Search

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: MARAM/IWS/2019/PENG/P4. 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”