Research Output
2016
Research Papers and Refereed Articles
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Allison, C. and de Moor, C.L. Conditioning results for North Atlantic minke whales Implementation Simulation Trials. Journal of Cetacean Res. Management, 17(Suppl.): 170-177. |
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Butterworth, D.S. The South African Experience with MSC Certification: A perspective. Fisheries Research, 182: 124-127. |
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Carruthers, T.R., Kell, L.T., Butterworth, D.S., Maunder, M.N, Geromont, H.F., Walters, C., McAllister, M.K., Hillary, R., Levontin, P., Kitakado, T. and Davies, C.R. Performance review of simple management procedures. ICES Journal of Marine Science, 73(2): 464-482. |
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Gutierrez, N.L., Defeo, O., Bush, S.R., Butterworth, D.S., Roheim, C.A. and Punt, A.E. The current situation and prospects of fisheries certification and ecolabelling. Fisheries Research, 182: 1-6. |
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Hillary, R.M., Preece, A.L., Davies, C.R., Kurota, H., Sakai, O., Itoh, T., Parma, A.M., Butterworth, D.S., Ianelli, J. and Branch, T.A. A scientific alternative to moratoria for rebuilding depleted international tuna stocks. Fish and Fisheries, 17(2): 469–482. |
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Punt, A., Butterworth, D.S., de Moor, C.L., De Oliveira, J. and Haddon, M. Management Strategy Evaluation: Best Practices. Fish and Fisheries, 17(2): 303-334. |
Advanced Access
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Best. P., Tormosov, D., Brandão, A. and Mikhalev, Y. Geographical variation in the body size of adult female sperm whales (Physeter macrocephalus) - an example of McNab's resource rule. Mammalia. 14pp. doi: 10.1515/mammalia-2015-0042. |
Non-Peer reviewed published Conference Proceedings
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Carruthers, T., Kimoto, A., Powers, J., Kell, L., Butterworth, D.S., Lauretta, M.V. and Kitakado, T. Structure and estimation framework for Atlantic Bluefin tuna operating models. SCRS/2015/179: Collect. Vol. Sci. Pap. ICCAT, 72(7): 1782 - 1795. |
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Rademeyer, R.A. and Butterworth, D.S. An illustrative example of a management procedure for Eastern North Atlantic Bluefin tuna. SCRS/2015/167: Collect. Vol. Sci. Pap. ICCAT, 72(7): 1667 - 1693. |
PowerPoint Presentations
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Butterworth, D.S. An honest appraisal of management strategy evaluation (MSE). Presentation to the 7th World Fisheries Congress, Busan, South Korea, 23-27 May 2016: 31pp. |
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Butterworth, D.S. Ecolabeling Background. Presentation to the International Fisheries Stock Assessment Workshop, Cape Town, 28 Nov - 2 Dec 2016: 11pp. |
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Butterworth, D.S. South Africa's MPA expansion strategy: Do we need additional MPAs, most of which are to be no-fisheries-take zones? Presentation to SADSTIA debate “MPAs – do we need them“, Two Oceans Aquarium, Cape Town, 26 August 2016: 9pp. |
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Butterworth, D.S. The future of South African fisheries, policy and implementation challenges. Invited presentation to FishSA AGM, 23 June 2016: 10pp. |
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Danielsdottir, K., Ross-Gillespie A. and Butterworth D.S. Co-creating ecosystem based fisheries management solutions. Presentation to the SA-EU Marine and Polar Research Collaboration Workshop, Cape Town, S.A., 4 October 2016: 18pp. |
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de Moor, C.L., Butterworth, D.S. and van der Lingen, C. Using parasite data to quantify multi-stock hypotheses. Presentation to the 7th World Fisheries Congress, Busan, South Korea, 23-27 May 2016: 33pp. |
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de Moor, C.L., Butterworth, D.S. and Coetzee, J. Assessment and management of the South African Purse-Seine fishery for small pelagics (sardine, anchovy and round-herring). Presentation to the NOAA Southwest Fisheries Science Centre & PFMC Workshop on Coastal Pelagic Species Assessments, La Jolla, 3 May 2016: 46pp |
