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Research Output

2011

Research Papers and Refereed Articles

Branch TA. Humpback whale abundance south of 60°S from three complete circumpolar sets of surveys. Journal of Cetacean Research and Management (Special Issue) 3: 53–69.
Brandão A and Butterworth DS. Concerning demographic limitations on the population growth rate of West Australian (breeding stock D) humpback whales. Journal of Cetacean Research and Management (Special Issue) 3: 201–208.
de Moor CL, Butterworth DS, and De Oliveira JAA. Is the management procedure approach equipped to handle short-lived pelagic species with their boom and bust dynamics? The case of the South African fishery for sardine and anchovy. ICES Journal of Marine Science 68(10): 2075–2085.
Johnston SJ, Zerbini AN, and Butterworth DS. A Bayesian approach to assess the status of Southern Hemisphere humpback whales (Megaptera novaengliae) with an application to breeding stock G. Journal of Cetacean Research and Management (Special Issue) 3: 309–317.
Plagányi ÉE, Butterworth DS, and Burgener M. Illegal and unreported fishing on abalone—Quantifying the extent using a fully integrated assessment model. Fisheries Research 107: 221–232.
Plagányi ÉE, Weeks SJ, Skewes TD, Gibbs MT, Poloczanska ES, Norman-López A, Blamey LK, Soares M, and Robinson WML. Assessing the adequacy of current fisheries management under changing climate: a southern synopsis. ICES Journal of Marine Science 68: 1305–1317.
Rademeyer RA and Butterworth DS. Technical details underlying the Management Strategy Evaluation process leading to selection of a Management Procedure for Western Component (4Xopqrs5) pollock. DFO Can. Sci. Advis. Sec. Res. Doc. 2011/090: vi+32 pp.
Raemaekers S, Hauck M, Burgener M, Mackenzie A, Maharaj G, Plagányi, ÉE, and Britz PJ. Review of the causes of the rise of the illegal South African abalone fishery and consequent closure of the rights-based fishery. Ocean & Coastal Management 54: 433–445.

Unpublished Research/Technical/Policy Documents

Brandão A and Butterworth DS. A proposed model transformation to circumvent problems encountered with the sex-ratio approach to obtain lower confidence limits for the abundance of West Greenland minke whales. International Whaling Commission document: SC/63/AWMP5: 1–16.
Brandão A, Best PB, and Butterworth DS. Monitoring the recovery of the southern right whale in South African waters. International Whaling Commission document: SC/S11/RW18: 1–18.
Butterworth DS, Brandão A, Müller A, and Best PB. Preliminary results for a photo-identification-based assessment of southern right whales in South African waters. International Whaling Commission document: SC/S11/RW29: 1–7.
  de Moor CL. Calculation of stock mixing proportions, including correction for "missing alleles": Unpooled results. International Whaling Commission document: SC/D11/NPM4rev: 1–52.
Müller A, Butterworth DS, and Johnston SJ. Assessments of the southern hemisphere humpback whale breeding stock B: Results for the models and sensitivities proposed at and following the 62nd meeting of the Scientific Committee of the IWC. International Whaling Commission document: SC/63/SH26: 1–45.
Sakai O, Kurota H, Takahashi N, and Butterworth DS. Conditioning of the SBT operating model to inform projection specifications. CCSBT Document: CCSBT-ESC/1107/33: 1–13.
Kurota H, Takahashi N, Sakai O, and Butterworth DS. Performance of the empirical management procedure (MP2) under the updated operating models. CCSBT Document: CCSBT-ESC/1107/34: 1–13.
  Geromont HF and Butterworth DS. An initial comparison of the performances of simple management procedures compared to complex assessments for some ICES stocks. ICES Working Group on Methods of Fish Stock Assessment (WGMG) Report 2011. Annex 5, 148–220.

