Research Papers and Refereed Articles
Butterworth, D.S., Plagányi, É.E., Robinson, W.M.L, Moosa, N and de Moor, C.L. Penguin modelling approach queried. Ecological Modelling 316: 78-80
de Moor CL, and Butterworth DS. Assessing the South African sardine resource: two stocks rather than one? African Journal of Marine Science. 37(1): 41-51
de Moor, C.L., Johnston, S.J., Brandao, A., Rademeyer, R.A., Glazer, J.P., Furman, L.B. and Butterworth, D.S. A review of the assessments of the major fisheries resources in South Africa. African Journal of Marine Science, 37(3): 285-311
Deroba, J.J., Butterworth, D.S., Methot, R.D. Jr., De Oliveira, J., Fernandez, C., Nielsen, A., Cadrin, S.X., Dickey-Collas, M., Legault, C.M., Ianelli, J., Valero, J.L., Needle, C., O'Malley, J.M., Chang, Y-J., Thompson, G.G., Canales, C., Swain, D.P., Miller, D.C.M., Hintzen, N.T., Bertignac, M., Ibaibarriaga, L., Silva, A., Murta, A., Kell, L., de Moor, C.L., Parma, A., Dichmont, C.M., Restrepo, V., Ye, Y., Jardim, E., Blaylock, J., Mood, M. Simulation testing the robustness of stock assessment models to error: some results from the ICES Strategic Initiative on Stock Assessment Methods. ICES Journal of Marine Science, 72(1): 19-30.
Geromont, H.F. and Butterworth, D.S. Generic management procedures for data-poor fisheries: forecasting with few data. ICES Journal of Marine Science, 72(1): 251-261
Geromont, H.F. and Butterworth, D.S. Complex assessments or simple management procedures for efficient fisheries management: a comparative study. ICES Journal of Marine Science, 72(1): 262-274
Hanchet, S., Sainsbury, K., Butterworth, D.S., Darby, C., Bizikov, V., Rune Godo, O., Ichii, T., Kock, K-H., Lopez Abellan, L. and Vacchi, M. 2014 CCAMLR's precautionary approach to management of Ross Sea toothfish fishery. Antarctic Science, 27(4): 333-340
Robinson, W., Butterworth, D.S. and Plagányi, É.E. Quantifying the projected impact of the South African sardine fishery on the Robben Island penguin colony. ICES Journal of Marine Science, 72(6): 1822-1833.
Advanced Access
Carruthers, T. R., Kell, L. T., Butterworth, D. 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, doi: 10.1093/icesjms/fsv212
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. 2012. Fish and Fisheries. 14pp. doi: 10.1111/faf.12121
Punt, A., Butterworth, D.S., de Moor, C.L., De Oliveira, J. and Haddon, M. Management Strategy Evaluation: Best Practices. 2014. Fish and Fisheries - Manuscript ID FaF-14-Jun-OA-111.R2 [email ref: SE-8-a] doi: 10.1111/faf.12104
Chapter in Book
Durholtz, M.D., Singh, L., Fairweather, T.P., Leslie, R.W., van der Lingen, C.D., Bross, C.A.R., Hutchings, L., Rademeyer, R.A., Butterworth, D.S. and Payne, A.I.L. Chapter 2: fisheries, ecology and markets of South African hake. In: Fish and Aquatic Resources Series 17: Hakes Biology and Exploitation (Ed. Hugo Arancibia), Wiley Blackwell (2015) 38-69. ISBN 9781118568415.
Non-Peer reviewed published Conference Proceedings
Butterworth, D.S. An approximate adjustment to the 2006 sightings abundance estimate for bowhead whales to allow for Time-in-View (tiv). Annex E of Report of the AWMP Intersessional Workshop on developing SLAs for the Greenland hunts. Journal of Cetacean Resource Management. 16(Suppl): 451.
Butterworth, D.S. and Rademeyer, R.A. An updated statistical catch-at-length assessment for Eastern Atlantic bluefin tuna: SCRS/2014/169: Collect. Vol. Sci. Pap. ICCAT, 71(4): 1639-1659.
