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Research Output

2003

Research Papers and Refereed Articles

Best PB, Rademeyer RA, Burton C, Ljungbald D, Sekiguchi K, Shimada H, Thiele D, Reeb D, and Butterworth DS. The abundance of blue whales on the Madagascar Plateau, December 1996. Journal of Cetacean Research and Management 5(3): 253–260.
Butterworth DS, Ianelli JN, and Hilborn R. A statistical model for stock assessment of southern bluefin tuna with temporal changes in selectivity. African Journal of Marine Science 25(1): 331–361.
Groeneveld JC, Butterworth DS, Glazer JP, Branch GM, and Cockcroft AC. An experimental assessment of the impact of gear saturation on an abundance index for an exploited rock lobster resource. Fisheries Research 65:453–465.
Mori M, Butterworth DS, Brandão A, Rademeyer RA, Okamura HO, and Matsuda HM. Observer experience and Antarctic minke whale sighting ability in the IWC/IDCR-SOWER surveys. Journal of Cetacean Research and Management 5(1): 1–11.
  Okamura H, Kitakado T, Hiramatsu K, and Mori M. Abundance estimation of diving animals by the double-platform line transect method. Biometrics 59: 512–520.

Published Conference Proceedings

  De Oliveira, J.A.A. and Butterworth, D.S. Potential use of environmental indices to reduce risk and/or increase yield in the South African anchovy fishery. Report of the 2nd meeting of the SPACC/IOC study group on “Use of Environmental Indices in the Management of Pelagic Fish Populations”, 9-11 November 2002, Paris. GLOBEC Special Contribution No. 6: 127-141.
Punt, A.E. and Butterworth, D.S. An initial application of the spatial structure framework for North Atlantic bluefin developed at the September 2001 bluefin mixing workshop using simple age-aggregated models. ICCAT Collective Volume of Scientific Papers 55(3): 1041-1054.
Punt, A.E. and Butterworth, D.S. Specifications and clarifications regarding the ADAPT VPA assessment/projection computations carried out during the September 2000 ICCAT West Atlantic bluefin tuna stock assessment session. ICCAT Collective Volume of Scientific Papers 55(3): 1028-1040.

Unpublished Research/Technical/Policy Documents

  Butterworth, D.S., Rademeyer, R.A., Brandão, A. and Mori, M. Quantification of possible effects on the changes of estimated minke whale abundance from the second to the third circumpolar IDCR-SOWER surveys of g(0) values less than 1 and dependent on school-size and of changes in the timing of the surveys. International Whaling Commission document: SC/55/IA12: 1-15.
  Butterworth, D.S. and Punt, A.E. MSYR—should the information which has become available since selections were made for RMP development in 1987 have changed perceptions on the likely range and relative plausibilities of values for this parameter for baleen whales? International Whaling Commission document: SC/55/RMP10: 1-15.
  Butterworth, D.S. Some thoughts on the NP Minke IST evaluation process. International Whaling Commission document: SC/55/IST/15: 1-3.
  Johnston, S.J. and Butterworth, D.S. Examination of a potential Strike Limit Algorithm for the eastern north Pacific stock of gray whales. International Whaling Commission document: SC/55/AWMP6: 1-7.
  Mori, M. and Butterworth, D.S. Consideration of multi-species interactions in the Antarctic—An initial model of the minke whale–blue whale–krill interaction. International Whaling Commission document: SC/55/Sh37: 1-21.
  Okamura, H., Kitakado, T. and Mori, M. An improved method on line transect sampling in the Antarctic minke whales survey. International Whaling Commission document: SC/55/IA05: 1-20.
  Rademeyer, R.A., Brandão, A., Mori, M. and Butterworth, D.S. Trends in Antarctic blue whale populations taking account of Area effects. International Whaling Commission document: SC/55/SH20: 1-18.
  Rademeyer, R.A., Mori, M. and Butterworth, D.S. A quick examination of the impact of inter/extrapolations on comparisons of comparable IDCR-SOWER abundance estimates for minke and killer whales. International Whaling Commission document: SC/55/IA11: 1-8.
  Tormosov, D., Brandão, A. and Best, P. Evaluating Southern Hemisphere sperm whale foetal records for evidence of regional seasonality in breeding. International Whaling Commission document: SC/55/O20: 1-16.
  Cunningham, C.L. and Butterworth, D.S. Updated assessments of the central stock of minke whales and the east Greenland-Iceland and Faroese stocks of fin whales in the North Atlantic. North Atlantic Marine Mammal Commission Scientific Committee Working Group (NAMMCO) document: SC/11/MF/5:1-50.

