Research Papers and Refereed Articles
Brandão, A., Ross-Gillespie, A., Vermeulen, E., and Butterworth, D.S. 2023. A photo-identification-based assessment model of southern right whales Eubalaena australis surveyed in South African waters, with a focus on recent low counts of mothers with calves. African Journal of Marine Science 45(1): 15-27.
Goethel, D.R., Omori, K.L., Punt, A.E., Lynch, P.D., Berger, A.M., de Moor, C.L., Plagányi, É.E., Cope, J.M., Dowling, N.A., McGarvey, R., Preece, A.L., Thorson, J.T., Chaloupka, M., Gaichas, S., Gilman, E., Hesp, S.A., Longo, C., Yao, N., Methot, R.D. Oceans of plenty? Challenges, advancements, and future directions for the provision of evidence-based fisheries management advice. Rev Fish Biol Fisheries 33: 375 - 410.
Non-Peer reviewed unpublished Conference Proceedings
Butterworth, D.S. and Rademeyer, R.A. Effect of missing surveys on the performance of the adopted NABT BFT MP. SCRS/2023/177. Collect. Vol. Sci. Pap. ICCAT, Vol 80(9), 260 - 262.
Unpublished Research/Technical/Policy Documents
de Moor, C.L., Allison, C., Katara, I, and Punt, A.E. In-Depth Assessment of western North Pacific common minke whales: Baseline results for the A and B hypotheses. SC/69A/IA/01.
Moosa, N. and Butterworth, D.S. Model estimates of pre- and post-abundances of the cetaceans in the Antarctic Ecosystem. IWC SC/CMS/N23.01: 24pp.
PowerPoint Presentations
Brandão, A. and Butterworth, D.S. Initial simulation exercise to generate pack data for the chokka squid (Loligo reynaudii) resource of South Africa. MARAM/IWS/2023/Squid/P1: 18pp.
Butterworth, D.S. and Rademeyer, R.A. Meeting with DFO 12-13 January: Where we started and where we ended. Presentation to the East Canadian Herring Industry and DFO officials, 12-13 January 2023, Halifax: 13pp.
Butterworth, D.S. and Rademeyer, R.A. Southwest Nova Scotia/Bay of Fundy Herring: Alternative Candidate Management Procedures. Interim results focused on informing immediate suggestions for the 2023 TAC. Virtual presentation to Canadian DFO’s senior science leadership, 5 May 2023: 16pp.
de Moor, C.L. Finalised assessment of South African round herring, using data from 1987 to 2021. Virtual presentation to the Small Pelagic Scientific Working Group, Cape Town, 25 January 2023: 15pp.
de Moor, C.L. Proposed adjustments to the Precautionary Upper Catch Limit (PUCL) for SA round herring. Virtual presentation to the Small Pelagic Scientific Working Group, Cape Town, 25 January 2023: 12pp.
de Moor, C.L. Sardine projections based on constant catch scenarios for 2023. Virtual presentation to the Small Pelagic Scientific Working Group, Cape Town, 17 March 2023: 26pp.
de Moor, C.L. An introduction to the South African sardine resource and fishery. Presentation to the International Stock Assessment Workshop, Cape Town 27 November 2023: 17pp.
de Moor, C.L., van der Lingen, C.D. and Teske, P. A new hypothesis for South African sardine stock structure. Presentation to the International Stock Assessment Workshop, Cape Town, 29 November 2023: 9pp.
Ortega-Cisneros, K. de Moor, C.L., and Cochrane, K. Exploring the impact of fishing and climate scenarios on the South African sardine and anchovy fishery. Presentation to the 5th International Symposium of Climate Change on the World’s Oceans, Bergen, Norway, 17-21 April 2023: 14pp.
van der Lingen, C.D., de Moor, C.L. and Coetzee, J.C. Available data for determining the occurrence and distribution of Cool Temperate and Warm Temperate sardine components by life history stage. Presentation to the International Stock Assessment Workshop. Cape Town, 27 November 2023: 23pp.
