| Title: |
Benchmark workshop on mackerel and Norwegian spring-spawning herring (WKBMACNSSH) |
| Authors: |
Bartolino, Valerio; Bjarnason, Sigurvin; Björnsson, Höskuldur; Breivik, Olav Nikolai; Brunel, Thomas; Burns, Finlay; Campbell, Andrew; Carvalho, Goncalo; Cole, Harriet; Costas, Gersom; Dingsør, Gjert Endre; Dobby, Helen; Dominguez, Jose Cebrian; Egan, Afra; Eliasen, Solva Karadottir; Enberg, Katja; Farrell, Edward; Gatt, Ian; Molla Gazi, Karolina; Gonçalves, Patrícia; Hicks, Allan; Hintzen, Niels; Homrum, Eydna i; Howell, Daniel; Jacobsen, Jan Arge; Jansen, Teunis; Jonusas, Stanislovas; Korta, Maria; Kühn, Bernhard; Lam, Mimi Elizabeth; O’Leary, Carmel; Libungan, Lisa Anne; Mackinson, Steve; Malekiyourtchi, Yasaman; Miller, david; Murphy, Patrick; Nash, Richard; Nielsen, Anders; Nøttestad, Leif; O'Hea, Brendan; Ólafsdóttir, Anna; Ono, Kotaro; Orio, Alessandro; Oskarsson, Gudmundur J.; Paradinas, Josu; Peña, Hector; Perryman, Holly Ann; Pert, Campbell; Planque, Benjamin; Salthaug, Are; Slotte, Aril; Sparrevohn, Claus Reedtz; Stenevik, Erling Kåre; Surma, Szymon; Thomas, Paul; Trochta, John Tyler; Ulleweit, Jens |
| Publisher Information: |
ICES |
| Publication Year: |
2025 |
| Collection: |
OpenAgrar (Senat Bundesforschung, Bundesministeriums für Ernährung und Landwirtschaft) |
| Subject Terms: |
Text; Creative Commons Namensnennung – 4.0 International (CC BY 4.0); ddc:630; benchmark -- mackerel -- Scomber scombrus -- mac.27.nea -- herring -- Norwegian spring spawn herring -- clupea harengus -- her.27.1-24a514a |
| Description: |
WKBMACNSSH benchmark workshop on Mackerel (Scomber scombrus) in subareas 1–8 and 14 and Division 9.a (the Northeast Atlantic and adjacent waters) and Herring (Clupea harengus) in subareas 1, 2, 5 and divisions 4.a and 14.a, Norwegian spring-spawning herring (the Northeast Atlantic and Arctic Ocean) was conducted to refine input data, stock assessments and fisheries reference points. For mackerel, the benchmark group performed a comprehensive review and update of input data, including catch numbers and weight at age, as well as stock weights. The maturity ogive and natural mortality rates were revised, and RFID tagging data was reclassified as an abundance-at-age index. The egg survey data was investigated, though the DEPM estimates were deemed too short for reliable use at this point. The new assessment starts with catch data from 1998 and includes ages from 2 to 12+. The stock trends remain largely similar to previous assessment, but the revised stock estimates show a 60% increase in spawning stock biomass (SSB) and a 26% decrease in fishing mortality (Fbar) compared to previous assessments. These changes are largely due to revision of natural mortality parameters. The reference points were updated using EqSIM. For herring, the benchmark group incorporated an additional recruitment index and the RFID mark-recapture dataset, and refined survey data handling. The Norwegian spawning survey on NSS herring (NASF) was split into two time-series with different catchability and observation variance parameters. The MSY and precautionary approach reference points were revised, with Blim estimated using stock-recruitment pairs from 1988 to present. A custom-coded shortcut Management Strategy Evaluation (MSE) framework tailored to the biology of the stock, including density-dependent weight and maturity, was used for estimating FMSY. Advice based on the existing management plan for the Norwegian Spring-Spawning Herring is still considered precautionary, but the benchmark group strongly encourage conducting an MSE for this ... |
| Document Type: |
report |
| File Description: |
iv, 103 Seiten + Appendices |
| Language: |
English |
| Relation: |
https://doi.org/10.17895/ices.pub.29279615; https://www.openagrar.de/receive/openagrar_mods_00108229; https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00066497/dn069823.pdf |
| DOI: |
10.17895/ices.pub.29279615 |
| Availability: |
https://doi.org/10.17895/ices.pub.29279615; https://www.openagrar.de/receive/openagrar_mods_00108229; https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00066497/dn069823.pdf |
| Rights: |
public ; https://creativecommons.org/licenses/by/4.0/ ; info:eu-repo/semantics/openAccess |
| Accession Number: |
edsbas.6D18FAF7 |
| Database: |
BASE |