Consultancy and Other Activities Based on Expertise Developed in Research

  Branch, T.A. and Rademeyer, R.A. Blue whale estimates from the IDCR/SOWER surveys: updated comparisons including results from the 1998/99 to 2000/01 surveys. Journal of Cetacean Research and Management 5(Suppl.): 291-292.
  Brandão, A. and Butterworth, D.S. Updated GLM analyses applied to the commercial CPUE data for Namibian hake for the period 1992 to 2002. Namibian Ministry of Fisheries and Marine Resources document: HWG/WKShop/2003/03/Doc.1: 1-7.
  Brandão, A. and Butterworth, D.S. Application of lognormal and delta-lognormal linear models to standardise CPUE abundance indices (1994 to 2002) for orange roughy off Namibia. Namibian Ministry of Fisheries and Marine Resources document: DWFWG/WkShop/Mar03/doc2: 1-18.
  Brandão, A. and Butterworth, D.S. Stock assessment of Namibian orange roughy populations using an age-structured production model and all available indices of abundance from 1994 to 2002, and making allowance for annually variable aggregation of the stocks. Namibian Ministry of Fisheries and Marine Resources document: DWFWG/WkShop/Mar03/doc3: 1-39.
  Brandão, A., Butterworth, D.S., Glazer, J. and Johnston, S.J. The use of mixed linear (“random effects”) models to standardise the male west coast rock lobster somatic growth trend with time in a manner that allows for differences in magnitude and fluctuations in trend between locations: reference case model and other variants. Marine and Coastal Management document: WG/03/03/WCRL4: 1-17.
  Brandão, A. and Butterworth, D.S. Standardised male west coast rock lobster somatic growth trend using a mixed linear (“random effects”) model including data from the 2002/03. Marine and Coastal Management document: WG/07/03/WCRL19: 1-6.
  Brandão, A. and Butterworth, D.S. Progress on the application of an age-structured production model fitted to commercial catch-rate and catch-at-length data to assess the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity. Commission for the Conservation of Antarctic Marine Living Resources Document: WG-FSA-03/97: 1-29.
  Butterworth, D.S., Rademeyer, R.A. and Plagányi, É.E. An age-structured production model based assessment and reference point evaluation for the Gulf of Maine cod stock. US North East Fisheries Management Council document, February, 2003: 1-41.
  Butterworth, D.S., Rademeyer, R.A. and Plagányi, É.E. Results for Georges Bank cod of age-structured production model based assessments similar to those conducted for the Gulf of Maine cod stock. US North East Fisheries Management Council document, February, 2003: 1-22.
  Butterworth, D.S., Rademeyer, R.A. and Plagányi, É.E. Addendum to: Results for Georges Bank cod of age-structured production model based assessments similar to those conducted for the Gulf of Maine cod stock. US North East Fisheries Management Council document, February, 2003: 1-2.
  Butterworth, D.S., Rademeyer, R.A. and Plagányi, É.E. Further investigations of an ASPM-based assessment for the Gulf of Maine cod stock. US North East Fisheries Management Council document, April 2003: 1-22.
  Butterworth, D.S. and Mori, M. Some initial investigations of possible management procedures for southern bluefin tuna based upon age-aggregated production models. Commission for the Conservation of Southern Bluefin Tuna document: CCSBT-MP/0304/12: 1-25.
  Butterworth, D.S. and Mori, M. Further investigations of a Fox-model based management procedure for southern bluefin tuna. Commission for the Conservation of Southern Bluefin Tuna document: CCSBT-ESC/0309/37: 1-24.
  Butterworth, D.S., Rademeyer, R.A. and Plagányi, É.E. ASPM-based assessment of the Gulf of Maine cod stock: A comparison with ADAPT-VPA and extension to a Bayesian form. US North East Fisheries Management Council document, July 2003: 1-25.
  Butterworth, D.S. and Plagányi, É.E. On modeling the impact of the pelagic fishery on the penguin population. Marine and Coastal Management document: WG/Nov2003/PEL6: 1-2.
