Browsing Brage IMR by Author "Godø, Olav Rune"
Now showing items 81-100 of 140
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Monitoring changes in abundance of gadoids with varying availability to surveys
Godø, Olav Rune; Wespestad, Vidar G. (ICES CM Documents;1991/G:76, Working paper, 1991)The use of scientific survey data for assessing abundance of commercially important fish stocks has become a managerial necessity in many regions. Errors and bias in estimates from such surveys may thus have great economic ... -
Natural fish behaviour and catchability of groundfish
Godø, Olav Rune (ICES CM Documents;1994/G:14, Working paper, 1994)Imprecision in estimates of abundance and population parameters obtained from trawl surveys could be reduced if the sources of variability were understood and properly described. Fish behaviour in relation to sampling ... -
Near-bottom sampling with bottom and pelagic trawls
Engås, Arill; Godø, Olav Rune (ICES CM Documents;1987/B:15, Working paper, 1987)The Institute of Marine Research, Bergen, has carried out combined bottom trawl and acoustic surveys for cod and haddock in the Barents Sea - Svalbard area since 1981. These investigations have demonstrated clearly that ... -
NORFISK - an ecosystem simulation model for studies of the fish stocks off the coast of Norway
Bax, Nicholas J.; Sunnanå, Knut; Godø, Olav Rune; Dragesund, Olav (ICES CM Documents;1984/B:25, Working paper, 1984)A biomass based ecosystem simulation model has been fitted to a restricted area of the Norwegian coastal waters. The model uses a holistic ecosystem approach and data on biomasses and their interaction with each other ... -
Observing behaviour of over-wintering Herring (Clupea harrengus L.) in Ofoten with Acoustic Current profiler
Patel, Ruben; Godø, Olav Rune; Lohrmann, Atle (ICES CM Documents;2003/Q:6, Working paper, 2003)In this paper we present results and interpretation of velocity and signal strength data collected with a ‘Continental’ Current Profiler on over-wintering herring in the Ofoten in the North of Norway. The instrument was ... -
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 ... -
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 ... -
Ocean Acoustic Waveguide Remote Sensing (OAWRS) of marine ecosystems
Jagannathan, Srinivasan; Bertsatos, Ioannis; Symonds, Deanelle; Chen, Tianrun; Nia, Hadi Tavakoli; Jain, Ankita Deepak; Andrews, Mark; Gong, Zheng; Nero, Redwood; Ngor, Lena; Jech, Mike; Godø, Olav Rune; Lee, Sunwoong; Ratilal, Purnima; Makris, Nicholas (Journal article; Peer reviewed, 2009-12-03)Ocean Acoustic Waveguide Remote Sensing (OAWRS) has recently been shown to be capable of instantaneously imaging and continuously monitoring fish populations over continental shelf-scale areas, covering thousands of km2. ... -
Overview of the EU fair project "STEREO" (Stock effects on recruitment relationships)
MacKenzie, Brian; Heath, Michael; Ådlandsvik, Bjørn; Backhaus, Jan O.; Bogstad, Bjarte; Gallego, Alejandro; Godø, Olav Rune; Gudmundsdottir, Asta; Harms, Ingo H.; Heilmann, J.P.; Jonsson, Sigurður; Kjesbu, Olav Sigurd; MacKenzie, Eddie; Marteinsdottir, Gudrun; Nielsen, Einar E.; Scott, Beth; Strugnell, G.; Stefánsson, Gunnar; Thorsen, Anders; Visser, Andre W.; Wright, Peter (ICES CM Documents;1999/Y:10, Working paper, 1999)The overall objective of the STEREO project is to improve the methodology for determining limit reference points for the biomass of exploited fish stocks. Limit reference points set boundaries which are intended to ... -
Positive relationships between bottom trawl and acoustic data
Beare, Douglas; Reid, David; Greig, Tony; Bez, Nicholas; Hjellvik, Vidar; Godø, Olav Rune; Bouleau, Mireille; Kooij, Jeroen van der; Neville, Suzanna; Mackinson, Steven (ICES CM documents, Working paper, 2004)Demersal fish stock biomass is usually estimated using commercial landings data, ‘tuned’ by various types of survey data, usually trawl. When collecting fish data by trawl it is only possible to take relatively small numbers ... -
