Browsing Brage IMR by Author "Bogstad, Bjarte"
Now showing items 41-60 of 143
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Do abiotic mechanisms determine interannual variability in length-at-age of juvenile Arcto-Norwegian cod?
Ottersen, Geir; Helle, Kristin; Bogstad, Bjarte (Journal article; Peer reviewed, 2002)For the large Arcto-Norwegian stock of cod (Gadus morhua L.) in the Barents Sea, year-to-year variability in growth is well documented. Here three hypotheses for the observed inverse relation between abundance and the mean ... -
Estimation of predation mortalities on capelin using a cod - capelin model for the Barents Sea
Bogstad, Bjarte; Tjelmeland, Sigurd (ICES CM Documents;1990/H:16, Working paper, 1990)The Barents Sea capelin stock collapsed during the period 1983-1986. One of the main factors causing the collapse was a rapid increase in consumption of capelin by cod. Based on measurements of stomach evacuation rates ... -
Evaluation of candidate management plans, with reference to North-East Arctic Cod
Skagen, Dankert W.; Bogstad, Bjarte; Sandberg, Per; Røttingen, Ingolf (ICES CM documents, Working paper, 2003)We here discuss the scope, nature and quality standards of simulation models that may be used in order to evaluate proposed or candidate management plans, including their parameters (reference points). A recently proposed ... -
Evaluation of maximum long-term yield for northeast Arctic cod
Kovalev, Yuri; Bogstad, Bjarte (IMR/PINRO Joint Report Series, Conference object, 2005) -
Evaluation of maximum long-term yield for northeast Arctic cod
Kovalev, Yuri; Bogstad, Bjarte (IMR/PINRO Joint Report Series, Conference object, 2005) -
Evaluation of maximum long-term yield for Northeast Arctic cod [presentation]
Kovalev, Yuri; Bogstad, Bjarte (IMR/PINRO Joint Report Series;2/2005, Conference object, 2005) -
Evaluation of maximum long-term yield for Northeast Arctic cod [presentation]
Kovalev, Yuri; Bogstad, Bjarte (IMR/PINRO Joint Report Series;2/2005, Conference object, 2005) -
An evaluation of recruitment indices for Northeast Arctic cod (Gadus morhua L.)
Helle, Kristin; Bogstad, Bjarte; Marshall, C. Tara; Michalsen, Kathrine; Ottersen, Geir; Pennington, Michael (ICES CM documents, Working paper, 1999)Indices of the abundance of Northeast Arctic cod (Gadus morhua L.) for various life stages were compared in order to determine the earliest stage at .which year-class strength is established. The indices considered are: ... -
An evaluation of the methodology for prediction of capelin biomass
Bogstad, Bjarte; Gjøsæter, Harald; Ushakov, N.G.; Prozorkevich, Dmitry (IMR/PINRO Joint Report Series, Conference object, 2005)The one-year prediction of capelin made as part of the assessment after the annual joint acoustic capelin survey during the autumn, is evaluated. Such predictions were made for the period from 1981 till present, and compared ... -
An evaluation of the methodology for prediction of capelin biomass
Bogstad, Bjarte; Gjøsæter, Harald; Ushakov, N.G.; Prozorkevich, Dmitry (IMR/PINRO Joint Report Series, Conference object, 2005)The one-year prediction of capelin made as part of the assessment after the annual joint acoustic capelin survey during the autumn, is evaluated. Such predictions were made for the period from 1981 till present, and compared ... -
An evaluation of the methodology for prediction of capelin biomass [presentation]