Canadian Herring
Butterworth, D.S. and Rademeyer, R.A. Southwest Nova Scotia/Bay of Fundy Herring Alternative Candidate Management Procedures. Interim results focused on informing immediate suggestions for the 2023 TAC. Submitted to DFO, Canada, March 2023. 10pp.
Munden, J.G., Melvin, G.D., Butterworth, D.S. and Rademeyer, R.A. Review of the Southwest Nova Scotia/Bay of Fundy Herring Management Strategy Evaluation. Canadian Herring Science Council document: 14pp.
Greenland Halibut
Rademeyer, R.A. and Butterworth, D.S. Results for Greenland Halibut Candidate Management Procedure Trials for the final SCAA Reference Set trials. NAFO SCR Doc. 23/044: 13pp.
Tristan
Johnston, S.J. Tristan Group Biomass Survey results of Jasus tristani including data from the 2022 season. MARAM document: MARAM/TRISTAN/2023/FEB/01: 15pp.
Johnston, S.J. and Butterworth, D.S. Updated (and rescaled) Tristan Island GLM-standardised Jasus tristani lobster Powerboat CPUE to take account of data for the 2022 season. MARAM document: MARAM/TRISTAN/2023/APR/02: 10pp.
Johnston, S.J. and Butterworth, D.S. Updated 2022 GLMM-standardised lobster CPUE from Inaccessible, Nightingale and Gough islands from the Jasus tristani fishery. MARAM document: MARAM/TRISTAN/2023/APR/03: 17pp.
Johnston, S.J. and Nelson, J. Catches taken by the Powerboats, the Edinburgh and for the annual biomass surveys at Tristan da Cunha island since 1990. MARAM document: MARAM/TRISTAN/2023/APR: 3pp.
Johnston, S.J. and Butterworth, D.S. Updated 2023 Tristan da Cunha rock lobster assessment. MARAM document: MARAM/TRISTAN/2023/MAY/05: 11pp.
Johnston, S.J. and Butterworth, D.S. Nightingale island rock lobster (Jasus tristani) assessment updated for 2023. MARAM document: MARAM/TRISTAN/2023/MAY/06: 15pp.
Johnston, S.J. and Butterworth, D.S. The development of a new OMP 2023 for Tristan da Cunha island rock lobster (Jasus tristani) resource. MARAM document: MARAM/TRISTAN/2023/JUN/07: 12pp.
Johnston, S.J. and Butterworth, D.S. OMP 2023 candidates for the Jasus tristani rock lobster fishery at Nightingale island. MARAM document: MARAM/TRISTAN/2023/JUN/08: 13pp.
Johnston, S.J. and Butterworth, D.S. Recommendations on rock lobster TACs for Tristan rock lobster Jasus tristani, at Tristan, Nightingale, Inaccessible and Gough islands for the 2023/24 season. MARAM document: MARAM/TRISTAN/2023/JUL/09: 10pp.
Johnston, S.J. and Butterworth, D.S. Summary of recommendations on Jasus tristani rock lobster TACs for the Tristan group of islands for the 2023/24 season. MARAM document: MARAM/TRISTAN/2023/JUL/10: 2pp.
Consultancy and Other Activities Based on Expertise Developed in Research
Brandão, A. and Butterworth, D.S. Updated Compliance poaching trends up to 2022 for West Coast rock lobster. DFFE Fisheries document: FISHERIES/2023/JUL/SWG-WCRL/12: 15pp.
Brandão, A. and Butterworth, D.S. Analyses of the Fisheries Independent Monitoring Survey data for the rock lobster resource of South Africa to include the 2022/23 season. DFFE Fisheries document: FISHERIES/2023/JUL/SWG-WCRL/13: 35pp.
Brandão, A. and Butterworth, D.S. GLMM standardised trotline CPUE series for the toothfish resource in the Prince Edward Islands EEZ updated to include data up to the 2022 season. DFFE Fisheries document: FISHERIES/2023/OCT/SWG-DEM/10: 9pp.
Brandão, A. and Butterworth, D.S. Update of the Reference case assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include 2022 data. DFFE Fisheries document: FISHERIES/2023/OCT/SWG-DEM/11: 12pp.
