Blar i Brage IMR på forfatter "Zimmermann, Fabian"
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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 ... -
Assessment report for northern shrimp (Pandalus borealis) in the Barents Sea (ICES Subareas 1 and 2)
Zimmermann, Fabian; Danielsen, Hanna Ellerine Helle; Marcussen, Johanna Bjånes; Trochta, John Tyler; Vickery, Georgina; Olsen, Siri Aaserud; Berg, Erik; Stesko, Aleksei; Bakanev, sergei (IMR/PINRO Joint Report Series;2024 - 13, Research report, 2024)Northern shrimp (Pandalus borealis) in the Barents Sea (ICES Subareas 1 and 2), including the Svalbard fishery protection zone (FPZ) and coastal shrimp along the Norwegian coast north of 62°N, is considered as one stock. ... -
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) -
Bestandsvurdering av kveite (Hippoglossus hippoglossus) i Norsk økonomisk sone (ICES-områder 1-4) i 2024
Zimmermann, Fabian; Berg, Erik; Larsen, Torfinn Erling; Vihtakari, Mikko (Rapport fra havforskningen;2024 - 39, Research report, 2024)Kveite (Hippoglossus hippoglossus) er en langtlevende flatfiskart med lang fiskerihistorie og høy økonomisk og kulturell verdi i Norge. Arten forekommer over store områder i norske farvann, men hovedtyngden av bestanden ... -
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 reveal spatial variation in predator–prey interactions in Norwegian fjords
Tengvall, Jessica; Søvik, Guldborg; Enberg, Katja; Lindstrøm, Ulf Ove; Strand, Mette; Pedersen, Torstein; Strand, Hans Kristian; Zimmermann, Fabian (Peer reviewed; Journal article, 2024)Predator–prey interactions in time and space determine stock productivity, making them an important consideration when managing marine resources, rebuilding stocks or considering reopening a fishery. We analysed fine-scale ... -
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. ...