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Research Output

2004

Research Papers and Refereed Articles

Branch TA, Matsuoka K, and Miyashita T. Evidence for increases in Antarctic blue whales based on Bayesian modelling. Marine Mammal Science 20(4): 726–754.
Brandão A, Butterworth DS, Johnston SJ, and Glazer JP. Using a GLMM to estimate the somatic growth rate trend for male South African west coast rock lobster, Jasus lalandii. Fisheries Research 70: 339–349.
Butterworth DS and Plagányi ÉE. A brief introduction to some approaches to multispecies/ecosystem modeling in the context of their possible application in the management of South African fisheries. African Journal of Marine Science 26: 53–61.
De Oliveira JAA and Butterworth DS. Developing and refining a joint management procedure for the multispecies South African pelagic fishery. ICES Journal of Marine Science 61: 1432–1442.
Mori M and Butterworth DS. Consideration of multispecies interactions in the Antarctic: a preliminary model of the minke whale–blue whale–krill interaction. African Journal of Marine Science 26: 245–259.
Plagányi ÉE and Butterworth DS. A critical look at the potential of Ecopath with ecosim to assist in practical fisheries management. African Journal of Marine Science 26: 261–287.
De Oliveira JAA and Butterworth DS. Developing and refining a joint management procedure for the multispecies South African pelagic fishery. ICES Journal of Marine Science 61: 1432–1442.

Non-peer reviewed Published Conference Proceedings

  Butterworth D.S. and Brandão, A. Experiences in Southern Africa in the management of deep sea fisheries. Report of the Deep Sea Conference, Queenstown, New Zealand, December 2003 (FAO Publishing): 1–16.
  Brandão, A. and Butterworth D.S. Description of the Age-Structured Production Model (ASPM) assessment methodology used for the Namibian orange roughy (Hoplostethus atlanticus) and the South African Prince Edward Islands Patagonian toothfish (Dissostichus eleginoides). Report of the Deep Sea Conference, Queenstown, New Zealand, December 2003 (FAO Publishing): 1– 11.
  Rademeyer, R.A., Butterworth, D.S. and Penney, A.J. A Bayesian assessment of the South Atlantic population of albacore which explicitly models changes in targeting. ICCAT Collective Volume of Scientific Papers 56(4): 1360-1390.

University Publications and Works of a Popular Nature

  Plagányi, É.E. Splitting stocks and merging scientists. SANCOR Newsletter No. 176: 11–12.

Unpublished Research/Technical/Policy Documents

  Brandão, A. and D.S. Butterworth. Variants of the ASPM assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward islands vicinity which attempt to reconcile CPUE and catch-at-length data. Commission for the Conservation of Antarctic Marine Living Resources Document: WG-FSA-SAM-04/12: 1–20.
  Brandão, A. and D.S. Butterworth. Updated ASPM assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity. Commission for the Conservation of Antarctic Marine Living Resources Document: WG-FSA-04/37: 1–24.
  Brandão, A. and D.S. Butterworth. Annex 3: Some initial results of modifications to the ASPM/ADMB methodology. In: Agnew, D.J. and Kirkwood, G.P. Assessment of the status of the toothfish stock in Subarea 48.3. Commission for the Conservation of Antarctic Marine Living Resources Document: WG-FSA-04/82: 1–28.
  Butterworth, D.S. and Cochrane, K.L. Report of Discussion Group 1: International approaches to management of shared stocks: fisheries, management and external driver issues. In: Management of Shared Fish Stocks (Blackwell): 348–355.
  Butterworth, D.S. and Mori, M. Application of variants of a Fox-model based MP to the “Christchurch” SBT. Commission for the Conservation of the Southern Bluefin Tuna document: CCSBT-MP/0404/06: 1–26.
  Butterworth, D.S. and Brandão, A. A simple simulation of the behaviour of the boundary rank algorithm for demarcating a stock boundary in the presence of a cline. International Whaling Commission document: SC/56/SD9: 1–8.
  Butterworth, D.S. and Rademeyer, R.A. “Korean” minke whale population trajectories under an effort-related model for by-catch. International Whaling Commission Working Group document: 1–6.
  Butterworth, D.S. and Mori, M. Tunings of the D&M management procedure under the panel’s updated operating models. Commission for the Conservation of the Southern Bluefin Tuna document: CCSBT-ESC/0409/29: 1–13.
  Cunningham, C.L., Rademeyer, R.A. and Butterworth, D.S. Some examples of projections for fin and minke whales off West Greenland given diffusive mixing with the Central Atlantic populations. International Whaling Commission document: SC/56/AWMP7: 1–18.
  Rademeyer, R.A. and Butterworth, D.S. Sanctuary or partial sanctuary—which better facilitates estimation of MSYR? International Whaling Commission document: SC/56/SOS7: 1–7.
  Johnston, S.J. and Butterworth, D.S. Updated age-structured production modeling assessments of the Southern Hemisphere humpback whale breeding stocks A and C. International Whaling Commission document: SC/56/SH20: 1–21.
  Johnston, S.J. and Butterworth, D.S. Final set of Strike Limit Algorithms for the Eastern North Pacific stock of gray whales. International Whaling Commission document: SC/56/AWMP6: 1–21.
  Johnston, S.J. and Butterworth, D.S. Summary results for four variants of a potential Strike Limit Algorithm for the Eastern North Pacific stock of gray whales for trials as at March 2004. International Whaling Commission document: SC/M04/AWMP7: 1–7.

