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International Fisheries Stock Assessment Review Workshop

2018 Workshop

General:

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

 

Past workshop panel reports

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007


Hake

Primary papers

P1:  Rademeyer, R.A., Butterworth, D.S. and Ross-Gillespie, A. 2018. Specifications of the South African Hake 2018 Reference Case Assessment
P2: Ross-Gillespie, A., Butterworth, D.S. and Durholtz, D. 2018. Bridge-building between the 2017 and 2018 hake RC assessment models.

P3: Ross-Gillespie, A. and Butterworth, D.S. 2018. Specification and conditioning of the hake OMP2018 Reference Set models

P4: Ross-Gillespie, A. and Butterworth, D.S. 2018. Projection results for OMP2018, as well as other CMPs tested.
P5: Ross-Gillespie, A. and Butterworth, D.S. 2018. List of possible robustness tests for the 2018 OMP review.
P6a: Ross-Gillespie, A. and Butterworth, D.S. 2018. First set of robustness tests conducted for OMP2018.
P6b: Ross-Gillespie, A. and Butterworth, D.S. 2018. Second set of robustness tests conducted for OMP2018.
P7: Ross-Gillespie, A. and Butterworth, D.S. 2018. Exploration of a safe-guard metarule for OMP2018 in the eventuality that the M. capensis CPUE and survey indices drop too low.
P8: Olrac. 2018. Background to the species splitting model adopted for the development of OMP-18.
P9: Questions to panel.

Background documents

BG1: Hake document list for IWS 2018, with additional comments linking the documents to the key questions addressed to the Panel.
BG2: Responses to 2017 Panel recommendations
BG3: Durholtz, M.D. 2018. An overview of the SA hake fishery.
BG4: Ross-Gillespie, A., Butterworth, D.S., Glazer, J.P. and Fairweather, T.P. 2018. The 2018 Operational Management Procedure for the South African Merluccious paradoxus and M. capensis. DAFF Fisheries Branch document FISHERIES/2018/OCT/SWG-DEM/73.
BG5: Winker, H. 2018. A state-space approach to approximate changes in trawl survey catchability for Merluccius paradoxus and M. capensis. DAFF Fisheries Branch document FISHERIES/2018/SEP/SWG-DEM/45.
BG6: Glazer, J.P. 2018. Updated hake standardized CPUE indices of abundance (1978-2917). DAFF Fisheries Branch document FISHERIES/2018/OCT/SWG-DEM/57.

BG7: Ross-Gillespie, A. and Butterworth, D.S. 2018. Update on the MARAM hake predation model, focusing on the natural mortality-at-age vectors to be used for the Reference Set of Operating Models for the 2018 Hake OMP review. DAFF Fisheries Branch document FISHERIES/2018/MAR/SWG-DEM/11.

BG8: A. Ross-Gillespie and D.S. Butterworth. Testing an alternative CMP approach where the 2019 and 2020 TACs are fixed at 10% above the 2018 value.

Slides and presentations

An overview of the SA hake fishery.

Working papers

WP1: A. Ross-Gillespie and D.S. Butterworth. Comparison of the hake RC OM with the whole RS. 
WP2: A. Ross-Gillespie. Conditioning results for RT6.  
WP3: A. Ross-Gillespie. Additional robustness tests concerning no future surveys.  
WP4: M. Bergh. Corrections applied to the hake assessment ADMB code circa April 2017, and circa January 2018.  
WP5: A. Ross-Gillespie. Various additional hake output as requested by the Panel.  
WP6: A. Ross-Gillespie. Hake RC convergence statistics.  
WP7: A. Ross-Gillespie. Investigation into the small female spawning biomass estimated for M. paradoxus.  
WP8: A. Ross-Gillespie. Likelihood profile for h and a fit of the RC model excluding the early CPUE data.  


West Coast rock lobster

Primary papers

P1: Brandão, A., Butterworth, D.S. and Johnston, S.J. 2018. Refined trends in poaching for West Coast rock lobster based upon information from the DAFF compliance “new” database for the period 2012 to 2017, and final poaching trends used for updated assessments and projections.
P2: Johnston S.J. and Butterworth, D.S 2018. The size-structured (length based) stock assessment methodology applied to west coast rock lobster.
P3: Johnston S.J. and Butterworth, D.S 2018. Updated 2018 west coast rock lobster assessments.
P4: Johnston S.J. and Butterworth, D.S 2018. Projections of the west coast rock lobster resource under different poaching and future catch scenarios.
P5: Butterworth, D.S 2018. On options for the basis for future West Coast Rock Lobster TAC advice.
P6: Questions to panel.

Background documents

BG1: Johnston S.J. and Butterworth, D.S 2018. A summary of the west coast rock lobster fishery.
BG2: Johnston S.J. 2018. West Coast Rock Lobster: Responses to previous Panel Recommendations.
BG3. Johnston S.J. and Butterworth, D.S 2018. The Consequences of Different Inshore/Offshore splits of the WCRL TAC.
BG4: Johnston, S.J. and Butterworth, D.S. 2018. West Coast Rock Lobster document list for IWS 2018, with additional comments linking the documents to the key questions addressed to the Panel.

Slides and presentations

WCRL introductory presentation.

Working papers

WP1: Johnston S.J. Projections under zero catches (both legal and illegal) for WCRL A5+6 and A8+.
WP2: Johnston S.J. Various requested model outputs for west coast rock lobster .


Linefish

Primary papers

P1: Key questions to the panel. 
P2: Winker, H., Carvalho, FC, Thorson, J.T., Parker, D., Kerwath. S.E., Booth, A.J., Kell, L. 2018. JABBA-Select: an alternative surplus production model to account for changes in selectivity and relative mortality from multiple fisheries.
P3: Winker, H. 2018. Investigation into the process error in biomass dynamics of fishes.

Background documents

BG1: Parker, D., Winker, H., Kerwath, S.E., Attwood, C.G. 2018. An Overview of the South African Linefish fishery.
BG2: Linefish document list for IWS 2018, with additional comments and background linking the documents to the key questions addressed to the Panel.

Slides and presentations

Linefish presentation_P2a: JABBA-Select: Model Documentation
Linefish presentation_P2bREV: JABBA-Select: Simulation-Testing
Linefish presentation_P3: SPM process error.  

Working papers

WP1: Butterworth, D.S. Questions Re Jabba Model Application. 


Sardine

Primary papers

P1: List of Key Questions for the Panel Regarding Sardine.
P2: C.L. de Moor. Recruitment variability estimated by the sardine assessment model.
P3: Bergh, M.O. 2018. A simulation schema for projections of West Coast sardine recruitment. 
P4: Bergh, M.O. 2018. Factors influencing the relationship between beta and p at a constant value of leftward shift.
P5: Butterworth, D.S. 2018. On difficulties in interpreting measures of risk in trade-off situations.

Background documents

BG1: J.C. Coetzee, C.L. de Moor and D.S. Butterworth. A summary of the South African sardine (and anchovy) fishery.
BG2: Progress on recommendations from the 2017 review panel report.
BG3: Sardine document list for IWS 2018, with additional comments linking the documents to the key questions addressed to the Panel.
BG4: C.L. de Moor. M. Bergh. D.S. Butterworth. J.C. Coetzee. C.D. van der Lingen. Density dependent movement of South African sardine.

Slides and presentations

A summary of the South African sardine resource and fishery.

Working papers

WP1: C.L.de Moor. The relationship between “leftward shift”, risk and the Harvest Control Rule control parameter for sardine.