General
General 1: Announcement. MARAM/IWS/2022/General/1. 1pp. (uploaded 22/11/2022)
General 2: Schedule. MARAM/IWS/2022/General/2. 1pp. (uploaded 22/11/2022)
General 3: Document list (final). MARAM/IWS/2022/General/3. 7pp. (updated 16/12/2022)
General 4: Questions to the Panel. MARAM/IWS/2022/General/4. 2pp. (uploaded 22/11/2022)
General 5: Presentation of the Panel Report. MARAM/IWS/2022/General/5. 26 slides (uploaded 05/12/2022).
General 6: IWS 2022 Final Panel Report. MARAM/IWS/2022/General/6. 12pp. (uploaded 05/12/2022)
Hake: longline vs trawling
Primary papers
P1: Bergh, M. (OLSPS Marine). Summary of the spatial competition issue for trawling vs longlining and questions for the IWS panel. MARAM/IWS/2022/Hake/P1. 2pp. (uploaded 18/11/2022)
P2: Bergh, M. (OLSPS Marine). Evidence of spatial competition between hake deep-sea trawls and longline sets, an overview. MARAM/IWS/2022/Hake/P2. 8pp. (uploaded 18/11/2022)
P3: Bergh, M. (OLSPS Marine). Trends in the spatial distribution of hake long line fishing effort. MARAM/IWS/2022/Hake/P3. (DFFE Fisheries document: FISHERIES/2022/AUG/SWG-DEM/10REV). 19pp. (uploaded 18/11/2022)
P4: Bergh, M. (OLSPS Marine). The relationship between the number of trawls and long line sets at different spatio-temporal resolutions. MARAM/IWS/2022/Hake/P4. (DFFE Fisheries document: FISHERIES/2022/OCT/SWG-DEM/42). 16pp. (uploaded 18/11/2022).
P11: South African Hake Longline Association. Spatial expansion of the hake longline fishery for hake and the possible implications on the understanding of the stock dynamics. MARAM/IWS/2022/Hake/P11. 6pp. (updated 09/12/2022)
Background documents
BG1: Bergh, M. (OLSPS Marine). Economic and other impacts of proposed changes to hake sectoral allocations. MARAM/IWS/2022/Hake/BG1. (DFFE Fisheries document: FISHERIES/2022/APR/SWG-DEM/07). 64pp. (uploaded 18/11/2022)
Slides and presentations
1: Bergh, M. (OLSPS Marine). Introduction to hake trawl vs longlining issue and documents. 10 slides. (uploaded 25/11/2022)
2: Bergh, M. (OLSPS Marine). Document P3: Trends in the spatial distribution of hake long line fishing effort. 10 slides. (uploaded 29/11/2022)
3: Bergh, M. (OLSPS Marine). Document P4: The relationship between the number of trawls and long line sets at different spatio-temporal resolutions. 13 slides. (uploaded 29/11/2022)
Hake: shared stock
Primary papers
P5: Butterworth, D.S. and Ross-Gillespie, A. A summary of key issues relating to MSC queries about the assessment of deep-water hake (M. paradoxus) as a stock shared between South Africa and Namibia. MARAM/IWS/2022/Hake/P5. 8pp. (uploaded 22/11/2022)
P6: Butterworth, D.S. and Ross-Gillespie, A. On the robustness of the SA hake OMP2018 to an increased Namibian catch of M. paradoxus. MARAM/IWS/2022/Hake/P6 (DEFF Fisheries document: FISHERIES/2020/MAR/SWG-DEM/02). 11pp. (uploaded 18/11/2022)
P7: Butterworth, D.S. and Ross-Gillespie, A. Simple variants of the SA hake Reference Case Operating Model (assessment) to take account of Namibian catches of M. paradoxus. MARAM/IWS/2022/Hake/P7. (DEFF Fisheries document: FISHERIES/2020/MAR/SWG-DEM/03). 11pp. (uploaded 22/11/2022)