  Butterworth, D.S. Draft elements of international guidelines on principles and criteria for the ecolabelling of fish and fishery products from marine capture fisheries. Food and Agriculture Organisation of the United Nations document: 1-19.
  Cunningham, C.L. and Butterworth, D.S. Progress with 2003 updates of pilchards and anchovy assessments. Marine and coastal Management document: WG/PEL/SEP03/1: 1.
  Cunningham, C.L. and Butterworth, D.S. Data required for 2003 updates of pilchards and anchovy assessments. Marine and coastal Management document: WG/PEL/SEP03/2: 1-4.
  Cunningham, C.L. and Butterworth, D.S. Summary of estimation of uncapped pilchard and anchovy biomass for hydroacoustic surveys from 1984 to 1996. Marine and coastal Management document: WG/PEL/SEP03/3: 1-5.
  Cunningham, C.L. and Butterworth, D.S. Updated assessments of the South African sardine and anchovy resources: Preliminary. Marine and coastal Management document: WG/PEL/DEC03/3: 1-33.
  Glazer, J.P. and Butterworth, D.S. An index of abundance for the west coast rock lobster resource derived from a GLM analysis of trap, bakkie and deckboat CPUE data for input to the OMP. Marine and Coastal Management document: WG/07/03/WCRL18: 1-7.
  Hakamada, T., Fujise, Y. Butterworth, D.S., Zenitani, R. and Ishikawa, H. Extrapolation of Antarctic minke whale abundance to south of ice-edge using sexual status data from JARPA. Journal of Cetacean Research and Management 5(Suppl.): 283-284.
  Johnston, S.J. and Butterworth, D.S. West coast rock lobster 2003 assessment model update: reference case and other model variants results. Marine and Coastal Management document: WG/03/03/WCRL1: 1-28.
  Johnston, S.J. and Butterworth, D.S. Issues relating to west coast rock lobster OMP development and testing. Marine and Coastal Management document: WG/03/03/WCRL2: 1-12.
  Johnston, S.J. and Butterworth, D.S. BENEFIT 2002 comments and recommendations pertaining to west coast rock lobster. Marine and Coastal Management document: WG/03/03/WCRL3: 1-2.
  Johnston, S.J. and Butterworth, D.S. Assumptions regarding future projections of the west coast rock lobster resource for baseline trials for the 2003 OMP development process. Marine and Coastal Management document: WG/04/03/WCRL7: 1-3.
  Johnston, S.J. and Butterworth, D.S. Results of two alternative stock assessment models for the west coast rock lobster resource. Marine and Coastal Management document: WG/04/03/WCRL8: 1-18.
  Johnston, S.J. and Butterworth, D.S. West coast rock lobster 2003 robustness test rankings. Marine and Coastal Management document: WG/04/03/WCRL13: 1-3.
  Johnston, S.J. and D.S. Butterworth. Sustainable Yield functions for West Coast rock lobster. Marine and Coastal Management document, WG/07/03/WCL15: 1-5.
  Johnston, S.J. and D.S. Butterworth. Initial results of some new OMPs for the West Coast rock lobster resource. Marine and Coastal Management document, WG/07/03/WCL16: 1-31.
  Johnston, S.J. and D.S. Butterworth. Initial suggested specifications for South Coast rock lobster assessment for 2003. Marine and Coastal Management document: WG/05/03/SCL4:1-4.
  Johnston, S.J. and Butterworth, D.S. Namibian seal 2003 population assessments and projections. Namibian Ministry of Fisheries and Marine Resources document: Report to the Ministry of Fisheries and Marine Resources, Namibia: 1-36.
  Johnston, S.J. and Butterworth, D.S. Final operating models and other issues relating to the west coast rock lobster 2003 OMP development. Marine and Coastal Management document: WG/06/03/WCRL14: 1-16.
  Johnston, S.J. and Butterworth, D.S. The 2003 age-structured production model assessments and projections for the south coast rock lobster resource. Marine and Coastal Management document: WG/07/03/SCRL6: 1-21.
  Johnston, S.J. and Butterworth, D.S. Further results of alternate OMPs for the management of the west coast rock lobster resource. Marine and Coastal Management document: WG/07/03/WCRL22: 1-27.
