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2018

PowerPoint Presentations

de Moor, C.L.  2018. Considering the variability in directed sardine catches for the current OMP-18 reference case HCR. Presentation to the Small Pelagic Scientific Working Group, Cape Town, 11 April 2018. 7pp.

Tristan

Johnston, S.J. and Butterworth, D.S.  2018. The final OMP (2017) recommended for Nightingale. MARAM document: MARAM/TRISTAN/2018/JAN/01: 2pp.
Johnston, S.J.  2018. Tristan Group Biomass Survey (Leg 1) results including data from the 2017 season. MARAM document: MARAM/TRISTAN/2018/JAN/02: 16pp.
Johnston, S.J. 2018. Summary of OMP development and implementation schedule for Tristan rock lobster. MARAM document: MARAM/TRISTAN/2018/JAN/03: 1pp.
Johnston, S.J. and Butterworth, D.S. 2018. Updated 2018 GLMM standardised lobster CPUE from the Tristan da Cunha outer group of islands. MARAM document: MARAM/TRISTAN/2018/MAR/04: 14pp.
Johnston, S.J. and Butterworth, D.S. Updated (and rescaled) Tristan GLM-standardised lobster CPUE to take account of data for the 2017 season. MARAM document: MARAM/TRISTAN/2018/MAY/05: 10pp.
Johnston, S.J. and Butterworth, D.S. 2018. 2018 GLMM-standardised Tristan lobster CPUE compared with the current OMP target levels (Itar). MARAM document: MARAM/TRISTAN/2018/MAY/06: 3pp.
Johnston, S.J. and Butterworth, D.S. 2018. Updated 2018 Inaccessible and Gough island assessments. MARAM document: MARAM/TRISTAN/2018/JUL/08: 20pp.

Consultancy and Other Activities Based on Expertise Developed in Research

Brandão, A. and Butterworth, D.S.   2018. Investigation of the assumed similar efficiency of policing effort types for West Coast rock lobster. DAFF Branch Fisheries document: FISHERIES/2018/APR/WCRL/04: 4pp.
Brandão, A. and Butterworth, D.S. 2018. Updated analyses of the Fisheries Independent Monitoring Survey data of the rock lobster resource of South Africa to include the 2017/18 season. DAFF Branch Fisheries document: FISHERIES/2018/JUL/SWG-WCRL/14: 19pp.
Brandão, A. and Butterworth, D.S.  2018. Results for the updated trends in policing effort and the number of confiscations for west coast rock lobster using the “old” database for the period 2008 to 2017. DAFF Branch Fisheries document: FISHERIES/2018/AUG/SWG-WCRL/16: 17pp.
Brandão, A. and Butterworth, D.S.   Investigation of the comparability of the west coast rock lobster compliance databases (“new” and “old”). DAFF Branch Fisheries document: FISHERIES/2018/AUG/SWG-WCRL/17: 4pp.
Brandão, A. and Butterworth, D.S.  2018. Refined trends in poaching for west coast rock lobster using information from the “new” databases for the period 2012 to 2017. DAFF Branch Fisheries document: FISHERIES/2018/AUG/SWG-WCRL/18: 9pp.
Brandão, A. and Butterworth, D.S.  2018. Analysis of tagging data of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity. DAFF Branch Fisheries document: FISHERIES/2018/MAR/SWG-DEM/14: 6pp.
Brandão, A. and Butterworth, D.S. 2018. Further analysis of tagging data of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands region. DAFF Branch Fisheries document: FISHERIES/2018/AUG/SWG-DEM/37: 4pp.
Brandão, A. and Butterworth, D.S. 2018. Compilation of tasks needed and decisions taken for the development of an OMP for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands region. DAFF Branch Fisheries document: FISHERIES/2018/AUG/SWG-DEM/38:7pp.
Brandão, A. and Butterworth, D.S. 2018. GLMM standardised trotline CPUE series to be used as input to develop Operating Models for toothfish (Dissostichus eleginoides) in the Prince Edward Islands EEZ. DAFF Branch Fisheries document: FISHERIES/2018/SEP/SWG-DEM/47: 8pp.