P8: Butterworth, D.S. and Ross-Gillespie, A. A further variant of the South African hake 2019 Reference Case assessment model that includes the Namibian M. paradoxus survey abundance series as well as historical Namibian catches. MARAM/IWS/2022/Hake/P8. (DEFF Fisheries document: FISHERIES/2020/AUG/SWG-DEM/11). 4pp. (uploaded 18/11/2022)
P9: Punt, A.E. Review of two analyses related to the robustness of the management procedure for South African hake to assumptions related to a stock distribution for M. paradoxus that extends into Namibia. MARAM/IWS/2022/Hake/P9. (DEFF Fisheries document: FISHERIES/2020/MAR/SWG-DEM/04). 3pp. (uploaded 18/11/2022)
P10: Wilberg, M.J. Review of the potential implications of a shared M. paradoxus stock between South Africa and Namibia on the performance of OMP2018. MARAM/IWS/2022/Hake/P10. (DEFF Fisheries document: FISHERIES/2020/MAR/SWG-DEM/05.). 2pp. (uploaded 18/11/2022)
Background documents
BG3: Ross-Gillespie, A. Update to the hake Reference Case Operating Model with corrected longline data, and 2021 commercial and 2022 survey data. MARAM/IWS/2022/Hake/BG3. (DFFE Fisheries document: FISHERIES/2022/OCT/SWG-DEM/35rev). 15pp. (uploaded 22/11/2022)
BG4: Ross-Gillespie, A. and Butterworth D.S. Road map for the 2022 hake OMP revision. MARAM/IWS/2022/Hake/BG4. (DFFE Fisheries document: FISHERIES/2022/OCT/SWG-DEM/30rev). 11pp. (uploaded 22/11/2022)
BG5: Hake assessment document from Namibia. MARAM/IWS/2022/Hake/BG5. 28pp. (updated 09/12/2022)
Slides and presentations
1: Butterworth D.S. and Ross-Gillespie, A. Hake: shared stock. 11 slides. (uploaded 25/11/2022)
2: Durholtz, D. An overview of the SA hake fishery. 11 slides. (uploaded 25/11/2022)
Working papers
WP1: Species proportion in hake catches. MARAM/IWS/2022/Hake/WP1. 1pp. (uploaded 29/11/2022)
WP2: Relative abundance series plots. MARAM/IWS/2022/Hake/WP2. 2pp. (uploaded 30/11/2022)
WP3: Ross-Gillespie, A. Summary of Namibian data provided on 29 November 2022. MARAM/IWS/2022/Hake/WP3. 1pp. (uploaded 30/11/2022)
Sardine
Primary papers
P1: de Moor, C. List of key questions for the panel regarding sardine, together with brief summaries of the documents provided. MARAM/IWS/2022/Sardine/P1. 2pp. (updated 09/12/2022)
P2: Teske, P.R., Emami-Khoyi, A., Golla, T.R., Sandoval-Castillo, J., Lamont, T., Chiazzari, B., McQuaid, C.D., Beheregaray, L.B., van der Lingen, C.D. The sardine run in southeastern Africa is a mass migration into an ecological trap. MARAM/IWS/2022/Sardine/P2. 9pp. (uploaded 18/11/2022)
P3: de Moor, C., van der Lingen, C. and Teske, P. A new hypothesis for South African sardine stock structure. MARAM/IWS/2022/Sardine/P3. (DFFE Fisheries document: FISHERIES/2022/MAY/SWG-PEL/11REV). 8pp. (updated 17/02/2023)
P4: de Moor, C.L. Description of sardine model and some initial results assuming a revised stock structure hypothesis. MARAM/IWS/2022/Sardine/P4. 28pp. (updated 17/02/2023)
Background documents
BG1: Coetzee, J.C., de Moor, C.L., van der Lingen, C.D. and Butterworth D.S. A summary of the South African sardine (and anchovy) fishery. MARAM/IWS/2022/Sardine/BG1. 19pp. (uploaded 22/11/2022)
BG2: Butterworth, D.S., van der Lingen, C.D., Coetzee, J. and de Moor, C.L. The present agreed hypothesis for South African sardine stock structure. MARAM/IWS/2022/Sardine/BG2. (DFFE Fisheries Branch document: FISHERIES/2016/NOV/SWG-PEL/69). 3pp. (uploaded 18/11/2022)
