2026

Brandao, A., Ross-Gillespie, A., Vermeulen, E. and Butterworth, D.S. Updated application of a photo-identification based assessment model of southern right whales (Eubalaena australis) in South African waters to include data revision and extension to 2024. IWC document SC/70/SH02: 18pp.

Brandao, A., Ross-Gillespie, A., Charlton, C. and Butterworth, D.S. Results of the Common model applied to the south-western Australian southern right whale photo-identification data. IWC Working Paper 2026: 26pp.

Brandao, A. and Butterworth, D.S. A management procedure for the Patagonian toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity. CCAMLR WG-SAM-2026/23, 29 June 2026: 34pp.

Brandao, A. and Butterworth, D.S. A Management Procedure for the toothfish in the Prince Edward Islands vicinity. CCAMLR WG-SAM-2026, 13-17 July 2026: 10 slides.

Butterworth, D.S. Progress on MSE in some tuna RFMOs since the June 2018 workshop in Seattle. Presentation to the Global Tuna RFMO MSE workshop, Rome, 20–22 January, 2026: 17 slides

de Moor, C.L. Explicitly Incorporating Ecosystem-Based Fisheries Management (EBFM) into Management Strategy Evaluation (MSE). Presentation to the Pelagic Advisory Council’s workshop on Furthering the implementation of EBFM through MSE, Brussels, 10 February 2026: 22 slides.

de Moor, C.L. Explicitly Incorporating Ecosystem-Based Fisheries Management (EBFM) into Management Strategy Evaluation (MSE). Presented to the ICES/PICES Symposium Navigating Changes in Small Pelagic Fish and Forage Communities: Climate, Ecosystems, and Sustainable Fisheries, 4th May 2026: 22 slides.

de Moor, C.L. A brief summary of work leading up to the MSE results presented in FISHERIES/2026/JUL/SWG-PEL/32. Presented to the DFFE Small Pelagic Scientific Working Group, 16th July 2026: 8 slides.

de Moor, C.L. Managing the fishery for South African sardine during periods of changes in the understanding of stock structure. Presented to the World Conference of Natural Resource Modelling, 30th June 2026: 23 slides.

de Moor, C.L. Sardine projections under a range of simple candidate management procedures and 5 different operating models. Presented to the DFFE Small Pelagic Scientific Working Group, 16 July 2026: 15 slides.

Taylor, N.G. and Butterworth, D.S. Probable Confusion: Why Our Brains, Our choices, and Our Models Can Mislead Us About Probability in MSE and Stock Assessment. Presentation to the Global Tuna RFMO MSE workshop, Rome, 20–22 January, 2026: 15 slides

Butterworth, D.S. and Rademeyer, R.A. Modelling 3LN Redfish with Schaefer model including one recruitment pulse. NAFO Scientific Council Research Document. NAFO SCR Doc 26/008: 11pp.

Butterworth, D.S. and Rademeyer, R.A. Sensitivity of median Greenland halibut MP projections for catch and exploitable biomass for different values of the µ control parameter. NAFO Scientific Council Research Document, NAFO SCR Doc 26/043: 3 pp.

Butterworth, D.S. and Rademeyer, R.A. Evaluation of Management procedure (MP) for Canadian 4VWX Herring: 12pp.

Johnston, S.J. Tristan Group Biomass Survey results for Jasus tristani including data from the 2025 season. MARAM/TRISTAN/2026/MAR/01: 15pp.

Johnston, S.J. Updated (and rescaled) Tristan Island GLM-standardised Jasus tristani lobster Powerboat CPUE to take account of data for the 2025 season. MARAM/Tristan/2026/MAR/02: 10pp.

Johnston, S.J. Updated 2025 GLMM-standardised lobster CPUE from Inaccessible, Nightingale and Gough islands from the Jasus tristani fishery. MARAM/Tristan/2026/APR/03: 17pp.

Johnston, S.J. Catches taken by the Powerboats, the Edinburgh and for the annual Biomass surveys at Tristan da Cunha Island since 1990. MARAM/Tristan/2026/APR/04: 3pp.

Johnston, S.J. Updated 2026 Tristan da Cunha rock lobster assessment. MARAM/Tristan/2026/MAY/05: 12pp.

Johnston, S.J. Nightingale island rock lobster (Jasus tristani) assessment updated for 2026. MARAM/TRISTAN/2026/MAY/06: 17pp.

Johnston, S.J. and Butterworth, D.S. The development of a new OMP 2026 for Tristan da Cunha Island rock lobster (Jasus tristani) resource. MARAM/TRISTAN/2026/MAY/07: 14pp.

