Browsing Brage IMR by Author "Aanes, Sondre"

Age reading from Northeast Arctic cod otoliths through 50 years of history

Zuykova, N.V.; Koloskova, V.P.; Mjanger, Hildegunn; Nedreaas, Kjell Harald; Senneset, Harald; Yaragina, Natalia A.; Ågotnes, Per; Aanes, Sondre (IMR/PINRO Joint Report Series;5/2007, Conference object, 2007)

Age reading from Northeast Arctic cod otoliths through 50 years of history

Zuykova, N.V.; Koloskova, V.P.; Mjanger, Hildegunn; Nedreaas, Kjell Harald; Senneset, Harald; Yaragina, Natalia A.; Ågotnes, Per; Aanes, Sondre (IMR/PINRO Joint Report Series;5/2007, Conference object, 2007)

Age reading from Northeast Arctic cod otoliths through 50 years of history [presentation]

Zuykova, N.V.; Ågotnes, Per; Koloskova, V.P.; Mjanger, Hildegunn; Nedreaas, Kjell Harald; Senneset, Harald; Yaragina, Natalia A.; Aanes, Sondre (IMR/PINRO Joint Report Series;5/2007, Conference object, 2007)

Age reading from Northeast Arctic cod otoliths through 50 years of history [presentation]

Zuykova, N.V.; Ågotnes, Per; Koloskova, V.P.; Mjanger, Hildegunn; Nedreaas, Kjell Harald; Senneset, Harald; Yaragina, Natalia A.; Aanes, Sondre (IMR/PINRO Joint Report Series;5/2007, Conference object, 2007)

Age-dependent patterns of spatial autocorrelation in fish populations

Marquez, Jonatan; Sæther, Bernt-Erik; Aanes, Sondre; Engen, Steinar; Salthaug, Are; Lee, Aline Magdalena (Peer reviewed; Journal article, 2021)

The degree of spatial autocorrelation in population fluctuations increases with dispersal and geographical covariation in the environment, and decreases with strength of density dependence. Because the effects of these ...

Assessing the precision of the estimated age distribution of the commercial catch of Northeast Arctic cod

Aanes, Sondre; Pennington, Michael (ICES CM documents, Working paper, 2001)

The assessment of Northeast Arctic cod is based on estimates of the commercial catch numbers at age. The age structure of the catch is estimated by sampling individuals from commercial fishing trips. Though it is commonly ...

Catchability and the spatial distribution of fishing vessels

Salthaug, Are; Aanes, Sondre (Journal article; Peer reviewed, 2003)

A central problem when using commercial catch per unit effort (CPUE) as an index of fish stock abundance is that fishing vessels search for concentrations of fish. For a given stock abundance, CPUE may become high if ...

Caveats with estimating natural mortality rates in stock assessment models using age aggregated catch data and abundance indices

Aldrin, Magne Tommy; Aanes, Fredrik L; Tvete, Ingunn Fride; Aanes, Sondre; Subbey, Samuel (Peer reviewed; Journal article, 2021)

We consider the challenge in estimating the natural mortality, M, in a standard statistical fish stock assessment model based on time series of catch- and abundance-at-age data. Though anecdotal evidence and empirical ...

Cod, haddock, saithe, herring, and capelin in the Barents Sea and adjacent waters: a review of the biological value of the area

Olsen, Erik; Aanes, Sondre; Mehl, Sigbjørn; Holst, Jens Christian; Aglen, Asgeir; Gjøsæter, Harald (Journal article; Peer reviewed, 2009-10-09)

Cod, haddock, saithe, herring, and capelin are the most important fish species in the Barents Sea and adjacent waters. Ecosystem-based management requires species-specific knowledge of the biological value and vulnerability ...

Cod, haddock, saithe, herring, and capelin in the Barents Sea and adjacent waters: a review of the biological value of the area

Olsen, Erik; Aanes, Sondre; Mehl, Sigbjørn; Holst, Jens Christian; Aglen, Asgeir; Gjøsæter, Harald (Journal article; Peer reviewed, 2009-10-09)

Cod, haddock, saithe, herring, and capelin are the most important fish species in the Barents Sea and adjacent waters. Ecosystem-based management requires species-specific knowledge of the biological value and vulnerability ...