Butterworth, D.S. and Rademeyer, R.A. An updated statistical catch-at-length assessment for Western Atlantic Bluefin tuna: SCRS/2014/188: Collect. Vol. Sci. Pap. ICCAT, 71(4): 1813-1831.
Butterworth, D.S. and Rademeyer, R.A. Updates on the SCAL assessments of eastern and western Atlantic bluefin tuna: SCRS/2014/195: Collect. Vol. Sci. Pap. ICCAT, 71(4): 1854-1862.
Ross-Gillespie, A., Butterworth, D.S. and Findlay, K. Final results for the final `base case' three-stock BSD, BSE1 and BSO model, with sensitivity runs. Appendix 3 of Report of the Sub-Committee on the Other Southern Hemisphere Whale Stocks. Journal of Cetacean Resource Management. 16(Suppl): 215-221.
Unpublished Research/Technical/Policy Documents
Brandao, A. and Butterworth, D.S. Further potential SLAs for West Greenland bowhead whales testing against the agreed evaluation trials. International Whaling Commission document: SC/F15/AWMP/03: 8pp.
Brandao, A. and Butterworth, D.S. Potential SLAs for West Greenland fin whales testing against the agreed evaluation trials. International Whaling Commission document: SC/66a/AWMP/04: 7pp.
Brandão, A. and Butterworth, D.S. Further potential SLAs for West Greenland fin whales testing against the agreed evaluation trials. International Whaling Commission document: SC/D15/AWMP/GEN: 8pp.
Ross-Gillespie, A. and Butterworth, D.S. Simulation exercise to ascertain the relative utility of collection of various data types for informing future Southern Hemisphere humpback whale assessments and Breeding Stocks D, E1 and the Oceania stocks. International Whaling Commission Document: SC/66a/SH/04: 9pp.
Ross-Gillespie, A. and Butterworth, D.S. Implementing the 2014 three-stock model for Southern Hemisphere Breeding Stocks E1, Oceania and G. International Whaling Commission Document: SC/66a/SH/05: 17pp.
PowerPoint Presentations
Butterworth, D.S. MSE: (Management Strategy Evaluation) What, Why and When. Presentation to ISC Workshop on MSE, Yokohama, 16-17 April, 2015.
Butterworth, D.S. What is a Management Procedure (MP), Management Strategy Evaluation (MSE) and Why is it Important? - Presentation to the Indian Ocean Tuna Commission 2nd Management Procedures Dialogue, Busan, Korea, 26 April, 2015.
Butterworth, D.S. and Geromont, H.F KISS: The Key Principle for managing Data-limited Fisheries? Keynote presentation to the 30th Lowell Wakefield Fisheries Symposium, May 12-15, 2015, Anchorage, Alaska.
Butterworth, D.S. Fisheries modelling and management or What have I learned from 400+ international scientific fisheries meetings? Presentation on Fisheries Modeling and Management, University of Alaska Anchorage Campus Bookstore Series, May 13, 2015.
2015 Alaskan Series For recordings of the presentations of the Anchorage, Alaska Series, refer to no. 33 - 35 of the following site
Butterworth, D.S. The sustainability of the SA fishing industry. Presentation to the EMBA Symposium: Thoughts on the sustainability of the South African Fishing Industry, UCT Graduate School of Business, 9 June, 2015.
Butterworth, D.S. Fisheries Management - What's Coming Next? - Presentation to the Groundfish Forum XXIV, Cape Town, 14-15 October, 2015. 19pp.
de Moor, C.L. Recruitment variability in simulation projections. Presentation to the Small Pelagic Scientific Working Group, Cape Town, 25 February 2015. 9pp.
de Moor, C.L. Assessing the South African sardine resource: two stocks rather than one? Presentation to the SANCOR seminar, Oceanography department, University of Cape Town, 9 July, 2015. 38pp.
de Moor, C.L. Assessment of the South African anchovy resource using data from 1984-2014: base case results at the posterior mode. Presentation to the Small Pelagic Scientific Working Group, Cape Town, 19 August, 2015. 23pp.
Geromont, H.F. Are data-poor fisheries certifiable? Generic Management Procedures and precautionary management. MSC workshop, 6-7 August, 2015, Hobart, Australia. 34pp.