Predicting recruitment of 0-group gadoids in the Barents Sea - critical interaction between models and observations
Johansen, Geir Odd; Skogen, Morten D.; Godø, Olav Rune; Torkelsen, Terje (ICES CM documents, Working paper, 2007)The most important gadoid fish stocks of the Barents Sea spawn along the coast of Norway. The eggs, larvae and juveniles are transported northwards with the oceanic coastal currents from the spawning grounds towards their ... -
Preliminary report of the Norwegian groundfish survey at Bear Island and west-Spitsbergen in the autumn 1983
Godø, Olav Rune; Randa, Kjell; Smedstad, Odd M. (ICES CM Documents;1984/G:46, Working paper, 1984)This report describes the results from a stratified bottom trawl survey carried out by R/V "Eldjarn" and M/Tr "Bøtrål 4" in the period 6 September to 1 October 1983. Cod were most abundant in the Bear Island area and ... -
Preliminary report of the Norwegian groundfish survey at Bear Island and west-Spitsbergen in the autumn 1984
Godø, Olav Rune (ICES CM Documents;1985/G:65, Working paper, 1985)This report describes the results from a stratified bottom trawl survey carried out in September/October 1984. The cod stock component was dominated by the 1982 and the 1983- year classes. The former most abundante ... -
Preliminary report of the Norwegian groundfish survey at Bear Island and west-Spitsbergen in the autumn 1985
Godø, Olav Rune; Nedreaas, Kjell Harald (ICES CM Documents;1986/G:81, Working paper, 1986)This report describes the results from a stratified bottom trawl survey carried out in September/October 1985. The cod stock was dominated by the 1982 and the 1983 year classes. Also the 1984 year class recruited ... -
Preliminary results of investigations on escapement of fish under the fishing line of a Norwegian sampling trawl
Engås, Arill; Godø, Olav Rune (ICES CM Documents;1986/B:30, Working paper, 1986)The Institute of Marine Research, Bergen, has carried out combined bottom trawl and acoustic surveys for cod and haddock in the Barents Sea and the Svalbard areas since 1981. These investigations have clearly demonstrated ... -
Probing the deep: Acoustic characterization of the Mid-Atlantic Ridge ecosystem
Horne, John K.; Anderson, Cairistiona I.H.; Godø, Olav Rune; Patel, Ruben (Journal article; Peer reviewed, 2006) -
The proceedings of the Soviet-Norwegian symposium on reproduction and recruitment of Arctic cod : Leningrad, 26-30 September 1983
Godø, Olav Rune; Tilseth, Snorre (PINRO-IMR Symposium;1, Research report, 1984) -
Quantification of wide-area norwegian spring-spawning herring population density with ocean acoustic waveguide remote sensing (OAWRS)
Duane, Daniel; Godø, Olav Rune; Makris, Nicholas C. (Peer reviewed; Journal article, 2021)Norwegian spring-spawning herring are a critical economic resource for multiple nations in the North Atlantic and a keystone species of the Nordic Seas ecosystem. Given the wide areas that the herring occupy, it is difficult ... -
Reaction norm analysis of fisheries-induced adaptive change and the case of the Northeast Arctic cod
Heino, Mikko; Dieckmann, Ulf; Godø, Olav Rune (ICES CM documents, Working paper, 2002)We present a probabilistic concept of reaction norms for age and size at maturation, and outline methods that can be used for their estimation in typical fisheries data. Such estimations are critical for calibrating size- ... -
Relationship between survey indices of recruitment and VPA abundance estimates for North-East Arctic cod
Godø, Olav Rune (PINRO-IMR Symposium, Conference object, 1995)Survey estimates of abundance of recruiting and partially recruited age groups are important elements for tuning the VPA of north-east Arctic cod, both for estimating the present state of the stock and for future ...