BG3: de Moor, C.L., Butterworth, D.S. and van der Lingen, C.D. The quantitative use of parasite data in multistock modelling of South African sardine (Sardinops sagax). MARAM/IWS/2022/Sardine/BG3. 9pp. (updated 22/11/2022)
BG4: de Moor, C.L. Updated assessment of the South African sardine resource using data from 1984-2020. MARAM/IWS/2022/Sardine/BG4. 35pp. (uploaded 22/11/2022)
BG5: van der Lingen, C.D. A synthesis of studies of South African sardine population structure. MARAM/IWS/2022/Sardine/BG5. (DEFF Fisheries document: FISHERIES/2022/JUN/SWG-PEL/16). 5pp. (uploaded 25/11/2022)
Slides and presentations
1: de Moor, C.D., van der Lingen, C.D. and Teske, P. A new hypothesis for South African sardine stock structure. 7 pp. (uploaded 26/11/2022)
2: Teske, P. Population genomic structure in Sardinops sagax. 11 pp. (updated 28/11/2022)
3: de Moor, C. and Coetzee, J. An Introduction to the South African Sardine Resource and Fishery. 19 pp. (uploaded 27/11/2022)
4: de Moor, C. An Initial Simple Model of the Revised Stock Structure Hypothesis for South African Sardine. 21 pp. (uploaded 29/11/2022)
Working Papers
WP1: van der Lingen, C.D. The South African sardine boom in the early 2000s coincided with anomalously warm SSTs off the west coast. MARAM/IWS/2022/Sardine/WP1. 3pp. (uploaded 26/11/2022)
WP2: de Moor, C.L. Further results from an initial simple model of the revised stock structure hypothesis for South African sardine. MARAM/IWS/2022/Sardine/WP2. 13pp. (uploaded 28/11/2022)
WP3: de Moor, C.L. Diagrams to compare models of the previous and revised sardine stock structure hypotheses for South African sardine. MARAM/IWS/2022/Sardine/WP3. 2pp. (uploaded 28/11/2022)
WP4: Coetzee, J. 2022. Sardine length frequencies from November Hydro-acoustic surveys. MARAM/IWS/2022/Sardine/WP4. 2pp. (uploaded 29/11/2022)
WP5: Coetzee, J., Merkle, D., Hutchings, L., van der Lingen, C.D., van den Berg, M. and Durholtz, M.D. The 2005 KwaZulu-Natal sardine run survey sheds new light on the ecology of small pelagic fish off the east coast of South Africa. MARAM/IWS/2022/Sardine/WP5. 24pp. (uploaded 29/11/2022)
WP6: van der Lingen, C.D. 2022. Sardine genomics and parasite update. MARAM/IWS/2022/Sardine/WP6. 12pp. (updated 29/11/2022)
WP7: van der Lingen, C.D., Hendricks, M., Durholtz, D., Wessels, G. and Mtengwane, C. 2022. Biological characteristics of sardine caught by the beach-seine fishery during the KwaZulu-Natal sardine run. MARAM/IWS/2022/Sardine/WP7. 22pp. (uploaded 29/11/2022)
West Coast rock lobster
Primary papers
P1: Johnston, S.J. and Butterworth, D.S. A summary of key issues relating to the estimation of poaching trends for west coast rock lobster Jasus lalandii. MARAM/IWS/2022/WCRL/P1. 14pp. (uploaded 22/11/2022)
P2: Johnston, S.J. and Butterworth, D.S. A summary of key issues relating to the fitting of FIMS data for west coast rock lobster Jasus lalandii. MARAM/IWS/2022/WCRL/P2. 19pp. (uploaded 22/11/2022)
P3: Johnston, S.J. List of key questions for the panel regarding west coast rock lobster, together with brief summaries of the documents provided. MARAM/IWS/2022/WCRL/P3. 3pp. (uploaded 18/11/2022)
Background documents
