley, Philip M.; Gorsky, Gabriel (ICES CM documents;2007/F:02, Working paper, 2007)Bioluminescence and plankton profiles were obtained using a downward-looking ISIT low-light camera and the Underwater Video Profiler system in Sognefjord, Norway. The profiling systems were lowered by CTD wire and recorded ...