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International Fisheries Stock Assessment Review Workshop

2019 Workshop

General:

General 1: Announcement 
General 2: Schedule.
General 3: Document list.
General 4: Presentation of Panel Report.
General 5: IWS 2019 Final Panel Report.

Past workshop panel reports

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007


Hake

Primary papers

P1:  Dunn, A., Link, J. S., Punt, A. E., Stefansson, G. and Waples, R. S. 2014. Excerpts from the 2014 International Review Panel Report for the 2014 International Stock Assessment Workshop.
P2: MARAM/IWS/2019/Hake/P2. Copyright precludes posting. The link is not available.

P3: MARAM/IWS/2019/Hake/P3. This preliminary document awaits finalisation before it can be made public.

P4: Butterworth, D.S. and Rademeyer,R A. 2014. First cut at broad model specifications for the development of transboundary hake stock assessments. International Stock Assessment Workshop document MARAM/IWS/DEC14/Hake/P10. 4pp.
P5: Questions to IWS 2019 Panel with respect to hake, together with brief summaries of the documents provided
P6: Japp, D., Durholtz, D. and Fairweather, T.P. 2019. Spatial aspects of hakes (Merluccius capensis and M. paradoxus) in the BCLME – a review of available information.
P7: Bergh, M. 2019. Use of a no-adult migration model with one-way egg and larval migration in MSE’s.

Background documents

BG1: Ross-Gillespie, A. and Butterworth, D.S. 2019. Response to the review panel report for the 2018 International Stock Assessment Workshop: Hake.
BG2: Durholtz, M.D. 2018. An overview of the SA hake fishery. 8pp.
BG3: Waples, R. S. 1998. Separating the Wheat from the Chaff: Patterns of Genetic Differentiation in High Gene Flow Species. 13pp.
BG4: Waples, R.S., Punt, A. and Cope, J. 2008. Integrating genetic data into management of marine resources: how can we do it better? Fish and Fisheries, 2008, 9, 423-449. 27pp. DAFF Fisheries Branch document FISHERIES/2018/OCT/SWG-DEM/73.
BG5: Waples, R. 2015. Testing for Hardy-Weinberg Proportions: Have We Lost the Plot? Journal of Heredity, 2015:106(1):1-19. 19pp.
BG6: Waples, R., Hoelzel, A., Gaggiotti, O., Tiedemann, R., Palsboll, P. J., Cipriano, F., Jackson, J., Bickham, J. and Lang, A. 2018. Guidelines for genetic data analysis. J. Cetacean Res. Manage. 18: 33-80, 2018. 48pp.

BG7: Some inferences from an overview of genetic and other information regarding some key aspects of M. paradoxus stock structure off South Africa and Namibia. Fisheries document FISHERIES/2019/AUG/SWG-DEM/11. 7pp.