Presentations

Available from authors on request

  Butterworth DS and de Moor CL. Updating OMP-08: Progressing towards OMP-12. Presentation to SAPFIA, 8 February 2011.
  Butterworth DS and Brandão A. The estimation of poaching levels and trends in the abalone and west coast rock lobster fisheries. DAFF Information Session on Abalone Assessment, 11 July 2011.
  Butterworth DS. Management procedures — the basis used to regulate the major South African fisheries. Presentation to Graduate School of Business MBAs, 13 July 2011.
  Butterworth DS and Johnston SJ. West Coast rock lobster recovery targets and sector splits. DAFF Management meeting 19 August 2011.
  Butterworth DS and Geromont HF. Comparison of the performance of simple management procedures (MPs) compared to complex assessments — Plaice and Sole (Subarea IV). Presentation to ICES Methods Working Group, Vigo, Spain, 14 October 2011.
  Johnston SJ. Scientific data used in the current management of West Coast rock lobster. Presentation to Workshop on rock lobster co-management and data centralisation, 24 November 2011.
  de Moor CL and Butterworth DS. An overview of the management of SA sardine and anchovy fisheries. MARAM International Stock Assessment Workshop, 28 November 2011: 1–31.

Atlantic Menhaden

Butterworth DS and Rademeyer RA. An initial investigation of an approach to develop a survey-based rule to judge whether abundance has dropped below an appropriate "limit reference point" for Atlantic menhaden. Document submitted to ASMFC Atlantic Menhaden Technical Committee Meeting, St. Petersburg, Florida, January 2011: 1–22.

Canadian Pollock

Rademeyer RA and Butterworth DS. A Proposed Set of Operating Models for Canadian Pollock in the Western Component (4Xopqrs+5Zc) to be used in Management Procedure Testing (or MSE). In Porter, J.M., and Docherty, V., Chairpersons. Proceedings of 4X5 Pollock Management Strategy Evaluation Workshop – 2010. Can. Manuscr. Rep. Fish. Aquat. Sci. 2945: 97–114.
Rademeyer RA and Butterworth DS. Progress on the Development of Candidate Management Procedures for the Canadian Pollock in the Western Component (4Xopqrs+5Zc). In Porter, J.M., and Docherty, V., Chairpersons. Proceedings of 4X5 Pollock Management Strategy Evaluation Workshop – 2010. Can. Manuscr. Rep. Fish. Aquat. Sci. 2945: 115–134.
Rademeyer RA and Butterworth DS. Further progress on the development of candidate management procedures for the Canadian Pollock in the Western component (4Xopqrs+5Zc). Document submitted to the Canadian Pollock MSE development process, February 2011: 1–22.
Rademeyer RA and Butterworth DS. Report on ongoing progress in the development of candidate management procedures for the Canadian Pollock in the western component (4Xopqrs+5Zc). Document submitted to the Canadian Pollock MSE development process, April 2011: 1–15.
Rademeyer RA and Butterworth DS. Results on the development of candidate management procedures for the Canadian Pollock in the western component (4Xopqrs+5Zc) for the May 2011 meeting. CSA Working paper 2011/22: 1–33.
Rademeyer RA and Butterworth DS. Addendum to: Results on the development of candidate management procedures for the Canadian Pollock in the western component (4Xopqrs+5Zc) for the May 2011 meeting. CSA Working paper 2011/23: 1–19.

Greenland Halibut

Butterworth DS and Rademeyer RA. On "Exceptional Circumstances" provisions for the management strategy for the Greenland halibut stock in Subarea 2 + divisions 3KLMNO based on survey results occurring outside the range simulated. FCWG-MSE Working paper 11/4: 1–5.

Hawaiian False Killer Whales

Butterworth DS. Some comments on the calculation of extinction risk for Hawaiian insular false killer whale sin NOAA Technical Memorandum NMFS-PIFSC-22. Feb 2011: 1–3.

