WG-SAM-2024 | Meetings

Working Group on Statistics, Assessments and Modelling

Location:

Leeuwarden, The Netherlands

Meeting Start Date/Time:

Monday, 24 June 2024

Meeting End Date/Time:

Friday, 28 June 2024

Submissions Due

Monday, 10 June 2024 - 09:00 Australia/Hobart (Working Group Paper)

Detailed information is available in our support forum, which includes the process for submitting papers and revisions.

Meeting Report:

WG-SAM-2024 Preliminary report.pdf (853.31 KB)

Meeting Documents

Documents

Document Number	Title	Agenda Item(s)
CCAMLR-42/18 More Info	On the status of the "best available scientific evidence" Delegation of the Russian Federation Abstract: Questions of establishing clear and transparent requirements for the term "best available scientific evidence" used under Article IX(f) of the CCAMLR Convention are discussed. The relevance and urgent need to clarify the scientific and legal aspects of the term "best available scientific evidence" arises from key aspects of the current CCAMLR agenda, most notably those Read More Submitted By: Dr Svetlana Kasatkina (Russian Federation) Approved By: Dr Svetlana Kasatkina (Russian Federation) Request Meeting Document	11
WG-SAM-2024/01 More Info	Agent-Based Model - Parameter perturbation analysis Thanassekos, S. Abstract: Following the recommendation by WG-SAM-2023 (paragraph 7.3(ii)), this paper presents a parameter perturbation analysis for the Agent-Based Model presented in WG-SAM-2023/17. This analysis provides a baseline response of the model which will be useful to assess the effects of changes to the model in the future. Submitted By: Dr Stéphane Thanassekos (CCAMLR Secretariat) Approved By: Ms Catherine Stubberfield (CCAMLR Secretariat) Request Meeting Document	6.2
WG-SAM-2024/02 More Info	Continuing research in the Dissostichus mawsoni exploratory fishery in East Antarctica (Divisions 58.4.1 and 58.4.2) from 2022/23 to 2025/26; Research plan under CM 21-02, paragraph 6(iii) Delegations of Australia, France, Japan, Republic of Korea and Spain Abstract: Exploratory fishing for Antarctic toothfish (Dissostichus mawsoni) in East Antarctica (Divisions 58.4.1 and 58.4.2) began in 2003. While preliminary integrated stock assessments have been developed for these Divisions, robust estimates of stock biomass and precautionary catch limits according to CCAMLR decision rules remain to be determined. Read More Submitted By: Dr Philippe Ziegler (Australia) Approved By: Dr Philippe Ziegler (Australia) Request Meeting Document	8.2
WG-SAM-2024/03 More Info	New research plan for Antarctic toothfish (Dissostichus mawsoni) under CM 24-01, paragraph 3 in Subarea 88.3 by Korea and Ukraine from 2024/25 to 2026/27 Delegations of the Republic of Korea and Ukraine Abstract: The stock structure of Antarctic toothfish (Dissostichus mawsoni) in Area 88 is being examined to understand stock boundaries for fishery management. It reveals ontogenetic progression in the Ross, Amundsen, and Bellingshausen Seas, with juveniles showing distinct distribution patterns. Korea Read More Submitted By: Dr Sangdeok Chung (Korea, Republic of) Approved By: Dr Jaebong Lee Request Meeting Document	7.2
WG-SAM-2024/04 More Info	New research plan for Antarctic toothfish (Dissostichus mawsoni) exploratory fishery in Statistical Subarea 48.6 from 2024/25-2027/28): Research Plan under CM21-02, paragraph 6(iii) Delegations of Japan, Republic of Korea, South Africa, and Spain Abstract: A collaborative research program for exploratory fishery has been undertaken by Japan and South Africa since 2013 to enhance data collection and analysis in the subarea 48.6 under CM 21-02. Spain joined the research program for exploratory fishery starting from 2018/19 fishing season in order to contribute to the data acquisition and to speed up the Read More Submitted By: Dr Takehiro Okuda (Japan) Approved By: Dr Takehiro Okuda (Japan) Request Meeting Document	7.1