Estimating catch-at-age by combining data from different sources

Hirst, David; Storvik, Geir; Aldrin, Magne; Aanes, Sondre; Huseby, Ragnar Bang (Journal article; Peer reviewed, 2005)

Estimating the catch-at-age of commercial fish species is an important part of the quota-setting process for many different species and almost all countries with a fishing fleet. Current procedures are usually very ...

Estimating catch-at-age from market sampling data using a Bayesian hierarchical model

Hirst, David; Tvete, Ingunn Fride; Storvik, Geir; Aanes, Sondre (ICES CM documents, Working paper, 2001)

Estimation of the parameters of fish stock dynamics from catch-at-age data and indices of abundance: can natural and fishing mortality be separated?

Aanes, Sondre; Engen, Steinar; Sæther, Bernt-Erik; Aanes, Ronny (Journal article; Peer reviewed, 2007)

Models for fluctuations in size of fish stocks must include parameters that describe expected dynamics, as well as stochastic influences. In addition, reliable population projections also require assessments about the ...

Evaluation of sampling strategies for age determination of cod (Gadus morhua) sampled at the North Sea International Bottom Trawl Survey

Jourdain, Natoya; Breivik, Olav Nikolai; Fuglebakk, Edvin; Aanes, Sondre; Vølstad, Jon Helge (Peer reviewed; Journal article, 2020)

The North Sea cod stock assessment is based on indices of abundance-at-age from fishery-independent bottom trawl surveys. The age structure of the catch is estimated by sampling fish for otoliths collection in a length-stratified ...

Final report for the REDUS project - Reduced Uncertainty in Stock Assessment

Olsen, Erik Joel Steinar; Aanes, Sondre; Aldrin, Magne Tommy; Breivik, Olav Nikolai; Fuglebakk, Edvin; Goto, Daisuke; Handegard, Nils Olav; Hansen, Cecilie; Holmin, Arne Johannes; Howell, Daniel; Johnsen, Espen; Jourdain, Natoya; Korsbrekke, Knut; Ono, Kotaro; Otterå, Håkon Magne; Perryman, Holly Ann; Subbey, Samuel; Søvik, Guldborg; Umar, Ibrahim; Vatnehol, Sindre; Vølstad, Jon Helge (Rapport fra havforskningen;2021 - 16, Research report, 2021)

The REDUS project (2016-2020) has been a strategic project at the Institute of Marine Research (IMR) aimed at quantifying and reducing the uncertainty in data-rich and age-structured stock assessments (e.g., cod, herring, ...

Improving management decisions by predicting fish bycatch in the Barents Sea shrimp fishery

Aldrin, Magne; Mortensen, Bjørnar; Storvik, Geir; Nedreaas, Kjell Harald; Aglen, Asgeir; Aanes, Sondre (Journal article; Peer reviewed, 2011-11-20)

When the bycatch of juvenile fish within the Barents Sea shrimp fishery is too large, the area is closed to fishing for a certain period. Bycatch is estimated from sampled trawl hauls, for which the shrimp yield is recorded, ...

Joint PINRO/IMR report on the state of the Barents Sea ecosystem 2005/ 2006

Stiansen, Jan Erik; Aglen, Asgeir; Bogstad, Bjarte; Budgell, W. Paul; Dalpadado, Padmini; Dolgov, Andrey V.; Dommasnes, Are; Filin, Anatoly; Gjøsæter, Harald; Hauge, Kjellrun Hiis; Høines, Åge S.; Ingvaldsen, Randi; Johannesen, Edda; Jørgensen, Lis Lindal; Karsakov, A.L.; Klungsøyr, Jarle; Knutsen, Tor; Lien, Vidar S.; Loeng, Harald; Mehl, Sigbjørn; Buhl-Mortensen, Pål; Muchina, N.V.; Nesterova, V.N.; Olsen, Erik; Orlova, Emma L.; Ozhigin, Vladimir K.; Pedchenko, Andrey; Stenevik, Erling Kåre; Skogen, Morten D.; Titov, Oleg V.; Tjelmeland, Sigurd; Zabavnikov, V.B.; Ziryanov, S.V.; Zhukova, Nathalia; Øien, Nils; Aanes, Sondre (IMR/PINRO joint report series, Research report, 2006)