Gulf of Maine Cod

Butterworth DS and Rademeyer RA. Applications of statistical catch-at-age assessment methodology to Gulf of Maine cod. Document submitted to NMFS SAW/SARC-53 Model/Reference Point Meeting for the benchmark assessment of Gulf of Maine cod, October 2011: 1–31.
Butterworth DS and Rademeyer RA. Progress in investigating differences amongst SCAA and ASAP assessment (including reference point) estimates for Gulf of Maine cod. Document submitted to New England fishery industry associations, November 2011: 1–20. (Updated version available)

New England Flounder

Rademeyer RA and Butterworth DS. Initial applications of statistical catch-at-age assessment methodology to the Gulf of Maine winter flounder resource. Document submitted to NMFS SARC-52 Winter Flounder Assessments Final Meeting, April 2011: 1–28.
Rademeyer RA and Butterworth DS. Initial applications of statistical catch-at-age assessment methodology to the Southern New England/Mid-Atlantic winter flounder resource. Document submitted to NMFS SARC-52 Winter Flounder Assessments Final Meeting, April 2011: 1–29.
Rademeyer RA and Butterworth DS. Update of the Southern New England/Mid-Atlantic winter flounder resource new base case SCAA using updated data. Document submitted to NMFS SARC-52 Winter Flounder Assessments Final Meeting, April 2011: 1–9.

Canadian Redfish

Rademeyer RA and Butterworth DS. Initial applications of statistical catch-at-age assessment methodology to Atlantic redfish. Document submitted to Canadian ZAP meeting related to Precautionary Approach reference points for Atlantic redfish populations, Mont-Joli, October 2011: 34 pp.

Miscellaneous

Butterworth DS, Brandão A, de Moor CL, and Robinson W. Claim by Pichegru et al. that marine no-take zone benefits penguins remains premature.
Butterworth DS, Brandão A, de Moor CL, and Robinson W. The claim by Pichegru et al. that marine no-take zone benefits penguins remains premature. In SANCOR newsletter, No 195, July 2011, ISSN 03700-9026: 10–12.