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. MARAM/IWS/2018/WCRL/P1: 20pp.
Brandão, A. and Butterworth, D.S. 2018. Assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward islands vicinity to include data from 1997 to 2017. DAFF Branch Fisheries document: FISHERIES/2018/OCT/SWG-DEM/60: 37pp.
Brandão, A. and Butterworth, D.S. 2018. Stochastic projections for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity. DAFF Branch Fisheries document: FISHERIES/2018/OCT/SWG-DEM/66: 5pp.
Butterworth, D.S.  2018. Towards the development of an OMP for the Prince Edward Island Patagonian toothfish fishery. DAFF Branch Fisheries document: FISHERIES/2018/MAR/SWG-DEM/PTTT/02: 1pp.
Butterworth, D.S. 2018. Comments on /Sherley et al. 2018. DAFF Branch Fisheries document: FISHERIES/2018/JUL/SWG-PEL/18: 2pp.
Butterworth, D.S., Glazer, J.P., Johnston, S.J. and van Zyl, D. 2018. Adjustments made to recent catches and CPUE for west coast rock lobster in areas 3+4 and 5+6. DAFF Branch Fisheries document: FISHERIES/2018/AUG/SWG-WCRL/15: 4pp.
Butterworth, D.S. 2018. On difficulties in interpreting probability-based measures of risk in trade-off situations. MARAM/IWS/2018/Sardine/P5: 2pp.
Butterworth, D.S. 2018. On options for the basis for future west coast rock lobster TAC advice. MARAM/IWS/2018/WCRL/P5: 8pp.
Coetzee, J.C., de Moor, C.L. and Butterworth, D.S. 2018. A summary of the South African sardine (and anchovy) fishery. MARAM/IWS/2018/Sardine/BG1: 13pp.
de Moor, C.L. 2018. Posterior distributions for the South African sardine assessment. DAFF Branch Fisheries document: FISHERIES/2018/MAR/SWG-PEL/01: 7pp.
de Moor, C.L., Bergh, M., Butterworth, D.S., Coetzee, J.C. and van der Lingen, C.D. 2018. Density dependent movement of South African sardine. DAFF Branch Fisheries document: FISHERIES/2018/MAR/SWG-PEL/02: 5pp. (Also MARAM/IWS/2018/Sardine/BG4)
de Moor, C.L. 2018. Some comparisons against a reference sardine harvest control rule for OMP-18. DAFF Branch Fisheries document: FISHERIES/2018/MAR/SWG-PEL/03: 13pp.
de Moor, C.L. and Butterworth, D.S. 2018. Generating the future proportion of directed sardine catch taken west of Cape Agulhas in the absence of explicit spatial management. DAFF /Branch Fisheries document: FISHERIES/2018APR/SWG-PEL/05: 3pp.
de Moor, C.L. 2018. Considering alternative constraints to the anchovy Harvest Control Rule. DAFF Branch Fisheries document: FISHERIES/2018/APR/SWG-PEL/06: 7pp.
de Moor, C.L. 2018. OMP-18 development: alternative constraints on the sardine Harvest Control Rule. DAFF Branch Fisheries document: FISHERIES/2018/MAY/SWG-PEL/07rev: 11pp.
de Moor, C.L. 2018. OMP-18 development: alternative constraints relating to the sardine Critical Biomass metarule. DAFF Branch Fisheries document: FISHERIES/2018/MAY/SWG-PEL/12rev: 16pp.
de Moor, C.L. 2018. OMP-18 development: simple sardine Harvest Control Rules. DAFF Branch Fisheries document: FISHERIES/2018/JUN/SWG-PEL/14REV: 9pp.
de Moor, C.L. 2018. OMP-18 development: constraints on inter-annual decreases in sardine TACs. DAFF Branch Fisheries document: FISHERIES/2018/JUL/SWG-PEL/15: 6pp.