Plagányi, E., Skewes, T., Hobday, A., Blamey, L. and Robinson, W. Modelling ecological tipping points and road-testing management strategies for increasing marine ecosystem resilience. Presentation to the 3rd International Symposium on the Effects of Climate Change on the World's Oceans, Santos, Brazil, 25 March, 2015. 28pp.
Rademeyer, R.A. and Butterworth, D.S. An Illustrative Example of a Management Procedure for Eastern North Atlantic Bluefin Tuna. Presentation to ICCAT Bluefin Species Group Meeting, Madrid, 23-25 September, 2015. 19pp.
Canadian Redfish
Rademeyer, R.A. and Butterworth, D.S. Statistical catch-at-length assessment results for Sebastes mentella and S. fasciatus in Units 1 and 2. CSAM Working Paper 2015/13: 36pp.
Rademeyer, R.A. and Butterworth, D.S. Constant F projections under single species assessments of Sebastes mentella and S. fasciatus in Units 1 and 2. CSAM Working Paper 2015/xx: 2pp.
Southern Bluefin Tuna
Takahashi, N., Kurota, H., Saki, O., Itoh, T. and Butterworth, D.S. A check of operating model predictions with discussion of aerial survey index issues related to continuing use of the Bali Management procedure. Southern Bluefin tuna document: CCSBT-ESC/1509/37: 8pp.
Takahashi, N., Kurota, H., Saki, O., Itoh, T. and Butterworth, D.S. Some initial considerations for the review of the Bali Management Procedure in 2017. Southern Bluefin tuna document: CCSBT-ESC/1509/38: 12pp.
New Zealand Abalone
Butterworth, D.S., Haddon, M., Haist, V. and Helidoniotis, F. Review of New Zealand paua stock assessment models, March 2015. 33pp.
FAO
Geromont, H.F. and D.S. Butterworth. A review of assessment methods and the development of management procedures for data-poor fisheries. Report to FAO: 213pp.
Tristan
Johnston, S.J. and Butterworth, D.S. Updated 2015 Tristan da Cunha rock lobster assessment. MARAM document: MARAM/TRISTAN/2015/FEB/01: 10pp.
Johnston, S.J. Preliminary Tristan Group Biomass Survey Leg1 results including data from the 2014 season. MARAM document: MARAM/TRISTAN/2015/MAR/02: 18pp.
Johnston, S.J. and Butterworth, D.S. Initial Tristan island exceptional circumstances rule development. MARAM document: MARAM/TRISTAN/2015/MAR/03: 15pp.
Johnston, S.J. Final Tristan Group Biomass Survey Leg1 results including data from the 2014 season. MARAM document: MARAM/TRISTAN/2015/MAY/04: 18pp.
Johnston, S.J. and Butterworth, D.S. Updated observer catch-at-length data from the commercial fisheries at the Tristan da Cunha group of islands. MARAM document: MARAM/TRISTAN/2015/MAY/05: 11pp.
Johnston, S.J., Brandao, A. and Butterworth, D.S. Updated 2015 GLMM- and GLM-standardised lobster CPUE from the Tristan da Cunha group of islands. MARAM document: MARAM/TRISTAN/2015/MAY/06: 16pp.
Johnston, S.J. and Butterworth, D.S. Updated 2015 Nightingale island rock lobster assessment. MARAM document: MARAM/TRISTAN/2015/MAY/07: 25pp.
Butterworth, D.S. and Johnston, S.J. Recommendations on rock lobster TACs for the Tristan group of islands for the 2015/16 season. MARAM document: MARAM/TRISTAN/2015/JUN/08: 22pp.
Butterworth, D.S. and Johnston, S.J. Could the Tristan powerboat CPUE decline have been caused by overfishing? MARAM document: MARAM/TRISTAN/2015/JUN/09: 4pp.
Johnston, S.J. and Butterworth, D.S. Further Updated 2015 Reference Case Tristan da Cunha rock lobster assessment. MARAM document: MARAM/Tristan/2015/SEP/10: 8pp.
Johnston, S.J. Preliminary Tristan Group Biomass Survey Leg1 results including data from the 2015 season. MARAM document: MARAM/TRISTAN/2015/OCT/11: 6pp.