Consultancy and Other Activities Based on Expertise Developed in Research

Brandão A and Butterworth DS. Report back on updates to the assessment model for Zones A to D. DAFF Branch Fisheries document: FISHERIES/2011/FEB/SWG-AB/01: 1–3.
Brandão A and Butterworth DS. Trends in policing effort and the number of confiscations for abalone. DAFF Branch Fisheries document: FISHERIES/2011/AUG/SWG-AB/08: 1–13.
Brandão A and Butterworth DS. Results for the abalone spatial- and age-structured assessment model for Zones A, B, C and D in 2011. DAFF Branch Fisheries document: FISHERIES/2011/AUG/SWG-AB/11: 1–13.
Brandão A and Butterworth DS. Standardised commercial abalone CPUE for Zones A-D over the period 1980–2010. FISHERIES/2011/AUG/SWG-AB/13: 1–10.
Brandão A, Johnston SJ, and Butterworth DS. Trends in policing effort and the number of confiscations for West Coast rock lobster. DAFF Branch Fisheries document: FISHERIES/2011/JUN/SWG-WCRL/32: 1–6.
Brandão A, Johnston SJ, and Butterworth DS. Trends in policing effort and the number of confiscations for West Coast rock lobster on a super-area basis. DAFF Branch Fisheries document: FISHERIES/2011/AUG/SWG-WCRL/46: 1–18.
Brandão A, Johnston SJ, and Butterworth DS. Further trends in policing effort and the number of confiscations for West Coast rock lobster on a Super-area basis. DAFF Branch Fisheries document: FISHERIES/2011/AUG/SWG-WCRL/48: 1–5.
Brandão A and Butterworth DS. Updated analyses of the fisheries independent monitoring survey data of the rock lobster resource of South Africa to include the 2010/11 season. DAFF Branch Fisheries document: FISHERIES/2011/SEP/SWG-WCRL/55: 1–19.
  Brandão A and Butterworth DS. General linear model and general linear mixed model standardisation of the toothfish (Dissostichus eleginoides) CPUE in the Prince Edward Islands vicinity over the period 1997–2010. DAFF Branch Fisheries document: FISHERIES/2011/OCT/SWG-DEM/48: 1–10.
Butterworth DS and Geromont HF. Issues that need to be addressed in revision of estimates of bird kills in trawling operations. DAFF Branch Fisheries document: FISHERIES/2011/MAY/SWG-DEM/11: 1.
Butterworth DS. WCRL TAC issues requiring finalisation. DAFF Branch Fisheries document: FISHERIES/2011/JUL/SWG-WCRL/35: 1–5.
Butterworth DS, Gaylard J, Brandão A, and Johnston SJ. Report of the task group to advise on appropriate options to be considered for recent changes in poaching levels for West Coast rock lobster. DAFF Branch Fisheries document: FISHERIES/2011/AUG/SWG-WCRL/50: 1–5.
Butterworth DS and Johnston SJ. Recommendations on rock lobster TAC's for the Tristan group of islands for the 2011/12 season. Document MARAM/Tristan/2011/20: 1–9.
Butterworth DS and Johnston SJ. Recommendations on adjustments of 2011/12 catch limits at Inaccessible and Nightingale islands in response to the impacts of spills of oil and soya as a result of the Oliva incident. Document MARAM/Tristan/2011/Sep/12: 1–2.
Butterworth DS and Johnston SJ. Recommendations on adjustments of 2011/12 catch limits at Inaccessible and Nightingale islands in response to the impacts of spills of oil and soya as a result of the Oliva incident. (Modified version of Sep/12.) Document MARAM/Tristan/2011/Sep/14: 1.
Butterworth DS and Johnston SJ. Suggestions arising from: Recommendations on adjustments of 2011/12 catch limits at Inaccessible and Nightingale islands in response to the impacts of spills of oil and soya as a result of the Oliva incident. (Modified version of Sep/12.) Document MARAM/Tristan/2011/Sep/15: 1.
Butterworth DS, de Moor CL, Robinson W, and Coetzee J. Collated comments from some members of the Small Pelagic Scientific Working group in response to FISHERIES/2011/SWG-PEL/29. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/34: 1–8.
Butterworth DS, de Moor CL, and Coetzee J. Collated comments from some members of the SWG-PEL in response to FISHERIES/2011/SWG-PEL/30. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/36: 1–2.
Butterworth DS, de Moor CL, van der Lingen CD, and Coetzee JC. MSC Contributor Form — PWG response to MSC documents published for public consultation and MSC Comment Form — 2011 consultation on Assessment of Low Trophic Level Fisheries (LTLF). Department of Agriculture, Forestry and Fisheries: Branch Fisheries document FISHERIES/2011/SWG-PEL/37.