Consultancy and Other Activities Based on Expertise Developed in Research

  Brandão, A. and Butterworth, D.S. A summary of General Linear Model analyses applied to the commercial and survey CPUE data for Namibian hake. BENEFIT/NRF/BCMLE January 2004 Stock Assessment Workshop document: BEN/JAN04/NH/2a: 1–15.
  Brandão, A. and Butterworth, D.S. Delta-lognormal linear models applied to standardise CPUE abundance indices (1994 to 2003) for orange roughy off Namibia. Namibian Ministry of Fisheries and Marine Resources document: DWFWG/WkShop/Mar04/doc1: 1–15.
  Brandão, A. and Butterworth, D.S. Updated stock assessment of Namibian orange roughy populations under the assumption of intermittent aggregation. Namibian Ministry of Fisheries and Marine Resources document: DWFWG/WkShop/Mar04/doc2: 1–38.
  Brandão, A. and Butterworth, D.S. Assessing the orange roughy south of Johnies. Namibian Ministry of Fisheries and Marine Resources document: DWFWG/WkShop/Mar04/doc3: 1–10.
  Brandão, A. and Butterworth, D.S. Standardisation of commercial catch per unit effort data of Namibian hake for the period 1992 to 2003. Namibian Ministry of Fisheries and Marine Resources document: HWG/WkShop/2004/03/doc2: 1–7.
Brandão, A. and Butterworth, D.S. General linear mixed model analyses of male west coast rock lobster somatic growth for each of three super-areas where mark-recapture programmes take place. Marine and Coastal Management document: WG/04/04/WCRL12: 1–9.
  Brandão, A. and Butterworth, D.S. On the impact on estimation of west coast rock lobster somatic growth trends of reducing the size of the data set used. Marine and Coastal Management document: WG/04/05/WCRL14: 1–7.
  Brandão, A. and Butterworth, D.S. Updated standardised male west coast rock lobster somatic growth trend using the “less data” selection. Marine and Coastal Management document: WG/07/04/WCRL20: 1–11.
  Brandão, A., Rademeyer, R.A. and Butterworth, D.S. First attempt to obtain a multiplicative bias calibration factor between the Africana with the old and the new gear. Marine and Coastal Management document: WG/11/04/D:H:26: 1–2.
  Brandão, A. and Butterworth, D.S. Further analysis of Namibian hake CPUE and associated data queries. Namibian Ministry of Fisheries and Marine Resources document: Doc1: 1–4.
  Brandão, A. and Butterworth, D.S. Further investigations of the Namibian hake CPUE data. Namibian Ministry of Fisheries and Marine Resources document: Doc3: 1–16.
Brandão, A. and Butterworth, D.S. Comparison of trend slopes of Namibian hake survey biomass and standardised commercial CPUE indices. BENEFIT/NRF/BCMLE December 2004 Stock Assessment Workshop document: BEN/DEC04/H/NA/4a: 1–4.
Brandão, A., Rademeyer, R.A. and Butterworth, D.S. Obtaining a multiplicative bias calibration factor between the Africana with the old and the new trawl gear. BENEFIT/NRF/BCMLE December 2004 Stock Assessment Workshop document: BEN/DEC04/H/SA/3a: 1–5.
Brandão, A. Comparison of growth curves. Appendix 5 of BENEFIT (2004) report: BENEFIT/NRF/BCMLE Stock Assessment Workshop (6–11 December 2004, University of Cape Town): 1–2.
Brandão, A. Additional Calculations Related to Changes in Survey and CPUE Indices for Namibian Hake. Appendix 15 of BENEFIT (2004) report: BENEFIT/NRF/BCMLE Stock Assessment Workshop (6–11 December 2004, University of Cape Town): 1–1.
  Butterworth, D.S. and Rademeyer, R.A. An update on OMP-based management advice provided for the TAC for the Namibian hake resource. BENEFIT/NRF/BCMLE January 2004 Stock Assessment Workshop document: BEN/JAN04/NH/6a: 1–2.
  Butterworth, D.S. Past biological comparisons of trawling vs. longlining of South African hake. BENEFIT/NRF/BCMLE January 2004 Stock Assessment Workshop document: BEN/JAN04/SAH/6b: 1.
