Blar i Published in cooperation with others på forfatter "Nakken, Odd"
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The effects of IUU fishing (unreported catches) on stock assessments, predictions and management advice
Aglen, Asgeir; Nakken, Odd (IMR/PINRO joint report series, Conference object, 2005) -
The effects of IUU fishing on stock assessments, predictions and management advice [presentation]
Aglen, Asgeir; Nakken, Odd (IMR/PINRO Joint Report Series;2/2005, Conference object, 2005) -
The effects of IUU fishing on stock assessments, predictions and management advice [presentation]
Aglen, Asgeir; Nakken, Odd (IMR/PINRO Joint Report Series;2/2005, Conference object, 2005) -
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 ... -
Investigations on demersal fish in the Barents Sea winter 2000 : detailed report
Aglen, Asgeir; Drevetnyak, Konstantin; Jakobsen, Tore; Korsbrekke, Knut; Lepesevich, Yuri; Mehl, Sigbjørn; Nakken, Odd; Nedreaas, Kjell Harald (IMR/PINRO joint report series, Research report, 2001)A combined acoustic and bottom trawl survey to obtain indices of abundance and estimates of length and weight at age has been carried out each winter (4-6 weeks in January-March) since 1981 in the Barents Sea. The target ... -
Investigations on demersal fish in the Barents Sea winter 2003 : detailed report
Aglen, Asgeir; Alvsvåg, John; Halland, Tor Ivar; Høines, Åge S.; Nakken, Odd; Russkikh, Alexey; Smirnov, Oleg (IMR/PINRO joint report series, Research report, 2003)A combined acoustic and bottom trawl survey to obtain indices of abundance and estimates of length and weight at age has been carried out each winter (4-6 weeks in January-March) since 1981 in the Barents Sea. The target ... -
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 ... -
Maturation in North-East-Arctic Haddock.
Eikeseth, Helen; Nakken, Odd (ICES CM documents, Working paper, 1999)Maturation in north-east-arctic haddock was studied in relation to fish age; length, weight and condition factor using data from scientific surveys in 1989-1998. In order to investigate the reliability of the maturity ... -
Monitoring ecosystems using research surveys: Maximizing information and minimizing cost
Nakken, Odd; Pennington, Michael (ICES CM documents, Working paper, 2001)Indices or estimates of abundance generated by research vessel surveys are becoming ever more important for assessing marine resources. Most often survey abundance indices are used in conjunction with commercial catch data ... -
Monitoring ecosystems using research surveys; maximizing information and minimizing cost
Nakken, Odd; Pennington, Michael (ICES CM Documents;2002/J:5, Working paper, 2002)Indices or estimates of abundance generated by research vessel surveys are becoming ever more important for assessing marine resources. Most often survey abundance indices are used in conjunction with commercial catch data ... -
Mortality of herring during the larval stage
Dragesund, Olav; Nakken, Odd (ICES CM Documents;1968/Sy:4, Working paper, 1968) -
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) ... -
Norwegian investigations on young cod and haddock in the Barents Sea during the winter 1982
Dalen, John; Hylen, Arvid; Nakken, Odd; Randa, Kjell; Smedstad, Odd M. (ICES CM documents, Working paper, 1982)An acoustic survey and a bottom trawl survey were carried out in the Barents Sea during winter 1982. Both surveys showed that there has been a reduction in the total number of cod of about 50% and about 75% for haddock in ... -
On acoustic identification, sizing and abundance estimation of fish
Nakken, Odd; Midttun, Lars (ICES CM documents, Working paper, 1970) -
On the application of the echointegration method
Dalen, John; Nakken, Odd (ICES CM documents;1983/B:19, Working paper, 1983)The echo integration method used by the Institute of Marine Research is described. The model which are used to convert acoustic abundance indices into fish densities using length and species dependant conversion factors, ... -
On the geographical distribution of arctic cod in relation to the distribution of bottom temperatures in the Barents Sea, 1977-1984
Nakken, Odd; Raknes, Askjell (ICES CM documents, Working paper, 1984)The results from acoustic-trawl surveys in January-March were analysed together with observations of bottom temperatures at the same cruises. Distributions of fish abundance for each age group of cod on temperature were ...