WG-SAM-2024/05 More Info	Notification for the Ross Sea shelf survey in 2025: third year of an approved three year research plan. Research plan under CM 24-01, paragraph 3 - Continuing Research Delegation of New Zealand Abstract: The Ross Sea shelf survey has been conducted annually since 2012, with the most recent revised proposal presented in 2023 and spanning three years (2023–2025). This paper: serves as notification for the 2025 survey under CM 24-01 following the survey design proposed in WG-SAM-22/01 Rev. 1 and Read More Submitted By: Mr Nathan Walker (New Zealand) Approved By: Mr Nathan Walker (New Zealand) Request Meeting Document	8.3
WG-SAM-2024/06 More Info	New Fishery Research Proposal (Plan) Under CM 24-01, Paragraph 3, the Acoustic-Trawl Survey Champsocephalus gunnari in the Statistical Area 48.2 Delegation of Ukraine Abstract: Mackerel icefish (Champsocephalus gunnari) is one of the most common and widespread species of Antarctic fish. That is a proposal to conduct a local acoustic-trawl survey of Champsocephalus gunnari in the statistical Subarea 48.2, Read More Submitted By: Dr Kostiantyn Demianenko (Ukraine) Approved By: Dr Kostiantyn Demianenko (Ukraine) Request Meeting Document	7.2
WG-SAM-2024/07 More Info	2024 updated analysis of the sea ice concentration in research blocks 4(RB4), and 5(RB5) of Subarea 48.6 with sea surface temperature and winds and statistical analysis of repeated accessibility. Namba, T., R. Sarralde, K Teschke, H. Pehlke, T. Okuda, S. Somhlaba and J. Pompert Abstract: An analysis of the Sea Ice Concentration (SIC), Sea Surface Temperature (SST) and winds in Research Blocks (RBs) 48.6_5 and 48.6_4 is presented. The SICs in RB5 and RB4 from Jan to Mar 2024 were the lowest in the 2017-2024 period. A decreasing trend in SST spike sizes in Read More Submitted By: Mr Roberto Sarralde Vizuete (Spain) Approved By: Mr Roberto Sarralde Vizuete (Spain) Request Meeting Document	8.1
WG-SAM-2024/08 More Info	Evaluating a CPUE by seabed area analogy approach to estimate by-catch limits for macrourids in toothfish fisheries CCAMLR Secretariat Abstract: We review the applicability of the CPUE by seabed area analogy method for the estimation of bycatch limits for macrourids for toothfish fisheries in the Convention Area with limited macrourid data. We examine the assumed relationship between longline CPUE and macrourid survey biomass in the Ross Sea, macrourid selectivity by gear type, and the effect of Read More Submitted By: Dr Steve Parker (CCAMLR Secretariat) Approved By: Dr David Agnew (CCAMLR Secretariat) Request Meeting Document	4.3
WG-SAM-2024/09 More Info	ABM - Casal2 comparison of simple implementations Thanassekos, S. and A. Dunn Abstract: Following the recommendation by WG-SAM-2023 (paragraph 7.3(iii)), this paper presents comparisons of outputs between the Agent-Based Model presented in WG-SAM-2023/17 and Casal2. Starting from a baseline simulation, additional complexity was incrementally added to the models. Results show that the ABM and Casal2 produce the same outcomes when using the same assumptions and the same population Read More Submitted By: Dr Stéphane Thanassekos (CCAMLR Secretariat) Approved By: Ms Catherine Stubberfield (CCAMLR Secretariat) Request Meeting Document	6.2
