Jan Horbowy
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View article: Effects of density dependence in growth and natural mortality on <i>F</i>MSY and maximum sustainable yield
Effects of density dependence in growth and natural mortality on <i>F</i>MSY and maximum sustainable yield Open
In fisheries management, it is generally assumed that density-dependent processes are confined to the pre-recruit stage of a fish. Consequently, current calculations of fishing mortality reference points include density dependence (DD) sol…
View article: Benchmark Workshop on Baltic Pelagic stocks (WKBBALTPEL)
Benchmark Workshop on Baltic Pelagic stocks (WKBBALTPEL) Open
Three pelagic stocks in the Baltic Sea, Central Baltic Herring (CBH; her.27.25-2932), Sprat (spr.27.22-32) and Gulf of Riga Herring (GOR, her 27.28) were examined during this benchmark. Work was prepared well in advance and 3 preparatory o…
View article: Workshop on the calculation and evaluation of new reference points for category 1–2 stocks (WKNEWREF)
Workshop on the calculation and evaluation of new reference points for category 1–2 stocks (WKNEWREF) Open
WKNEWREF is the third workshop of a series of meetings about reference points for category 1 and category 2 stocks being WKREF1 and WKREF2 the preceding ones. The goal of WKNEWREF was to put the recommendations of WKREF2 into practice to i…
View article: Workshop on ICES reference points (WKREF2)
Workshop on ICES reference points (WKREF2) Open
The ICES Workshop on ICES reference points (WKREF2) was tasked review the WKREF1 report and based on the outcome develop updated guidelines for the ICES reference points system and recommendations for ACOM consideration. The WKREF1 report …
View article: Corrigendum Estimating <i>F</i>msy from an ensemble of data sources to account for density dependence in Northeast Atlantic fish stocks
Corrigendum Estimating <i>F</i>msy from an ensemble of data sources to account for density dependence in Northeast Atlantic fish stocks Open
In the originally published version of this manuscript, a second affiliation was erroneously omitted from Co-author Rob van Gemert’s affiliation list. The full affiliation listing should read: 5DTU AQUA, Kemitorvet, Bygning 202, Kgs. Lyngb…
View article: Workshop of Fisheries Management Reference Points in a Changing Environment (WKRPChange, outputs from 2020 meeting)
Workshop of Fisheries Management Reference Points in a Changing Environment (WKRPChange, outputs from 2020 meeting) Open
WKRPChange was tasked with examining how ICES handles the estimation of target and limit reference points in the face of changing environmental conditions. In particular, the meeting par-ticipants were asked to review the robustness of the…
View article: Estimating <i>F</i>msy from an ensemble of data sources to account for density dependence in Northeast Atlantic fish stocks
Estimating <i>F</i>msy from an ensemble of data sources to account for density dependence in Northeast Atlantic fish stocks Open
A new approach for estimating the fishing mortality benchmark Fmsy (fishing pressure that corresponds to maximum sustainable yield) is proposed. The approach includes density-dependent factors. The analysis considers 53 data-rich fish stoc…
View article: Baltic Fisheries Assessment Working Group
Baltic Fisheries Assessment Working Group Open
The main objective of WGBFAS was to assess the status and produce a draft advice of the fol-lowing stocks:•Sole in Division 3.a, SDs 20–24 (catch advice)•Cod in Kattegat SD 21 (catch advice)•Cod in SDs 22–24 (catch advice)•Cod in SDs 24–32…
View article: Workshop on the Ecosystem-Based Management of the Baltic Sea 2020 Report
Workshop on the Ecosystem-Based Management of the Baltic Sea 2020 Report Open
The main objective was to identify important management issues and needs, to be carried out with stakeholders. This could include inter alia: mixed-fisheries interactions, ecosystem drivers of fisheries productivity and inter- and intra-sp…
View article: Tenth Workshop on the Development of Quantitative Assessment Methodologies based on LIFE-history traits, exploitation characteristics, and other relevant parameters for data-limited stocks
Tenth Workshop on the Development of Quantitative Assessment Methodologies based on LIFE-history traits, exploitation characteristics, and other relevant parameters for data-limited stocks Open
The Workshop on the Development of Quantitative Assessment Methodologies based on Life-history traits, exploitation characteristics, and other relevant parameters for data-limited stocks (WKLIFE X), chaired by Carl O'Brien (UK) and Manuela…
View article: Global fisheries catches can be increased after rebuilding of fish populations
Global fisheries catches can be increased after rebuilding of fish populations Open
