Blar i ICES CM documents authored by IMR scientists (1949-2011) på forfatter "Korsbrekke, Knut"
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Acoustic and Bottom Trawl Surveys; How Much Information Do They Provide for Assessing the Northeast Arctic Cod Stock?
Korsbrekke, Knut; Mehl, Sigbjørn; Nakken, Odd; Pennington, Michael (ICES CM documents, Working paper, 1999)Acoustic and bottom trawl surveys of the Northeast Arctic cod stock provide fishery independent estimates of trends in abundance and population characteristics. Given the recent uncertainties in the catch based assessment ... -
Can a bioenergetics model explain growth of the northeast Arctic cod?
Smedstad, Odd M.; Ajiad, Adnan Mosa; Korsbrekke, Knut (ICES CM Documents;1994/G:7, Working paper, 1994)For the period 1984 to 1991, the individual maximum daily consumption in calories (cmax) based on 33000 cod stomach samples is given by the power equation: Cmax = 68.84 · W ^0,934 where W represents the total fish ... -
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) -
Interactions between cod (Gadus morhua) and deep sea shrimp (Pandalus Borealis) in the Barents Sea
Korsbrekke, Knut; Mehl, Sigbjørn; Hylen, Arvid (ICES CM documents, Working paper, 1991)For some of the most important deep sea shrimp (Pandalus borealis) areas in the Barents Sea the content of shrimp in cod (Gadus morhua) stomachs during the first part of each year in the period 1984-1990 is analysed. Total ... -
Length and species dependent diurnal variation in catch rates in the Norwegian Barents Sea bottom trawl surveys
Korsbrekke, Knut; Nakken, Odd (ICES CM documents, Working paper, 1997)Diurnal variation in capture efficiency may add to the variability in swept area estimates (or indices) from bottom trawl surveys. In the present study the relationship between the day/night ratio of swept area estimates ... -
Limiting inter-annual variation in total allowable catch strategies. An application to ICES roundfish stocks
Kell, Laurence T.; Pilling, Graham; Kirkwood, Geoffrey P.; Pastoors, Martin; Abaunza, Pablo; Aps, Robert; Biseau, Alain; Korsbrekke, Knut; Kunzlik, Philip; Laurec, Alain; Mesnil, Benoit; Needle, Coby L.; Roel, Beatriz; Ulrich, Clara (ICES CM Documents;2003/X:7, Working paper, 2003)This study evaluated through simulation management strategy that stabilise catch levels by setting bounds on the inter-annual variability in Total Allowable Catches (TACs). An integrated modelling approach was used, which ... -
Minimalistic surveys clear the way for priorities in the ecosystem approach
Godø, Olav Rune; Hjellvik, Vidar; Tjøstheim, Dag; Korsbrekke, Knut (ICES CM documents;2009/I:20, Working paper, 2009)Standardized surveys are an integral part of most fish stock assessments. Ship time is expensive and new demands set by the ecosystem approach challenge present survey and sampling strategies with respect to coverage of ... -
Norwegian acoustic survey of North East Arctic cod on the spawning grounds off Lofoten
Korsbrekke, Knut (ICES CM Documents;1997/Y:18, Working paper, 1997)An acoustic survey of the spawning stock of North East Arctic Cod off Lofoten has been performed annually in March-April since 1982. The estimates for 1985-1997 have been recalculated and mean length and weight at age ... -
Norwegian combined acoustic and bottom trawl surveys for demersal fish in the Barents Sea during winter
Jakobsen, Tore; Korsbrekke, Knut; Mehl, Sigbjørn; Nakken, Odd (ICES CM documents, Working paper, 1997)A combined acoustic and bottom trawl survey for demersal fish in the Barents Sea has been conducted annually since 1981. The main aim is to map the spatial distribution and obtain indices of abundance (numbers at age) ... -
On subjectivity in the judging of acoustic records; comparison of degree of homogenity in allocation of echo values by different teams
Korsbrekke, Knut; Misund, Ole Arve (ICES CM Documents;1993/B:21, Working paper, 1993)On four fish abundance estimation surveys in the Barents Sea, january-february 1993, the acoustic records were judged by two independent teams. We have analyzed the degree of homogenity in allocation of echo values to ... -
Relationships between population spatial occupation and population dynamics
Woillez, Mathieu; Petitgas, Pierre; Rivoirard, Jacques; Fernandes, Paul G.; ter Hoftstede, Remment; Korsbrekke, Knut; Orlowski, Andrzej; Spedicato, Maria-Teresa; Politou, Chrissi-Yianna (ICES CM documents;2006/O:05, Working paper, 2006)Population dynamics is commonly described non-spatially using parameters of population demography and vital traits. Population spatial organisation is therefore considered implicit and its importance in the population ... -
Schooling-by-size in the Barents Sea capelin stock
Gjøsæter, Harald; Korsbrekke, Knut (ICES CM Documents;1990/D:28, Working paper, 1990)This paper analyses the biological samples of capelin taken by the Institute of Marine Research, Bergen, on annual stock assesment surveys in the Barents Sea from 1972 to 1989. The dependency between mean length of ... -
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 ... -
Types and frequency of malformations and mortality in eggs of Arcto-Norwegian cod: A field study
Makhotin, Valeri; Solemdal, Per; Korsbrekke, Knut; Salthaug, Are (ICES CM Documents;2001/N:12, Working paper, 2001)Embryological studies on living cod eggs in NUNC-trays showed that spontaneous malformations during embryo development are lethal. They are called natural egg mortality in contrast to external lethal factors, as ...