WG-SAM-2024/10 More Info	Updates to Observer and Vessel forms and manuals for Longline Fisheries CCAMLR Secretariat Abstract: This paper notes additions to both observer and vessel longline forms and manuals for introduction in the 2025 season, related to recommendations endorsed by the Scientific Committee in 2023. The inclusions cover additional skate injury fields as part of the Ross Sea Data Collection Plan, and more detailed tagging information and protocols developed during WS-TAG-2023. Submitted By: Mr Isaac Forster (CCAMLR Secretariat) Approved By: Dr David Agnew (CCAMLR Secretariat) Request Meeting Document	4.2
WG-SAM-2024/11 More Info	An updated method for the extrapolation of IMAF and warp strikes CCAMLR Secretariat. Abstract: Following feedback from WG-IMAF-2023 on the draft IMAF and warp strikes extrapolation method presented in WG-IMAF-2023/03 Rev. 1, this paper presents an updated method. The update includes definitions of observation effort for extrapolation purposes, a change to the way IMAF observation effort on board trawlers is calculated, and a proposed method to estimate uncertainty in extrapolated Read More Submitted By: Dr Stéphane Thanassekos (CCAMLR Secretariat) Approved By: Ms Mariana Cordeiro (CCAMLR Secretariat) Request Meeting Document	9
WG-SAM-2024/12 More Info	2024 provisional trend analysis: preliminary estimates of toothfish biomass in Research Blocks CCAMLR Secretariat Abstract: Preliminary biomass estimates for research blocks in data-limited toothfish fisheries and the resulting preliminary catch limits for the 2025 season have been determined using the trend analysis decision rules. The resulting preliminary catch limits are for illustrative purposes only and do not constitute recommendations. Submitted By: Dr Stéphane Thanassekos (CCAMLR Secretariat) Approved By: Ms Mariana Cordeiro (CCAMLR Secretariat) Request Meeting Document	6.2
WG-SAM-2024/13 More Info	Progress report on the joint research for Dissostichus spp. in area 88.3 by Republic of Korea and Ukraine in 2024 Delegations of the Republic of Korea and Ukraine Abstract: The scientific research fishing was conducted by the vessels “Greenstar” (KOR) and “Marigolds” (UKR) in CCAMLR Subarea 88.3 following the survey design (WG-FSA-2022/26). The total catch of Dissostichus mawsoni was 73020.7 kg comprising 3747 individuals. The CPUE for D. mawsoni varied among the research blocks; CPUE demonstrated high variability in research blocks 88.3_1, 88.3_3 and 88.3_4 with Read More Submitted By: Mr Illia Slypko (Ukraine) Approved By: Dr Kostiantyn Demianenko (Ukraine) Request Meeting Document	8.3
WG-SAM-2024/14 More Info	Draft report of the co-conveners of the 2nd CCAMLR Ageing Determination Workshop (WS-ADM2) Devine, J., P. Hollyman and C. Brooks Abstract: This is a draft report prepared for WG-SAM. A final report will be prepared for WG-FSA. Submitted By: Mr Nathan Walker (New Zealand) Approved By: Mr Nathan Walker (New Zealand) Request Meeting Document	5.2
WG-SAM-2024/15 More Info	An introduction to management strategies and harvest control rules Dunn, A., P. Ziegler, S. Alewijnse, J. Devine, T. Earl, R. Le Clech, D. Maschette, C. Masere, F. Massiot-Granier, F. Ouzoulias, C. Péron, L. Readdy and N. Walker Abstract: Management strategies provide a more predictable approach than the traditional use of stock assessments to provide scientifically-based fisheries management advice. The effectiveness of management strategies relies on an agreed set of agreed management objectives for the fishery and the stock, and then using Management Strategy Evaluation (MSE, also known Read More Submitted By: Dr Philippe Ziegler (Australia) Approved By: Dr Philippe Ziegler (Australia) Request Meeting Document	6