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de Moor, C.L. Introduction to South African sardine: Assessment and Management. Presentation to the International Stock Assessment Workshop, Cape Town, 28 Nov – 2 Dec 2016: MARAM/IWS/DEC16/Sardine 2: 31pp. |
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De Oliveira, J., Butterworth, D.S., Nielsen, A., Earl, T., Rademeyer, R. and Berg, C. A simulation scheme conditioned on data for testing & comparing assessment methods. Presentation to the 7th World Fisheries Congress, Busan, South Korea, 23-27 May 2016: 21pp. |
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Geromont, H.F. Management of datapoor stocks in mixed fisheries: the good, the adequate and the arbitrary. Presentation to IMARES/ICM-CSIC seminar, Barcelona, Spain, 6-8 September, 2016: 55pp. |
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Plagányi, É.E., Tulloch, V., van Putten, I, Hobday, A., Blamey, L., Butterworth, D.S. and Robinson, W. Quantifying climate-smart management responses to shifting marine species distributions. Presentation to the Species on the Move International Conference, Hobart, Tasmania, 9-12 February, 2016: 19pp. |
Gulf of Maine - Georges Bank Witch Flounder
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Butterworth, D.S. and Rademeyer, R.A. Response to reviewer requests in regard to the impact of selectivity doming in the preferred SCAA model. Document submitted to the NEFSC Witch Flounder SARC meeting, Woods Hole, 29 November – 2 December 2016: 4pp. |
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Butterworth, D.S. and Rademeyer, R.A. Further remarks on Gulf of Maine-Georges Bank witch flounder assessment results. Document submitted to the NEFSC Witch Flounder SARC meeting, Woods Hole, 29 November – 2 December 2016: 13pp. |
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Butterworth, D.S. and Rademeyer, R.A. Appendix B2. Replacement yield model assessments of Gulf of Maine-Georges Bank witch flounder. Appendix to NEFSC SAW 62 Witch Flounder Working paper B1-B: Stock Assessment of Witch Flounder for 2016: 436-444 |
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Butterworth, D.S. and Rademeyer, R.A. Appendix B3. Exploratory catch-at-age assessments of Gulf of Maine-Georges Bank witch flounder. Appendix to NEFSC SAW 62 Witch Flounder Working paper B1-B: Stock Assessment of Witch Flounder for 2016: 445-483 |
Southern Bluefin Tuna
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Takahashi, N., Kurota, H., Sakai, O., Itoh, T. and Butterworth, D.S. A check of operating model predictions from the viewpoint of the Management Procedure implementation in 2016. Southern bluefin tuna document. CCSBT-ESC/1609/29: 8pp. |
ICCAT Bluefin Tuna
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Butterworth, D.S., Carruthers, T.R. and Rademeyer, R.A. Specifications for MSE trials for Bluefin tuna in the North Atlantic. Document prepared for the ICCAT Atlantic Bluefin MSE meeting in Monterey, USA, 21-23 January 2016: 42pp. |
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Butterworth, D.S. and Rademeyer, R.A. Statistical catch at length assessment methodology for Atlantic Bluefin tuna. Document prepared for the ICCAT Atlantic Bluefin MSE meeting in Madrid, Spain, 25-29 July 2016. SCRS/2016/152: 19pp. |
Tristan
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Butterworth, D.S. and Johnston, S.J. Recommendations on rock lobster TACs for the Tristan group of islands for the 2016/17 season. MARAM document. MARAM/TRISTAN/2016/JUN/11: 10pp. |
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Johnston, S.J. and Butterworth, D.S. Updated 2016 Reference Case Tristan da Cunha rock lobster assessment. MARAM document. MARAM/TRISTAN/2016/FEB/01: 17pp. |
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Johnston, S.J. Updated observer catch-at-length data from the commercial fisheries at the main Tristan da Cunha island. MARAM document. MARAM/TRISTAN/2016/FEB/02: 6pp. |