de Moor, C.L. 2018. OMP-18 development: linear smoothing for the sardine HCR. DAFF Branch Fisheries document: FISHERIES/2018/JUL/SWG-PEL/16: 6pp.
de Moor, C.L. 2018. OMP-18 development: selecting an interim Harvest Control Rule for directed sardine. DAFF Branch Fisheries document: FISHERIES/2018/JUL/SWG-PEL/17: 9pp.
de Moor, C.L. 2018. Multiple sardine Operating Models and associated risk. DAFF Branch Fisheries document: FISHERIES/2018/AUG/SWG-PEL/19: 14pp.
de Moor, C.L. 2018. Final anchovy TAC and small pelagic TABs for 2018. DAFF Branch Fisheries document: FISHERIES/2018/JUL/SWG-PEL/20: 3pp.
de Moor, C.L. 2018. Interim OMP-18: the directed sardine Harvest Control Rule. DAFF Branch Fisheries document: FISHERIES/2018/AUG/SWG-PEL/22: 14pp.
de Moor, C.L. 2018. Interim OMP-18. DAFF Branch Fisheries document: FISHERIES/2018/AUG/SWG-PEL/24: 13pp.
de Moor, C.L. 2018. Recruitment to the south component of South African sardine. DAFF Branch Fisheries document: FISHERIES/2018/SEP/SWG-PEL/25: 6pp.
de Moor, C.L. 2018. Simulation testing framework used during OMP-18 development. DAFF Branch Fisheries document: FISHERIES/2018/SEP/SWG-PEL/27: 26pp.
de Moor, C.L. 2018. ‘Red flag’ proposals to be linked to implicit spatial management of the South African sardine resource. DAFF Branch Fisheries document: FISHERIES/2018/OCT/SWG-PEL/28REV: 26pp.
de Moor, C.L. 2018. OMP-18 baseline sardine Operating Model proposal. DAFF Branch Fisheries document: FISHERIES/2018/OCT/SWG-PEL/34: 5pp.
de Moor, C.L. de Moor, C.L. 2018. Further results towards finalising HCRs for OMP-18. DAFF Branch Fisheries document: FISHERIES/2018/NOV/SWG-PEL/36: 21pp.
de Moor, C.L. 2018. Initial Directed Anchovy TAC and Sardine and Anchovy TABs for 2019, Using OMP-18. DAFF: Branch Fisheries Document FISHERIES/2018/DEC/SWG-PEL/39. 4pp.
Glazer, J.P. and Butterworth, D.S. 2018. Exploratory analyses of the Agulhas sole assessment. DAFF Branch Fisheries document: FISHERIES/2018/MAR/SWG-DEM/13: 10pp.
Glazer, J.P. and Butterworth, D.S. 2018. An updated assessment of the Agulhas sole resource, Austroglossus pectoralis. DAFF Branch Fisheries document: FISHERIES/2018/OCT/SWG-DEM/65: 10pp.
Johnston, S.J. 2018. South coast rock lobster TAC for the 2018/19 season. DAFF Branch Fisheries document: FISHERIES/2018/JUL/SWG-SCRL/04: 2pp.
Johnston, S.J. 2018. West coast rock lobster allocation for the 2017/18 season. DAFF Branch Fisheries document: FISHERIES/2018/MAR/WCRL/TT01: 4pp.
Johnston, S.J. and Butterworth, D.S. 2018. Suggested assumptions to be used for projections of the 2018 updated stock assessment modes in under alternate future TACs. DAFF Branch Fisheries document: FISHERIES/2018/APR/SWG-WCRL/02: 4pp.
Johnston, S.J. and Butterworth, D.S. 2018. Updated 2018 west coast rock lobster assessment results and associated biomass projections under a range of constant future legal catch levels. DAFF Branch Fisheries document: FISHERIES/2018/AUG/SWG-WCRL/23_REV: 28pp.
Johnston, S.J. and Butterworth, D.S. 2018. Further 2018 west coast rock lobster assessment and associated biomass projections results. DAFF Branch Fisheries document: FISHERIES/2018/AUG/SWG-WCRL/25: 9pp.