Johnston, S.J. and Butterworth, D.S. Initial Results in the Development of a Revised OMP for Tristan da Cunha island rock lobster. MARAM document: MARAM/TRISTAN/2015/OCT/12: 11pp.
Johnston, S.J. and Butterworth, D.S. Tristan powerboat CPUE efficiency. MARAM document: MARAM/TRISTAN/2015/OCT/13: 4pp.
Consultancy and Other Activities Based on Expertise Developed in Research
Bergh, M.O., Butterworth, D.S., Cochrane, K.L., Morris, T.L., Sherley, R.B., Ross-Gillespie, A. and Winker, H. Specifications for operating models to evaluate bias in estimation methods in accordance with recommendation A.1 of the 2014 International Review Panel. International Stock Assessment Review Workshop document. MARAM/IWS/DEC15/PengD/P1: 10pp.
Bergh, M.O., Butterworth, D.S., Cochrane, K.L., Morris, T.L., Sherley, R.B., Ross-Gillespie, A. and Winker, H. Consolidated analyses produced in implementation of the approaches described in document. MARAM/IWS/DEC15/PengD/P1. International Stock Assessment Review Workshop document: MARAM/IWS/DEC15/PengD/P2: 40pp.
Bergh, M.O., Butterworth, D.S., Cochrane, K.L., Morris, T.L., Sherley, R.B., Ross-Gillespie, A. and Winker, H. Penguin power analysis methodology – Draft. International Stock Assessment Review Workshop document. MARAM/IWS/DEC15/PengD/P3: 4pp.
Bergh, M.O., Butterworth, D.S., Cochrane, K.L., Morris, T.L., Sherley, R.B., Ross-Gillespie, A. and Winker, H. Simulation testing of penguin closure effect response estimators – where next? International Stock Assessment Review Workshop document. MARAM/IWS/DEC15/PengD/P4: 6 pp.
Bergh, M.O., Butterworth, D.S., Cochrane, K.L., Morris, T.L., Sherley, R.B., Ross-Gillespie, A. and Winker, H. Chair's overview of progress in the simulation testing of penguin closure effect response estimators as reported in MARAM/IWS/DEC15/PengD/P1-4: 6 pp.
Brandao, A. and Butterworth, D.S. Initial results of an age-structured assessment model for Zone F. DAFF Branch Fisheries document: FISHERIES/2015/MAY/TSKGRP-AB/02: 10pp.
Brandao, A. and Butterworth, D.S. Updated analyses of the Fisheries Independent Monitoring Survey data of the Rock Lobster resource of South Africa to include the 2014/15 season. DAFF Branch Fisheries document: FISHERIES/2015/JUN/SWG-WCRL/16: 19pp.
Brandao, A. and Butterworth, D.S. Updated GLMM standardisation of the commercial abalone CPUE for Zones A-D over the period 1980-2014. DAFF Branch Fisheries document: FISHERIES/2015/AUG/SWG-AB/02: 9pp.
Brandao, A. and Butterworth, D.S. Updated GLMM standardisation of the commercial abalone CPUE for Zone F. DAFF Branch Fisheries document: FISHERIES/2015/AUG/SWG-AB/06: 7pp.
Brandao, A. and Butterworth, D.S. Proposed Operating Models to test decision rules for Zone F. DAFF Branch Fisheries document: FISHERIES/2015/AUG/SWG-AB/07: 16pp.
Brandao, A. and Butterworth, D.S. Updated trends in policing effort and the number of confiscations for abalone including compliance data until March 2015. DAFF Branch Fisheries document: FISHERIES/2015/AUG/SWG-AB/08: 9pp.
Brandao, A. and Butterworth, D.S. Projections of abalone abundance for Zone F. DAFF Branch Fisheries document: FISHERIES/2015/AUG/SWG-AB/14: 6pp.
Brandao, A. and Butterworth, D.S. Abalone spatial- and age-structured assessment model and projections for Zones A, B, C and D. DAFF Branch Fisheries document: FISHERIES/2015/AUG/SWG-AB/15: 23pp.
Brandao, A. and Butterworth, D.S. Spanish longline and trotline standardised CPUE series for toothfish (Dissostichus eleginoides) in the Prince Edward Islands EEZ to be used as input for assessment. DAFF Branch Fisheries document: FISHERIES/2015/OCT/SWG-DEM/38: 10pp.