Brandão, A. and Butterworth, D.S. Application of OMP-2020 for the toothfish (Dissostichus elegancies) resource in the Prince Edward Islands vicinity to provide a TAC recommendation for the 2024 “fishing-year”. DFFE Fisheries document: FISHERIES/2023/OCT/SWG-DEM/12: 5pp.A summary of how DFFE Compliance data are used to provide a trend in the extent of Poaching over time. DFFE Fisheries document: FISHERIES/2023/AUG/SWG-WCRL/17: 2pp.
Brandão, A. and Butterworth, D.S. “Replacement Yield” model fit to catch and survey data for the south coast and for the west coast kingklip resources off South Africa to include data up to 2023. DFFE Fisheries document: FISHERIES/2023/OCT/SWG-DEM/19: 14pp.
Brandão, A. and Butterworth, D.S. Initial simulation exercise to generate pack data for the chokka squid (Loligo reynaudii) resource of South Africa. International Stock Assessment Workshop document: MARAM/IWS/2023/Squid/P1: 18pp.
Butterworth, D.S. A summary of how DFFE Compliance data are used to provide a trend in the extent of Poaching over time. DFFE Fisheries document: FISHERIES/2023/AUG/SWG-WCRL/17: 2pp.
Butterworth, D.S. and Ross-Gillespie, A. A MICE approach to scoping the possible impact of guano harvests on trends in penguin abundance. DFFE Fisheries document: FISHERIES/2023/JAN/PWG-SWG/01rev: 10pp.
Butterworth, D.S. and Ross-Gillespie, A. Exploration of a MICE approach to evaluate the impact of fish abundance on penguin survival. DFFE Fisheries document: FISHERIES/2023/NOV/SWG-PEL/25rev2: 37 pp.
Butterworth, D.S. and Coetzee, J.C. “Back of the Envelope” round herring projections. DFFE Fisheries document: FISHERIES/2023/DEC/SWG-PEL/29:.
Butterworth, D.S. and Johnston, S.J. Possible approaches to detect non-stationarity (such as caused by climate change) on the dynamics of local fish stocks. International Stock Assessment Workshop Document MARAM/IWS/2023/NonSTAT/P1: 18pp.
Coetzee, J.C. and de Moor, C.L. Suggestions for setting interim TAC/Bs for 2024 in December 2023. DFFE Fisheries document: FISHERIES/2023/NOV/SWG-PEL/20: 9pp.
de Moor, C.L. Updated assessment of the South African sardine resource using data from 1984-2022. DFFE Fisheries document: FISHERIES/2023/MAR/SWG-PEL/03: 27pp.
de Moor, C.L. Sardine projections based on constant catch scenarios for 2023. DFFE Fisheries document: FISHERIES/2023/MAR/SWG-PEL/04: 51pp.
de Moor, C.L. Short term projection results for additional catch scenarios for 2023. DFFE Fisheries document: FISHERIES/2023/MAR/SWG-PEL/05: 30pp.
de Moor, C.L. Initial anchovy TAC recommendation for 2023, using OMP-18rev. DFFE Fisheries document: FISHERIES/2023/MAR/SWG-PEL/06: 2pp.
de Moor, C.L. Updated simple model of the revised stock structure hypothesis for South African sardine. DFFE Fisheries document: FISHERIES/2023/JUL/SWG-PEL/10: 32 pp.
de Moor, C.L. Final anchovy TAC for 2023, using OMP-18rev. DFFE Fisheries document: FISHERIES/2023/JUL/SWG-PEL/12: 3pp.
de Moor, C.L. Proposed equations for the revised South African sardine model population dynamics. DFFE Fisheries document: FISHERIES/2023/JUL/SWG-PEL/13: 10pp.
de Moor, C.L. Further work towards managing the South African round herring fishery. DFFE Fisheries document: FISHERIES/2023/JUL/SWG-PEL/15: 11pp.
de Moor, C.L. A revision to the South African anchovy survey length-weight relationship. DFFE Fisheries document: FISHERIES/2023/SEP/SWG-PEL/17: 7pp.