  Butterworth, D.S. and Rademeyer, R.A. Current South African hake management recommendations. BENEFIT/NRF/BCMLE January 2004 Stock Assessment Workshop document: BEN/JAN04/SAH/6a: 1–7.
  Butterworth, D.S. and Rademeyer, R.A. Species disaggregated assessments of the South African hake resource. BENEFIT/NRF/BCMLE January 2004 Stock Assessment Workshop document: BEN/JAN04/SAH/3a: 1–23.
  Butterworth, D.S. and Rademeyer, R.A. Simultaneous assessment of the M. capensis and M. paradoxus resources, for the South and West coasts combined. BENEFIT/NRF/BCMLE January 2004 Stock Assessment Workshop document: BEN/JAN04/SAH/3b: 1–18.
  Butterworth, D.S. and Rademeyer, R.A. Update on the estimation of Merluccius capensis and M. paradoxus proportions at depth from survey. BENEFIT/NRF/BCMLE January 2004 Stock Assessment Workshop document: BEN/JAN04/SAH/2b: 1–5.
  Butterworth, D.S. and Rademeyer, R.A. Potential topics for future data collection, analysis and research for the Southern African hake resources. BENEFIT/NRF/BCMLE January 2004 Stock Assessment Workshop document: BEN/JAN04/HB/7a: 1–8.
  Butterworth, D.S. Some comments on the 2003 NAFO Greenland halibut stock assessment and a review thereof. Report to Spanish Fishery interests: 1–3.
Butterworth, D.S. and Rademeyer, R.A. What is an operational management procedure (OMP)? (With some examples related to Namibian hake). Report to Namibian Ministry of Fisheries and Marine Resources: HWG/WKShop/2004/03/Doc.4: 1–6.
Butterworth, D S. Some brief comments on "A relationship study between MCS and different management regimes in the small pelagic fishery in South Africa". Marine and Coastal Management document: WG/AUG2004/pel/07: 1–2.
  Butterworth, D.S. Plagányi, É. Variability, ecosystem states and regime shifts—let's define them before we talk about them (plus Addendum: Regime shift problem—answers (?)). BCLME International Workshop on Forecasting, Cape Town, November 2004: 1–3 + 1–5.
Butterworth, D.S. Proposed assessment/management related analysis initiatives for the South African horse mackerel. BENEFIT/NRF/BCMLE December 2004 Stock Assessment Workshop document: BEN/DEC04/HM/SA/6b: 1–2.
Butterworth, D.S., Rademeyer, R.A., Leslie, R.W. and Kirchner, C. BENEFIT/NRF/BCLME January 2004 Recommendations for Hake, with Comments and Progress made. BENEFIT/NRF/BCMLE December 2004 Stock Assessment Workshop document: BEN/DEC04/H/ALL/1a: 1–5.
Butterworth, D.S. Possible approaches for developing OMPs which output ranges rather than unique values for TACs. BENEFIT/NRF/BCMLE December 2004 Stock Assessment Workshop document: BEN/DEC04/H/NA/4c: 1–5.
Butterworth, D.S., Rademeyer, R.A. Is MSYL currently an appropriate target level for the Namibian hake resource? BENEFIT/NRF/BCMLE December 2004 Stock Assessment Workshop document: BEN/DEC04/H/NA/4d: 1–3.
  Butterworth, D.S., Rademeyer, R.A., Cunningham, C. and Johnston, S.J. Management procedure approaches as applied in South Africa. In: Report of a Workshop on the Evaluation of Alternative Harvest Strategies, Ministry of Fisheries, Wellington, New Zealand, 22-25.
Butterworth, D.S. and Rademeyer, R.A. Short report on results from alternative assessments of the Greenland halibut resource. Report to Spanish Fishery interests: 1–2.
  Cunningham, C.L. and Butterworth, D.S. Updated assessments of the South African sardine and anchovy resources: base case results. Marine and Coastal Management document: WG/PEL/JAN04/1: 1–36.
  Cunningham, C.L. and Butterworth, D.S. Some preliminary results regarding harvest impacts given the updated pelagic assessments. Marine and Coastal Management document: WG/PEL/FEB04/1: 1–7.