BG8: Jansen, T., Kainge, P., Singh, L., Wilhelm, M., Durholtz, D., Stromme, T., Kethena, J, and Erasmus, V. 2015. Spawning patterns of shallow-water hake (Merluccius capensis) and deep-water hake (M. paradoxus) in the Benguela Current Large Marine Ecosystem inferred from gonadosomatic indices. Fisheries Research 172 (2015) 168-180. 13pp.
BG9: Kainge, P., Kjesbu, O. S., Thorsen, A. and Salvanes, A. G. 2007. Merluccius capensis spawn in Namibian waters, but do M. paradoxus? African Journal of Marine Science 2007, 29(3): 379-392.
BG10: Ross-Gillespie, A. and Butterworth, D.S. 2019. Updated specifications, conditioning results and projections for the Hake OMP2018 Reference Set models. Fisheries document FISHERIES/2019/MAR/SWG-DEM/03.
BG11: Ross-Gillespie, A. and Butterworth, D.S. 2019. Update to the hake Reference Case model incorporating the 2018 commercial and 2019 survey data. Fisheries document FISHERIES/2019/OCT/SWG-DEM/22rev.
BG12: MARAM/IWS/2019/Hake/BG12. Copyright precludes posting. The link is not available.
BG13: Kathena, J. N., Nielsen, A., Thygesen, U. H. and Berg, C. W. 2016. Hake species (Merluccius capensis and M. paradoxus) assessment in the Benguela Current Large Marine Ecosystem. Environmental Development 17 (2016) 193-201.
BG14: Jansen, T., Kristensen, K., Kainge, P., Durholtz, D., Stromme, T., Thygesen, U. H., Wilhelm, M., Kathena, J., Fairweather, T., Paulus, S., Degel, H., Lipinski, M. and Beyer, J. 2016. Migration, distribution and population (stock) structure of shallow-water hake (Merluccius capensis) in the Benguela Current Large Marine Ecosystem inferred using a geostatistical population model. Fisheries Research, 179 (2016) 156-167.
BG15: Jansen, T., Kristensen, K., Fairweather, T. P., Kainge, P., Kathena, J. N., Durholtz, M. D., Beyer, J. E. and Thygesen, U. H. 2017. Geostatistical modelling of the spatial life history of post-larval deepwater hake Merluccius paradoxus in the Benguela Current Large Marine Ecosystem. African Journal of Marine Science, 39:3, 349-361. 14pp.
BG16: Lah, L. Trense, D., Benke, H., Berggren, P., Gunnlaugsson, P., Lockyer, C., Ӧztürk, A., Pawliczka, I., Roos, A., Siebert, U., Skόra, K., Víkingsson, G. and Tiedemann, R. Spatially Explicit Analysis of Genome-Wide SNPs Detects Subtle Population Structure in a Mobile Marine Mammal, the Harbor Porpoise.

Slides and presentations

Hake opening presentation.
Waples, R. Analysis of population genetic data: Identifying populations or stocks.
Tiedemann, R. Molecular DNA markers suitable for population/stock delimitation and assignment.


Kingklip

Primary papers

P1:  Henriques, R., Nielsen, E., Durholtz, D., Japp, D. and von der Heyden, S. 2017. Genetic population sub-structuring of kingklip (Genypterus capensis – Ophidiidiae), a commercially exploited demersal fish off South Africa.
P2: Questions to IWS 2019 Panel with respect to kingklip, together with brief summaries of the documents provided.

Background documents

BG1: Singh, L., Japp, D. and Durholtz, D. Kingklip Stock Structure: Information Document prepared for the annual IWS in December 2019.


Sardine

Primary papers

P1:  List of key questions for the panel regarding sardine, together with brief summaries of the documents provided.
P2: de Moor, C.L. and Coetzee, J.C. A summary of the method used to provide 2019 catch limit advice for South African sardine.
P3: de Moor CL, Butterworth DS and Coetzee JC. 2019. Uncertainties and associated concerns relating to using short‐term projections to advise on the 2020 sardine TAC and TABs.

Background documents

BG1: Coetzee, J.C., de Moor, C.L. and Butterworth, D.S. A summary of the South African sardine (and anchovy) fishery.
BG2: de Moor, C.L. and Butterworth, D.S. Progress on recommendations from the 2018 review panel report.

Slides and presentations

South African Sardine:Setting TAC/Bsduring Exceptional Circumstances (and beyond).
A summary of the South African sardine resource and fishery.

Working papers

WP1:Additional information regarding trawl samples taken during the November 2018 pelagic biomass survey.


West Coast Rock Lobster

Primary papers

P1:  Brandão, A. and Butterworth, D.S. Trends in poaching for West Coast rock lobster from modelling the “old” and the “new” databases simultaneously updated to 2018.
P2: Johnston, S.J. and Butterworth, D.S. Updates to West Coast Rock Lobster assessments and projections following recommendations made by IWS 2018 panel.

P3: Johnston, S.J. and Butterworth, D.S. Recent work pursued for West Coast rock lobster.

P4: Johnston, S.J. and Butterworth, D.S. Including stock-recruitment relationships in West Coast rock lobster projections.
P5: Johnston, S.J. and Butterworth, D.S. Questions to IWS 2019 Panel with respect to West Coast rock lobster, together with brief summaries of the documents provided.