Global fisheries catches can be increased in a sustainable way after rebuilding of fish populations, if ecosystem functioning is considered. A central biological reference point for fisheries management, Fmsy, the fishing pressure that giv…
View article: Report of the 2nd working group meeting on optimization of fishing pressure in the Northeast Atlantic, Vancouver November 2017
Report of the 2nd working group meeting on optimization of fishing pressure in the Northeast Atlantic, Vancouver November 2017 Open
Global fisheries catches can be increased in a sustainable way after rebuilding of fish populations, if ecosystem functioning is considered. A central biological reference point for fisheries management, Fmsy, the fishing pressure that giv…
View article: Report of the 3rd working group meeting on optimization of fishing pressure in the Northeast Atlantic, Rhode Island March 2018
Report of the 3rd working group meeting on optimization of fishing pressure in the Northeast Atlantic, Rhode Island March 2018 Open
Global fisheries catches can be increased in a sustainable way after rebuilding of fish populations, if ecosystem functioning is considered. A central biological reference point for fisheries management, Fmsy, the fishing pressure that giv…
View article: Report of the 1st working group meeting on optimization of fishing pressure in the Northeast Atlantic, Copenhagen June 2017
Report of the 1st working group meeting on optimization of fishing pressure in the Northeast Atlantic, Copenhagen June 2017 Open
Global fisheries catches can be increased in a sustainable way after rebuilding of fish populations, if ecosystem functioning is considered. A central biological reference point for fisheries management, Fmsy, the fishing pressure that giv…
View article: Model uncertainty and simulated multispecies fisheries management advice in the Baltic Sea
Model uncertainty and simulated multispecies fisheries management advice in the Baltic Sea Open
Different ecosystem models often provide contrasting predictions (model uncertainty), which is perceived to be a major challenge impeding their use to support ecosystem-based fisheries management (EBFM). The focus of this manuscript is to …
View article: Benchmark Workshop on Baltic Cod stocks (WKBALTCOD2)
Benchmark Workshop on Baltic Cod stocks (WKBALTCOD2) Open
The ICES Benchmark Workshop on Baltic Cod Stocks (WKBALTCOD2) met at ICES Headquarters in Copenhagen, Denmark on 4–8 February 2019, following a data evaluation workshop (Chair Johan Lövgren) and several preparatory web conference meetings.…
View article: Baltic Fisheries Assessemant Working Group (WGBFAS)
Baltic Fisheries Assessemant Working Group (WGBFAS) Open
The main objective of WGBFAS was to assess the status and produce a draft advice of the followingstocks:• Sole in Division 3.a, SDs 20–24• Cod in Kattegat, Cod in SDs 22–24, Cod in SDs 24–32• Herring in SDs 25–27, 28.2, 29 and 32• Herring …
View article: Extension of biomass estimates to pre-assessment periods using density dependent surplus production approach
Extension of biomass estimates to pre-assessment periods using density dependent surplus production approach Open
Biomass reconstructions to pre-assessment periods for commercially important and exploitable fish species are important tools for understanding long-term processes and fluctuation on stock and ecosystem level. For some stocks only fisherie…
View article: Integrated ecological–economic fisheries models—Evaluation, review and challenges for implementation
Integrated ecological–economic fisheries models—Evaluation, review and challenges for implementation Open
Marine ecosystems evolve under many interconnected and area‐specific pressures. To fulfil society's intensifying and diversifying needs while ensuring ecologically sustainable development, more effective marine spatial planning and broader…
View article: Effects of multispecies and density-dependent factors on MSY reference points: example of the Baltic Sea sprat
Effects of multispecies and density-dependent factors on MSY reference points: example of the Baltic Sea sprat Open
In this paper, maximum sustainable yield (MSY) parameters for the Baltic Sea sprat (Sprattus sprattus) are estimated in relation to pressure from cod (Gadus morhua) predation and the influence of density dependence on sprat growth. This st…
View article: Eastern Baltic cod in distress: biological changes and challenges for stock assessment
Eastern Baltic cod in distress: biological changes and challenges for stock assessment Open
The eastern Baltic (EB) cod (Gadus morhua) stock was depleted and overexploited for decades until the mid-2000s, when fishing mortality rapidly declined and biomass started to increase, as shown by stock assessments. These positive develop…