  Cunningham, C.L. and Butterworth, D.S. OMP-04 development and testing. Marine and Coastal Management document: WG/PEL/APR04/03: 1–25.
  Cunningham, C.L. and Butterworth, D.S. Base Case Bayesian assessment of the South African anchovy resource. Marine and Coastal Management document: WG/PEL/APR04/01: 1–19.
  Cunningham, C.L. and Butterworth, D.S. Base Case Bayesian assessment of the South African sardine resource. Marine and Coastal Management document: WG/PEL/APR04/02: 1–22.
  Cunningham, C.L. and Butterworth, D.S. Some notes on risk definition for OMP-04. Marine and Coastal Management document: WG/PEL/MAR04/01: 1–10.
  Cunningham, C.L. and Butterworth, D.S. Further sensitivity testing of OMP-04. Marine and Coastal Management document: WG/PEL/MAY04/04: 1–12.
Cunningham, C.L. and Butterworth, D.S. Some robustness tests to the Base Case assessment of the South African anchovy and sardine resources. Marine and Coastal Management document: WG/PEL/MAY04/03: 1–12.
  Cunningham, C.L. and Butterworth, D.S. Initial sensitivity testing of OMP-04 to variations in bycatch control rules. Marine and Coastal Management document: WG/PEL/MAY04/02: 1–8.
  Cunningham, C.L. and Butterworth, D.S. Risk re-definition for OMP-04, given Bayesian assessment results. Marine and Coastal Management document: WG/PEL/MAY04/01: 1–7.
  Cunningham, C.L. and Butterworth, D.S. Potential future TACs and TABs under OMP-04. Marine and Coastal Management document: WG/PEL/JUN04/06: 1–5.
  Cunningham, C.L. and Butterworth, D.S. Revised sardine and anchovy TACs and sardine TAB for 2004, using OMP-04. Marine and Coastal Management document: WG/PEL/JUN04/05: 1.
  Cunningham, C.L. and Butterworth, D.S. OMP-04 description. Marine and Coastal Management document: WG/PEL/JUN04/01: 1–14.
  Cunningham, C.L., Plagányi, É.E., Butterworth, D.S. and Johnston, S.J. Comments on proposed South African science and modeling group workplan. Marine and Coastal Management document: WG/EAF/AUG04/04: 1–11.
  Cunningham, C.L. and Butterworth, D.S. Data requirements for the next sardine and anchovy assessments. Marine and Coastal Management document: WG/PEL/AUG04/07: 1–2.
Cunningham, C.L. and Butterworth, D.S. Exceptional circumstances in OMP-04. Marine and Coastal Management document: WG/PEL/AUG04/03: 1–14.
Cunningham, C.L. and Butterworth, D.S. OMP-04 under robustness test to the base case assessments of the South African anchovy and sardine resources. Marine and Coastal Management document: WG/PEL/AUG04/04: 1–20.
  Cunningham, C.L. and Butterworth, D.S. Implementing OMP-04. Marine and Coastal Management document: WG/PEL/AUG04/05: 1–3.
  Cunningham, C.L. and Butterworth, D.S. Update of potential future sardine TACs under OMP-04. Marine and Coastal Management document: WG/PEL/AUG04/06: 1–6.
  Cunningham, C.L. and Roel, B.A. Development of a Bayesian state-space model for Iberian sardine. EU project: SARdine DYNamics and stock structure in the North-east Atlantic document: 1–32.
  Cunningham, C.L. and Butterworth, D.S. Further exceptional circumstances testing for OMP-04. Marine and Coastal Management document: WG/DEC2004/PEL/02: 1–7.
  Cunningham, C.L. and Butterworth, D.S. Initial Sardine and Anchovy TACs and Sardine TAB for 2005, Using OMP-04. Marine and Coastal Management document: WG/DEC2004/PEL/05: 1-3.
  Glazer, J.P. and Butterworth, D.S. The General Linear Models applied to standardize the catch per unit effort data of the Cape hake stocks, Merluccius capensis and M. paradoxus, caught offshore off the coast of South Africa. BENEFIT/NRF/BCMLE January 2004 Stock Assessment Workshop document: BEN/JAN04/SAH/2a: 1–22.