Johnston, S.J. OMP 2026 candidates for the Jasus tristani rock lobster fishery at Nightingale Island. MARAM/TRISTAN/2026/JUN/08: 17pp.

Johnston, S.J. The development of a new OMP 2026 for Tristan da Cunha Island rock lobster (Jasus tristani) resource. MARAM/TRISTAN/2026/JUN/09: 3pp.

Johnston, S.J. Recommendations on rock lobster TACs for Tristan rock lobster Jasus tristani, Inaccessible and Gough Islands for the 2026/27 season. MARAM/TRISTAN/2026/JUL/10: 7pp.

Johnston, S.J. Summary of recommendations on Jasus tristani rock lobster TACs for the Tristan group of islands for the 2026/27 season. MARAM/TRISTAN/2026/JUL/11: 2pp.

Brandao, 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 2026 “fishing-year”. DFFE Branch Fisheries document. FISHERIES/2025/OCT/SWG-DEM/14: 8pp.

Brandao, A. and Butterworth, D.S. The way forward for an assessment model of the chokka squid (Loligo reynaudii) resource of South Africa. DFFE Branch Fisheries document. FISHERIES/2026/FEB/SWG-SQ/06: 3pp

Brandao, A. Outstanding data to incorporate in the chokka squid model fitting process. DFFE Branch Fisheries document. FISHERIES/2026/MAY/SWG-SQ/25: 2pp.

Brandao, A. and Butterworth, D.S. Estimated poaching trends until 2025 for West Coast rock lobster. DFFE Branch Fisheries document. FISHERIES/2026/JUL/SWG/WCRL/07: 15pp.

Brandao, A. and Butterworth, D.S. Analyses of the Cape Point Zone Fisheries Independent Monitoring Survey (FIMS) data for the West Coast rock lobster resource to include the 2025/26 season. DFFE Branch Fisheries document. FISHERIES/2026/AUG/SWG/WCRL/08: 12pp.

Brandao, A. and Butterworth, D.S. Updated poaching trends for abalone in Zones A to D and which includes data up to 2025. DFFE Branch Fisheries document. FISHERIES/2026/AUG/SWG-AB/02: 10pp

Brandao, A. and Butterworth, D.S. Updated poaching trends for abalone in Zones A to G and Zones E to G which includes data up to 2025. DFFE Branch Fisheries document. Fisheries/2026/AUG/SWG-AB/03: 8pp

Brandao, A. Available data to fit the abalone spatial-and age-structured assessment model for Zones A, B, C and D. DFFE Branch Fisheries document. FISHERIES/2026/AUG/SWG-AB/04: 27pp.

Brandao, A. and Butterworth, D.S. Updated abalone spatial-and age-structured assessment model for Zones A, B, C and D to include data up to the 2025/26 season. DFFE Branch Fisheries document. FISHERIES/2026/AUG/SWG-AB/05: 24pp.

Butterworth, D.S. Further initiatives in the EIM TG. DFFE Branch Fisheries document. FISHERIES/2026/MAY/SWG-PEL/EIMTG/05: 2pp.

de Moor, C.L. Changes to the likelihood of the sardine assessment. DFFE Branch Fisheries document. FISHERIES/2026/JAN/SWG-PEL/01: 14pp.

de Moor, C.L. Estimating total sardine recruitment and proportions by stock and coast. DFFE Branch Fisheries document. FISHERIES/2026/FEB/SWG-PEL/03: 12pp.

de Moor, C.L. Estimating total sardine recruitment and proportions by stock and coast: further work towards selecting prior distributions. DFFE Branch Fisheries document. FISHERIES/2026/APR/SWG-PEL/13rev: 30pp.

de Moor, C.L. Estimates of total production from the Baseline anchovy assessment. DFFE Branch Fisheries document. FISHERIES/2026/MAY/EIMTG/02: 3pp.

de Moor, C.L. A method to convert the hydroacoustic survey estimates of Small Pelagic biomass from a March 2026 survey to equivalent biomasses that might have been surveyed in November 2025, for use in 2026 fisheries management advice. DFFE Branch Fisheries document. FISHERIES/2026/APR/SWG-PEL/14: 12pp.

de Moor, C.L. Projections of the sardine population using an operating model which does not estimate stock-recruitment relationships during conditioning. DFFE Branch Fisheries document. FISHERIES/2026/MAY/SWG-PEL/19: 28pp.