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Johnston, S.J. and Butterworth, D.S. Catches taken by the powerboats, the Edinburgh and for the annual biomass surveys at Tristan da Cunha island since 1990. MARAM document. MARAM/TRISTAN/2016/FEB/03: 2pp |
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Johnston, S.J. and Pieterse, R. Nominal CPUE for the catches taken by the Edinburgh off Tristan da Cunha island. MARAM document. MARAM/TRISTAN/2016/FEB/04: 1pp. |
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Johnston, S.J. and Butterworth, D.S. Rescaled Tristan GLM-standardised lobster CPUE to take account of fishing efficiency changes. MARAM document. MARAM/TRISTAN/2016/MAR/05: 12pp. |
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Johnston, S.J. Biomass survey results for Nightingale which include the recent February 2016 leg 2 survey results. MARAM document. MARAM/TRISTAN/2016/APR/06: 6pp. |
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Johnston, S.J. and Butterworth, D.S. Initial results in the development of a new OMP 2016 for Tristan da Cunha island rock lobster. MARAM document. MARAM/TRISTAN/2016/MAY/07: 13pp. |
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Johnston, S.J. and Butterworth, D.S. Updated (and rescaled) Tristan GLM-standardised lobster CPUE to take account of data for the 2015 season. MARAM document. MARAM/TRISTAN/2016/MAY/08: 10pp. |
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Johnston, S.J., Brandão, A. and Butterworth, D.S. Updated 2016 GLMM-standardised lobster CPUE from the Tristan da Cunha outer group of islands. MARAM document. MARAM/TRISTAN/2016/JUN/09: 14pp. |
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Johnston, S.J. and Butterworth, D.S. Updated 2016 Nightingale island rock lobster assessment. MARAM document. MARAM/TRISTAN/2016/JUN/10: 21pp. |
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Johnston, S.J. Rescaling of the daily/monthly nominal Tristan CPUE to make it comparable with the target CPUE level (Itar) used in the OMP. MARAM document. MARAM/TRISTAN/2016/NOV/12: 3pp. |
Consultancy and Other Activities Based on Expertise Developed in Research
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Brandão, A. and Butterworth, D.S. Progress on the testing of decision rules for Zone F. DAFF Branch Fisheries document. FISHERIES/2016/APR/TSKGRP-AB/01: 7pp. |
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Brandão, A. and Butterworth, D.S. Testing of abalone decision rules for Zone F. DAFF Branch Fisheries document. FISHERIES/2016/JUL/SWG-AB/01: 7pp. |
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Brandão, A. and Butterworth, D.S. GLMM standardisation of the commercial abalone CPUE for Zones A-D over the period 1980-2015. DAFF Branch Fisheries document. FISHERIES/2016/AUG/SWG-AB/07: 9pp. |
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Brandão, A. and Butterworth, D.S. Updated GLMM standardisation of the commercial abalone CPUE for Zone F. DAFF Branch Fisheries document. FISHERIES/2016/AUG/SWG-AB/09: 7pp. |
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Brandão, A. and Butterworth, D.S. Results of the updated abalone spatial- and age-structured assessment model and projections for Zones A, B, C and D. DAFF Branch Fisheries document. FISHERIES/2016/AUG/SWG-AB/10: 23pp. |
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Brandão, A. and Butterworth, D.S. Updated analyses of the Fisheries Independent Monitoring Survey data of the Cape Point region rock lobster resource of South Africa to include the 2015/16 season. DAFF Branch Fisheries document. FISHERIES/2016/JUL/SWG-WCRL/09: 10pp. |
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Brandão, A. and Butterworth, D.S. Updated trends in policing effort and the number of confiscations for abalone including compliance data until March 2016. DAFF Branch Fisheries document: FISHERIES/2016/JUL/SWG-AB/06: 9pp. |
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Brandão, A., Johnston, S.J. and Butterworth, D.S. Trends in policing effort and the number of confiscations for West Coast rock lobster. DAFF Branch Fisheries document. FISHERIES/2016/JUL/SWG-WCRL/10 (censored): 23pp. |