BG1: Brandao, A. and Butterworth, D.S. Updating compliance poaching trends for west coast rock lobster from modelling the “old” and “new” databases simultaneously. MARAM/IWS/2022/WCRL/BG1. (DFFE Fisheries Branch document: FISHERIES/2022/JUN/SWG/WCRL/09). 14pp. (uploaded 18/11/2022)
BG2: Louw, S., Okes, N. and Burgener, M. Estimating poached west coast rock lobster exports from South Africa to international destinations (2000-2021). MARAM/IWS/2022/WCRL/BG2. (DFFE Fisheries Branch document: FISHERIES/2022/JUL/SWG/WCRL/22). 10pp. (uploaded 18/11/2022)
BG3: Johnston, S.J. and Butterworth, D.S. Overall poaching time series for west coast rock lobster, resulting from combining estimates of illegally exported and locally sold lobsters and compliance time series as at June 2. MARAM/IWS/2022/WCRL/BG3. (DFFE Fisheries Branch document: FISHERIES/2022/JUN/SWG/WCRL/13). 15pp. (uploaded 18/11/2022)
BG4: Johnston, S.J. and Butterworth, D.S. Further 2022 poaching trends for west coast rock lobster. MARAM/IWS/2022/WCRL/BG4. (DFFE Fisheries Branch document: FISHERIES/2022/JUL/SWG/WCRL/18). 11pp. (uploaded 18/11/2022)
BG5: Johnston, S.J. and Butterworth, D.S. Updated 2022 assessments of the west coast rock lobster resource. MARAM/IWS/2022/WCRL/BG5. (DFFE Fisheries Branch document: FISHERIES/2022/AUG/SWG/WCRL/23). 28pp. (uploaded 18/11/2022)
BG6: Johnston, S.J. and Butterworth, D.S. Initial 2022 projections of the west coast rock lobster resource. MARAM/IWS/2022/WCRL/BG6. (DFFE Fisheries Branch document: FISHERIES/2022/AUG/SWG/WCRL/25). 7pp. (uploaded 22/11/2022)
BG7: Johnston, S.J. and Butterworth, D.S. Further assessment results for the 2022 updated assessment of west coast rock lobster. MARAM/IWS/2022/WCRL/BG7. (DFFE Fisheries Branch document: FISHERIES/2022/AUG/SWG/WCRL/24). 8pp. (uploaded 18/11/2022)
BG8: Johnston, S.J. and Brandao, A. Excerpts from the 2017, 2018 and 2019 IWS panel recommendations relating to compliance poaching data for west coast rock lobster. MARAM/IWS/2022/WCRL/BG8. 5pp. (uploaded 22/11/2022)
BG9: Johnston, S.J. and Butterworth, D.S. The size-structured (length-based) stock assessment methodology applied to west coast rock lobster. MARAM/IWS/2022/WCRL/BG9. 15pp. (uploaded 22/11/2022)
Slides and presentations
1: Johnston, S.J. The west coast rock lobster fishery: A brief historical summary and introduction to matters to be discussed. 24 slides. (uploaded 25/11/2022)
Working papers
WP1: Johnston, S.J. West coast rock lobster: sensitivities to poaching “marriage” model for the South. MARAM/IWS/2022/WCRL/WP1. 3pp. (uploaded 29/11/2022)
WP2: Johnston, S.J. West coast rock lobster: A8+ FIMS selectivity functions. MARAM/IWS/2022/WCRL/WP2. 1pp. (uploaded 29/11/2022)
Squid
Primary papers
P1: Durholtz, M.D. and Glazer, J.P. 2022. Squid: summary of resource and fishery, and on improving the assessment model. MARAM/IWS/2022/Squid/P1. 6pp. (updated 13/12/2022)
P2: Glazer, J.P. Updated assessment of the squid resource, Loligo reynaudii. MARAM/IWS/2022/Squid/P2. (DFFE Fisheries document: FISHERIES/2019/MAR/SWG-SQ/06). 19pp. (updated 22/11/2022)
P3: Anon. Squid assessment discussion points: Task Group meeting, 19 March 2021. MARAM/IWS/2022/Squid/P3. 2pp. (updated 13/12/2022)
