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International Fisheries Stock Assessment Review Workshop

2015 Workshop

General

MARAM/IWS/DEC15/General/1. Announcement
MARAM/IWS/DEC15/General/2. Schedule
MARAM/IWS/DEC15/General/3. Document list
MARAM/IWS/DEC15/General/4. Defining the scope of EAF - Discussion session during International Stock Assessment workshop
MARAM/IWS/DEC15/General/5. Key questions for the Panel to address
MARAM/IWS/DEC15/General/6. Wednesday Schedule Update
MARAM/IWS/DEC15/General/7. Presentation of the Panel Report.
MARAM/IWS/DEC15/General/8. Panel Report.

Hake

Primary papers

MARAM/IWS/DEC15/Hake/P1. Modelling cannibalism and inter-species predation for Cape hake Merluccius capensis and M. paradoxus: Model specifications and preliminary results.

Background documents

MARAM/IWS/DEC15/Hake/BG1. Investigating different methods for obtaining hake survey probability distributions for length, and an inspection the sub-sample for which biologicals were measured.
MARAM/IWS/DEC15/Hake/BG2. Modelling cannibalism and inter-species predation for Cape hake Merluccius capensis and M. paradoxus: an update to MARAM/IWS/DEC13/Ecofish/P10.
MARAM/IWS/DEC15/Hake/BG3. Report on progress made on the hake cannibalism and inter-species predation model.
MARAM/IWS/DEC15/Hake/BG4. An initial attempt at a spatially structured stock assessment for the South African hake resource including movement based on a gravity model.

Slides and Presentation

Updating the Rademeyer and Butterworth (2014) hake model to take into account the effects of hake cannibalism and inter-species predation for two Cape hake species Merluccius capensis and M. paradoxus. Andrea Ross-Gillespie.

Working Papers

MARAM/IWS/DEC15/Hake/WP1. An alternative approach that may help resolve the data conflicts observed in the model presented in MARAM/IWS/DEC15/Hake/P1.

Sardine

Primary papers

MARAM/IWS/DEC15/Sardine/P1. The stock assessment model for South African sardine.
MARAM/IWS/DEC15/Sardine/P2. Preliminary analyses of infection of western and southern sardine by a ``tetracotyle'' type digenean parasite from samples collected during the November pelagic biomass surveys and May pelagic recruit surveys, 2010-2014.
MARAM/IWS/DEC15/Sardine/P3. Initial results from fitting the revised sardine two-mixing stock model to data from 1984-2014, including parasite prevalence-by-length sampled from November surveys 2010-2014.

Background documents

MARAM/IWS/DEC15/Sardine/BG1. Overview of Sardine Documents.
MARAM/IWS/DEC15/Sardine/BG2. Progress report on recommendations from the international review panel report for the 2013 and 2014 International Fisheries Stock Assessment Workshop: sardine two-stock hypothesis.
MARAM/IWS/DEC15/Sardine/BG3. A record of the generation of data used in the 2015 sardine and anchovy assessments.
MARAM/IWS/DEC15/Sardine/BG4. Assessing the South African sardine resource: two stocks rather than one?
MARAM/IWS/DEC15/Sardine/BG5. Alternative hypotheses of two mixing stocks of South African sardine: Initial testing.
MARAM/IWS/DEC15/Sardine/BG6. Stock discrimination of South African sardine (Sardinops sagax) using a digenean parasite biological tag.
MARAM/IWS/DEC15/Sardine/BG7. Incorporating parasite data in population structure studies of South African sardine Sardinops sagax.
MARAM/IWS/DEC15/Sardine/BG8. Update on the processing for ``tetracotyle'' type metacercariae of sardine from commercial catch samples, 2011-2014, and preliminary analyses thereof.

Slides and presentations

An overview of the key issues to be discussed relating to the South African sardine two-mixing-stock hypothesis (corrected). Carryn de Moor.
Using a parasite bio-tag to examine population structure of SA sardine. Carl van der Lingen.

Working Papers

MARAM/IWS/DEC15/Sardine/WP1. November survey length frequency data.
MARAM/IWS/DEC15/Sardine/WP2/revised. Sardine stock-recruitment relationships.
MARAM/IWS/DEC15/Sardine/WP3. Comparing year-average prevalence-at-length and abundance-at-length plots for western and southern sardine following exclusion of data from the presumed ``mixing zone''.
MARAM/IWS/DEC15/Sardine/WP5. The phases in which parameters were estimated for MARAM/IWS/DEC15/Sardine/P3.