WG-SAM-2024/16 More Info	Development of U-based harvest control rules for assessed toothfish fisheries - 1. Background Ziegler, P., A. Dunn, S. Alewijnse, J. Devine, T. Earl, R. Le Clech, D. Maschette, C. Masere, F. Massiot-Granier, F. Ouzoulias, C. Péron, L. Readdy and N. Walker Abstract: CCAMLR has a well-established framework to determine precautionary toothfish catch limits based on the CCAMLR Decision Rules. In recent years, CCAMLR has discussed the Decision Rules for toothfish and how they could be improved in determining catch limits for the assessed toothfish fisheries. Specifically, discussions have centred on how the Decision Rules Read More Submitted By: Dr Philippe Ziegler (Australia) Approved By: Dr Philippe Ziegler (Australia) Request Meeting Document	6.1
WG-SAM-2024/17 More Info	Development of U-based harvest control rules for assessed toothfish fisheries - 2. Exploration of U-based HCRs Ziegler, P., A. Dunn, S. Alewijnse, J. Devine, T. Earl, R. Le Clech, D. Maschette, C. Masere, F. Massiot-Granier, F. Ouzoulias, C. Péron, L. Readdy and N. Walker Abstract: In this paper, we use simulations based on operating models using the most recent (2023) toothfish stock assessments in the Ross Sea region, Subarea 48.3, Division 58.5.1 and Division 58.5.2 to evaluate a range of harvest control rules (HCRs) which were based on harvest rates Read More Submitted By: Dr Philippe Ziegler (Australia) Approved By: Dr Philippe Ziegler (Australia) Request Meeting Document	6.1
WG-SAM-2024/19 More Info	Evaluating the Feasibility of Pot Fishing for Toothfish in the Ross Sea Plum, B., H. Tijsen, A. Berry and N. Walker Abstract: New Zealand intends to conduct a trial employing pots to catch toothfish (Dissostichus spp.) in the Ross Sea (88.1) in the 2025 season. The objective of this trial is to assess the feasibility of pot fishing in this region. Specifically, the trial aims to investigate the effectiveness of pot Read More Submitted By: Mr Nathan Walker (New Zealand) Approved By: Mr Nathan Walker (New Zealand) Request Meeting Document	8.3
WG-SAM-2024/20 More Info	CCAMLRTOOLS - an R package for working with CCAMLR data extracts CCAMLR Secretariat Abstract: Following advice by WG-SAM 2023 regarding the tag-overlap calculation method, the Secretariat published the public R package `CCAMLRTOOLS`, which contains an easy-to-use function to calculate the overlap statistic from the standard CCAMLR data extract. Additional functions can be added to this package upon request by Members. Submitted By: Mr Daphnis De Pooter (CCAMLR Secretariat) Approved By: Ms Mariana Cordeiro (CCAMLR Secretariat) Request Meeting Document	11
WG-SAM-2024/21 More Info	A progress update on the 2024 Ross Sea shelf survey Devine, J., C.D. Jones and N.A. Walker Abstract: The time series of relative abundance and age structure from the Ross Sea shelf survey provides information about year class strength, variability, and autocorrelation, and hence is an important input into the Ross Sea region toothfish stock assessment. This was the thirteenth survey in the time series and for the first time, the 2024 survey was not Read More Submitted By: Mr Nathan Walker (New Zealand) Approved By: Mr Nathan Walker (New Zealand) Request Meeting Document	8.3
WG-SAM-2024/22 More Info	Consideration of the impact of tagging and recapture effort on mark-recapture abundance estimators within integrated Casal2 stock assessments Masere, C., R. Le Clech, S. Alewijnse, J. Devine, A. Dunn, T. Earl, D. Maschette, F. Massiot-Granier, F. Ouzoulias, C. Péron, L. Readdy, N. Walker and P. Ziegler Abstract: The exploration of changes in spatial and temporal change in fishing and tagging effort provides important context for the interpretation and evaluation of M-R estimates derived from the Chapman estimator. In particular, the evaluation encourages a wider discussion of the compatibility of the data sets that have been collected in assessment areas in Read More Submitted By: Mr Nathan Walker (New Zealand) Approved By: Mr Nathan Walker (New Zealand) Request Meeting Document	5.1