Background documents
BG1: Hampton, I., Soule, M.A. and Mwicigi, J. Summary of acoustic work to assess the biomass of the aggregated chokka squid on its inshore spawning grounds on the south-east coast of South Africa in the season closed for fishing. MARAM/IWS/2022/Squid/BG1. 5pp. (uploaded 21/11/2022)
Slides and presentations
1: Glazer, J.P. and Durholtz, D. Background information to the South African Squid Resource Loligo reynaudi. 9 slides. (uploaded 25/11/2022)
Working papers
WP1: Soule, M.A. and Hampton, I. Acoustic survey of chokka squid on inshore spawning grounds between Seal point and Maitlands in the November 2020 closed season from Research Inflatable Abyss. MARAM/IWS/2022/Squid/WP1. 11pp. (uploaded 30/11/2022)
WP2: Soule, M.A. and Hampton, I. Acoustic survey of squid in inshore spawning grounds between Storms River Mouth and Port Alfred from R.V. Ellen Khuzwayo and Research Inflatable Abyss between 31 October and 20 November 2021 MARAM/IWS/2022/Squid/WP2. 39pp. (uploaded 30/11/2022)
Sole
Primary papers
P1: Butterworth, D.S., Glazer, J.P. and Durholtz, D.D. 2022. The sole assessment enigma. MARAM/IWS/2022/Sole/P1. 1pp. (updated 16/12/2022)
P2: Glazer, J., Butterworth, D.S. and Fairweather, T. 2022 sole dynamic Schaefer production model results. MARAM/IWS/2022/Sole/P2. 12pp (uploaded 22/11/2022).
Slides and presentations
1: Glazer, J.P. and Durholtz, D. The South African Sole Resource Austroglossus pectoralis. 7 slides. (uploaded 25/11/2022)
Working papers
WP1: Sole survey abundance. MARAM/IWS/2022/Sole/WP1. 1pp. (uploaded 28/11/2022)
WP2: Fairweather, T.P. Agulhas sole: Abundance estimates within the sole grounds, survey length frequency by strata, commercial CPUE and CAL, and updated graph for model fit. MARAM/IWS/2022/Sole/WP2. 13pp. (uploaded 01/12/2022)
Reference points
Primary papers
P1: Comments on where next on fishery “Reference Points”/Management. MARAM/IWS/2022/RefPts/P1. 7pp. (uploaded 21/11/2022)
P2: Further comments related to fishery “Reference Points”/Management. MARAM/IWS/2022/RefPts/P2. 7pp. (uploaded 21/11/2022)
Background documents
BG1: Evaluating the effectiveness of Fish Stocks rebuilding plans in the United States. MARAM/IWS/2022/RefPts/BG1. 292pp. (updated 09/12/2022)
Slides and presentations
1: Sissenwine, M. Have fishery scientists and managers gotten too far out over their skis? 9 slides. (updated 09/12/2022)
2: Taylor, N. Probability and Reference Points in Practice: aspirations, uses, abuses, and general confusion. 10 slides. (uploaded 09/12/2022)
3: Parma, A. Non-stationarity issues in assessment and management: Some dos and don’ts. 6 slides. (uploaded 09/12/2022)
Working Papers
WP1: Butterworth, D.S. A comment on addressing climate change using MSE. MARAM/IWS/2022/RefPts/WP1. 1pp. (uploaded 27/11/2022)
WP2: Punt, A.E. Including ecosystem information in assessments and management advice. MARAM/IWS/2022/REFPTS/WP2. 45pp. (uploaded 29/11/2022)
WP3: Gaichas, S. Adapting Fisheries Management to a Changing Ecosystem. MARAM/IWS/2022/REFPTS/WP3. 1pp. (uploaded 29/11/2022)
WP4: Ianelli, J. Perspectives on ways complex ecosystem projections can be applied in real-world fisheries management cases. MARAM/IWS/2022/REFPTS/WP4. 50pp. (uploaded 29/11/2022)