Penguins - Detection of closure effect on birds

Primary papers

MARAM/IWS/DEC15/PengD/P1. Specifications for operating models to evaluate bias in estimation methods in accordance with recommendation A.1 of the 2014 International Review panel.
MARAM/IWS/DEC15/PengD/P2. Consolidated analyses produced in implementation of the approaches described in document MARAM/IWS/DEC15/PengD/P1.
MARAM/IWS/DEC15/PengD/P3. Penguin power analysis methodology - Draft.
MARAM/IWS/DEC15/PengD/P4. Simulation testing of penguin closure effect response estimators - Where next?
MARAM/IWS/DEC15/PengD/P5. Chair's overview of progress in the simulation testing of penguin closure effect response estimators as reported in MARAM/IWS/DEC15/PenguinD/P1-4

Background documents

MARAM/IWS/DEC15/PengD/BG1. The current set of available data for evaluation of the Island Closure Feasibility study.
MARAM/IWS/DEC15/PengD/BG2. A note on the extent of autocorrelation of residuals in the GLM analyses of penguin response variables in the feasibility study.
MARAM/IWS/DEC15/PengD/BG3. On plans for penguin analyses arising from some of the IWC panel: Recommendations.
MARAM/IWS/DEC15/PengD/BG4. Suggestions re further penguin power analysis and estimator simulation tests in response to panel recommendations.
MARAM/IWS/DEC15/PengD/BG5. Progress in relation to penguin recommendations by the international review panel for the 2014 International Fisheries Stock Assessment workshop 1-5 December 2014, UCT.
MARAM/IWS/DEC15/PengD/BG6. Workshop report: meeting on the future of the Island Closures study.

Slides and Presentations

Panel Introduction - PROGRESS IN THE SIMULATION TESTING OF PENGUIN CLOSURE (corrected). Kevern Cochrane.

Documents requested during the workshop

MARAM/IWS/DEC14/Peng/B4. Analyses of the Results from the Island Closure Feasibility Study for the Dassen/Robben and St Croix/Bird Island Pairs.
MARAM/IWS/DEC14/Peng/B6. An analysis of the small scale surveys of anchovy abundance around Robben and Dassen islands from 2009 to 2013.
MARAM/IWS/DEC14/Peng/B9. Do catch-based indices provide a reliable index of annual recruitment for the South African anchovy population?
Diet Information: Crawford, R.J.M., Altwegg, R., Barham, B.J., Barham, P.J., Durant, J.M., Dyer, B.M., Geldenhuys, D., Makhado, A.B., Pichegru, L., Ryan, P.G., Underhill, L.G., Upfold, L., Visagie, J., Waller, L.J. and Whittington, P.A. Collapse of South Africa's penguins in the early 21st century, African Journal of Marine Science, 33(1): 139 - 156 (2011).
MARAM/IWS/DEC15/PengD/WP1. Comparison of anchovy and sardine catches within 10 nm from Robben Island with those in the same years from Dassen Island.
MARAM/IWS/DEC15/PengD/WP2. Requested Correlation Plots.

Penguins - Impact of closure on industry

Primary papers

MARAM/IWS/DEC15/PengI/P1. Final Report: The economic impact of penguin island closures on the pelagic fishing industry: Extract for the Panel.

Slides and Presentations

Opportunity based model component of ``The economic impact of penguin island closures on the pelagic fishing industry''. Mike Bergh.

Documents requested during the workshop

MARAM/IWS/DEC15/PengI/WP1. Industry strategy for anchovy fishing from main west coast.
MARAM/IWS/DEC15/PengI/WP2. Summary of days fished in area that is closed around Dassen in years it is open.
MARAM/IWS/DEC15/PengI/WP3. Additional calculations requested 30 November 2015 for the Opportunity Based Model.
MARAM/IWS/DEC15/PengI/WP4. Further calculations requested 1 December 2015 for the Opportunity Based Model.

EAF

EAF - Time to drop the term. Doug Butterworth.
EAF - No one said it was going to be easy. Kevern Cochrane.