de Moor, C.L. Proposed equations for the model of the revised South African sardine stock structure hypothesis. DFFE Fisheries document: FISHERIES/2023.NOV/SWG-PEL/21: 13pp.
de Moor, C.L., van der Lingen, C.D. and Teske, P.R. A new hypothesis for South African sardine stock structure. International Stock Assessment Workshop Document MARAM/IWS/2023/Sardine/BG3: 8pp. (Also FISHERIES/2022/MAY/SWG-PEL/11REV; MARAM/IWS/2022/Sardine/P3).
de Moor, C.L., van der Lingen, C.D. and Teske, P.R. A revised hypothesis for South African sardine stock structure. International Stock Assessment Workshop Document MARAM/IWS/2023/Sardine/P3: 8pp.
de Moor, C.L. Proposed equations for the model of the revised South African sardine stock structure hypothesis. International Stock Assessment Workshop Document MARAM/IWS/2023/Sardine/P4rev: 19pp.
de Moor, C.L. Initial results from the revised population model of the South African sardine resource modelling two components in two areas. International Stock Assessment Workshop Document MARAM/IWS/2023/Sardine/P5. 18pp.
Johnston, S.J. and Butterworth, D.S. Updating the 2022 south coast rock lobster assessment. DFFE Fisheries document: FISHERIES/2023/MAY/SWG-SCRL/01: 36pp.
Johnston, S.J. South coast rock lobster OMP-2023 development. DFFE Fisheries document: FISHERIES/2023/JUL/SWG-SCRL/02: 10pp.
Johnston, S.J. and Butterworth, D.S. Initial OMP-2023 results for the south coast rock lobster resource. DFFE Fisheries document: FISHERIES/2023/JUL/SWG-SCRL/03: 8pp.
Johnston, S.J. and Butterworth, D.S. South Coast Rock Lobster: a new management target. DFFE Fisheries document: FISHERIES/2023/AUG/SWG-SCRL/06: 7pp.
Johnston, S.J. and Butterworth, D.S. Further projection results for the south coast rock lobster resource. DFFE Fisheries document: FISHERIES/2023/AUG/SWG-SCRL/07: 2pp.
Johnston, S.J., van Zyl, D. and Schultz, L. New catch-at-age data from trap samples for the 2022/23 season. DFFE Fisheries document: FISHERIES/2023/JUL/SWG-WCRL/01: 1pp.
Johnston, S.J. and Butterworth, D.S. A summary of the various west coast rock lobster fishery trends for each super-area since 2010. DFFE Fisheries document: FISHERIES/2023/AUG/SWG-WCRL/14_rev: 5pp.
Johnston, S.J. and Butterworth, D.S. Overall poaching time series for west coast rock lobster, resulting from combining estimates of legally exported and locally sold lobsters and compliance time series. DFFE Fisheries document: FISHERIES/2023/AUG/SWG-WCRL/15: 14pp.
Johnston, S.J. and Butterworth, D.S. Summary of initial updated 2023 assessments of the west coast rock lobster resource. DFFE Fisheries document: FISHERIES/2023/AUG/SWG-WCRL/16: 5pp.
Johnston, S.J. and Butterworth, D.S. Updated 2023 assessments of the west coast rock lobster resource. DFFE Fisheries document: FISHERIES/2023/AUG/SWG-WCRL/18: 19pp.
Johnston, S.J. and Butterworth, D.S. Further projections of the west coast rock lobster resource. DFFE Fisheries document: FISHERIES/2023/AUG/SWG-WCRL/19: 3pp.
Johnston, S.J. and Butterworth, D.S. Further projections of the west coast rock lobster resource. DFFE Fisheries document: FISHERIES/2023/AUG/SWG-WCRL/21_rev: 7pp.
Johnston, S.J. and Butterworth, D.S. Projections of the west coast rock lobster resource for different A7 TAC proportions. DFFE Fisheries document: FISHERIES/2023/AUG/SWG-WCRL/22: 3pp.
Johnston, S.J. and Butterworth, D.S. Updated 2023 horse mackerel assessments and projections. DFFE Fisheries document: FISHERIES/2023/OCT/SWG-DEM/09: 37pp.