Butterworth DS, de Moor CL, Coetzee JC, Twatwa NM, Shabangu FW, van der Lingen C, Phillips M, van der Westhuizen JJ, Somhlaba S, de Goede J, Geja Y, Bali A, and Durholtz D. Further comments to the MSC. Department of Agriculture, Forestry and Fisheries: Branch Fisheries Document FISHERIES/2011/SWG-PEL/48. 1–5.
de Moor CL, van der Westhuizen JJ, Durholtz D, and Coetzee J. A record of the generation of data used in the 2011 sardine and anchovy assessments. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/04: 1–27.
  de Moor CL and Butterworth DS. Assessment of the South African sardine resource using data from 1984–2010: initial results of an age-structured model. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/05: 1–16.
  de Moor CL and Butterworth DS. Assessment of the South African anchovy resource using data from 1984–2010: initial results. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/06: 1–11.
de Moor CL and Butterworth DS. Assessment of the South African anchovy resource using data from 1984–2010: variability in natural mortality. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/22: 1–14.
  de Moor CL, van der Westhuizen JJ, Coetzee J, and Butterworth DS. A record of the generation of sardine catch data. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/23: 1–7.
de Moor CL and Butterworth DS. Comparison of sardine November proportion-at-age from different length frequencies and age readers. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/39: 1–3.
de Moor CL and Butterworth DS. Extrapolation of recruit numbers to Cape Infanta in the years for which the survey only reached Cape Agulhas. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/42: 1–3.
de Moor CL. Final anchovy TAC and sardine TAB for 2011, using OPM-08. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/43: 1–5.
  de Moor CL and Butterworth DS. Assessment of the South African sardine resource using data from 1984–2010: further results of a single stock hypothesis. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/44: 1–34.
de Moor CL and Butterworth DS. Current (OMP-08) yield drop expectations relative to revised MSC target reference points for low trophic level species. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/50: 1.
de Moor CL, Coetzee J, Durholtz D, Merkle D, and van der Westhuizen JJ. A final record of the generation of data used in the 2011 sardine and anchovy assessments. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/51: 1–31.
  de Moor CL and Butterworth DS. Assessment of the South African anchovy resource using data from 1984–2010: results at the posterior mode. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/52: 1–26.
de Moor CL and Butterworth DS. Assessment of the South African anchovy resource using data from 1984–2010: results at the posterior mode. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/66: 1–29.
de Moor CL and Butterworth DS. Assessment of the South African sardine resource using data from 1984–2010: further work towards a base case single stock hypothesis. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/67: 1–31.
de Moor CL and Butterworth DS. Assessment of the South African sardine resource using data from 1984–2010: initial results for a two stock hypothesis. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/68: 1–26.
de Moor CL and Moseley C. Comments on FISHERIES/2011/SWG-PEL/62: Spatial management needed in Small pelagic fishery. Department of Agriculture, Forestry and fisheries: Branch Fisheries Document: FISHERIES/2011/SWG-PEL/69: 1–3.
de Moor CL and Butterworth DS. Assessment of the South African anchovy resource using data from 1984–2010: posterior distributions for the two base case hypotheses. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/75: 1–9.
  de Moor CL, Butterworth DS, and Coetzee J. List of alternatives to be tested during the development of OMP-12. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/76: 1–6.
de Moor CL, Butterworth DS, and Coetzee J. List of alternatives to be tested during the development of OMP-13. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/76b: 1–6.