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Brandão, A. and Butterworth, D.S. Updated trotline standardised CPUE series for toothfish (Dissostichus eleginoides) in the Prince Edward Islands EEZ to be used as input for the assessment. DAFF Branch Fisheries document. FISHERIES/2016/SEP/SWG-DEM/54: 7pp. |
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Butterworth, D.S. An assignment of probabilities to alternative assumptions concerning the contribution of sardine spawning biomass on the south coast to recruitment on the west coast. DAFF Branch Fisheries document: FISHERIES/2016/NOV/SWG-PEL/66rev: 10pp. (Also MARAM/IWS/DEC16/Sardine/P9) |
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Butterworth, D.S. Comments/queries on ``Starving seabirds: unprofitable foraging...'' by Gremillet et al. DAFF Branch Fisheries document. FISHERIES/2016/FEB/SWG-PEL/04: 4pp. |
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Butterworth, D.S. Draft process for setting initial directed sardine TAC for 2017. DAFF Branch Fisheries document: FISHERIES/2016/NOV/SWG-PEL/68: 2pp. |
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Butterworth, D.S. and Coetzee, J. Potential sources of information to inform on the extent to which sardine spawner biomass on the south coast contributes to recruitment on the west coast. DAFF Branch Fisheries document. FISHERIES/2016/APR/SWG-PEL/17: 1pp. |
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Butterworth, D.S. Clarifying evidence on alternative stock structure hypotheses for sardine. DAFF Branch Fisheries document: FISHERIES/2016/AUG/SWG-PEL/44: 2pp. |
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Butterworth, D.S. A simple biomass-based model for projections of the impacts of further west coast sardine catches on biomass west of Agulhas. DAFF Branch Fisheries document. FISHERIES/2016/AUG/SWG-PEL/36: 2pp. |
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Butterworth, D.S. A draft framework for assigning probabilities to alternative assumptions concerning the contribution of sardine spawning biomass on the south coast to recruitment on the west coast. DAFF Branch Fisheries document. FISHERIES/2016/OCT/SWG-PEL/47rev: 11pp. (Also MARAM/IWS/DEC16/Sardine/P6). |
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Butterworth, D.S. Clarifying hypotheses about sardine stock structure. DAFF Branch Fisheries document. FISHERIES/2016/NOV/SWG-PEL/59: 2pp. |
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Butterworth, D.S. On the use of aggregated vs individual data in assessment models. DAFF Branch Fisheries document: FISHERIES/2016/AUG/SWG-PEL/65: 6pp. (Also MARAM/IWS/DEC16/Peng/Clos/P3) |
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Butterworth, D.S. Questions arising from Weller et al. articles. DAFF Branch Fisheries document. FISHERIES/2016/NOV/SWG-PEL/61: 9pp. (Also MARAM/IWS/DEC16/Peng/Press/P1). |
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Butterworth, D.S. Five key issues with implications for draft WCRL FCPs. DAFF Branch Fisheries document. FISHERIES/2016/APR/SWG-WCRL/06: 3pp. |
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Butterworth, D.S. and Johnston, S.J. Proposal for conversion of intended WCRL recreational TAC into effort and related limitations. DAFF Branch Fisheries document. FISHERIES/2016/AUG/SWG-WCRL/34: 1pp. |
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Butterworth, D.S., Glazer, J.P., Fairweather, T.P. and Durholtz, M.D. An updated assessment of the Agulhas sole resource, Austroglossus pectoralis. DAFF Branch Fisheries document. FISHERIES/2016/SEPT/SWG-DEM/53: 12pp. |
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Butterworth, D.S., van der Lingen, C.D., Coetzee, J. and de Moor, C.L. The present agreed hypothesis for South African sardine stock structure. DAFF Branch Fisheries document: FISHERIES/2016/NOV/SWG-PEL/69: 4pp. (Also MARAM/IWS/DEC16/Sardine/P7) |
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Coetzee, J.C., Butterworth, D.S., van der Lingen, C. and de Moor, C.L. Summary of issues pertinent to a decision on possible adjustment of the maximum directed sardine catch allowance west of Agulhas for 2016. DAFF Branch Fisheries document. FISHERIES/2016/AUG/SWG-PEL/39: 4pp. |