WG-SAM-2024/23 More Info	Approaches to projecting recruitment in toothfish assessment models Earl, T., L. Readdy, S. Alewijnse, J. Devine, A. Dunn, R. Le Clech, D. Maschette, C. Masere, F. Massiot-Granier, F. Ouzoulias, C. Péron, N. Walker, and P. Ziegler Abstract: The current CCAMLR toothfish Decision Rules to determine catch limits for assessed toothfish fisheries are based on a stock projection forward for 35 years from the most recent year included in the assessment. As a result, the outcomes rely heavily on recruitment assumptions as the stock and catch at the end of the projection period will be dominated by Read More Submitted By: Mr Nathan Walker (New Zealand) Approved By: Mr Nathan Walker (New Zealand) Request Meeting Document	5.1
WG-SAM-2024/24 More Info	Consideration of the impact of tagging and recapture effort on mark-recapture abundance estimators within integrated Casal2 stock assessments – supplementary material Masere, C., R. Le Clech, S. Alewijnse, J. Devine, A. Dunn, T. Earl, D. Maschette, F. Massiot-Granier, F. Ouzoulias, C. Péron, L. Readdy, N. Walker, and P. Ziegler Abstract: This document is a selected summary of some of the analyses, tests and results which were undertaken to explore patterns of fishing and tagging effort over time as presented in the primary document (Masere et al. 2024). The inclusion of this material is intended to not only provide support for the findings presented in the main paper yet also as a Read More Submitted By: Mr Nathan Walker (New Zealand) Approved By: Mr Nathan Walker (New Zealand) Request Meeting Document	5.1
WG-SAM-2024/25 More Info	Effects of implementing dynamic B0 in toothfish fisheries Ouzoulias, F., F. Massiot-Granier, S. Alewijnse, J. Devine, A. Dunn, T. Earl, R. Le Clech, D. Maschette, C. Masere, C. Péron, L. Readdy, N. Walker, and P. Ziegler Abstract: Changes in the underlying productivity for a stock can result in changes in the carrying capacity, and hence effect biomass-based reference points. The CCAMLR toothfish Decision Rules use reference points based on B₀ and assume that the underlying productivity of a stock does not change Read More Submitted By: Mr Nathan Walker (New Zealand) Approved By: Mr Nathan Walker (New Zealand) Request Meeting Document	5.1
WG-SAM-2024/26 More Info	Integrated approach to modeling krill population dynamics in Western Antarctic Peninsula. Spatial and ecosystem considerations Mardones, M., L. Krüger; F. Santa Cruz; C. Cárdenas and G. Watters Abstract: The integration of available sources of information is a challenge for any attempt to know dynamics populations for Antarctic Krill Euphausia superba in an integrated stock assessment model.Being able to identify sources of information, systematize and integrate it in a model and estimate krill population variables in a context of change and fisheries management is vital for Read More Submitted By: Mr Mauricio Mardones (Chile) Approved By: Mr Francisco Santa Cruz (Chile) Request Meeting Document	2
WG-SAM-2024/27 More Info	Derive growth parameters and natural mortality rates for krill considering spatial heterogeneity in Subarea 48.1 Mardones, M., C. Cárdenas, L. Krüger and F. Santa Cruz Abstract: The Western Antarctic Peninsula ecosystem plays a critical role in the cycle life of Antarctic krill (Euphausia superba). Recent environmental changes and increasing exploitation in this area have led to alterations in the structure of the krill population, calling for a review of the management approach. In this study, we derive growth Read More Submitted By: Mr Mauricio Mardones (Chile) Approved By: Mr Francisco Santa Cruz (Chile) Request Meeting Document	2

