• Advice on fishing opportunities for Barents Sea shrimp in 2023 

      Hvingel, Carsten; Zimmermann, Fabian (IMR/PINRO Joint Report Series;2023 - 2, Research report, 2023)
    • Advice on fishing opportunities for Barents Sea shrimp in 2024 

      Hvingel, Carsten; Zimmermann, Fabian (IMR/PINRO Joint Report Series, Research report, 2023)
    • Aktiv forvaltning av marine ressurser - Frøya og Hitra - Sluttrapport 

      Kleiven, Alf Ring; Espeland, Sigurd Heiberg; Søvik, Guldborg; Albretsen, Jon; Kleiven, Portia Joy Nillos; Zimmermann, Fabian; Grefsrud, Ellen Sofie; Halvorsen, Kim Aleksander Tallaksen; Vie, Ola (Rapport fra havforskningen;2021 - 14, Research report, 2021)
      Prosjektet ‘Aktiv forvaltning av marine ressurser- Frøya og Hitra’ ble formelt startet opp høsten 2017. Den overordnete målsetningen med prosjektet er å etablere en solid kunnskapsplattform for å sikre de marine verdiene ...
    • Barents Sea Shrimp - stock assessment report 2022/23 

      Hvingel, Carsten; Zimmermann, Fabian (IMR/PINRO Joint Report Series;2023 - 3, Research report, 2023)
      Since the 1980s, the Barents Sea has gone from a situation with high fishing pressure, cold conditions and low demersal fish stock levels, to the current situation with high levels of demersal fish stocks, reduced fishing ...
    • Barents Sea Shrimp - stock assessment report 2023 

      Hvingel, Carsten; Zimmermann, Fabian (IMR/PINRO Joint Report Series;2023 - 11, Research report, 2023)
    • Bestandskartlegging av haneskjell (Clamys islandica) ved Bjørnøya 

      Sundet, Jan Henry; Zimmermann, Fabian (Rapport fra havforskningen;2020 - 27, Research report, 2020)
      På bakgrunn av en bestilling fra Fiskeridirektoratet gjennomførte Havforskningsinstituttet en kartlegging av haneskjellressursene (Chlamys islandica) i Fiskevernsonen rundt Svalbard. Undersøkelsen ble konsentrert om områdene ...
    • Bestandsvurdering av kongekrabbe 2023 og råd for 2024 

      Hvingel, Carsten; Hjelset, Ann Merete; Fuhrmann, Mona Maria; Jenssen, Maria; Zimmermann, Fabian (Rapport fra havforskningen;2023 - 49, Research report, 2023)
    • Can less be more? Effects of reduced frequency of surveys andstock assessments 

      Zimmermann, Fabian; Enberg, Katja (Journal article; Peer reviewed, 2016-08-07)
      Uncertain and inaccurate estimates are a prevailing problem in stock assessment, despite increasingly sophisticated estimation methods and substantial usage of scientific and financial resources. Annual scientific surveys ...
    • Common trends in recruitment dynamics of north-east Atlantic fish stocks and their links to environment, ecology and management 

      Zimmermann, Fabian; Claireaux, Marion; Enberg, Katja (Journal article; Peer reviewed, 2019)
      Recruitment dynamics are challenging to assess or predict because of the many underlying drivers that vary in their relevance over time and space. Stock size, demographic and trait composition, condition and distribution ...
    • Considerations for management strategy evaluation for small pelagic fishes 

      Siple, Margaret; Koehn, Laura; Johnson, Kelli F; Punt, André E.; Canales, T. Mariella; Carpi, Piera; de Moor, Carryn L.; De Oliveira, José A.A.; Gao, Jin; Jacobsen, Nis S.; Lam, Mimi Elizabeth; Licandeo, Roberto; Lindgren, Martin; Ma, Shuyang; Óskarsson, Gudmundur Jóhann; Sanchez-Maroño, Sonia; Smolinski, Szymon; Surma, Szymon; Tian, Yongjun; Tommasi, Desiree; Gutierrez T., Mariano; Trenkel, Verena; Zador, Stephani; Zimmermann, Fabian (Peer reviewed; Journal article, 2021)
      Management strategy evaluation (MSE) is the state-of-the-art approach for testing and comparing management strategies in a way that accounts for multiple sources of uncertainty (e.g. monitoring, estimation, and implementation). ...
    • Density regulation in Northeast Atlantic fish populations: Density dependence is stronger in recruitment than in somatic growth 

      Zimmermann, Fabian; Ricard, Daniel; Heino, Mikko Petteri (Journal article; Peer reviewed, 2018)
    • Density-independent mortality at early life stages increases the probability of overlooking an underlying stock-recruitment relationship 

      Zimmermann, Fabian; Enberg, Katja; Mangel, Marc (Peer reviewed; Journal article, 2021)
      Abstract Beverton and Holt’s (1957) monograph contributed a widely used stock–recruitment relationship (BH-SRR) to fisheries science. However, because of variation around a presumed relationship between spawning biomass ...
    • Does size matter? A bioeconomic perspective on optimal harvesting when price is size-dependent 