  Johnston, S.J. and Butterworth, D.S. Relative plausibility of the two alternate west coast rock lobster assessments RC1 and RC2: summarized arguments. Marine and Coastal Management document: WG/07/03/WCRL20: 1-7.
  Johnston, S.J. and Butterworth, D.S. Further 2003 age-structured production model assessments and projections for the south coast rock lobster resource. Marine and Coastal Management document: WG/08/03/SCL7: 1-21.
  Johnston, S.J. and Butterworth, D.S. Final results of alternate OMPs for the management of the west coast rock lobster resource. Marine and Coastal Management document: WG/08/03/WCRL25: 1-32.
  Johnston, S.J., Glazer, J. and Brandão, A. West coast rock lobster TAC for the 2003 season as calculated using the updated OMP. Marine and Coastal Management document: WG/10/03/WCRL26: 1-7.
  Johnston, S.J. and Butterworth, D.S. A spatially disaggregated modeling workplan for the South African west coast rock lobster. Marine and Coastal Management document: WG/10/03/WCRL27: 1-40.
  Plagányi, É.E. and MacKenzie. A.J. Updated abalone poaching confiscation data—February 2003. Abalone Task Group document: 2003/02/01: 1-1.
  Plagányi, É.E. and Butterworth. D.S. How many Haliotis midae are there remaining? Abalone Task Group document: 2003/02/02: 1-2.
  Plagányi, É.E. and Butterworth. D.S. Abalone sustainable yield estimates under a range of future poaching level scenarios. Abalone Task Group document: 2003/03/03: 1-1.
  Plagányi, É.E. and MacKenzie. A. Preliminary data update 2003 for South African abalone Haliotis midae stock assessment in Zones A, B, and D. Marine and Coastal Management document: WG/AB/03/06/01: 1-7.
  Plagányi, É.E. Application of two General Linear Models to standardise the abalone catch-per-unit-effort data for the period 1980–2002. Marine and Coastal Management document: WG/AB/03/06/02: 1-19.
  Plagányi, É.E. and MacKenzie. A.J. Summary of abalone poaching confiscation data up until May 2003 and preliminary update of poaching trend assumptions. Marine and Coastal Management document: WG/AB/03/06/04: 1-6.
  Plagányi, É.E. and MacKenzie. A. Further data updates 2003 for South African abalone. Marine and Coastal Management document: WG/AB/03/06/05: 1-8.
  Plagányi, É.E. and Butterworth, D.S. Updated application of the age- and spatially-structured assessment model to simultaneously represent abalone resource dynamics in "normal" management Zone B and "lobster-invaded" Zone C using 2003 data. Marine and Coastal Management document: WG/AB/03/07/08: 1-39.
  Plagányi, É.E. and Butterworth, D.S. Further results related to standardizing the abalone catch-per-unit-effort data. Marine and Coastal Management document: WG/AB/03/07/07: 1-2.
  Plagányi, É.E., MacKenzie, A., Butterworth, D.S. and Tarr, R.J. Updated data available for South African abalone Haliotis midae in 2003 for Zones A,B,C and D. Marine and Coastal Management document: WG/AB/03/07/06: 1-49.
  Plagányi, É.E. and Butterworth, D.S. Results from the abalone ASPM used to simultaneously represent abalone resource dynamics in Zones A, B, C and D. Marine and Coastal Management document: WG/AB/03/07/11: 1-12.
  Plagányi, É.E. Preliminary projection results from four versions of the abalone ASPM used to simultaneously represent abalone resource dynamics in Zones A, B, C and D. Marine and Coastal Management document: WG/AB/03/07/14: 1-14.
  Plagányi, É.E., MacKenzie, A.J. and Tarr, R.J.Q. Preliminary standardization of the abalone catch-per-unit effort data for Robben Island for the period 1985–2002. Marine and Coastal Management document: WG/AB/03/07/15: 1-7.
  Plagányi, É.E. and Butterworth, D.S. Further projection results from the abalone ASPM used to simultaneously represent abalone resource dynamics in Zones A, B, C and D. Marine and Coastal Management document: WG/AB/03/08/17: 1-18.
  Plagányi, É.E. and Butterworth, D.S. Longer term abalone projection results relevant to the recent draft policy document. Marine and Coastal Management document: WG/AB/03/08/19: 1-5.
