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Browsing by Author "Coetzee, Janet"

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Basis suggested, following task group discussions, for determining the 2019 sardine directed TAC and by-catch TAB

Author: Butterworth, Doug S ; Coetzee, Janet Date: 2019 A list is put forward of suggestions and criteria to provide a basis for developing a sardine directed TAC and by-catch TAB for 2019 Read more
Calculating an informative prior distribution for the bias of hydro‐acoustic survey estimates of the biomass of the South African anchovy

Author: de Moor, Carryn ; Coetzee, Janet ; Butterworth, Doug Date: 2020 A prior distribution for the bias of the hydro‐acoustic survey estimates of the biomass of the South African anchovy is developed by considering the bias associated with the individual sources of error. Read more
The data used in the 2019 sardine assessment.

Author: de Moor, Carryn ; Merkle, Dagmar ; Coetzee, Janet ; van der Lingen, Carl Date: 2019 Data to which the 2019 assessment of the South African sardine resource is to be conditioned are listed Read more
Density dependent movement of South African sardine

Author: de Moor, Carryn ; Bergh, Mike ; Butterworth, Doug S ; Coetzee, Janet ; van der Lingen, Carl Date: Mar 2018 A hypothesis that the movement of South Africa sardine from the west to the south coast is dependent on west coast biomass is revisited and a relationship proposed for use in future projections. Read more
Developing informative prior distributions for the bias of hydro-acoustic survey estimates of the biomass of the South African round herring population

Author: de Moor, Carryn ; Coetzee, Janet ; Butterworth, Douglas Date: 2022 Prior distributions for the bias of the hydro‐acoustic survey estimates of the biomass of the South African round herring are developed by considering the bias associated with the individual sources of error Read more
Proposal for an interim initial anchovy TAC for 2020

Author: de Moor, Carryn ; Coetzee, Janet Date: 2019 As only part of the small pelagic hydroacoustic survey has been analysed thus far, an interim initial anchovy TAC is proposed to enable the 2020 anchovy fishing season to begin timeously. Read more
Summary of issues pertinent to a decision on possible adjustment of the maximum directed sardine catch allowance west of Agulhas for 2016

Author: Coetzee, Janet ; Butterworth, Douglas ; van der Lingen, Carl ; de Moor, Carryn Date: 2016 This paper summarises proposals on the many and varied issues that need to be addressed in reaching a decision on a possible increase in the maximum directed sardine catch that may be taken west of Cape Agulhas during 2016. It also includes ... Read more
A summary of the method used to provide 2019 catch limit advice for South African sardine

Author: de Moor, Carryn ; Coetzee, Janet Date: 2019 Following the declaration of Exceptional Circumstances for sardine, a TAC and TABs for sardine for 2019 were recommended based on short-term projections rather than on OMP-18. The methods used to obtain those projections are described. The ... Read more
A summary of the South African sardine (and anchovy) fishery

Author: Coetzee, Janet ; de Moor, Carryn ; Butterworth, Doug S Date: Nov 2018 The sardine fishery is an important component of the South African purse-seine fishery, the largest commercial fishery in South Africa (by landed mass). This fishery, initially established on the West Coast, but with some subsequent infrastructure ... Read more
Uncertainties and associated concerns relating to using short-term projections to advise on the 2020 sardine TAC and TABs

Author: de Moor, Carryn ; Coetzee, Janet ; Butterworth, Doug S Date: 2019 The analyses undertaken to provide a scientific recommendation for the 2019 sardine TAC and TAB, under Exceptional Circumstances were subject to a number of more serious uncertainties than would normally apply. Given the critically low level ... Read more