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STOCK IDENTIFICATION METHODS WORKING GROUP (SIMWG; outputs from 2019 meeting) VOLUME 2 | ISSUE 7 ICES SCIENTIFIC REPORTS RAPPORTS SCIENTIFIQUES DU CIEM ICES INTERNATIONAL COUNCIL FOR THE EXPLORATION OF THE SEA CIEM CONSEIL INTERNATIONAL POUR L’EXPLORATION DE LA MER International Council for the Exploration of the Sea Conseil International pour l’Exploration de la Mer H.C. Andersens Boulevard 44-46 DK-1553 Copenhagen V Denmark Telephone (+45) 33 38 67 00 Telefax (+45) 33 93 42 15 www.ices.dk [email protected] The material in this report may be reused for non-commercial purposes using the recommended cita- tion. ICES may only grant usage rights of information, data, images, graphs, etc. of which it has owner- ship. For other third-party material cited in this report, you must contact the original copyright holder for permission. For citation of datasets or use of data to be included in other databases, please refer to the latest ICES data policy on ICES website. All extracts must be acknowledged. For other reproduction requests please contact the General Secretary. This document is the product of an expert group under the auspices of the International Council for the Exploration of the Sea and does not necessarily represent the view of the Council. ISSN number: 2618-1371 I © 2020 International Council for the Exploration of the Sea ICES Scientific Reports Volume 2 | Issue 7 STOCK IDENTIFICATION METHODS WORKING GROUP (SIMWG; outputs from 2019 meeting) Recommended format for purpose of citation: ICES. 2020. Stock Identification Methods Working Group (SIMWG; outputs from 2019 meeting). ICES Scientific Reports. 2:7. 93 pp. http://doi.org/10.17895/ices.pub.5960 Editor Lisa Kerr Authors Steve Cadrin • Helene De Pontual • Karin Hüssy • Lisa Kerr • Ken Mackenzie • Kelig Mahe • Stefano Mariani • Richard McBride • David Secor • Christoph Stransky • Zachary Whitener ICES | SIMWG 2019 | I Contents i Executive summary ....................................................................................................................... ii ii Expert group information ..............................................................................................................iii 1 Review recent advances in stock identification methods ............................................................. 1 2 Technical reviews and expert opinion on matters of stock identification .................................... 2 3 Review and report on advances in mixed stock analysis, and assess their potential role in improving precision of stock assessment .................................................................................. 3 Annex 1: List of participants............................................................................................................ 6 Annex 2: Resolutions ...................................................................................................................... 7 Annex 3: Responses to requests from ICES working groups ........................................................... 9 Annex 4: ToR a) Review recent advances in stock identification methods ................................... 10 Advances in Stock Identification Methods in 2017 ..................................................................... 10 Advances in Stock Identification Methods in 2018 ..................................................................... 27 Advances in Stock Identification Methods in 2019 ..................................................................... 50 Annex 5: ToR b) Provide technical reviews and expert opinions on matters of stock identification, as requested by specific Working Groups and SCICOM ......................... 76 Evaluation of European Sardine Stock Identity ........................................................................... 76 Evaluation of Beaked redfish stock affiliation on the East Greenland slope ............................... 82 Evaluation of Proposed Stock Identification Study on Cod in ICES area 6A ................................ 84 Evaluation of Red Gurnard Stock Identity ................................................................................... 