de Moor CL. A list of the TACs and TABs required as output from OMP-12. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/77: 1–7.
  de Moor CL and Butterworth DS. Tasks related to the revision of the pelagic OMP to be completed in time for the International Stock Assessment Workshop. Branch Fisheries document: FISHERIES/2011/SWG-PEL/79: 1–2.
de Moor CL and Butterworth DS. OMP-13 development: Performance statistics and key specifications for projections. Branch Fisheries document: FISHERIES/2011/SWG-PEL/85: 1–8. (Revised version in MARAM IWS/DEC11/P/OMP/P6)
de Moor CL. Directed sardine and initial anchovy TACs and sardine TAB for 2012, using OMP-08. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/93: 1–3.
Furman LB and Butterworth DS. A preliminary evaluation of the potential use of pelagic survey data in setting the horse mackerel PUCL. DAFF Branch Fisheries document: FISHERIES/2011/MAY/SWG-DEM/16: 1–21.
Furman LB. Preliminary results from a GLM standardised CPUE series for the South Coast midwater horse mackerel fishery. DAFF Branch Fisheries document: FISHERIES/2011/AUG/SWG-DEM/41: 1–8.
Furman LB and Butterworth DS. Updated assessments and projections under alternative future catch levels for the horse mackerel resource. DAFF Branch Fisheries document: FISHERIES/2011/OCT/SWG-DEM/49: 1–32.
Furman LB. Progress on re-assessment of horse mackerel PUCL. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/19: 1.
Furman LB and Butterworth DS. Sensitivity of horse mackerel assessments to catch uncertainties. Branch Fisheries document: FISHERIES/2011/SWG-DEM&PEL/HMTT/10: 1–4.
Geromont HF and Butterworth DS. Preliminary assessment of the western and south-western Cape Carpenter resource using an age-structured production model. DAFF Branch Fisheries document: FISHERIES/2011/JUNE/LS–WG/4: 1–38.
Glazer JP and Butterworth DS. The inclusion of sub-areas in the standardisation of the Area 8 trapboat CPUE data through the application of a generalised linear mixed model. DAFF Branch Fisheries document: FISHERIES/2011/MAR/SWG-WCRL/03: 1–11.
Glazer JP and Butterworth DS. Updated GLM analyses of Area 8+. DAFF Branch Fisheries document: FISHERIES/2011/MAR/SWG-WCRL/04: 1–10.
Glazer JP and Butterworth DS. The application of a generalized linear mixed model to the Area 8+ trapboat data. DAFF Branch Fisheries document: FISHERIES/2011/APR/SWG-WCRL/19: 1–9.
Glazer JP and Butterworth DS. The application of a generalized linear mixed model to the Area 8 bakkie data. DAFF Branch Fisheries document: FISHERIES/2011/APR/SWG-WCRL/20: 1–8.
Glazer JP and Butterworth DS. An updated assessment of the South African monkfish resource, Lophius vomerinus. DAFF Branch Fisheries document: FISHERIES/2011/OCT/SWG-DEM/46: 1–11.
Johnston SJ, Butterworth DS, and Glazer JP. South Coast rock lobster OMP 2008 re-tuned. DAFF Branch Fisheries document: FISHERIES/2011/FEB/SWG-SCRL/01: 1–9.
Johnston SJ and Butterworth DS. Recommended TAC 2011 for the South Coast rock lobster resource using re-tuned OMP 2010. DAFF Branch Fisheries document: FISHERIES/2011/AUG/SWG-SCRL/06: 1–5.
Johnston SJ and Butterworth DS. Notes on the development of the new 2011 Area-disaggregation OMP for West Coast rock lobster. DAFF Branch Fisheries document: FISHERIES/2011/MAR/SWG-WCRL/01: 1–19.
Johnston SJ and Butterworth DS. Super-areal split of catches from each of the different sectors for the last four seasons of the West Coast rock lobster fishery. DAFF Branch Fisheries document: FISHERIES/2011/MAR/SWG-WCRL/06: 1–3.
Johnston SJ. Task Group report on West Coast rock lobster interim relief. DAFF Branch Fisheries document: FISHERIES/2011/MAR/SWG-WCRL/07: 1.
Johnston SJ. On possible flexibility for interim relief allocations amongst super-areas for the 2010/2011 season. DAFF Branch Fisheries document: FISHERIES/2011/MAR/SWG-WCRL/08: 1–6.
Johnston SJ. Estimate of interim relief take for the 2010/2011 season. DAFF Branch Fisheries document: FISHERIES/2011/MAR/SWG-WCRL/09: 1.
Johnston SJ and Butterworth DS. Biological issues relating to projections of the West Coast rock lobster resource into the future for OMP trials. DAFF Branch Fisheries document: FISHERIES/2011/MAR/SWG-WCRL/11: 1–9.