Brandao, A. and Butterworth, D.S. Updated assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2015, including tag-recapture data. DAFF Branch Fisheries document: FISHERIES/2015/OCT/SWG-DEM/40: 34pp.
Butterworth, D.S. and Bergh, M.O. Progress on checking assessments and projections for west coast rock lobster. DAFF Branch Fisheries document: FISHERIES/2015/FEB/SWG-WCRL/06: 1pp.
Butterworth, D.S. and Johnston, S.J. On the range of implications of flexibility/constraining future inter-annual TAC variations on the risk of failing to recover the west coast rock lobster resource. DAFF Branch Fisheries document: FISHERIES/2015/FEB/SWG-WCRL/08: 5pp.
Butterworth, D.S. and Johnston, S.J. Some aspects of the development of a new OMP for the West Coast Rock Lobster fishery for recommending TAC allocations for the 2015+ seasons. DAFF Branch Fisheries document: FISHERIES/2015/MAR/SWG-WCRL/10: 7pp.
Butterworth, D.S. and de Moor, C.L. A Response to Proposed Additional Ecosystem Considerations for Exceptional Circumstances Relating to the Sardine-Anchovy OMP-14. DAFF Branch Fisheries document: FISHERIES/2015/APR/SWG-PEL/13: 4pp.
Butterworth, D.S. On plans for penguin analyses arising from some of the IWC Panel: Recommendations. DAFF Branch Fisheries document: FISHERIES/2015/MAY/SWG-PEL/17: 6pp (also MARAM/IWS/DEC15/PengD/BG3)
Butterworth, D.S. and Moosa, N. A note on the extent of autocorrelation of residuals in the GLM analyses of penguin response variables in the feasibility study. DAFF Branch Fisheries document: FISHERIES/2015/MAY/SWG-PEL/18: 8pp (also MARAM/IWS/DEC15/PengD/BG2).
Butterworth, D.S. Some comments on the suggested use of the ``one third for the birds" measure as a pelagic OMP performance statistic threshold. DAFF Branch Fisheries document: FISHERIES/2015/JUL/SWG-PEL/24: 4pp
Butterworth, D.S. Suggestions re further penguin power analysis and estimator simulation tests in response to panel recommendations. DAFF Branch Fisheries document: FISHERIES/2015/AUG/SWG-PEL/PENG/D1: 6pp (also MARAM/IWS/DEC15/PengD/BG4).
Butterworth, D.S. and Coetzee, J. Progress in relation to penguin recommendations by the International Review Panel for the 2014 International Fisheries Stock Assessment Workshop 1-5 December 2014, UCT. International Stock Assessment Review Workshop document. MARAM/IWS/DEC15/PengD/BG5: 10pp.
de Moor, C.L. Recruitment variability in simulation projections. DAFF Branch Fisheries document: FISHERIES/2015/FEB/SWG-PEL/05: 6pp.
de Moor, C.L., Butterworth, D.S., Coetzee, J.C. and van der Lingen, C.D. Extract from the International Review Panel Report from the 2014 International Fisheries Stock Assessment Workshop. DAFF Branch Fisheries document: FISHERIES/2015/FEB/SWG-PEL/07: 6pp.
de Moor, C.L. Further OMP-14 Performance Statistics. DAFF Branch Fisheries document: FISHERIES/2015/MAY/SWG-PEL/15: 9pp.
de Moor, C.L. ``Third for the Birds" for South African Sardine and Anchovy?. DAFF Branch Fisheries document: FISHERIES/2015/JUL/SWG-PEL/21: 4pp.
de Moor, C.L. and Butterworth, D.S. A new length-weight relationship for South African anchovy. DAFF Branch Fisheries document: FISHERIES/2015/JUN/SWG-PEL/26: 49pp.
de Moor, C.L. Final Anchovy and Sardine TACs and TABs for 2015, using OMP-14. DAFF Branch Fisheries document: FISHERIES/2015/JUL/SWG-PEL/29: 5pp.
de Moor, C.L. and Butterworth, D.S. Assessment of the South African anchovy resource using data from 1984-2014: base case results at the posterior mode. DAFF Branch Fisheries document: FISHERIES/2015/AUG/SWG-PEL/31: 36pp.
