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Comentarios(/Resúmenes)
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.
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The working group will consider amendments to and adoption of the meeting agenda.
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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'.
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| 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 |
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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).
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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).
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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)
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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).
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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.
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| 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 |
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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).
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| 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 |
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| 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 |
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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).
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| 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 |
Comentarios(/Resúmenes)
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.
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| 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 |
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The Working Group will prioritise review of new research proposals (Task 14).
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| 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 |
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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).
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The Working Group should review ongoing research plan results and proposals (Task 14) according to the timetable specified in CCAMLR-38 paragraph 5.64
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| 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 |
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| 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 |
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| 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 |
Comentarios(/Resúmenes)
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).
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| WG-SAM-2024/11 | An updated method for the extrapolation of IMAF and warp strikes CCAMLR Secretariat. |
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The Working Group will review the work plan table (SC-CAMLR-42, Annex 7) based on the discussion during WG-SAM-2024.
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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.
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| CCAMLR-42/18 | Sobre el estado de los “mejores conocimientos científicos disponibles” Delegación de la Federación de Rusia |
| WG-SAM-2024/20 | CCAMLRTOOLS - an R package for working with CCAMLR data extracts CCAMLR Secretariat |
Comentarios(/Resúmenes)
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.