Bogstad, Bjarte; Gjøsæter, Harald; Ushakov, N.G.; Prozorkevich, Dmitry (IMR/PINRO Joint Report Series;2/2005, Conference object, 2005) -
An evaluation of the methodology for prediction of capelin biomass [presentation]
Bogstad, Bjarte; Gjøsæter, Harald; Ushakov, N.G.; Prozorkevich, Dmitry (IMR/PINRO Joint Report Series;2/2005, Conference object, 2005) -
Evaluation of the proposed harvest control rule for Northeast Arctic saithe: background, population model, parameters, data and preliminary analyses
Mehl, Sigbjørn; Fotland, Åge; Bogstad, Bjarte; Korsbrekke, Knut; Gjøsæter, Harald (Working paper, 2007) -
Feeding in a heterogeneous environment: spatial dynamics in summer foraging Barents Sea cod
Johannesen, Edda; Lindstrøm, Ulf; Michalsen, Kathrine; Skern-Mauritzen, Mette; Fauchald, Per; Bogstad, Bjarte; Dolgov, Andrey V. (Journal article; Peer reviewed, 2012-07-03)Cod Gadus morhua are important predators in many ecosystems in the North Atlantic, but their ecological importance has diminished in many areas due to stock size reductions. In contrast, the Barents Sea cod stock is ... -
Feeding of mature cod (Gadus morhua) on the spawning grounds in Lofoten
Michalsen, Kathrine; Johannesen, Edda; Bogstad, Bjarte (Journal article; Peer reviewed, 2008-03-19)Many authors state that cod (Gadus morhua) do not feed during the spawning period. However, this more or less established fact has rarely been investigated in the field. Here, the content of stomachs from Northeast Arctic ... -
Fish investigations in the Barents Sea winter 2007-2012
Mehl, Sigbjørn; Aglen, Asgeir; Bogstad, Bjarte; Dingsør, Gjert Endre; Gjøsæter, Harald; Johannesen, Edda; Korsbrekke, Knut; Staby, Arved; Wenneck, Thomas de Lange; Alexandrov, Dmitry I.; Murashko, Pavel A.; Prozorkevich, Dmitry; Smirnov, Oleg (IMR/PINRO Joint Report Series;1/2013, Research report, 2013) -
Fish investigations in the Barents Sea winter 2013-2014
Mehl, Sigbjørn; Aglen, Asgeir; Bogstad, Bjarte; Dingsør, Gjert Endre; Gjøsæter, Harald; Godiksen, Jane; Johannesen, Edda; Korsbrekke, Knut; Staby, Arved; Wenneck, Thomas de Lange; Wienerroither, Rupert; Murashko, Pavel A.; Russkikh, Alexey (IMR/PINRO Joint Report Series;2/2014, Research report, 2014) -
Fish investigations in the Barents Sea winter 2016
Mehl, Sigbjørn; Aglen, Asgeir; Bogstad, Bjarte; Dingsør, Gjert Endre; Korsbrekke, Knut; Olsen, Erik; Staby, Arved; Wenneck, Thomas de Lange; Wienerroither, Rupert; Amelkin, Aleksey; Russkikh, Aleksey (IMR/PINRO Joint Report Series;4/2016, Research report, 2016-09) -
Fish investigations in the Barents Sea winter 2017
Mehl, Sigbjørn; Aglen, Asgeir; Bogstad, Bjarte; Russkikh, Alexey A.; Staby, Arved; Wenneck, Thomas de Lange; Wienerroither, Rupert (IMR/PINRO Joint Report Series;, Research report, 2017)This report presents the main results from the surveys in January–March 2017. The surveys were performed with the Norwegian research vessels “Helmer Hanssen” and “G.O. Sars”. Annual survey reports since 1981 are listed in ... -
Fish Investigations in the Barents Sea Winter 2019
Mehl, Sigbjørn; Wenneck, Thomas de Lange; Aglen, Asgeir; Fuglebakk, Edvin; Gjøsæter, Harald; Godiksen, Jane Aanestad; Seim, Silje Elisabeth; Staby, Arved; Bogstad, Bjarte; Russkikh, Alexey A.; Fomin, Konstantin (IMR/PINRO Joint Report Series;, Research report, 2019)The Institute of Marine Research (IMR), Bergen, has performed acoustic measurements of demersal fish in the Barents Sea since 1976. Since 1981 a bottom trawl survey has been combined with the acoustic survey. Typical effort ...