Agenda

Expand All Annotations | Expand All Documents | Collapse All

1 Introduction

Documents

1.1 Opening of the meeting

Annotations

The terms of reference for WG-SAM are to provide advice to the Scientific Committee and its working groups on:
(i) Quantitative assessment methods (including stock assessment methods and management strategy evaluation methods), statistical procedures, and modelling approaches for the conservation of Antarctic marine living resources
(ii) The implementation of, and data requirements for, such methods, procedures and approaches
(iii) Review of research plans and proposals
(iv) Sampling design of research fishing and surveys.

Documents

1.2 Adoption of the agenda

Annotations

The working group will consider amendments to and adoption of the meeting agenda.

Documents

2 Development of methods to estimate biomass for krill

Annotations

SC-CAMLR-42 recommended a rollover of CM 51-07 for one year and noted the importance of providing definitive advice using contemporary data and analysis such as spatial overlap analysis (SC-CAMLR-42, paragraph 2.27). Acoustic surveys will include sampling of krill length distributions designed to characterise the biomass of krill in each management unit. WG-SAM has identified the effective sampling size for length frequency distribution (Task 1) under the priority research topic 'Data collection – SISO and vessels and CEMP'.

Documents

WG-SAM-2024/26	Integrated approach to modeling krill population dynamics in Western Antarctic Peninsula. Spatial and ecosystem considerations Mardones, M., L. Krüger; F. Santa Cruz; C. Cárdenas and G. Watters
WG-SAM-2024/27	Derive growth parameters and natural mortality rates for krill considering spatial heterogeneity in Subarea 48.1 Mardones, M., C. Cárdenas, L. Krüger and F. Santa Cruz

3 Development of stock assessments to implement decision rules for krill

Annotations

The development of integrated stock assessments for krill (Task 2) has been identified as a potential approach to krill management. A Casal2 model for krill was encouraged to continue progressing through the consideration of six suggestions from WG-SAM-2023 (WG-SAM-2023, paragraph 4.3).

Documents

4 Develop methods to estimate biomass for finfish

Documents

4.1 Survey design

Annotations

Methods for calibration among vessels for tag release survival and tag detection have remained as a priority item for consideration by WG-SAM (SC-CAMLR-38, paragraph 13.4). Gear standardisation effects on toothfish tagging programs (Task 3) have been identified as a priority research topic for finfish biomass estimation in the workplan table (SC-CAMLR-42, Annex 7).

Documents

4.2 Data collection – SISO and vessels

Annotations

In the work plan table (SC-CAMLR-42, Annex 7), the following items have been indicated as planned work for 2024 regarding data collection from SISO and vessel operations:
a) Metrics of vessel tagging performance (Task 4)
b) Recording selection of non-random biological data (Task 5)
c) Development of protocols for toothfish conversion factors (Task 6)

Documents

WG-SAM-2024/10

Updates to Observer and Vessel forms and manuals for Longline Fisheries
CCAMLR Secretariat

4.3 Improve biomass estimation methods

Annotations

The Scientific Committee identified work towards estimating and correcting for the effects of changing spatial distributions on fishing effort in assessments (see details SC-CAMLR-42, para 2.124). These issues are priority work items in the WG-SAM work plan as: Optimise tag-based study (spatial overlap) (Task 7) and, Vessel configuration factors affecting tagging mortality (Task 8).

Documents

WG-SAM-2024/08

Evaluating a CPUE by seabed area analogy approach to estimate by-catch limits for macrourids in toothfish fisheries
CCAMLR Secretariat

5 Develop stock assessments to implement decision rules for finfish

Documents

5.1 Communication of progress, internal and external

Annotations

The Scientific Committee noted the commitment of Members undertaking integrated assessments for toothfish to collaboratively address the issues of effects of spatial bias in tagging data, and trends in recruitment in the short-term, and present results to WG-SAM-2024 with revised stock assessments to WG-FSA-2024 (SC-CAMLR-42, para 2.125).
The WG-SAM work plan table (SC-CAMLR-42, Annex 7) also indicates diagnostic graphs on stock status (Task 20) as a priority item for WG-SAM-2024.

Documents

WG-SAM-2024/22	Consideration of the impact of tagging and recapture effort on mark-recapture abundance estimators within integrated Casal2 stock assessments Masere, C., R. Le Clech, S. Alewijnse, J. Devine, A. Dunn, T. Earl, D. Maschette, F. Massiot-Granier, F. Ouzoulias, C. Péron, L. Readdy, N. Walker and P. Ziegler
WG-SAM-2024/23	Approaches to projecting recruitment in toothfish assessment models Earl, T., L. Readdy, S. Alewijnse, J. Devine, A. Dunn, R. Le Clech, D. Maschette, C. Masere, F. Massiot-Granier, F. Ouzoulias, C. Péron, N. Walker, and P. Ziegler
WG-SAM-2024/24	Consideration of the impact of tagging and recapture effort on mark-recapture abundance estimators within integrated Casal2 stock assessments – supplementary material Masere, C., R. Le Clech, S. Alewijnse, J. Devine, A. Dunn, T. Earl, D. Maschette, F. Massiot-Granier, F. Ouzoulias, C. Péron, L. Readdy, N. Walker, and P. Ziegler
WG-SAM-2024/25	Effects of implementing dynamic B0 in toothfish fisheries Ouzoulias, F., F. Massiot-Granier, S. Alewijnse, J. Devine, A. Dunn, T. Earl, R. Le Clech, D. Maschette, C. Masere, C. Péron, L. Readdy, N. Walker, and P. Ziegler