  Plagányi, É.E. Standardization of the abalone catch-per-unit effort data for Robben Island for the period 1996-2002. Marine and Coastal Management document: WG/AB/03/08/15: 1-5.
  Plagányi, É.E. and Butterworth, D.S. Summary of further projections for abalone in Zones C and D assuming a reduction in future poaching levels. Marine and Coastal Management task group document: WG/AB/03/10/01: 1-5.
  Plagányi, É.E. and Butterworth, D.S. Further projections for abalone in Zones C and D assuming a reduction in future poaching levels and some recovery of abalone in response to the removal of west coast rock lobsters from the East of Hangklip (EoH) region. Marine and Coastal Management task group document: WG/AB/03/09/01: 1-9.
  Rademeyer, R.A. and Butterworth, D.S. An updated assessment for the Namibian hake resource. Namibian Ministry of Fisheries and Marine Resources document: HWG/WKShop/2003/03/Doc.2: 1-28.
  Rademeyer, R.A. and Butterworth, D.S. Range of possible Namibian hake TACs for 2003 in terms of the revised OMP. Namibian Ministry of Fisheries and Marine Resources document: HWG/WKShop/2003/03/Doc.3: 1-2.
  Rademeyer, R.A. and Butterworth, D.S. Variants on the updated assessment for the Namibian hake resource. Namibian Ministry of Fisheries and Marine Resources document: HWG/WKShop/2003/03/Doc.4: 1-6.
  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. International Commission for the Conservation of Atlantic Tuna document: SCRS/2003/069: 1-33.
  Rademeyer, R.A., Butterworth, D.S. and Penney, A.J. Addendum to: A Bayesian assessment of the South Atlantic population of albacore which explicitly models changes in targeting. International Commission for the Conservation of Atlantic Tuna document: SCRS/2003/069-Addendum: 1-3.
  Rademeyer, R.A., Butterworth, D.S. and Brandão, A. Introduction of covariates in the half-normal form of the detection function for minke whale abundance estimation for the IDCR/SOWER surveys. Journal of Cetacean Research and Management 5(Suppl.): 275-276.
  Rademeyer, R.A. and Butterworth, D.S. 2003 updated assessment of the west coast hake. Marine and Coastal Management document: WG/10/03/D:H:16: 1-19.
  Rademeyer, R.A. and Butterworth, D.S. TAC output in terms of the Revised Management Procedure for the south coast Merluccius capensis hake resource. Marine and Coastal Management document: WG/10/03/D:H:17: 1-5.
  Rademeyer, R.A. and Butterworth, D.S. 2003 routine updated assessment for the south coast Merluccius capensis hake resource. Marine and Coastal Management document: WG/10/03/D:H:18: 1-14.
  Rademeyer, R.A. and Butterworth, D.S. 2003 routine updated assessment for the Merluccius paradoxus hake resource off the south and west coasts. Marine and Coastal Management document: WG/10/03/D:H:19: 1-9.
Rademeyer, R.A. and Butterworth, D.S. 2003 updated assessment for the Merluccius paradoxus hake resource off the south and west coasts. Marine and Coastal Management document: WG/10/03/D:H:19(Rev): 1-13.
  Rademeyer, R.A. and Butterworth, D.S. Addendum to: 2003 updated assessment for the Merluccius paradoxus hake resource off the south and west coasts. Marine and Coastal Management document: WG/10/03/D:H:19 Addendum: 1-5.
  Rademeyer, R.A. and Butterworth, D.S. 2003 assessment of the west coast M. capensis resource. Marine and Coastal Management document: WG/11/03/D:H:20: 1-11.
  Rademeyer, R.A. and Butterworth, D.S. Hake TAC recommendation options. Marine and Coastal Management document: WG/11/03/D:H:21: 1-3.
  Rademeyer, R.A. and Butterworth, D.S. Cross-check of the 2004 TAC output from the OMP for the south coast Merluccius capensis. Marine and Coastal Management document: WG/10/03/D:H:25: 1-1.

Chapter in book

  Butterworth, D.S. and Punt, A.E. The role of harvest control laws, risk and uncertainty and the precautionary approach in ecosystem-based management. In: Responsible Fisheries in the Marine Ecosystem: 311-315.