Johnston SJ and Butterworth DS. West Coast rock lobster catch-at-length sample sizes. DAFF Branch Fisheries document: FISHERIES/2011/MAR/SWG-WCRL/12: 1–6.
Johnston SJ and Butterworth DS. Updated West Coast rock lobster operating models. DAFF Branch Fisheries document: FISHERIES/2011/MAR/SWG-WCRL/13: 1–27.
Johnston SJ and Butterworth DS. Further updated West Coast rock lobster operating models for super-areas A1+2 and A8+. DAFF Branch Fisheries document: FISHERIES/2011/APR/SWG-WCRL/17: 1–15.
  Johnston SJ and van Zyl D. A summary of West Coast rock lobster poaching records. DAFF Branch Fisheries document: FISHERIES/2011/APR/SWG-WCRL/18: 1–13.
Johnston SJ. Super-area breakdown of West Coast rock lobster confiscations and policing records. DAFF Branch Fisheries document: FISHERIES/2011/MAY/SWG-WCRL/23: 1–18.
Johnston SJ and Butterworth DS. On specifications for OMP-2011 and associated trials. DAFF Branch Fisheries document: FISHERIES/2011/MAY/SWG-WCRL/24: 1–12.
Johnston SJ and Butterworth DS. Information required for completion of OMP 2011. DAFF Branch Fisheries document: FISHERIES/2011/JUN/SWG-WCRL/28: 1–2.
Johnston SJ. Some references relating to the previous choice of a 500 MT poaching level and the perception that poaching levels are "high". DAFF Branch Fisheries document: FISHERIES/2011/JUN/SWG-WCRL/29: 1.
Johnston SJ and Butterworth DS. Comparison of initial 2011 OMP results for two alternate poaching scenarios. DAFF Branch Fisheries document: FISHERIES/2011/JUN/SWG-WCRL/31: 1–5.
Johnston SJ and van Zyl D. Interim relief catch estimate for the 2010/2011 season. DAFF Branch Fisheries document: FISHERIES/2011/JUN/SWG-WCRL/33: 1–3.
Johnston SJ and Butterworth DS. Summary of projections of the West Coast rock lobster resource. DAFF Branch Fisheries document: FISHERIES/2011/JUL/SWG/WCRL/34: 1.
Johnston SJ. Assumptions made when working with confiscations/policing effort data. DAFF Branch Fisheries document: FISHERIES/2011/AUG/SWG-WCRL/40: 1–2.
Johnston SJ and Butterworth DS. Preliminary alternate recovery target results for alternate future poaching scenarios based on different tunings of the current OMP. DAFF Branch Fisheries document: FISHERIES/2011/AUG/SWG-WCRL/47: 1–8.
Johnston SJ and Butterworth DS. Further preliminary alternate recovery target results for alternate future poaching scenarios based on different tunings of the current OMP. DAFF Branch Fisheries document: FISHERIES/2011/AUG/SWG-WCRL/49: 1–8.
Johnston SJ and Butterworth DS. 2011 Addendum: Further preliminary alternate recovery target results for alternate future poaching scenarios based on different tunings of the current OMP. Explanation of subsistence/IR allocation. DAFF Branch Fisheries document: FISHERIES/2011/AUG/SWG-WCRL/49 Add: 1.
Johnston SJ and Butterworth DS. A new OMP for West Coast rock lobster: preliminary results. DAFF Branch Fisheries document: FISHERIES/2011/SEP/SWG-WCRL/56: 1–14.
Johnston SJ and Butterworth DS. Results for alternate candidate OMPs for the new OMP 2011 for West Coast rock lobster. DAFF Branch Fisheries document: FISHERIES/2011/OCT/SWG-WCRL/57: 121.
Johnston SJ and Butterworth DS. Addendum: Results for alternate candidate OMPs for the new OMP 2011 for West Coast rock lobster. DAFF Branch Fisheries document: FISHERIES/2011/OCT/SWG-WCRL/57–addendum: 1–2.
Johnston SJ and Butterworth DS. Results for final set of candidate OMPs for the new OMP 2011 for West Coast rock lobster. DAFF Branch Fisheries document: FISHERIES/2011/OCT/SWG-WCRL/58: 1–17.
Johnston SJ and Butterworth DS. TAC values for 2011/12 season for four candidate OMPs for the West Coast rock lobster resource. DAFF Branch Fisheries document: FISHERIES/2011/OCT/SWG-WCRL/59: 1–5.
  Johnston SJ and Butterworth DS. Simulation results for final candidate MPs for the new OMP 2011 for West Coast rock lobster. DAFF Branch fisheries document: FISHERIES/2011/DEC/SWG-WCRL/60: 1–7.
Johnston SJ. Data available for input to an age structured production model of the Tristan lobster fishery. Document MARAM/Tristan/2011/Feb/01: 1–14.
Johnston SJ and Butterworth DS. The age-structured production modelling approach for assessment of the rock lobster resources at the Tristan da Cunha group of islands. Document MARAM/Tristan/2011/Feb/02: 1–9.