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de Moor, C.L., Coetzee, J., Merkle, D., van der Westhuizen, J.J. and van der Lingen, C. A record of the generation of data used in the 2016 sardine and anchovy assessments. DAFF Branch Fisheries document. FISHERIES/2016/APR/SWG-PEL/13 (revised): 24pp. (Also MARAM/IWS/DEC16/Sardine/BG4) |
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de Moor, C.L. and Butterworth, D.S. Assessment of the South African sardine resource using data from 1984-2015: initial results for a two mixing-stock hypothesis. DAFF Branch Fisheries document. FISHERIES/2016/APR/SWG-PEL/14 (revised): 15pp. |
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de Moor, C.L. and Butterworth, D.S. A risk analysis of the impact of harvesting sardine on the west coast of South Africa. DAFF Branch Fisheries document. FISHERIES/2016/APR/SWG-PEL/21: 7pp. |
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de Moor, C.L. and Butterworth, D.S. Assessment of the South African sardine resource using data from 1984-2015: Results at the joint posterior mode for the two mixing-stock hypothesis. DAFF Branch Fisheries document. FISHERIES/2016/JUL/SWG-PEL/22REV2: 43pp. (Also MARAM/IWS/DEC16/Sardine/P2). |
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de Moor, C.L. and Butterworth, D.S. Assessment of the South African sardine resource using data from 1984-2015: Results at the joint posterior mode for the single stock hypothesis. DAFF Branch Fisheries document. FISHERIES/2016/JUL/SWG-PEL/23REV: 24pp. (Also MARAM/IWS/DEC16/Sardine/BG6). |
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de Moor, C.L., Butterworth, D.S. and Coetzee, J.C. Alternative hypotheses of west to south movement considered for South African sardine. MARAM/IWS/DEC16/Sardine/P12: 8pp. |
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de Moor, C.L. Final anchovy and sardine TACs and TABs for 2016, using OMP-14. DAFF Branch Fisheries document. FISHERIES/2016/APR/SWG-PEL/26: 5pp. |
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de Moor, C.L. Further work on a risk analysis of the impact of harvesting sardine on the west coast of South Africa. DAFF Branch Fisheries document. FISHERIES/2016/AUG/SWG-PEL/33: 3pp. |
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de Moor, C.L. A simple age-based projection model to explore the impact of alternative sardine catches on the west coast of South Africa during 2016. DAFF Branch Fisheries document. FISHERIES/2016/AUG/SWG-PEL/38: 4pp. |
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de Moor, C.L. Draft simulation testing framework to be used during the development of OMP-17. MARAM/IWS/DEC16/Sardine/P14: 26pp. |
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de Moor, C.L., Butterworth, D.S. and Coetzee, J.C. Discussion of OMP-17 simulation projection framework in respect of sardine. DAFF Branch Fisheries document. FISHERIES/2016/SEP/SWG-PEL/43: 12pp. |
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de Moor, C.L. An alternative two mixing stock hypothesis for South African sardine. DAFF Branch Fisheries document. FISHERIES/2016/OCT/SWG-PEL/45: 6pp. (Also MARAM/IWS/DEC16/Sardine/P4). |
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de Moor, C.L. An alternative method to estimate the contribution of south coast spawning to west coast sardine recruitment. MARAM/IWS/DEC16/Sardine/P11: 6pp. |
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de Moor, C.L. Assessment of the South African anchovy resource using data from 1984 – 2015: results at the posterior mode. DAFF Branch Fisheries document. FISHERIES/2016/OCT/SWG-PEL/46: 41pp. (Also MARAM/IWS/DEC16/Sardine/BG7). |
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de Moor, C.L. Excluding survey estimates of recruitment on the South Coast from the two mixing stock hypothesis for South African sardine. DAFF Branch Fisheries document. FISHERIES_2016_NOV_SWG-PEL_55: 7pp. (Also MARAM/IWS/DEC16/Sardine/BG8) |
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de Moor, C.L. Initial simulation projection results assuming a no-catch scenario. MARAM/IWS/DEC16/Sardine/P15: 6pp. |