Johnston, S.J. and Butterworth, D.S. 2018. Addendum to: Further 2018 west coast rock lobster assessment and associated biomass projections results. DAFF Branch Fisheries document: FISHERIES/2018/AUG/SWG-WCRL/25_Addendum: 3pp.
Johnston, S.J. and Butterworth, D.S. 2018. Horse mackerel stock assessment plans for 2018. DAFF Branch Fisheries document: FISHERIES/2018/SEP/SWG-DEM/44: 8pp.
Johnston, S.J. and Butterworth, D.S. 2018. 2018 Updated horse mackerel assessments. DAFF Branch Fisheries document: FISHERIES/2018/OCT/SWG-DEM/54_REV: 18pp.
Johnston, S.J. and Butterworth, D.S. 2018. The size-structured (length-based) stock assessment methodology applied to west coast rock lobster. MARAM/IWS/2018/WCRL/P2: 14pp.
Johnston, S.J. and Butterworth, D.S. 2018. 2018 updated west coast rock lobster assessments. MARAM/IWS/2018/WCRL/P3: 56pp.
Johnston, S.J. and Butterworth, D.S. 2018. Projections of the west coast rock lobster resource under different poaching and future catch scenarios. MARAM/IWS/2018/WCRL/P4: 14pp.
Johnston, S.J. and Butterworth, D.S. 2018. A summary of the west coast rock lobster fishery. MARAM/IWS/2018/WCRL/BG1: 10pp.
Johnston, S.J. and Butterworth, D.S. 2018. The consequences of different inshore/offshore splits of the WCRL TAC. MARAM/IWS/2018/WCRL/BG3: 16pp.
Mwicigi, J., Durholtz, D., Glazer, J. and Butterworth, D.S. 2018. Considerations on management of the chokka squid jig fishery with reference to the pending FRAP 2020 allocation of fishing rights and implementation of Small Scale Fisheries. DAFF Branch Fisheries document: FISHERIES/2018/AUG/SWG-SQ/17: 8pp.
Ross-Gillespie, A. and Butterworth, D.S. 2018. Investigating the suitability of the negative log-likelihood term for the catch-at-length data in the hake assessment model. DAFF Branch Fisheries document: FISHERIES/2018/FEB/SWG-DEM/05: 9pp.
Ross-Gillespie, A. and Butterworth, D.S. 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 Branch Fisheries document: FISHERIES/2018/MAR/SWG-DEM/11. 13pp. (Also MARAM/IWS/2018/Hake/BG7)
Ross-Gillespie, A., Butterworth, D.S. and Durholtz, D. 2018. Bridge-building between the 2017 and 2018 hake RC assessment models. DAFF Branch Fisheries document: FISHERIES/2018/MAY/SWG-DEM/20: 7pp.
Ross-Gillespie, A. and Butterworth, D.S. 2018. Conditioning of the hake OMP2018 Reference Set models. DAFF Branch Fisheries document: FISHERIES/2018/MAY/SWG-DEM/21: 12pp.
Ross-Gillespie, A. and Butterworth, D.S. 2018. Conditioning of the hake OMP2018 Reference Set models with the Model A6b input data. DAFF Branch Fisheries document: FISHERIES/2018/JUL/SWG-DEM/28rev: 18pp.
Ross-Gillespie, A. and Butterworth, D.S. 2018. Details of updates made to the Reference Case specifications from the time of the 2017 MSC audit. DAFF Branch Fisheries document: FISHERIES/2018/JUL/SWG-DEM/32: 4pp.
Ross-Gillespie, A. and Butterworth, D.S. 2018. Constant catch projections for the RS for the 2018 hake OMP review. DAFF Branch Fisheries document FISHERIES/2018/Aug/SWG-DEM/35: 23pp.