Johnston, S.J. and Butterworth, D.S. Calculation of the horse mackerel demersal by-catch reserve for 2024. DFFE Fisheries document: FISHERIES/2023/OCT/SWG-DEM/09 Addendum. 1pp.
Punt, A.E., Waples, R. and Wilberg, M.J. International review panel report for the 2023 International Fisheries Stock Assessment Workshop, 27 November – 1 December 2023, UCT. MARAM document: 8pp.
Ross-Gillespie, A. and Butterworth, D.S. OMP formula output for the 2024 hake TAC, and the inclusion of the 2022 commercial and 2023 survey data in the OMP projection plots. DFFE Fisheries document: FISHERIES/2023/OCT/SWG-DEM/17rev: 7pp.
Ross-Gillespie, A. and Butterworth, D.S. Update to the hake Reference Case Operating Model with the 2022 commercial and 2023 survey data. DFFE Fisheries document: FISHERIES/2023/OCT/SWG-DEM/18rev: 14pp.
van der Lingen, C.D., de Moor, C.L. and Coetzee, J.C. Available data for determining the occurrence and distribution of Cool Temperate and Warm Temperate Sardine components by life history stage. International Stock Assessment Workshop Document MARAM/IWS/2023/Sardine/P2: 31pp. (Also FISHERIES/2023/MAY/SWG-PEL/9rev).
Penguin Panel related documents
March 2023
Butterworth, D.S. and Ross-Gillespie, A. Expert panel to review the science around small pelagic fisheries and penguins: Responses requested by Panel to Synthesis Questions. 2023 Penguin Review document MARAM/PENG/2023/MARCH/P1. 60pp.
Butterworth, D.S. Some points in response to the panel circulation re closures. 2023 Penguin Review document MARAM/PENG/2023/MARCH/P2. 4pp.
Butterworth, D.S. Items for the panel’s consideration arising from the penguin discussion. 2023 Penguin Review document MARAM/PENG/2023/MARCH/P3. 2pp.
June 2023
Butterworth, D.S. Proposal for potential future island closures. 2023 Penguin Review document MARAM/PENG/2023/JUNE/P7. Also Fisheries document FP/Panel/WP/05. 4pp.
Butterworth, D.S. Response to McInnes et al. FP/PANEL/WP/09 and 9a. 2023 Penguin Review document MARAM/PENG/2023/JUNE/WP1. Also Fisheries document FP/Panel/WP/17. 2pp.
Butterworth, D.S. Response to Sherley FP/PANEL/WP/06. 2023 Penguin Review document MARAM/PENG/2023/JUNE/WP2. Also Fisheries document FP/Panel/WP/18. 2pp.
Butterworth, D.S. Brief responses on some miscellaneous matters, including particularly on comments in McInnes et al. FP/PANEL/WP/09 and 9a, and made in his verbal presentation thereof on May 15. 2023 Penguin Review document MARAM/PENG/2023/JUNE/WP3. Also Fisheries document FP/Panel/WP/22.
Ross-Gillespie, A. and Butterworth, D.S. Reservations about the current MIBA evaluations. 2023 Penguin Review document MARAM/PENG/2023/JUNE/P4. Also Fisheries document FP/Panel/WP/02. 3pp.
Ross-Gillespie, A. and Butterworth, D.S. Correlation of the sardine and anchovy catch and biomass series. 2023 Penguin Review document MARAM/PENG/2023/JUNE/P5. Also Fisheries document FP/Panel/WP/03.
Ross-Gillespie, A. and Butterworth, D.S. Results for the section A of sensitivity runs requested by the penguin review panel. 2023 Penguin Review document MARAM/PENG/2023/JUNE/P6. Also Fisheries document FP/Panel/WP/04. 11pp.
Ross-Gillespie, A. and Butterworth, D.S. Additional sensitivity runs for the closure based estimator and re-runs of the catch based estimator following an update of the catch data. 2023 Penguin Review document MARAM/PENG/2023/JUNE/P8. Also Fisheries document FP/Panel/WP/26. 5pp.