87 II | ICES SCIENTIFIC REPORTS 2:7 | ICES i Executive summary The Stock Identification Methods Working Group (SIMWG) reviews new methods for the defi- nition and investigation of stock structure and provides guidance to other ICES expert groups on how to interpret patterns of population structure. Over the past three years, there has been a proliferation of applications of stock identification methods to ICES stocks, as well as several notable advances in stock identification methods with many results relevant to ICES science and advice. SIMWG provided annual updates on recent applications and advances in stock identification methods. Over the past three years, SIMWG received requests for guidance on stock structure of (1) European sardine (Sardina pilchardus), (2) Beaked redfish (Sebastes mentella) stock affiliation on the East Greenland slope, (3) Atlantic cod in ICES area 6a, and (4) red gurnard (Aspitrigla cuculus) stock structure in ICES subareas 3-8. These requests came from a range of ICES working groups including North Western Working Group (NWWG), the Workshop on Atlantic Sardine (WKSAR) and the Working Group on Widely Distributed Stocks (WGWIDE). SIMWG did not find sufficient evidence to support the recent change in stock structure of European sardine adopted in the 2017 benchmark and recom- mended review of new genetics research prior to the next benchmark. SIMWG did not recom- mend a combined assessment of beaked redfish along the east Greenland slope with the Icelandic slope. SIMWG reviewed and provided feedback on a proposed cod genetics study in ICES area 6a which promises to resolve some critical questions of stock identity of cod in ICES area 6a. SIMWG did not find strong evidence for splitting the red gurnard stock into two stock areas (North Sea/west of Scotland and Celtic Seas/Biscay). Over the past three years, SIMWG also made progress on reviewing and reporting on advances in mixed stock analysis. This work will continue through our next three year to and is relevant to resolving mixed stock composition issues in assessment and management. Understanding stock structure is a fundamental require- ment before any assessment or modelling on a stock can be contemplated and SIMWG will con- tinue to work with ICES expert groups to address pressing stock identification issues. ICES | SIMWG 2019 | III ii Expert group information Expert group name Stock Identification Methods Working Group (SIMWG) Expert group cycle Multiannual Year cycle started 2017 Reporting year in cycle 3/3 Chair Lisa Kerr, USA Meeting venue(s) and dates By correspondence in 2017 7-8 August 2018, Portland, USA By correspondence in 2019 ICES | SIMWG 2019 | 1 1 Review recent advances in stock identification methods Over the past three years, there has been a proliferation of applications of stock identification methods to ICES stocks, as well as several notable advances in stock identification methods with many results relevant to ICES science and advice. SIMWG has committed to providing annual updates on recent applications of stock identification methods to ICES species and on advances in stock identification methods. The group has focused on summarizing research in the focal areas listed below: • Genetics • Growth marks in calcified structures • Life history parameters • Morphometrics/meristics • Tagging • Otolith shape • Otolith chemistry • Parasites • Simulation approaches • Interdisciplinary approaches • Published Theme Sets SIMWG’s annual reviews on advances in stock identification methods keeps ICES members abreast of best practices in this field of study. This review activity has served as a valuable con- tribution to the field and has formed the foundational material for 2 editions of the book Stock Identification Methods: Applications in Fishery Science. This book was published first in 2005 and again in 2014. SIMWG members S. Cadrin, L. Kerr and S. Mariani edited the 2nd edition and several SIMWG members contributed chapters to this book. The details of annuals reviews of advances in stock identification methods are summarized in Annex 4. 2 | ICES SCIENTIFIC REPORTS 2:7 | ICES 2 Technical reviews and expert opinion on matters of stock identification SIMWG provides ICES expert groups and working groups expert feedback on questions of stock structure for ICES stocks. Over the past three years, SIMWG has contributed to ICES advisory needs by providing expert feedback on the status of stock structure of several species. These requests came from the North Western Working Group (NWWG), the Workshop on Atlantic Sardine (WKSAR), Working Group on Widely Distributed Stocks (WGWIDE), and in previous years we have connected with many more ICES groups to fulfill such requests. Over the past three years SIMWG provided expert recommendations on the following species: 1. European sardine (Sardina pilchardus); 2. Beaked redfish (Sebastes mentella) stock affiliation on the East Greenland slope; 3. Atlantic cod in ICES area 6a; 4. Red gurnard (Aspitrigla cuculus) stock structure in ICES subareas 3-8. The details of the reviews are summarized in Annex 4. SIMWG expert reviews on questions of stock structure for ICES stocks are directly relevant to the appropriate definition of stock and contribute to the accuracy of stock assessment and effec- tiveness of management actions. Understanding stock structure is a fundamental requirement before any assessment
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