  Glazer, J.P. and Butterworth, D.S. An updated assessment of the South African squid resource, Loligo vulgaris reynaudii. Marine and Coastal Management document: Squid Working Group: 1–31.
  Johnston, S.J. and Butterworth, D.S. Further Namibian seal assessments and deterministic projections under a simple OMP. BENEFIT/NRF/BCMLE January 2004 Stock Assessment Workshop document: BEN/JAN04/NS/3: 1–22.
  Johnston, S.J. and Butterworth, D.S. Namibian seal population assessments and. BENEFIT/NRF/BCMLE January 2004 Stock Assessment Workshop document: BEN/JAN04/NS/2: 1–31.
  Johnston, S.J. and Butterworth, D.S. BENEFIT 2002 recommendations for Namibian seals, with comments on progress made. BENEFIT/NRF/BCMLE January 2004 Stock Assessment Workshop document: BEN/JAN04/NS/1: 1–9.
  Johnston, S.J. Comparison between a 10% or 15% maximum TAC change constraint for the west coast rock lobster OMP. Marine and Coastal Management document: WG/01/04/WCRL1: 1–6.
  Johnston, S.J. Summary of area-by-area data for west coast rock lobster. Marine and Coastal Management document: WG/01/04/WCRL2: 1–3.
  Johnston, S.J. and Butterworth, D.S. A compilation of data to be used for spatial disaggregated assessments of the west coast rock lobster resource. Marine and Coastal Management document: WG/03/04/WCRL8: 1–45.
  Johnston, S.J., Glazer, J. and van Zyl, D. A compilation of data to be used for spatial disaggregated assessments of the west coast rock lobster resource. Marine and Coastal Management document: WG/04/04/WCRL9: 1–49.
  Johnston, S.J. and Butterworth, D.S. Issues relating to discrepancies in the areal breakdown of historic catch. Marine and Coastal Management document: WG/04/04/WCRL10: 1–5.
  Johnston, S.J. and Butterworth, D.S. An update of initial results of a surplus production modeling approach for three spatially disaggregated components of the west coast rock lobster resource. Marine and Coastal Management document: WG/04/04/WCRL11: 1–13.
  Johnston, S.J. and Butterworth, D.S. Initial report on the stock assessment of the Tristan rock lobster resource. Report to the Tristan Lobster Industry: 1–34.
  Johnston, S.J. and Butterworth, D.S. 2004 Namibian seal assessments and projections. Namibian Ministry of Fisheries and Marine Resources document: 1–19.
Johnston, S.J. and Butterworth, D.S. The 2004 age-structured production model assessments and projections for the South Coast rock lobster resource. Marine and Coastal Management document: WG/07/04/SCL:10: 1–26.
  Johnston, S.J. and Butterworth, D.S. Initial suggested specifications for reference case south coast rock lobster assessment for 2004. Marine and Coastal Management document: WG/06/04/SCL4: 1–5.
  Johnston, S.J., Glazer, J. and Brandão, A. West coast rock lobster TAC for the 2004 season as calculated using the current OMP. Marine and Coastal Management document: WG/07/04/WCRL21: 1–6.
  Johnston, S.J., Glazer, J. and van Zyl, D. A final compilation of data to be used for spatial disaggregated assessments of the west coast rock lobster resource. Marine and Coastal Management document: WG/07/04/WCRL22: 1–63.
  Johnston, S.J., Brandão, A. and Butterworth D.S. Refinement of replacement yield model fit to catch and survey data for the Angolan horse mackerel. Report to the Marine Research Institute (IIM), Luanda, Angola: 1–10.
Johnston, S.J., Butterworth, D.S. and Leslie, R.W. Historical background to the South African horse mackerel fishery and its management. BENEFIT/NRF/BCMLE December 2004 Stock Assessment Workshop document: BEN/DEC04/HM/SA/1a: 1–6.
Johnston, S.J., Butterworth, D.S. and Leslie, R.W. Current data available for the South African horse mackerel resource. BENEFIT/NRF/BCMLE December 2004 Stock Assessment Workshop document: BEN/DEC04/HM/SA/1b: 1–10.