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de Moor, C.L. Testing robustness of the two mixing stock hypothesis for South African sardine to parasite prevalence data between 20 and 22 degrees. DAFF Branch Fisheries document. FISHERIES/2016/NOV/SWG-PEL/56: 10pp. (Also MARAM/IWS/DEC16/Sardine/BG9). |
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de Moor, C.L. The two mixing stock hypothesis for South African sardine without an assumed stock-recruit relationship. DAFF Branch Fisheries document. FISHERIES/2016/NOV/SWG-PEL/57: 7pp. (Also MARAM/IWS/DEC16/Sardine/P5). |
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de Moor, C.L. and Butterworth, D.S. A proposal for determining the initial desirable maximum catch of directed sardine west of Cape Agulhas during 2017, with suggestions on how this might be achieved. DAFF Branch Fisheries document. FISHERIES/2016/DEC/SWG-PEL/74rev: 11pp. |
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de Moor, C.L. Initial directed sardine and anchovy TACs and TABs for 2017, using OMP-14. DAFF Branch Fisheries document. FISHERIES/2016/DEC/SWG-PEL/80: 5pp. |
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de Moor, C.L. and Butterworth, D.S. Response to the review panel report for the 2015 International Fisheries Stock Assessment Workshop: Sardine. MARAM/IWS/DEC16/Sardine/BG2: 5pp. |
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Fourie, A., Ross-Gillespie, A., Bergh, M. and Butterworth, D.S. A comparison between the hake cannibalism and inter-species predation models in Bergh et al. (2016) and Ross-Gillespie (2016). MARAM/IWS/DEC16/Hake/Pred/P3: 18pp. |
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Glazer, J.P. and Butterworth, D.S. The reduction in effort that would be achieved based on the choice of months selected for fishing in the west coast rock lobster fishery. DAFF Branch Fisheries document. FISHERIES/2016/AUG/SWG-WCRL/35: 2pp. |
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Glazer, J.P. and Butterworth, D.S. A 2016 updated assessment of the squid resource, Loligo reynaudii. DAFF Branch Fisheries document. FISHERIES/2016/OCT/SWG-SQ/25: 19pp. |
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Glazer, J.P. and Butterworth, D.S. Updated calculations related to the additional closed season. DAFF Branch Fisheries document. FISHERIES/2016/OCT/SWG-SQ/26: 1pp. |
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Johnston, S.J. and Butterworth, D.S. Robustness testing of SCRL OMP-2014 and development of a metarule to be used in Exceptional Circumstances. DAFF Branch Fisheries document. FISHERIES/2016/JAN/SWG-SCRL/01: 21pp. |
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Johnston, S.J. and Butterworth, D.S. South coast rock lobster TAC for the 2016/17 season. DAFF Branch Fisheries document. FISHERIES/2016/AUG/SWG-SCRL/05: 3pp. |
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Johnston, S.J. and Butterworth, D.S. Estimates of current levels of poaching of immature versus mature lobsters for West Coast Rock Lobster and how this relates to the overall take. DAFF Branch Fisheries document. FISHERIES/2016/MAR/SWG-WCRL/01: 1pp. |
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Johnston, S.J. and Butterworth, D.S. West Coast rock lobster projections under zero catch and current levels of fishing mortality to investigate how this relates to Fmsy. DAFF Branch fisheries document. FISHERIES/2016/MAR/SWG-WCRL/02: 4pp. |
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Johnston, S.J. and Butterworth, D.S. Updated resource indices for each super-area compared with the threshold levels below which Exceptional Circumstances are invoked. DAFF Branch Fisheries document. FISHERIES/2016/JUL/SWG-WCRL/19: 7pp. |
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Johnston, S.J. and Butterworth, D.S. Update on analyses of west coast rock lobster recreational telephone survey data to include the 2015 season. DAFF Branch Fisheries document. FISHERIES/2016/MAY/SWG-WCRL/12: 5pp. |
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Johnston, S.J. and Butterworth, D.S. The impact on assessments of and projection for the West Coast rock lobster resource if poaching levels are substantially larger than assumed for the present Reference Case assessment. DAFF Branch Fisheries document. FISHERIES/2016/MAR/SWG-WCRL/03: 23pp. |
