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Benchmark workshop on herring (Clupea harengus) in the Gulf of Bothnia (WKCLuB 2021)

Cardinale, Massimiliano and Cerviño, Santiago and Gilljam, David and Hekim, Zeynep and Holmgren, Noél and Ianelli, Jim and Jounela, Pekka and Kaljuste, Olavi and Lilja, Juha and Lövgren, Johan and Orio, Alessandro and Pönni, Jukka and Pakarinen, Tapani and Raitaniemi, Jari (2021). Benchmark workshop on herring (Clupea harengus) in the Gulf of Bothnia (WKCLuB 2021). (NL, NJ) > Department of Aquatic Resources, Sveriges lantbruksuniversitet. ICES scientific reports ; 3:9
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Abstract

The assessment for the Gulf of Bothnia herring (SD 3031) in 2019 was not accepted by the Advice Drafting Group and was changed from category 1 to 3. The assessment was not accepted based on the poor retrospective diagnostics where the Mohn’s rho values were above 20% for SSB, F and recruitment. The aim for the Benchmark was to evaluate a new model, Stock Synthesis (SS3) as a candidate for the assessment of Gulf of Bothnia Herring SD30–31 in order to minimize the retrospective pattern previously observed. Following the path of the Benchmark data related issues were revealed. This led to a situation that the benchmark was prolonged one year in order to correct the data related issues. Apart from a misspecification in the model about how the trapnet index was used (abundance index vs. biomass index), the data problem had been related to the acoustic survey. The acoustic survey index used in the assessment was thoroughly examined by the Baltic international fish survey working group (WGBIFS) in a meeting in December 2020. A number of model runs (six prior to meeting, and an additional 16 during the benchmark) were conducted for evaluation at this benchmark. The analysis presented extensive diagnostic tests including the standard ICES criterion related to retrospective patterns. This was considered an enhancement over using one method for accepting or rejecting an assessment. It was noted that the final retrospective pattern had low and acceptable values of Mohn’s rho. In general, the benchmark using the stock synthesis platform with the settings specified during the benchmark are considered acceptable for assessment and advice and have features that should ensure stability as new data are added (e.g. selectivity is assumed to be constant over time).

Authors/Creators:Cardinale, Massimiliano and Cerviño, Santiago and Gilljam, David and Hekim, Zeynep and Holmgren, Noél and Ianelli, Jim and Jounela, Pekka and Kaljuste, Olavi and Lilja, Juha and Lövgren, Johan and Orio, Alessandro and Pönni, Jukka and Pakarinen, Tapani and Raitaniemi, Jari
Title:Benchmark workshop on herring (Clupea harengus) in the Gulf of Bothnia (WKCLuB 2021)
Series Name/Journal:ICES scientific reports
Year of publishing :2021
Number:3:9
Number of Pages:110
Publisher:International Council for the Exploration of the Sea
ISSN:2618-1371
Language:English
Publication Type:Report
Article category:Other scientific
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Fish and Aquacultural Science
URN:NBN:urn:nbn:se:slu:epsilon-p-110973
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-110973
Additional ID:
Type of IDID
DOI10.17895/ices.pub.5989
ID Code:22760
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Aquatic Resources
Deposited By: SLUpub Connector
Deposited On:15 Mar 2021 09:03
Metadata Last Modified:15 Mar 2021 09:11

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