5.2 WS-ADM2-2024

Annotations

The Scientific Committee asked WG-SAM to complete an evaluation of reader comparison of toothfish otolith ageing works (Tasks 9-13) with reference to the outcomes of WS-ADM2-2024. The Age Determination Workshop in 2023 (WS-ADM) requested that WG-SAM and WG-FSA develop target levels of precision (CV, IAPE) for age determination among readers or counts between a single reader and a reference set to monitor and maintain consistency in age interpretation (WG-FSA-2023/43, para 2.16.2, Task 10 of WG-SAM work plan table).

Documents

WG-SAM-2024/14

Draft report of the co-conveners of the 2nd CCAMLR Ageing Determination Workshop (WS-ADM2)
Devine, J., P. Hollyman and C. Brooks

6 Management strategy evaluations for target species

Documents

WG-SAM-2024/15

An introduction to management strategies and harvest control rules
Dunn, A., P. Ziegler, S. Alewijnse, J. Devine, T. Earl, R. Le Clech, D. Maschette, C. Masere, F. Massiot-Granier, F. Ouzoulias, C. Péron, L. Readdy and N. Walker

6.1 Evaluation of the CCAMLR decision rules and potential alternative harvest control rules for assessed fisheries

Annotations

The Scientific Committee (SC-CAMLR-42, para 2.124) noted that WG-SAM needs to progress analyses of current and alternative decision rules, including building on the work of WG-FSA-2019/08, WG-SAM-2021/08, SC-CAMLR-38/15 and WG-FSA-2023/28 to investigate alternative rules and assumptions about future recruitment, and addressing recommendations 6.1 and 6.2 of the report of the independent review (SC-CAMLR-42/02 Rev. 2).

Documents

WG-SAM-2024/16	Development of U-based harvest control rules for assessed toothfish fisheries - 1. Background Ziegler, P., A. Dunn, S. Alewijnse, J. Devine, T. Earl, R. Le Clech, D. Maschette, C. Masere, F. Massiot-Granier, F. Ouzoulias, C. Péron, L. Readdy and N. Walker
WG-SAM-2024/17	Development of U-based harvest control rules for assessed toothfish fisheries - 2. Exploration of U-based HCRs Ziegler, P., A. Dunn, S. Alewijnse, J. Devine, T. Earl, R. Le Clech, D. Maschette, C. Masere, F. Massiot-Granier, F. Ouzoulias, C. Péron, L. Readdy and N. Walker

6.2 Development and testing of data-limited fishery decision rules

Annotations

The WG-SAM work plan table (SC-CAMLR-42, Annex 7) indicates that development and agreement on an operating model (Task 15) and a management strategy evaluation (MSE) (Task 16) are high priority topics for data-limited finfish fisheries.

Documents

WG-SAM-2024/01	Agent-Based Model - Parameter perturbation analysis Thanassekos, S.
WG-SAM-2024/09	ABM - Casal2 comparison of simple implementations Thanassekos, S. and A. Dunn
WG-SAM-2024/12	2024 provisional trend analysis: preliminary estimates of toothfish biomass in Research Blocks CCAMLR Secretariat

7 Review of new research proposals

Annotations

The Working Group will prioritise review of new research proposals (Task 14).

Documents

7.1 New proposals under CM 21-02

Documents

WG-SAM-2024/04

New research plan for Antarctic toothfish (Dissostichus mawsoni) exploratory fishery in Statistical Subarea 48.6 from 2024/25-2027/28): Research Plan under CM21-02, paragraph 6(iii)
Delegations of Japan, Republic of Korea, South Africa, and Spain

7.2 New proposals under CM 24-01

Annotations

The Scientific Committee recommended that research on Dissostichus spp. under CM 24-01 in Subarea 48.2 should be revised and presented at WG-SAM-2024 (SC-CAMLR-42, para 2.156).

