Blar i ICES CM documents authored by IMR scientists (1949-2011) på forfatter "Nakken, Odd"
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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 ... -
Abundance estimation of the spawning Lofoten cod 1971
Nakken, Odd; Blindheim, Johan (ICES CM documents, Working paper, 1971) -
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 ... -
Acoustic estimates of spawning cod off Lofoten and Møre in 1982
Nakken, Odd; Godø, Olav Rune; Raknes, Askjell (ICES CM documents, Working paper, 1982)Acoustic surveys on spawning cod were carried out in Lofoten and off Møre in order to estimate the stock size and structure. The 1975 yearclass made up the bulk of the spawning stock in both areas. In the Lofoten area the ... -
Acoustic estimates of spawning cod off Lofoten and Møre in 1983
Nakken, Odd; Godø, Olav Rune; Raknes, Askjell (ICES CM documents, Working paper, 1983)Acoustic surveys on spawning cod were arried out in Lofoten and off Møre in order to estimate the stock size and structure. The 1975 year class made up the bulk of the spawning stock in both areas. In the Lofoten area the ... -
Acoustic estimates of spawning cod off Lofoten and Møre in 1984
Nakken, Odd; Godø, Olav Rune; Raknes, Askjell (ICES CM documents, Working paper, 1984)Acoustic surveys on northeast Arctic spawning cod were carried out in Lofoten and off Møre in March-April 1984 in order to estimate the stock size and structure. Within the investigated areas the total number at spawning ... -
Acoustic estimates of the Barents Sea capeling stock 1971-1976
Nakken, Odd; Dommasnes, Are (ICES CM documents, Working paper, 1977)The surveys were carried out in June and in August - October. No estimates were obtained for 0-group capelin. 1 year old capeling are grossly underestimated in June. To a lesser extent this is also the case for older ... -
Acoustic methods in studies of fish ecology
Nakken, Odd (ICES CM documents, Working paper, 1998)Systematic use of echo sounder in fisheries and marine science comrnenced in the 1930's and developed rapidly after World War II. During the 1950's and 1960's large scale echo surveys were carried out in many regions as a ... -
Ambient temperature and distribution of northeast arctic cod
Ottersen, Geir; Michalsen, Kathrine; Nakken, Odd (ICES CM documents, Working paper, 1996)Most studies on the effects of field temperature on fish distribution and population parameters have considered the temperature and its variability at fixed stations or sections rather than the temperature in the actual ... -
Application of acoustic stock abundance estimation on capelin and blue whiting
Nakken, Odd; Midttun, Lars (ICES CM documents, Working paper, 1972) -
The application of an echo integration system in investigations on the stock strength of the Barents Sea capelin (Mallotus Villosus, Müller) 1971-1974
Nakken, Odd; Dommasnes, Are (ICES CM documents, Working paper, 1975) -
Corrections of indices of abundance of 0-group fish in the Barents Sea for varying capture efficiency
Nakken, Odd; Raknes, Askjell (ICES CM documents, Working paper, 1996)Each year since 1965 "The International 0-group Survey in the Barents Sea and Adjacent Waters" has provided indices of abundance of 0-group fish. During the 30 years of operation of the survey large improvements in capture ... -
Counting of fish with an echo-integrator
Nakken, Odd; Midttun, Lars (ICES CM documents, Working paper, 1968) -
Distribution and abundance of 0-group Norway pout and haddock in the North Sea july - august 1978
Nakken, Odd; Rørvik, Carl Jakob (ICES CM documents, Working paper, 1979)In order to assess the 0-group abundance of Norway pout and haddock in the North Sea a combined acoustic/trawl survey was carried out in July - August 1978. The 0-group of both species were concentrated in a scattering ... -
Estimates of stock size of northeast arctic cod and haddock, Sebastes mentella and Sebastes marinus from survey data, winter 1989
Jakobsen, Tore; Mehl, Sigbjørn; Nakken, Odd; Nedreaas, Kjell Harald; Sunnanå, Knut (ICES CM documents, Working paper, 1989)The combined acoustic and bottom trawl survey in the Barents Sea in winter has been carried out since 1981. The target species are cod and haddock, but in recent years the redfish species Sebastes marinus and Sebastes ... -
Growth of northeast arctic cod in relation to ambient temperature
Michalsen, Kathrine; Ottersen, Geir; Nakken, Odd (ICES CM documents, Working paper, 1996)In the present study temperature related changes in horizontal distribution are described and the influence of temperature on the growth of Northeast Arctic cod is interpreted. Data from acoustic-and bottom trawl surveys ... -
In situ fish target strengths derived with a split-beam echo sounder
Nakken, Odd; Foote, Kenneth G.; Aglen, Asgeir (ICES CM documents, Working paper, 1985)In-situ target strengths of six fishes were determined with a split-beam echo sounder during cruises about Lofoten in March 1984 and the Shetland Islands in July 1984. The species and lengths, mean and standard deviation, ... -
Including climate into the assessment of future fish recruitment, using multiple regression models.
Stiansen, Jan Erik; Aglen, Asgeir; Bogstad, Bjarte; Loeng, Harald; Mehl, Sigbjørn; Nakken, Odd; Ottersen, Geir; Svendsen, Einar (ICES CM documents, Working paper, 2005)Climate variability has generally not been included in the assessment of fish stocks in the Barents Sea and Norwegian Sea. However, in recent years there has been a focus on implementing climate variability in the assessment ... -
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 ... -
Length dependant corrections of survey estimates of cod and haddock in the Barents Sea
Nakken, Odd; Aglen, Asgeir (ICES CM documents, Working paper, 1994)This paper describes an attempt to utilize new information on gear selectivity and fish target strength to improve time series of survey estimates. Swept area estimates and acoustic estimates of cod and haddock in the ...