      Zimmermann, Fabian; Heino, Mikko; Steinshamn, Stein Ivar (Journal article; Peer reviewed, 2011-09-09)
      Body size is a key parameter influencing demographic characteristics of fish populations as well as market value of landed catch. Yet in bioeconomic modelling, body size is often an overlooked biological and economic ...
    • Does size matter? A bioeconomic perspective on optimal harvesting when price is size-dependent 

      Zimmermann, Fabian; Heino, Mikko; Steinshamn, Stein Ivar (Journal article; Peer reviewed, 2011-09-09)
      Body size is a key parameter influencing demographic characteristics of fish populations as well as market value of landed catch. Yet in bioeconomic modelling, body size is often an overlooked biological and economic ...
    • Environmental drivers of herring growth and how the perception shifts with time series length 

      Claireaux, Marion; Zimmermann, Fabian; Ernande, Bruno; Heino, Mikko Petteri; Enberg, Katja (Peer reviewed; Journal article, 2022)
      Growth is a key component of population dynamics and, thus, fisheries management, yet drivers of its variations are often poorly understood. Using individual data collected over 80 years, we explored how environmental ...
    • Essay om fiskerier i Porsangerfjorden før og nå - et resultat av møter mellom fjordbrukere og forskere 

      Strand, Hans Kristian; Daleng, Jan; Eliassen, Tore; Follesø, Thor; Gjøsæter, Harald; Hansen, Hans Oliver; Hansen, Thomas; Johansen, Hartvig; Josefsen, Hedly; Larsen, Dagny; Martinsen, Terje; Nedreaas, Kjell Harald; Pedersen, Torstein; Skern-Mauritzen, Mette; Strand, Mette; Søvik, Guldborg; Zimmermann, Fabian (Rapport fra havforskningen;2020 - 41, Research report, 2020)
      Porsangerfjorden gikk fra å være en fiskerik fjord i første halvdelen av 1900-tallet, til en mye mer fiskefattig fjord i den andre halvdelen. Den fiskefattige tilstanden har vedvart fram til i dag. Den invaderende kongekrabben ...
    • Fine-scale diet data reveals spatial variation in predator-prey interactions in Norwegian fjords 

      Tengvall, Jessica; Søvik, Guldborg; Enberg, Katja; Lindstrøm, Ulf; Strand, Mette; Pedersen, Torstein; Strand, Hans Kristian; Zimmermann, Fabian (Dataset, 2024)
      We explored the diet composition of higher-trophic demersal fish (e.g., Atlantic cod) in three large fjord ecosystems in northern Norway, using spatially and taxonomically highly resolved data and geostatistical modelling. ...
    • Fine-scale spatial variation of northern shrimp and Atlantic cod across three Norwegian fjord systems and implications for management 

      Zimmermann, Fabian; Tengvall, Jessica; Strand, Hans Kristian; Nedreaas, Kjell Harald; Thangstad, Trude Hauge; Husson, Berengere; Søvik, Guldborg (Peer reviewed; Journal article, 2023)
      The spatial complexity of coastal ecosystems represents a challenge for the management of inshore resources. Here we compared two large fjord systems in northern Norway that have been closed for all bottom trawling for 50 ...
    • Highly mixed impacts of near-future climate change on stock productivity proxies in the North East Atlantic 

      Kjesbu, Olav Sigurd; Sundby, Svein; Sandø, Anne Britt; Alix, Maud; Hjøllo, Solfrid Sætre; Tiedemann, Maik; Skern-Mauritzen, Mette; Junge, Claudia; Fossheim, Maria; Broms, Cecilie; Søvik, Guldborg; Zimmermann, Fabian; Nedreaas, Kjell Harald; Eriksen, Elena; Höffle, Hannes; Hjelset, Ann Merete; Kvamme, Cecilie; Reecht, Yves; Knutsen, Halvor; Aglen, Asgeir; Albert, Ole Thomas; Berg, Erik; Bogstad, Bjarte; Durif, Caroline; Halvorsen, Kim Aleksander Tallaksen; Høines, Åge Sigurd; Hvingel, Carsten; Johannesen, Edda; Johnsen, Espen; Moland, Even; Myksvoll, Mari Skuggedal; Nøttestad, Leif; Olsen, Erik Joel Steinar; Skaret, Georg; Skjæraasen, Jon Egil; Slotte, Aril; Staby, Arved; Stenevik, Erling Kåre; Stiansen, Jan Erik; Stiasny, Martina H.; Sundet, Jan Henry; Vikebø, Frode Bendiksen; Huse, Geir (Peer reviewed; Journal article, 2021)
      Impacts of climate change on ocean productivity sustaining world fisheries are predominantly negative but vary greatly among regions. We assessed how 39 fisheries resources—ranging from data-poor to data-rich stocks—in the ...
    • Historic landings of northern shrimp (Pandalus borealis) in Norway - Data per county for 1908-2021 

      Melaa, Katrine Wilhelmsen; Zimmermann, Fabian; Søvik, Guldborg; Thangstad, Trude Hauge (Rapport fra havforskningen;2022 - 24, Research report, 2022)
      Time series of landed catches are often the only data source available that encompasses most or all of a fishery’s history, providing important information for stock assessment and fisheries management. Although landings ...