Browsing Brage IMR by Author "Bogstad, Bjarte"
Now showing items 1-20 of 94
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20th anniversary of the PINRO-IMR cooperation in the investigations of fish feeding in the Barents Sea: results and perspectives
Dolgov, Andrey V.; Yaragina, Natalia A.; Orlova, Emma L.; Bogstad, Bjarte; Johannesen, Edda; Mehl, Sigbjørn (IMR/PINRO Joint Report Series, Conference object, 2007)Since 1986 the Institute of Marine Research, (IMR), Norway and the Knipovich Polar Research Institute of Marine Fisheries and Oceanography (PINRO), Russia, have carried out a joint research program on the trophic relationships ... -
20th anniversary of the PINRO-IMR cooperation in the investigations of fish feeding in the Barents Sea: results and perspectives
Dolgov, Andrey V.; Yaragina, Natalia A.; Orlova, Emma L.; Bogstad, Bjarte; Johannesen, Edda; Mehl, Sigbjørn (IMR/PINRO Joint Report Series, Conference object, 2007)Since 1986 the Institute of Marine Research, (IMR), Norway and the Knipovich Polar Research Institute of Marine Fisheries and Oceanography (PINRO), Russia, have carried out a joint research program on the trophic relationships ... -
A review of the battle for food in the Barents Sea: cod vs. marine mammals
Bogstad, Bjarte; Gjøsæter, Harald; Haug, Tore; Lindstrøm, Ulf (Journal article; Peer reviewed, 2015-03-25)Cod, harp seal and minke whale are the main top predators in the Barents Sea ecosystem. In the last decade, the abundance of cod has increased considerably, and is at a record high level. In spite of this, the growth and ... -
Abundance and mortality of Northeast Arctic cod and haddock during their first years of life
Bogstad, Bjarte; Nakken, Odd; Eriksen, Elena; Marshall, C. Tara (ICES CM Documents;2010/C:04, Working paper, 2010)For Northeast Arctic cod and haddock in the Barents Sea, long time series of year-class abundance are available at several stages before they recruit to the fishery, i. e. before they reach age 3. Several studies have ... -
An evaluation of survey design for estimating the food consumption by fish
Bogstad, Bjarte; Pennington, Michael; Vølstad, Jon Helge (ICES CM Documents;1991/D:15, Working paper, 1991)The effect of survey design on the precision of estimates of average fish stomach contents is examined. The contribution to the total variance from within and between tow variability in stomach contents is evaluated, ... -
Balanced harvesting in a variable and uncertain world – a case study from the Barents Sea.
Howell, Daniel; Hansen, Cecilie; Bogstad, Bjarte; Skern-Mauritzen, Mette (Journal article; Peer reviewed, 2016-03-21) -
Barents Sea cod (Gadus morhua) diet composition: long-term interannual, seasonal, and ontogenetic patterns
Holt, Rebecca Emma; Bogstad, Bjarte; Durant, Joel Marcel; Dolgov, Andrey; Ottersen, Geir (Journal article; Peer reviewed, 2019)Atlantic cod (Gadus morhua) is an ecologically and commercially important species in the North-Atlantic region. Cod is a top predator and information on its trophic ecology is integral for understanding predator–prey ... -
Cannibalism and year-class strength in Atlantic cod (Gadus morhua L.) in Arcto-boreal ecosystems (Barents Sea, Iceland, and eastern Newfoundland)
Bogstad, Bjarte; Lilly, George R.; Mehl, Sigbjørn; Palsson, Olafur K.; Stefánsson, Gunnar (ICES Marine Science Symposia, Journal article; Peer reviewed, 1994)Stomach content data collected from cod caught during offshore resource assessment surveys in three Arcto-boreal ecosystems (the Barents Sea and the shelves off Iceland and eastern Newfoundland) were examined to determine ... -
Capelin distribution in winter 2004-2017: spatiotemporal correlation between density estimates from different sampling methods
Fall, Johanna Jennifer Elisabeth; Bogstad, Bjarte (Fisken og Havet;2019 - 3, Research report, 2019)The winter distribution of Barents Sea capelin is highly dynamic in space and time, as this is the time of year when mature individuals separate from the immatures and start their spawning migration to the Norwegian and ... -
CEC - a VPA for cod in the Barents Sea with cod - cod cannibalism
Skagen, Dankert W.; Bogstad, Bjarte; Mehl, Sigbjørn (Working paper, 1990) -
Changes in the relationship between sea temperature and recruitment of cod, haddock and herring in the Barents Sea
Bogstad, Bjarte; Dingsør, Gjert Endre; Ingvaldsen, Randi; Gjøsæter, Harald (Journal article; Peer reviewed, 2013-06-14)Cod, haddock and herring in the Barents Sea have strongly variable recruitment. For these three stocks, earlier studies have suggested a high correlation between their recruitment and a positive relationship between high ... -
Climate based multi-year predictions of the Barents Sea cod stock.