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Johnston, S.J., Butterworth, D.S. and van Zyl, D. Comparable west coast rock lobster catch and effort data up to 31 March 2016 for the past five seasons, with implications for exceptional circumstances declarations. DAFF Branch Fisheries document. FISHERIES/2016/MAY/SWG-WCRL/08: 14pp. |
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Johnston, S.J. and Butterworth, D.S. Update on analyses of west coast rock lobster recreational telephone survey data to include the 2015 season. DAFF Branch Fisheries document. FISHERIES/2016/MAY/SWG-WCRL/12: 5pp. |
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Johnston, S.J.and Butterworth, D.S. Initial updated 2016 assessments for west coast rock lobster and some initial constant catch projections. DAFF Branch Fisheries document. FISHERIES/2016/AUG/SWG-WCRL/24: 33pp. |
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Johnston, S.J. and Butterworth, D.S. Further projections for west coast rock lobster. DAFF Branch Fisheries document. FISHERIES/2016/AUG/SWG-WCRL/25: 19pp. |
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Johnston, S.J. WCRL constant catch strategies. DAFF Branch Fisheries document. FISHERIES/2016/AUG/SWG-WCRL/26: 4pp. |
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Johnston, S.J. and Butterworth, D.S. Further projections of the west coast rock lobster resource for a range of future constant catch and poaching scenarios. DAFF Branch Fisheries document. FISHERIES/2016/AUG/WCRL/32: 17pp. |
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Johnston, S.J. and Butterworth, D.S. Desert diamond CPUE series to be used in updating the horse mackerel assessment in 2016. DAFF Branch Fisheries document. FISHERIES/2016/SEP/SWG-DEM/50: 4pp. |
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Johnston, S.J. and Butterworth, D.S. The 2016 horse mackerel assessment model. DAFF Branch Fisheries document. FISHERIES/2016/SEP/SWG-DEM/51: 19pp. |
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Johnston, S.J. and Butterworth, D.S. The 2016 horse mackerel updated assessment. DAFF Branch Fisheries document. FISHERIES/2016/SEP/SWG-DEM/52: 7pp. |
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Johnston, S.J. and Butterworth, D.S. TAC for the midwater fleet for 2017 based on the current OMP. DAFF Branch Fisheries document. FISHERIES/2016/OCT/SWG-DEM/66: 1pp. |
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Johnston, S.J. and Butterworth, D.S. 2016 horse mackerel projections. DAFF Branch Fisheries document. FISHERIES/2016/OCT/SWG-DEM/67: 9pp. |
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Johnston, S.J. and Butterworth, D.S. Horse mackerel assessment sensitivity to include dual-rights vessels’ nominal CPUE. DAFF Branch Fisheries document. FISHERIES/2016/OCT/SWG-DEM/68: 4pp. |
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Rademeyer, R.A. and Butterworth, D.S. An initial update of the Reference Case assessment and related projections for the South African hake resource. DAFF Branch Fisheries document. FISHERIES/2016/MAY/SWG-DEM/11: 40pp. |
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Rademeyer, R.A. and Butterworth, D.S. An initial investigation into the increase in the fishing mortality species ratio (Fparadoxus/Fcapensis) in recent hake assessments. DAFF Branch Fisheries document. FISHERIES/2016/JUL/SWG-DEM/24: 7pp. |
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Rademeyer, R.A. and Butterworth, D.S. A further update of the reference case assessment and related projections for the South African hake resource. DAFF Branch Fisheries document. FISHERIES/2016/SEP/SWG-DEM/56: 32pp. |
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Rademeyer, R.A. and Butterworth, D.S. Building a bridge between the May and the September reference cases for the South African resource and related matters. DAFF Branch Fisheries document. FISHERIES/2016/SEPT/SWG-DEM/75: 12pp. |
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Rademeyer, R.A. and Butterworth, D.S. Corrected Reference Case for the South African hake resource. DAFF Branch Fisheries document: FISHERIES/2016/NOV/SWG-DEM/83: 12pp. |