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 2015 sardine and anchovy assessments. DAFF Branch Fisheries document: FISHERIES/2015/NOV/SWG-PEL/42: 19pp (also MARAM/IWS.DEC15/Sardine/BG3).
de Moor, C.L. and Butterworth, D.S. Some initial results using the revised two mixing-stock hypothesis for South African sardine. DAFF Branch Fisheries document: FISHERIES/2015/NOV/SWG-PEL/43: 17pp.
de Moor, C.L. Initial directed sardine and anchovy TACs and TABs for 2016, using OMP-14. DAFF Branch Fisheries document: FISHERIES_2015_DEC_SWG-PEL_48: 5pp.
de Moor, C.L. and Butterworth, D.S. The stock assessment model for South African sardine. International Stock Assessment Review Workshop document. MARAM/IWS/DEC15/Sardine/P1: 18pp.
de Moor, C.L. and Butterworth, D.S. 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. International Stock Assessment Review Workshop document. MARAM/IWS/DEC15/Sardine/P3: 18pp.
de Moor, C.L., van der Lingen, C.D. and Butterworth, D.S. Overview of sardine documents. International Stock Assessment Review Workshop document: MARAM/IWS/DEC15/Sardine/BG1: 2pp.
de Moor, C.L., Butterworth, D.S., van der Lingen, C.D. and Coetzee, J. Progress report on recommendations from the international review panel report for the 2013 and 2014 International Fisheries Stock Assessment Workshop: sardine two-stock hypothesis. International Stock Assessment Review Workshop document. MARAM/IWS/DEC15/Sardine/BG2: 10pp.
Furman, L.B. The 2014 Operational Management Procedure for the South African horse mackerel resource. DAFF Branch Fisheries document: FISHERIES/2015/MAR/SWG-DEM/03: 10pp.
Johnston, S.J. An outline of two OMP approaches for management of the West Coast rock lobster. DAFF Branch Fisheries document: FISHERIES/2015/JAN/SWG-WCRL/01: 2pp.
Johnston, S.J. Initial updated 2015 assessments for west coast rock lobster. DAFF Branch Fisheries document: FISHERIES/2015/JAN/SWG/WCRL/02: 23pp.
Johnston, S.J. and Butterworth, D.S. A note on comparisons of recent west coast rock lobster assessments, including with OMP-2011 projections. DAFF Branch Fisheries document: FISHERIES/2015/JAN/SWG-WCRL/04: 2pp.
Johnston, S.J. Super-area 7 (Dassen Island): Expected situation regarding exceptional circumstances for the next two seasons. DAFF Branch Fisheries document: FISHERIES/2015/FEB/SWG-WCRL/07: 2pp.
Johnston, S.J. FINAL updated 2015 assessments for west coast rock lobster. DAFF Branch Fisheries document: FISHERIES/2015/MAR/SWG/WCRL/11/REV: 23pp.
Johnston, S.J. and Butterworth, D.S. The development of a new OMP for the West Coast Rock Lobster fishery for recommending TAC allocations for the 2015+ seasons. DAFF Branch Fisheries document: FISHERIES/2015/MAY/SWG-WCRL/13: 22pp.
Johnston, S.J. and Butterworth, D.S. West Coast Rock Lobster OMP 2015: Some initial results. DAFF Branch Fisheries document: FISHERIES/2015/MAY/SWG-WCRL/14: 7pp.
Johnston, S.J. and Butterworth, D.S. Further OMP simulation results for OMP 2015 for west coast rock lobster. DAFF Branch Fisheries document: FISHERIES/2015/JUN/SWG-WCRL/15: 14pp.
Johnston, S.J. and Butterworth, D.S. Final OMP simulation results for OMP 2015 for west coast rock lobster. DAFF Branch Fisheries document: FISHERIES/2015/JUL/SWG-WCRL/24: 8pp.
Johnston, S.J. and Butterworth, D.S. Final OMP 2015 options for west coast rock lobster. DAFF Branch Fisheries document: FISHERIES/2015/AUG/SWG/WCRL/25: 5pp.