Johnston, S.J. and Butterworth, D.S. Summary of biological information used in assessment of the South African horse mackerel. BENEFIT/NRF/BCMLE December 2004 Stock Assessment Workshop document: BEN/DEC04/HM/SA/3a: 1–5.
Johnston, S.J. and Butterworth, D.S. The South African horse mackerel assessment using an age-structured production model, with future biomass projections. BENEFIT/NRF/BCMLE December 2004 Stock Assessment Workshop document: BEN/DEC04/HM/SA/4a: 1–24.
Johnston, S.J. and Butterworth, D.S. A list of data which could be extracted for future South African horse mackerel assessments. BENEFIT/NRF/BCMLE December 2004 Stock Assessment Workshop document: BEN/DEC04/HM/SA/6a: 1–4.
Johnston, S.J. Further Angolan horse mackerel assessments. Appendix 11 of BENEFIT (2004) report: BENEFIT/NRF/BCMLE Stock Assessment Workshop (6–11 December 2004, University of Cape Town): 1–6.
Johnston, S.J. Replacement Yield Model fits to Angolan horse mackerel data. Appendix 12 of BENEFIT (2004) report: BENEFIT/NRF/BCMLE Stock Assessment Workshop (6–11 December 2004, University of Cape Town): 1–5.
  Plagányi, É.E. Summary of Punt and Butterworth Minimal Realistic Model approach to model the biological interactions among the Cape fur seal and the two Cape hake populations on the South African west coast. BENEFIT/NRF/BCMLE January 2004 Stock Assessment Workshop document: BEN/JAN04/HB/5a: 1–9.
  Plagányi, É.E. Summary of potential approaches to model biological interactions, particularly among the two Cape hake populations on the South African west coast. BENEFIT/NRF/BCMLE January 2004 Stock Assessment Workshop document: BEN/JAN04/HB/5b: 1–15.
  Plagányi, É.E. Update of General Linear Model used to standardise the abalone catch-per-unit-effort data for the period 1980–2003. Marine and Coastal Management document: WG/AB/04/08/05: 1–12.
  Plagányi, É.E. and Butterworth, D.S. Preliminary results from the abalone ASPM used to simultaneously represent abalone resource dynamics in Zones A, B, C and D in 2004. Marine and Coastal Management document: WG/AB/04/08/06: 1–22.
  Plagányi, É.E. and Butterworth, D.S. Long term abalone projection results 2004. Marine and Coastal Management document: WG/AB/04/08/07: 1–7.
  Plagányi, É.E. and MacKenzie, A. Data updates 2004 for South African abalone. Marine and Coastal Management document: WG/AB/04/08/02: 1–22.
  Plagányi, É. Immediate future multi-species modeling research priorities. Marine and Coastal Management document: WG/EAF/AUG04/05 and also WG/AB/04/08/11: 1–7.
  Plagányi, É.E. and Butterworth, D.S. What are the potential benefits to abalone rights holders of introducing an additional compliance levy? Marine and Coastal Management document: WG/AB/04/08/12: 1–4.
  Plagányi, É.E. and Butterworth, D.S. Final projection results for abalone in Zones A–D. Marine and Coastal Management document: WG/AB/04/08/10: 1–10.
  Rademeyer, R.A. and Butterworth, D.S. Routine updated assessment for the Namibian hake resource. BENEFIT/NRF/BCMLE January 2004 Stock Assessment Workshop document: BEN/JAN04/NH/3a: 1–30.
  Rademeyer, R.A. and Butterworth, D.S. First attempt at a length-based assessment for the Namibian hake resource. BENEFIT/NRF/BCMLE January 2004 Stock Assessment Workshop document: BEN/JAN04/NH/3b: 1–14.
  Rademeyer, R.A. and Butterworth, D.S. Updated assessment of the Namibian hake resource, including both catch-at-age and catch-at-length information. Namibian Ministry of Fisheries and Marine Resources document: HWG/WkShop/2004/02/doc1: 1–30.
  Rademeyer, R.A. and Butterworth, D.S. Range of possible Namibian hake TACs for 2004 in terms of the revised. Namibian Ministry of Fisheries and Marine Resources document: HWG/WkShop/2004/02/doc3: 1–30.
