Blar i ICES CM documents authored by IMR scientists (1949-2011) på forfatter "Godø, Olav Rune"
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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 ... -
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- ... -
Results of investigations of migration pattern of artificially reared coastal cod (Gadus morhua L.) in western Norway
Svåsand, Terje; Godø, Olav Rune (ICES CM Documents;1987/F:26, Working paper, 1987)Investigations of the migration pattern have been a central part in an ongoing enhancement study of cod in western Norway. In Sept. - Nov. 1983, 20,947 juvenile, basin-reared cod fry were tagged and released at three sites ... -
Studying the relationship between spatial fish distributions and trawl catches
Trenkel, Verena M.; Godø, Olav Rune; Handegard, Nils Olav; Patel, Ruben (ICES CM Documents;2004/R:26, Working paper, 2004)We propose an approach for studying the relationship between spatial fish distributions and the distribution of numbers in trawl catches. Individual spatial fish distributions are derived from acoustics data collected with ... -
Swept area variation with depth and its influence on stratified trawl surveys indices on Arcto-Norwegian cod
Engås, Arill; Godø, Olav Rune (ICES CM Documents;1986/D:18, Working paper, 1986)Stratified trawl surveys have been carried out in the Barents Sea and the Svalbard areas since 1981. Based on the assumption of a constant area swept by the trawl during a standard trawl haul at any depth, swept area ... -
Tagging experiment results on cod in western Norway fjord areas
Godø, Olav Rune; Halland, Tor Ivar; Ågotnes, Per (ICES CM Documents;1986/G:80, Working paper, 1986)During recent years, experiments with large scale release of artificially produced Q-group cod at locations in western Norway waters have been carried out with the aim ofincreaseing the cod catches. As the general ... -
Testing various geostatistical models to combine bottom trawl catches and acoustic data
Bouleau, Mireille; Bez, Nicholas; Reid, David; Godø, Olav Rune; Gerritsen, Hans D. (ICES CM Documents;2004/R:28, Working paper, 2004)The aim of the CATEFA project is to combine information on demersal fish stock abundance from acoustic and bottom trawl surveys. While acoustic data are collected continuously while the research ship is underway, it is ... -
The effect of different sweep lengths on length composition of bottom sampling trawl catches
Engås, Arill; Godø, Olav Rune (ICES CM Documents;1987/B:16, Working paper, 1987)Abundance estimates of North-east Arctic cod and haddock are given annually on the basis of combined bottom trawl and acoustic surveys. Both survey methods use data from bottom trawl catches in the calculations. The ... -
The measurement error of marine survey catches: the bottom trawl case
Hjellvik, Vidar; Godø, Olav Rune; Tjøstheim, Dag (ICES CM Documents;2001/P:6, Working paper, 2001)We have formulated a model for analyzing the measurement error of marine survey abundance estimates using data from parallel surveys (trawl haul or acoustic measurement). The measurement error is defined as the component ... -
The use of data storage tags to study cod natural behaviour and availability to abundance surveys in the Barents Sea
Godø, Olav Rune; Michalsen, Kathrine (ICES CM Documents;1997/W:18, Working paper, 1997)Vertical movements of fish stocks can be studied by means of acoustic data from surveys, and diurnal related cycles in behaviour is often reported. To what extent the movements observed by this method reflect behaviour ... -
The use of transplantation-tagging-experiments in studies of migratory diversity of cod off Norway
Godø, Olav Rune; Korsbrekke, Knut; Soldal, Aud Vold; Totland, Atle (ICES CM Documents;1994/Mini:12, Working paper, 1994)Cod along the Norwegian coast show great variability in migration. Coastal Cod may be stationary for the whole life while mature Northeast Arctic Cod migrate long distances to reach the feeding areas in the Barents Sea ... -
Variations in the distribution of blue whiting in the Barents Sea: climatic influences or year class effects?
Heino, Mikko; Engelhard, Georg H.; Godø, Olav Rune (ICES CM documents, Working paper, 2003)Blue whiting (Micromesistius poutassou) in the Barents Sea represent the north-eastern fringe of the distribution of the species in the Atlantic. Distribution and abundance of blue whiting in the Barents Sea have fluctuated ...