Johnston, S.J. and Butterworth, D.S. TAC values for 2015 season for West Coast rock lobster using OMP-2015. DAFF Branch Fisheries document: FISHERIES/2015/AUG/SWG-WCRL/26: 16pp.
Johnston, S.J, Butterworth, D.S., Glazer, J.P. and Brandao, A. OMP 2015 to be used for setting TACs for the West Coast Rock Lobster fishery for the 2015+ seasons. DAFF Branch Fisheries document: Fisheries/2015/AUG/SWG-WCRL/27: 73pp.
Johnston, S.J. and Butterworth, D.S. 2015 updated South Coast Rock Lobster assessment results. DAFF Branch Fisheries document: FISHERIES/2015/JUL/SWG-SCRL/04: 17pp.
Johnston, S.J. and Butterworth, D.S. South Coast Rock Lobster TAC for the 2015/16 season. DAFF Branch Fisheries document: FISHERIES/2015/AUG/SWG-SCRL/06: 7pp.
Johnston, S., Singh, L., Glazer, J. and Butterworth, D.S. The 2016 updated horse mackerel standardized CPUE and implications for Exceptional Circumstances applying when setting of the TAC for 2016. DAFF Branch Fisheries document: FISHERIES/2015/OCT/SWG-DEM/34: 14pp.
Johnston, S.J. and Butterworth, D.S. Horse mackerel 2015 updated assessment. DAFF Branch Fisheries document: FISHERIES/2015/OCT/SWG-DEM/44: 5pp.
Johnston, S.J. and Butterworth, D.S. Horse mackerel projections under various management options and resource scenarios. DAFF Branch Fisheries document: FISHERIES/2015/NOV/SWG-DEM/49: 13pp.
MARAM. Schedules for developing and implementing OMP revisions for major South African fisheries. DAFF Branch Fisheries document: FISHERIES/2015/JUL/SWG-GEN/01: 2pp.
Rademeyer, R.A. and Butterworth, D.S. Estimating the Andromeda catchability compared to the Africana for South African hake in an update of the Reference Case assessment. DAFF Branch Fisheries document: FISHERIES/2015/AUG/SWG-DEM/16: 8pp.
Rademeyer, R.A. and Butterworth, D.S. Modelling selectivity as a random walk process for the offshore trawl fleet for M. paradoxus. DAFF Branch Fisheries document: FISHERIES/2015/AUG/SWG-DEM/18: 6pp.
Rademeyer, R.A. Output from the South African hake OMP-2014 for the 2016 TAC recommendation. DAFF Branch Fisheries document: FISHERIES/2015/OCT/SWG-DEM/36: 4pp.
Ross-Gillespie, A. Brief update on progress of the hake cannibalism/predation model. DAFF Branch Fisheries document: FISHERIES/2015/MAR/SWG-DEM/02: 1pp.
Ross-Gillespie, A. and Butterworth, D.S. Impact of sampling strategy on estimates of hake survey length distributions and the proportions of hake in the hake diet: a summary of work to date. DAFF Branch Fishery document: FISHERIES/2015/AUG/SWG-DEM/17: 2pp.
Ross-Gillespie, A. and Butterworth, D.S. Modelling cannibalism and inter-species predation for Cape hake Merluccius capensis and M. paradoxus: Model specifications and preliminary results. International Stock Assessment Review Workshop document. MARAM/IWS/DEC15/Hake/P1: 26pp.
Ross-Gillespie, A., Butterworth, D.S., Fairweather, T.P. and Rademeyer, R.A. Investigating different methods for obtaining hake survey probability distributions for length, and an inspection the sub-sample for which biologicals were measured. International Stock Assessment Review Workshop document. MARAM/IWS/DEC15/Hake/BG1: 26pp
Ross-Gillespie, A. Report on progress made on the hake cannibalism and inter-species predation model. International Stock Assessment Review Workshop document. MARAM/IWS/DEC15/Hake/BG3: 6pp.
Van Zyl, D. and Johnston, S.J. An estimate of poaching in Area 5 using comparative catches between days of no compliance operations and when a patrol vessel was present. DAFF Branch Fisheries document: FISHERIES/2015/MAR/SWG-WCRL/09: 3pp.