  Rademeyer, R.A. and Butterworth, D.S. Proposed model framework to form the basis for immediate future assessments of the South African hake resource. Marine and Coastal Management document: WG/03/04/D:H:5: 1–17.
  Rademeyer, R.A. and Butterworth, D.S. Implications of different future catch levels for M. capensis on the south coast. BENEFIT/NRF/BCMLE January 2004 Stock Assessment Workshop document: BEN/JAN04/SAH/6c: 1–2.
  Rademeyer, R.A. and Butterworth, D.S. Preliminary revised assessments of the Merluccius paradoxus and M. capensis resources for the south and west coasts combined. Marine and Coastal Management document: WG/08/04/D:H:12: 1–21.
  Rademeyer, R.A. and Butterworth, D.S. Splitting species in the Namibian commercial hake catches. Namibian Ministry of Fisheries and Marine Resources document: 1–2.
  Rademeyer, R.A. and Butterworth, D.S. Revised assessments of the Merluccius paradoxus and M. capensis resources for the south and west coasts combined. Marine and Coastal Management document: WG/11/04/D:H:25: 1–34.
  Rademeyer, R.A. and Butterworth, D.S. Updated South African hake data discussion. Marine and Coastal Management document: WG/11/04/D:28: 1–3.
  Rademeyer, R.A. Brandão, A. and Butterworth, D.S. Further calculations on the assessments of the South African hake resource. Marine and Coastal Management document: WG/11/04/D:H:27: 1–7.
Rademeyer, R.A., and Butterworth, D.S. Revised assessments of the Merluccius paradoxus and M. capensis resources for the south and west coasts combined. BENEFIT/NRF/BCMLE December 2004 Stock Assessment Workshop document: BEN/DEC04/H/SA/3b: 1–36.
Rademeyer, R.A., and Butterworth, D.S. Update of the proposed model framework to form the basis for immediate future assessments of the South African hake resource. BENEFIT/NRF/BCMLE December 2004 Stock Assessment Workshop document: BEN/DEC04/H/SA/3c: 1–14.
Rademeyer, R.A., and Butterworth, D.S. Further updates of an assessment of the Namibian hake resource, including both catch-at-age and catch-at-length information. BENEFIT/NRF/BCMLE December 2004 Stock Assessment Workshop document: BEN/DEC04/H/NA/4b: 1–35.
Rademeyer, R.A., and Butterworth, D.S. Sensitivities on the Assessment of the Namibian Horse Mackerel Resource. Appendix 8 of BENEFIT (2004) report: BENEFIT/NRF/BCMLE Stock Assessment Workshop (6–11 December 2004, University of Cape Town): 1–3.
Rademeyer, R.A., and Butterworth, D.S. Assessment of the Namibian Horse Mackerel Resource, Including Both Catch-at-Age and Catch-at-Length Information. Appendix 9 of BENEFIT (2004) report: BENEFIT/NRF/BCMLE Stock Assessment Workshop (6–11 December 2004, University of Cape Town): 1–6.
  Somhlaba, S., Plagányi, É.E., Butterworth, D.S. and Rademeyer, R.A. What is the potential for the constraints associated with ECOPATH to improve estimates of biomass and productivity in the southern Benguela region? BENEFIT/NRF/BCMLE January 2004 Stock Assessment Workshop document: BEN/JAN04/SAH/5a: 1–12.
  Somhlaba, S., Brandão, A. and Butterworth, D.S. A preliminary study of the observer effect on board the commercial pelagic vessels. Marine and Coastal Management document: WG/AUG2004/PEL/09b: 1–8.
  Somhlaba, S., Brandão, A. and Butterworth, D.S. Further results on the effect of observers on board the commercial pelagic vessels. Marine and Coastal Management document: WG/DEC2004/PEL/06: 1–4.
  van Zyl, D., Jacobs, A., Fernandes, G. and Johnston, S. Task group report on west coast rock lobster catch record. Marine and Coastal Management document: WG/05/04/WCRL15: 1–8.

Chapter in book

  Butterworth, D.S. and Penney, A.J. Allocation in high seas fisheries: avoiding meltdown. In: Management of Shared Fish Stocks (Blackwell): 165-189.