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- ItemOpen Access2018 GLMM-standardised Tristan lobster CPUE compared with the current OMP target levels (Itar)(2018-05) Johnston, Susan; Butterworth, Doug SThis document reports the 2018 GLMM-standardised Tristan lobster CPUE compared with the current OMP target levels that are in place for each island.
- ItemOpen AccessThe 2018 Operation Management Procedure for the South African Merluccius paradoxus and M. capensis Resources(2019) Ross-Gillespie, Andrea; Butterworth, Doug S; Glazer, Jean; Fairweather, TraceySpecifications and projection results for the 2018 Operational Management Procedure used for setting South African hake Total Allowable Catches are provided along with various background information, including details of the metarule processes.
- ItemOpen AccessThe 2018 Operational Management Procedure for the South African Merluccius paradoxus and M. capensis resources.(2018-10) Ross-Gillespie, Andrea; Butterworth, Doug S; Glazer, Jean; Fairweather, TraceySpecifications and projection results for the 2018 OMP used for setting SA hake TACs are provided along with various background information, including details of the metarule process.
- ItemOpen AccessThe 2018 Operational Management Procedure for the South African sardine and anchovy resources(2018) de Moor, CarrynThe Operational Management Procedure (OMP) to be used to recommend total allowable catches and bycatches for sardine and anchovy in South African waters has been updated and is detailed herein
- ItemOpen AccessThe 2018 south coast rock lobster reference case operating model(2019) Johnston, Susan; Butterworth, Doug SThis document details the current 2018 Reference Case Operating Model which is to be proposed to be used for simulation testing of a new OMP for South Coast rock lobster.
- ItemOpen Access2018 Updated horse mackerel assessments(2018-10) Johnston, Susan; Butterworth, Doug SThe assessments for the two hypotheses (reduced catchability and a one-off additional mortality event) for the recent reduced Desert Diamond catch rate are updated to take one further year’s data into account. The 2017 CPUE somewhat increased above its 2016 value, and now almost returned to the values typical before the 2014 low. If the same basis as in the recent past is used to make management recommendations with an unchanged effort limitation, the total allowable midwater catch would be set at 23 851 MT. However the assessment results, given this data update, are suggestive of the catchability hypothesis now being more plausible than the additional mortality hypothesis. This in turn suggests that consideration should be given to some increase in the cap on effort, which would lead to a concomitant increase in the midwater TAC.
- ItemOpen Access2018 updated south coast rock lobster assessment results(2019) Johnston, Susan; Butterworth, Doug SThe 2017 assessment of the resource for South Coast rock lobster is updated given the two further years of catch-at-length data and one further year of CPUE data now available. Recruitment is estimated to have decreased over the last two seasons for which this is now estimable (2007 and 2008). The spawning biomass trajectory decreases slightly over recent years. Current spawning biomass is estimated to be 29% of K. The Reference Case (RC) MSY estimate is 358 MT at a Bsp/K of 0.29. Fmsy is estimated to be 0.29, though MSY-related estimates are heavily dependent on assumptions made about the stock-recruitment relationship. The RC model estimates that the resource is currently at Bmsy.
- ItemOpen Access2018 updated west coast rock lobster assessments(2018-11) Johnston, Susan; Butterworth, Doug SA new set of 2018 assessments for all five super-areas for the west coast rock lobster resource has recently been completed. These provide the bases for projecting the resource forwards (in each super-area) under alternative future catches to in turn provide a basis for management advice, as is reported in MARAM/IWS/2018/WCRL/P4. Limitations of the analysis are also discussed.
- ItemOpen Access2020 sole dynamic Schaefer production model results(2020) Glazer, Jean; Butterworth, DougThe sole resource is modelled by a dynamic Schaefer production model which allows for a drop in the value of the intrinsic growth rate parameter from 2000 onwards. The model is fit to the available CPUE and survey abundance indices. These data are not sufficiently informative to be able to distinguish amongst fairly wide ranges of pre- and post-2000 intrinsic growth rate parameters. Nevertheless, all suggest that the sole resource has never been substantially depleted (being well above its MSY level), and furthermore that the current replacement yield and MSY are reasonably robustly estimated in the ranges of 275-350 and 490-720 mt respectively. Given that this update 2020 assessment indicates slightly lower values for resource productivity than in 2019, consideration should be given to some reduction in the current TAC of 502 mt.
- ItemMetadata onlyA case study of water sources and water quality of the Chalumna/Hamburg area of Ciskei(Southern Africa Labour and Development Research Unit, 2015-05-28) Stone, A.
- ItemMetadata onlyA community health project for the aged in Grassy Park/Lotus River: An assessment and guidelines for the future(Southern Africa Labour and Development Research Unit, 2015-05-28) Isaacs, S.
- ItemMetadata onlyA community in bondage: A case study(Southern Africa Labour and Development Research Unit, 2015-05-28) Gonsalves, M.M.
- ItemOpen AccessA comparative study of the access to and use of electricity by farmworker households in the Free-State(1996) Hofmeyer, Iilne-Mari
- ItemMetadata onlyA comparison of domestic water use between black and white communities in the Eastern Cape(Southern Africa Labour and Development Research Unit, 2015-05-28) Stone, A.
- ItemMetadata onlyA critical analysis of the issues of Reinstatement, specific performance and victimisation in the field of labour law(Southern Africa Labour and Development Research Unit, 2015-05-28) Turner, G.
- ItemMetadata onlyA critique of poverty datum lines(Southern Africa Labour and Development Research Unit, 2015-05-28) Budlender, D.
- ItemMetadata onlyA description of income, expenditure and earnings patterns from households in Cape Town and Durban(Southern Africa Labour and Development Research Unit, 2015-05-28) Prinsloo, J.B.
- ItemOpen AccessA development framework for rural electrification: Some preliminary findings(1997) Thom, Cecile
- ItemOpen AccessA financial and economic analysis of two electrification projects(1997) Davis, Mark
- ItemMetadata onlyA fly in the ointment: Productivity growth, job loss and the NPI(Southern Africa Labour and Development Research Unit, 2015-05-28) Meth, C.