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Rademeyer, R.A. and Butterworth, D.S. Reference Set results and projections under the current OMP for the South African hake resource. DAFF Branch Fisheries document: FISHERIES/2016/NOV/SWG-DEM/84: 25pp. (Also MARAM/IWS/DEC16/Hake/Asses/P1) |
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Rademeyer, R. and Butterworth, D.S. Further projections under the Reference Set for the South African hake resource. MARAM/IWS/DEC/HAKE/ASSES/P2: 8pp. |
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Ross-Gillespie, A. and Butterworth, D.S. Hake cannibalism and inter-species predation model: A summary of the PhD thesis and the development of the model since IWS 2015. MARAM/IWS/DEC16/Hake/Pred/P2: 26pp. |
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Ross-Gillespie, A. and Butterworth, D.S. Implementation of the algorithm recommended by the panel for the 2016 International Stock Assessment Workshop for assessing whether or not to continue with the penguin island closure experiment. DAFF Branch Fisheries document: FISHERIES/2016/DEC/SWG-PEL/77rev: 10pp. |
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Ross-Gillespie, A. and Butterworth, D.S. Penguin power analyses using the approach recommended by the international panel: methods and the complete set of results. MARAM/IWS/DEC16/PENG CLOS/P1a-rev: 30pp. |
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Ross-Gillespie, A. and Butterworth, D.S. Addendum to MARAM/IWS/DEC/PENG Clos/P1a-rev. MARAM/IWS/DEC16/PENG CLOS/P1a-rev: 9pp. |
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Ross-Gillespie, A. and Butterworth, D.S. Some key results from the hake predation model. DAFF Branch Fisheries document. FISHERIES/2016/MAR/SWG-DEM/05: 3pp. |
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Ross-Gillespie, A. and Butterworth, D.S. The hake predation model: future developments and research. MARAM/IWS/DEC16/Hake/Pred/P4: 2pp. |
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Ross-Gillespie, A. A comparison between the hake cannibalism and inter-species predation models presented in Bergh et al. (2016) and Ross-Gillespie (2016). DAFF Branch Fisheries document. FISHERIES/2016/MAR/SWG-DEM/08: 2pp. |
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Ross-Gillespie, A. and Butterworth, D.S. An initial investigation of the information content of sole catch-at-length distributions regarding recruitment trends. DAFF Branch Fisheries document. FISHERIES/2016/SEP/SWG-DEM/55: 6pp. |
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Vrancken, C. and Butterworth, D.S. Regarding the precision of an estimate of the amount of rock lobster poaching obtainable using the Amahlo approach. DAFF Branch Fisheries document. FISHERIES/2016/MAR/SWG-WCRL/05: 3pp. |
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Vrancken, C. and Butterworth, D.S. Some insights into sustainable yield rates. FISHERIES/2016/NOV/SWG-PEL/64(rev): 10pp. (Also MARAM/IWS/DEC16/Sardine/P13) |
Theses
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Ross-Gillespie, A. Modelling cannibalism and inter-species predation for Cape hake species Merluccius capensis and M. paradoxus. PhD thesis. University of Cape Town. 195pp. |
Book Chapters
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de Moor, C.L. and Butterworth, D.S. 2016. Chapter 11: Incorporating technological interactions in a joint Management Procedure for South African sardine and anchovy. In: Management Science in Fisheries – An introduction to simulation-based methods, Eds. C.T.T. Edwards, D.J. Dankel, (Routledge, Abingdon, UK; New York, USA): 205-231. ISBN 978-1-138-80680. |
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Hillary, R.M., Preece, A., Davies, C.R., Kurota, H., Sakai, O., Itoh, T., Parma, A., Butterworth, D.S., Ianelli, T.A. and Branch, T.A. 2014. Chapter 8: Managing international tuna stocks via the Management procedure approach: the southern Bluefin tuna example. In: Management Science in Fisheries – An introduction to simulation-based methods, Eds. C.T.T. Edwards, D.J. Dankel, (Routledge, Abingdon, UK; New York, USA): 147-162. ISBN 978-1-138-80680. |