Background documents

BG1: Johnston, S.J. and Butterworth, D.S. A summary of the west coast rock lobster fishery.
BG2: Johnston, S.J. and Butterworth, D.S. Final poaching trends for the west coast rock lobster fishery.
BG3: Johnston, S.J. and Butterworth, D.S. Follow up on IWS 2018 workshop recommendations made with respect to West Coast rock lobster.

Slides and presentations

WCRL introductory presentation.

Working papers

WP1: Johnston, S.J. Responses to various panel requests.
WP2: Johnston, S.J. and Butterworth, D.S. The size-structured (length-based) stock assessment methodology applied to west coast rock lobster.
WP3: Brandão, A. and Butterworth, D.S. Trends in poaching for West Coast rock lobster from modelling the “old” and the “new” databases simultaneously.
WP4: Waples, R. Comments on the rock lobster growth rate decline.


Penguins

Primary papers

P1: Questions to IWS 2019 Panel with respect to penguins, together with brief summaries of the documents provided.
P2: Ross-Gillespie A. and Butterworth D.S. Updated GLMM results for the South Coast penguin colony foraging data (Fisheries document FISHERIES/2019/NOV/SWG-PEL/27rev)
P3: Ross-Gillespie A. and Butterworth D.S. 2019. Results for GLMM analyses of the South Coast penguin colony chick condition data (Fisheries document FISHERIES/2019/NOV/SWG-PEL/33)

P4: Sherley RB, Barham BJ, Barham PJ, Campbell KJ, Crawford RJM, de Blocq A, Grigg J, Le Guen C, Hagen C, Makhado AB, McInnes A, Meyer A, Morris T, Pichegru L, Steinfurth A, Upfold L, van Onselen M, Visagie J, Weller F and Winker H. A Bayesian approach to understand the overall effect of the purse-seine fishing closures around African penguin colonies. MARAM/IWS/2019/PENG/P4. Also referenced as FISHERIES/2019/NOV/SWG-PEL/32rev.

Confidentiality precludes posting - the link is not available.

P5: Ross-Gillespie A. and Butterworth D.S. 2019. Is pseudo-replication biasing results from analyses from the island closure experiment which model individual penguin responses directly? (Fisheries document FISHERIES/2019/NOV/SWG-PEL/34rev)
P6: Winker H. and Sherley R.B. 2019. Brief reply to Butterworth and Ross-Gillespie: “Is pseudo-replication biasing results from analyses from the island closure experiment which model individual penguin responses directly?” (Fisheries document FISHERIES/2019/NOV/SWG-PEL/37rev.)
P7: Butterworth DS and Ross-Gillespie A. 2019. Response to MARAM/IWS/2019/PENG/P6.
P8: Winker H. and Sherley R.B. 2019. Response to MARAM/IWS/2019/PENG/P7

Background documents

BG1: Coetzee J.C. 2019. The experimental closure to purse-seine fishing around some African Penguin breeding colonies.
BG2: Penguin Island Closure Task Team. Consolidated analyses produced in implementation of the approaches described in document MARAM/IWS/DEC15/PengD/P1.

Slides and presentations

Penguin introductory presentation.
Use of individual vs. annual aggregate data in modelling marine resource dynamics.

Working papers

WP1: Update of Table 1 from PENG/P7 including the effective specifications for run 5 and 10 of PENG/P5.
WP2: Ross-Gillespie, A. and Butterworth, D.S. Relationship of equation (1) of PENG/P4 to equation (4) of PENG/P7
WP3: Sherley, R.B, and Winker, H. Some observations on comparisons of fitting to the annual means and the observation-level data for the cases in MARAM/IWS/DEC19/Peng/P4 that support a positive effect of the island closures experiment on African penguins.
WP4: Ross-Gillespie, A. and Butterworth, D.S. Introducing an imbalance in the sampling from the unknown covariate from OM3.
WP5:Winker, H. Initial comments on the remaining limitations of MARAM/IWS/2019/Peng/WP4: “Introducing an imbalance in the sampling from the unknown covariate from OM3”