Årthun, Marius; Bogstad, Bjarte; Daewel, Ute; Keenlyside, Noel; Sandø, Anne Britt; Schrum, Corinna; Ottersen, Geir (Journal article; Peer reviewed, 2018)Predicting fish stock variations on interannual to decadal time scales is one of the major issues in fisheries science and management. Although the field of marine ecological predictions is still in its infancy, it is ... -
Climatic effects filtered through the food web affect the dynamics of Arcto-Norwegian cod
Hjermann, Dag Ø.; Eikeset, Anne Maria; Bogstad, Bjarte; Ottersen, Geir; Stenseth, Nils Christian (ICES CM documents, Working paper, 2005)The world's largest cod stock, the Arcto-Norwegian cod (a.k.a. North-East Arctic cod), is heavily influenced by temperature in two ways: First, cod recruitment tends to be high when Barents Sea temperature in the spawning ... -
A closed life-cycle model for Northeast Arctic cod
Bogstad, Bjarte; Howell, Daniel; Åsnes, Morten Nygaard (ICES CM documents, Working paper, 2004)For Northeast Arctic cod (Gadus morhua), there is much knowledge available concerning the main population dynamics processes (growth, maturation, fecundity, recruitment, natural mortality, fishing mortality). This knowledge ... -
Cod Consume Capelin
Johannesen, Edda; Johansen, Geir Odd; Bogstad, Bjarte; Mehl, Sigbjørn; Tjelmeland, Sigurd; Dolgov, Andrey V. (Working paper, 2006) -
Consumption of juvenile herring (Clupea harengus) by cod (Gadus morhua) in the Barents Sea: a new approach to estimating consumption in piscivorous fish
Johansen, Geir Odd; Bogstad, Bjarte; Mehl, Sigbjørn; Ulltang, Øyvind (Journal article; Peer reviewed, 2004)Consumption of different age groups of juvenile, Norwegian, spring-spawning herring (Clupea harengus) by northeast Arctic cod (Gadus morhua) in the Barents Sea in 1992–1997 is estimated using cod stomach content data. We ... -
The consumption rate of northeast arctic cod - a comparison of gastric evacuation models
Bogstad, Bjarte; Mehl, Sigbjørn (ICES CM documents, Working paper, 1990)The consumption rares in fish are important but also often weak points in multispecies models. In the Barents Sea multispecies model (MULTSPECI, as in many other models, quantltative stomach content data are combined ... -
Current patterns during pelagic stages determine interannual variability in length-at-age of juvenile Arcto-Norwegian cod
Ottersen, Geir; Helle, Kristin; Bogstad, Bjarte (ICES CM documents, Working paper, 2001) -
Daily rations of cod from the Barents Sea
Dolgov, Andrey V.; Yaragina, Natalia A.; Ajiad, Adnan Mosa; Mehl, Sigbjørn; Bogstad, Bjarte (PINRO-IMR Symposium, Conference object, 1992)Diurnal feeding rhythms and daily diets of the North-East Arctic cod were investigated based on data obtained at several stations made in the summer of 1988-1989. A well-pronounced feeding rhythmicity was recorded under ... -
Description of the Norwegian/Russian stomach data set
Bogstad, Bjarte; Mehl, Sigbjørn (Working paper, 1992)