de Moor, C.L. Estimating total sardine recruitment and proportions by stock and coast: considering additional prior distributions. DFFE Branch Fisheries document. FISHERIES/2026/MAY/SWG-PEL/20rev: 28pp.

de Moor, C.L. Initial results for a Sardine-only Management Strategy Evaluation (MSE). DFFE Branch Fisheries document. FISHERIES/2026/JUN/SWG-PEL/21rev: 40pp.

de Moor, C.L. An outline of a short-term option to measure candidate Sardine-only Management Procedures against ecosystem objectives. DFFE Branch Fisheries document. FISHERIES/2026/JUN/SWG-PEL/EIMTG/06: 2pp.

de Moor, C.L. A first attempt at incorporating a predator need threshold in the sardine MSE performance statistics. DFFE Branch Fisheries document. FISHERIES/2026/JUL/SWG-PEL/EIMTG/08: 3pp.

de Moor, C. L, Shannon, L.J. and Cochrane, K. Exploring the use of production leftover after consumption as a possible sardine MSE performance statistic measuring ecosystem objectives. DFFE Branch Fisheries document. FISHERIES/2026/JUL/SWG-PEL/EIMTG/09: 3pp.

de Moor, C.L. Applying the method to convert delayed hydroacoustic survey estimates of sardine to 1+ biomass only. DFFE Branch Fisheries document. FISHERIES/2026/JUN/SWG-PEL/25: 4pp.

de Moor, C.L. An operating model for the Management Strategy Evaluation (MSE) to develop a Sardine-only Management Procedure. DFFE Branch Fisheries document. FISHERIES/2026/JUL/SWG-PEL/22: 11pp.

de Moor, C.L. Sardine projections assuming a Beverton Holt stock recruitment relationship and a range of simple Candidate Management Procedures. DFFE Branch Fisheries document. FISHERIES/2026/JUN/SWG-PEL/28: 5pp.

de Moor, C.L. Sardine projections assuming a ‘binning approach’ for future recruitment and a range of simple Candidate Management Procedures. DFFE Branch Fisheries document. FISHERIES/2026/JUL/SWG-PEL/30: 13pp.

de Moor, C.L. Sardine projections under a range of simple Cndidate Management Procedures and five different Operating Models. DFFE Branch Fisheries document. FISHERIES/2026/JUL/SWG-PEL/32rev: 19pp.

de Moor, C.L. A smaller set of simple Sardine-only Candidate Management Procedures with additional performance statistics. DFFE Branch Fisheries document. FISHERIES/2026/JUL/SWG-PEL/33rev: 17pp.

Johnston, S. and van der Heever, G. West coast rock lobster - further information to aid discussions regarding A3+4 low catches in the 2025/26 season. DFFE Branch Fisheries document. FISHERIES/2026/04/WCRL/01: 12 pp.

Johnston, S. Overall poaching time series for West Coast rock lobster as evaluated in 2026, resulting from combining estimates of illegally exported and locally sold lobsters with compliance time series. DFFE Branch Fisheries document. FISHERIES/2026/AUG/SWG/WCRL/11: 11pp.

Johnston, S. Updated assessments of the West Coast rock lobster resource for 2026. DFFE Branch Fisheries document. FISHERIES/2026/AUG/SWG/WCRL/13: 27pp.

Johnston, S. and Butterworth, D.S. Projections of West Coast rock lobster resource using the 2026 stock assessment. DFFE Branch Fisheries document. FISHERIES/2026/AUG/SWG/WCRL/14: 11pp.

Johnston, S. Brief summary of recreational information for West Coast rock lobster. DFFE Branch Fisheries document. FISHERIES/2026/AUG/SWG/WCRL/17: 18pp.

Johnston, S. and Butterworth, D.S. Key results on which to focus in developing TAC recommendation. DFFE Branch Fisheries document. FISHERIES/2026/AUG/SWG/WCRL/18: 3pp.

Johnston, S. and Butterworth, D.S. Updated 2026 South Coast rock lobster assessment and projections. DFFE Branch Fisheries document. FISHERIES/2026/AUG/SWG/SCRL/05: 19pp.

Ross-Gillespie, A. and Butterworth, D.S. Summarised set of round herring results to aid the setting of the 2026 PUCL. DFFE Branch Fisheries document. FISHERIES/2026/FEB/SWG-PEL/05: 9pp.

Butterworth, D.S. Navigating sustainability — Doug Butterworth on SA’s fishing industry challenges. Daily Maverick, 18 January 2026: 3pp