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Browsing by Author "Brandão, Anabela"

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Estimates of demographic parameters for southern right whales off South Africa from survey data from 1979 to 2006

Author: Brandão, Anabela ; Best, Peter B ; Butterworth, Doug S Date: 2010 Aerial counts of right whale cow-calf pairs on the south coast of South Africa between 1971 and 2006 indicate an annual instantaneous population increase rate of 0.069 a year (95% CI 0.064, 0.074). Annual photographic surveys since 1979 have ... Read more
An evaluation on four potential SLAs for West Greenland bowhead whales using the agreed evaluation and robustness trials

Author: Brandão, Anabela ; Butterworth, Doug S Date: 2013 This paper provides results from the application of the software developed by Andre Punt for the West bowhead whale trials as agreed at the AWMP Intersessional Workshop (IWC, 2014) to four potential SLAs. To facilitate comparison across ... Read more
An evaluation on four potential SLAs for West Greenland humpback and bowhead whales using the agreed evaluation and robustness trials

Author: Brandão, Anabela ; Butterworth, Doug S Date: 2013 In what is an initial analysis, four possible SLAs are run for the evaluation and robustness trials developed at the Fourth AWMP Workshop for West Greenland humpbacks and bowhead whales. A simple integrative approach to provide a ready coarse ... Read more
An evaluation on four potential SLAs for West Greenland humpback whales using the agreed evaluation and robustness trials

Author: Brandão, Anabela ; Butterworth, Doug S Date: 2014 This paper provides results from the application of the software developed by Andre Punt for the West humpback whale trials as agreed at the AWMP Intersessional Workshop (IWC, 2014) to four potential SLAs. To facilitate comparison across ... Read more
An evaluation on four potential SLAs for West Greenland humpback whales using the agreed evaluation and robustness trials

Author: Brandão, Anabela ; Butterworth, Doug S Date: 2014 This paper provides results from the application of the software developed by Andre Punt for the West humpback whale trials as agreed at the AWMP Intersessional Workshop (IWC, 2014) to four potential SLAs. To facilitate comparison across ... Read more
Extension of the development of a management procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity

Author: Brandão, Anabela ; Butterworth, Doug S Date: 2007 Three Operating Models (OMs) reflecting an “Optimistic”, “Intermediate” and a “Pessimistic” current status for the toothfish resource in the Prince Edward Islands region are developed which take account of the different selectivities of past ... Read more
FIMS indices for the rock lobster resource of South Africa: updated to include the 2009/2010 season

Author: Brandão, Anabela ; Butterworth, Doug S Date: 2010 In this paper the FIMS analysis reported in Brandão and Butterworth (2009) to obtain relative abundance indices for rock lobster is updated to include FIMS data for the 2009/10 season. Read more
FIMS length composition and percentage of females of the west coast rock lobster resource of South Africa

Author: Brandão, Anabela ; Butterworth, Doug S Date: 2010 Length frequency distributions obtained from the FIMS of the west coast rock lobster constitute one of data inputs into the assessment as well as an estimate of the percentage of females. The length composition of the catch for each station ... Read more
Final results for the abalone spatial- and age-structured assessment model for Zones A, B, C and D in 2013

Author: Brandão, Anabela ; Butterworth, Doug S Date: 2013 The 2012 assessment of abalone in Zones A-D is updated to include new data and modified to take the standard error of the estimated poaching trend into account. Projections are shown for different scenarios for the future commercial and ... Read more
Final results for the abalone spatial- and age-structured assessment model for Zones A, B, C and D in 2013

Author: Brandão, Anabela ; Butterworth, Doug S Date: 2013 The 2012 assessment of abalone in Zones A-D is updated to include new data and modified to take the standard error of the estimated poaching trend into account. Projections are shown for different scenarios for the future commercial and ... Read more
Final standardised CPUE series for toothfish (Dissostichus eleginoides) in the Prince Edward Islands EEZ to be used as input for the assessment

Author: Brandão, Anabela ; Butterworth, Doug S Date: 2014 GLMM standardisations of longline and trotline toothfish CPUE data are presented based on a “fishing” year rather than a calendar year. Possible relationships between average depth of sets and CPUE are investigated but no discernable differences ... Read more
Further analysis of tagging data of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands region

Author: Brandão, Anabela ; Butterworth, Doug Date: Aug 2018 Analyses of the tag-recapture data available for the PEI toothfish resource are undertaken to evaluate a vessel effect and an area effect on tag recovery rates as well as to determine a possible difference in tagging “success” between the two ... Read more
Further potential SLAs for West Greenland bowhead whales testing against the agreed evaluation trials

Author: Brandão, Anabela ; Butterworth, Doug S Date: 2015 This paper presents improved variants of the SLAs for which results were reported at the 2014 Scientific Committee meeting in Bled. Candidates are presented ranging from complete satisfaction of the conservation performance criterion for the ... Read more
Further projections assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2013, including tag-recapture data

Author: Brandão, Anabela ; Butterworth, Doug S Date: 2014 Further projections suggest that the resource would increase slowly under constant annual future catches of 500 t and for all but one of the sensitivity tests, a TAC of 600 t would still result in a slowly increasing resource. Read more
Further projections for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity

Author: Brandão, Anabela ; Butterworth, Doug S Date: Oct 2016 For stochastic future recruitment and for annual catch levels of both 575 tons (the present TAC) and 700 tons, the median of the spawning biomass estimates drops initially, but returns to its current level within a decade, while the exploitable ... Read more c b
Further results and sensitivity tests for the Reference-case abalone spatial- and age-structured assessment model for Zones A, B, C and D

Author: Brandão, Anabela ; Butterworth, Doug S Date: 2009 This paper reports on results for the Reference-case model (when the updated and extrapolated “old” CPUE series is used in the model fitting procedure) that were requested as well as results for two sensitivity tests. Details of the Reference-case ... Read more
Further results for lower confidence limits for the abundance of West Greenland minke whales

Author: Brandão, Anabela ; Butterworth, Doug S Date: 2009 The methodology advanced by Brandão and Butterworth (2007 and 2008) for simulating catch sex sampling data in the process of computing lower confidence bounds for the abundance of the West Greenland minke whale population is applied to the ... Read more
Further results for the standardisation of the CPUE series for toothfish (Dissostichus eleginoides) in the Prince Edward Islands EEZ using finer scale fishing areas

Author: Brandão, Anabela ; Butterworth, Doug S Date: 2014 Updated standardisation options are presented to account for the change in the vessels operating in the fishery after 2008, and the month effect is investigated as it may provide a useful basis to assist quantify the extent of cetacean depredation. Read more
Further results from an AWMPlite-like assessment of the West Greenland minke whale population

Author: Brandão, Anabela ; Butterworth, Doug S Date: 2007 The method advanced in Brandão and Butterworth (2006) to estimate a lower confidence limit on the size of the West Greenland minke whale population by taking account of the continuing sex bias in the catch is modified slightly and applied to ... Read more
Further results when interactions between the presence of observer and month are taken into account for steel vessels

Author: Somhlaba, S ; Brandão, Anabela ; Butterworth, Doug S Date: 2005 Interactions between the presence of an observer and month are investigated for both anchovy and sardine fisheries. The aim is to ascertain whether the effect of the presence of an observer still remains significant after these interactions ... Read more

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