Johnston SJ. Operating model results for inaccessible islands using an age-structured production model approach. Document MARAM/Tristan/2011/Feb/03: 1–9.
Johnston SJ. Updated catch length frequencies for the Tristan group of islands using factory pack category data. Document MARAM/Tristan/2011/Mar/04: 1–16.
Johnston SJ. Operating model results for Nightingale island using an age-structured production model approach. Document MARAM/Tristan/2011/Mar/05: 1–12.
Johnston SJ. Updated operating model results for Inaccessible islands using an age-structured production model approach. Document MARAM/Tristan/2011/April/07: 1–14.
Johnston SJ and Butterworth DS. Updates to the 2011 Tristan da Cunha group of islands assessment models and final assessment results. MARAM/Tristan/2011/Jun/08: 1–19.
Johnston SJ. Summary of growth rate data and analyses available for the Tristan da Cunha group of islands. MARAM/Tristan/2011/Jun/09: 1–8.
Johnston SJ and Butterworth DS. Summary of suggested baseline options for rock lobster TAC recommendations for the Tristan da Cunha group of islands (i.e. had no oil spill event occurred in 2011). MARAM/Tristan/2011/Jun/10: 1–7.
Johnston SJ and Butterworth DS. Effect of the 2011 oil and soya spill events on rock lobster yields at Inaccessible and Nightingale islands. Document MARAM/Tristan/2011/Sep/11: 1–38.
Johnston SJ and Butterworth DS. Effect of the 2011 oil and soya spill events on rock lobster yields at Inaccessible and Nightingale islands. Document MARAM/Tristan/2011/Sep/13: 1–35
  Johnston SJ. A summary of the Tristan biomass index survey results to date. MARAM/Tristan/2011/Nov/16: 1–5.
  Johnston SJ. Test fishing at Nightingale. MARAM/Tristan/2011/Nov/17: 1–7.
  Johnston SJ. Test fishing at Inaccessible. MARAM/Tristan/2011/Nov/18: 1–6.
  Johnston SJ and Butterworth DS. The age-structured production modelling approach for assessment of the rock lobster resources at the Tristan da Cunha group of islands. MARAM/Tristan/2011/Dec/19: 1–12.
Maharaj G and Butterworth DS. Summary of estimates of recent trends in abalone poaching. DAFF Branch Fisheries document: FISHERIES/2011/JUL/TG AB/13: 1–6.
Rademeyer RA. OMP-2010 outputs for 2012 TAC computations for a range of 2010 CPUE values. DAFF Branch Fisheries document: FISHERIES/2011/JUL/SWG-DEM/28: 1–2.
Rademeyer RA. 2011 Routine update of the South African hake base reference case assessment. DAFF Branch Fisheries document: FISHERIES/2011/AUG/SWG-DEM/39: 1–7.
Rademeyer RA. Output from the South African hake OMP-2010 for the 2012 TAC recommendation. DAFF Branch Fisheries document: FISHERIES/2011/AUG/SWG-DEM/40: 1–4.
Robinson W and Butterworth DS. Update of penguin model development. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/01: 1–4.
  Robinson W and Butterworth DS. Proposed timing approach to penguin tag-recapture data. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/02: 1–4.
Robinson W and Butterworth DS. Robben Island penguin model extended to include further tag data and to estimate immigration. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/32: 1–6.
Robinson W and Butterworth DS. Full description of the Robben Island penguin–fish interaction model and base case Bayesian results. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/40: 1–19.
Robinson W and Butterworth DS. Penguin model update: an improved penguin mortality relationship with sardine biomass and results of sensitivities to the base case. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/58: 1–15.
Robinson W and Butterworth DS. Results of an alternative pelagic biomass series for the relationship with penguin adult survival. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/70: 1–3.
Robinson W. Update to the Robben Island moult count series for 2011. DAFF Branch Fisheries document: FISHERIES/2011/SWG-PEL/71: 1–4.
Van Zyl D and Johnston SJ. Interim relief phase 1 (2006/2007 season). DAFF Branch Fisheries document: FISHERIES/2011/MAR/SWG-WCRL/05: 1–2.

Theses

Müller, A. Humpback whales, rock lobsters and mathematics: Exploration of assessment models incorporating stock-structure. MSc thesis: 1-176.