Documents

WG-SAM-2024/03	New research plan for Antarctic toothfish (Dissostichus mawsoni) under CM 24-01, paragraph 3 in Subarea 88.3 by Korea and Ukraine from 2024/25 to 2026/27 Delegations of the Republic of Korea and Ukraine
WG-SAM-2024/06	New Fishery Research Proposal (Plan) Under CM 24-01, Paragraph 3, the Acoustic-Trawl Survey Champsocephalus gunnari in the Statistical Area 48.2 Delegation of Ukraine

8 Review of ongoing research plan results and proposals

Annotations

The Working Group should review ongoing research plan results and proposals (Task 14) according to the timetable specified in CCAMLR-38 paragraph 5.64

Documents

8.1 Research results and proposals from Area 48

Documents

WG-SAM-2024/07

2024 updated analysis of the sea ice concentration in research blocks 4(RB4), and 5(RB5) of Subarea 48.6 with sea surface temperature and winds and statistical analysis of repeated accessibility.
Namba, T., R. Sarralde, K Teschke, H. Pehlke, T. Okuda, S. Somhlaba and J. Pompert

8.2 Research results and proposals from Area 58

Documents

WG-SAM-2024/02

Continuing research in the Dissostichus mawsoni exploratory fishery in East Antarctica (Divisions 58.4.1 and 58.4.2) from 2022/23 to 2025/26; Research plan under CM 21-02, paragraph 6(iii)
Delegations of Australia, France, Japan, Republic of Korea and Spain

8.3 Research results and proposals from Area 88

Documents

WG-SAM-2024/05	Notification for the Ross Sea shelf survey in 2025: third year of an approved three year research plan. Research plan under CM 24-01, paragraph 3 - Continuing Research Delegation of New Zealand
WG-SAM-2024/13	Progress report on the joint research for Dissostichus spp. in area 88.3 by Republic of Korea and Ukraine in 2024 Delegations of the Republic of Korea and Ukraine
WG-SAM-2024/19	Evaluating the Feasibility of Pot Fishing for Toothfish in the Ross Sea Plum, B., H. Tijsen, A. Berry and N. Walker
WG-SAM-2024/21	A progress update on the 2024 Ross Sea shelf survey Devine, J., C.D. Jones and N.A. Walker

9 Ecosystem monitoring

Annotations

The Scientific Committee requested that Members identify priority species for fish by-catch data collection in the krill fishery (SC-CAMLR-42, para 2.64). The WG-SAM work plan table (SC-CAMLR-42, Annex 7) also lists effective sample size for fish by-catch monitoring in the krill fishery (Task 19) as a priority item for WG-SAM-2024.

The Scientific Committee recommended that future versions of warp strike and incidental mortality estimates in krill fisheries should include estimates of uncertainty in the extrapolations and encouraged members to submit papers to WG-SAM on undertaking approaches to inform the development of advice (SC-CAMLR-42, para 3.20). The Scientific Committee encouraged Members to submit analyses to WG-SAM on extrapolations from observations to inform mortality estimates (SC-CAMLR-42, para 3.38).

Documents

WG-SAM-2024/11

An updated method for the extrapolation of IMAF and warp strikes
CCAMLR Secretariat.

10 Future work

Annotations

The Working Group will review the work plan table (SC-CAMLR-42, Annex 7) based on the discussion during WG-SAM-2024.

Documents

11 Other business

Annotations

Participants are invited to identify issues for consideration under other business. Papers submitted under this agenda item need to link the content to a specific task of SAM, and identify the actions sought from the Working Group.
In 2019, the Scientific Committee agreed on six priority items for the consideration of WG-SAM-2020 (SC-CAMLR-38, paragraph 13.4). The development of toolbox for research plan design (SC-CAMLR-38, para 4.17) remains to be discussed in WG-SAM.

Documents

CCAMLR-42/18	On the status of the "best available scientific evidence" Delegation of the Russian Federation
WG-SAM-2024/20	CCAMLRTOOLS - an R package for working with CCAMLR data extracts CCAMLR Secretariat

12 Advice to the Scientific Committee

Annotations

WG-SAM provides advice to each of the working groups and to the Scientific Committee on statistics, assessments and modelling. Specific advice will be summarised in this agenda item following general discussion within other agenda items.

Documents

13 Adoption of report and close of meeting

Documents