Ross-Gillespie, A. and Butterworth, D.S. 2018. List of possible robustness tests for the 2018 OMP review. DAFF Branch Fisheries document FISHERIES/2018/Aug/SWG-DEM/36: 8pp. (Also MARAM/IWS/2018/Hake/P5)
Ross-Gillespie, A. and Butterworth, D.S. 2018. Some initial projections under the OMP2014 rules. DAFF Branch Fisheries document FISHERIES/2018/SEP/SWG-DEM/43: 11pp.
Ross-Gillespie, A. and Butterworth, D.S. 2018. Some initial projections under the OMP2014 rules averaged over all the Operating Models in the Reference Set. DAFF Branch Fisheries document FISHERIES/2018/SEP/SWG-DEM/46: 16pp.
Ross-Gillespie, A. and Butterworth, D.S. 2018. Initial exploration of oscillations in the projections of exploitable biomass. DAFF Branch Fisheries document FISHERIES/2018/SEP/SWG-DEM/48: 4pp.
Ross-Gillespie, A. and Butterworth, D.S. 2018. Results for the first few robustness tests for the hake OMP2018 review. DAFF Branch Fisheries document FISHERIES/2018/OCT/SWG-DEM/58: 15pp.
Ross-Gillespie, A. and Butterworth, D.S. 2018. Possible statistics for evaluating OMP performance with respect to catch projections. DAFF Branch Fisheries document FISHERIES/2018/OCT/SWG-DEM/59: 3pp.
Ross-Gillespie, A. and Butterworth, D.S. 2018. Testing an alternative CMP approach where the 2019 and 2020 TACs are fixed at 10% above the 2018 value. DAFF Branch Fisheries document FISHERIES/2018/OCT/SWG-DEM/61: 6pp. (Also MARAM/IWS/2018/Hake/BG8)
Ross-Gillespie, A. and Butterworth, D.S. 2018. Results for the revised set of CMPs, including a CMP with no cap. DAFF Branch Fisheries document FISHERIES/2018/OCT/SWG-DEM/67: 14pp.
Ross-Gillespie, A. and Butterworth, D.S. 2018. Some more hake CMP robustness test results: original natural mortality-at-age vectors and decreasing carrying capacity. DAFF Branch Fisheries document FISHERIES/2018/OCT/SWG-DEM/68: 8pp.
Ross-Gillespie, A. and Butterworth, D.S. 2018. Full set of results for the CMP recommended to be adopted for OMP2018, including for the robustness tests conducted thus far. DAFF Branch Fisheries document FISHERIES/2018/OCT/SWG-DEM/71: 12pp.
Ross-Gillespie, A., Butterworth, D.S., Glazer, J.P. and Fairweather, T.P. 2018. The 2018 Operational Management Procedure for the South African Merluccius paradoxus and M. capensis resources. DAFF Branch Fisheries document: FISHERIES/2018/OCT/SWG-DEM/73: 29pp.(Also MARAM/IWS/2018/Hake/BG4)
Ross-Gillespie, A. and Butterworth, D.S. 2018. Bridge-building between the 2017 and 2018 hake RC assessment models. MARAM/IWS/2018/Hake/P2rev: 22pp.
Ross-Gillespie, A. and Butterworth, D.S. 2018. Specification and conditioning of the hake OMP2018 Reference Set models. MARAM/IWS/2018/Hake/P3rev: 25pp.
Ross-Gillespie, A. and Butterworth, D.S. 2018. Projection results for OMP2018, as well as other CMPs tested. MARAM/IWS/2018/Hake/P4: 20pp.
Ross-Gillespie, A. and Butterworth, D.S. 2018. First set of robustness tests conducted for OMP2018. MARAM/IWS/2018/Hake/P6arev: 13pp.
Ross-Gillespie, A. and Butterworth, D.S. 2018. Second set of robustness tests conducted for OMP2018. MARAM/IWS/2018/Hake/P6b: 26pp.
Ross-Gillespie, A. and Butterworth, D.S. 2018. Exploration of a safe-guard criterion for OMP2018 in the eventuality that the M. capensis CPUE and survey indices of abundance drop too low. MARAM/IWS/2018/Hake/P7: 4pp.