Browsing Brage IMR by Author "Fuglebakk, Edvin"

Now showing items 1-16 of 16

    • Detecting significant retrospective patterns in state space fish stock assessment 

      Breivik, Olav Nikolai; Aldrin, Magne Tommy; Fuglebakk, Edvin; Nielsen, Anders (Peer reviewed; Journal article, 2023)
      Retrospective patterns are commonly investigated to validate fish stock assessment models. A widely applied measure for retrospective bias is Mohn’s ρ and corresponding retrospective plots. However, retrospective patterns ...

    • Evaluating assumptions behind design-based estimators for unreported catches 

      Clegg, Thomas L; Fuglebakk, Edvin; Ono, Kotaro (Peer reviewed; Journal article, 2023)
      Understanding a fishery’s impact on the marine ecosystem requires a quantification of total catches, which include unreported catches. For recent years in Norwegian waters, unreported catches have been estimated using data ...

    • 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, ...

    • Fish Investigations in the Barents Sea Winter 2019 

      Mehl, Sigbjørn; Wenneck, Thomas de Lange; Aglen, Asgeir; Fuglebakk, Edvin; Gjøsæter, Harald; Godiksen, Jane Aanestad; Seim, Silje Elisabeth; Staby, Arved; Bogstad, Bjarte; Russkikh, Alexey A.; Fomin, Konstantin (IMR/PINRO Joint Report Series;, Research report, 2019)
      The Institute of Marine Research (IMR), Bergen, has performed acoustic measurements of demersal fish in the Barents Sea since 1976. Since 1981 a bottom trawl survey has been combined with the acoustic survey. Typical effort ...

    • Fish investigations in the Barents Sea winter 2020 

      Fall, Johanna Jennifer Elisabeth; Wenneck, Thomas de Lange; Bogstad, Bjarte; Fuglebakk, Edvin; Gjøsæter, Harald; Seim, Silje Elisabeth; Skage, Malin Lie; Staby, Arved; Tranang, Caroline Aas; Windsland, Kristin; Russkikh, Alexey A.; Fomin, Konstantin (IMR/PINRO Joint Report Series;, Research report, 2020)
      This report presents the main results from the surveys in January-March 2020. The surveys were performed with the Norwegian research vessels “Helmer Hanssen” and “Johan Hjort” and the Russian research vessel “Vilnyus”. ...

    • Fish investigations in the Barents Sea winter 2021 : IMR/PINRO Joint Report Series nr. 1 2022 

      Fall, Johanna Jennifer Elisabeth; Wenneck, Thomas de Lange; Bogstad, Bjarte; Fuglebakk, Edvin; Godiksen, Jane Aanestad; Korsbrekke, Knut; Seim, Silje Elisabeth; Skage, Malin Lie; Staby, Arved; Tranang, Caroline Aas; Windsland, Kristin; Russkikh, Alexey A.; Fomin, Konstantin (IMR/PINRO Joint Report Series;, Research report, 2022)
      This report presents the main results from the surveys in January-March 2021. The surveys were performed with the Norwegian research vessels “Helmer Hanssen”, “Kronprins Haakon” and “Johan Hjort”, and the Russian research ...

    • Fish investigations in the Barents Sea Winter 2022 

      Fall, Johanna Jennifer Elisabeth; Wenneck, Thomas de Lange; Bogstad, Bjarte; Fuglebakk, Edvin; Godiksen, Jane Aanestad; Høines, Åge Sigurd; Korsbrekke, Knut; Skage, Malin Lie; Staby, Arved; Tranang, Caroline Aas; Windsland, Kristin; Russkikh, Alexey A.; Kharlin, Sergey (IMR/PINRO Joint Report Series;2023 - 1, Research report, 2023)
      Annual catch quotas and other regulations of the Barents Sea fisheries are set through negotiations between Norway and Russia. Assessment of the state of the stocks and quota advice are based on survey results and international ...

    • Maturation in the Barents Sea capelin – Contrasting length- and gonad-based metrics 

      Jourdain, Natoya; Fuglebakk, Edvin; Subbey, Samuel (Peer reviewed; Journal article, 2021)
      It is assumed that maturation in the Barents Sea capelin is length-dependent, and that fish of at least 14 cm will potentially spawn. Current assessment and management models for the stock are based on this assumption of ...

    • A novel probabilistic survey method for at sea sampling in pelagic fisheries – the Norwegian catch sampling lottery 

      Otterå, Håkon Magne; Wathne, Jens A.; Fuglebakk, Edvin; Slotte, Aril; Svendsen, Bjørn Vidar; Vølstad, Jon Helge (Peer reviewed; Journal article, 2022)
      Reliable information on the age- and size-structure of the annual harvest of major commercial fish stocks is crucial input to analytical stock assessments. Such information is usually obtained from landing data (census of ...

    • A simulation approach to assessing bias in a fisheries self-sampling programme 

      Clegg, Tom; Fuglebakk, Edvin; Ono, Kotaro; Vølstad, Jon Helge; Nedreaas, Kjell Harald (Peer reviewed; Journal article, 2021)
      The hierarchical structure and non-probabilistic sampling in fisher self-sampling programmes makes it difficult to evaluate biases in total catch estimates. While so, it is possible to evaluate bias in the reported component ...

    • Skreitokt 2021 - Kartlegging av gytebestanden av skrei i 2021 

      Fuglebakk, Edvin; Thorsen, Anders (Toktrapport;2022 - 1, Research report, 2022)
      Toktnummer 2021204

    • Skreitokt 2022 - Kartlegging av gytebestanden av skrei i 2022 

      Fuglebakk, Edvin; Thorsen, Anders (Toktrapport;2022 - 10, Research report, 2022)
      Toktet dekket kystområdet fra 70° nord sørover til og med Røstbanken, samt Vestfjorden, og ga et mengdeanslag på 181 tusen tonn moden skrei (aldersgruppene eldre enn 5 år). Dette er noe lavere enn fjorårets resultat. ...

    • Skreitokt 2023 — Kartlegging av gytebestanden av skrei i 2023 

      Fuglebakk, Edvin; Thorsen, Anders (Toktrapport;2023 - 7, Research report, 2023)
      Toktet dekket kystområdet fra 70° nord sørover til og med Røstbanken, samt Vestfjorden, og ga et mengdeanslag på 128 tusen tonn moden skrei (aldersgruppene eldre enn 5 år). Dette er noe lavere enn de siste års resultat, ...

    • A “snowcrab-bag” attached to the fishing line of Campelen 1800 research trawl : Does it affect the catch rates and species composition in the cod end? 

      Aglen, Asgeir; Pavlenkov, Alexander; Hjelset, Ann Merete; Fuglebakk, Edvin; Engås, Arill (IMR/PINRO Joint Report Series;, Research report, 2019)
      For monitoring abundance and distribution of snow crab in the Barents Sea, data from the bottom trawl surveys in winter (February) and in autumn (August-September) are used. The data collected in the autumn survey is ...

    • StoX: An open source software for marine survey analyses 

      Johnsen, Espen; Totland, Atle; Skålevik, Åsmund; Holmin, Arne Johannes; Dingsør, Gjert Endre; Fuglebakk, Edvin; Handegard, Nils Olav (Journal article; Peer reviewed, 2019)
      Scientists across the globe conduct survey programs to monitor and characterize abundance, population structure, biodiversity and geographical distributions. To assess the state of marine fish and zooplankton, population ...