Browsing by Subject "TAC"

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    Draft proposed procedures for deviating from the west coast rock lobster OMP output for the recommendation for a TAC, and for initiating an OMP review, together with procedures for within-review scheduling
    (2005) Butterworth, Doug S
    The first and major part of this document is an adaptation of an extract from the specification document for a Management Procedure (OMP-equivalent) for Southern Bluefin Tuna by the Commission for the Conservation of Southern Bluefin Tuna (CCSBT). The adaptation here, though worded primarily with west coast rock lobster in mind, is put forward also in a more general context, viz. serving as a template for any South African fishery for which an OMP might be used to provide scientific recommendations for management (mainly by way of a recommended TAC). Hence in certain sections that are more species-specific, wording that might be used for other resources is also provided in italicised parentheses. The document concludes with parallels drawn from procedures adopted by the Scientific Committee of the International Whaling Commission in regard to the scheduling of milestones within an OMP development or review process.
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    Effect of missing values from the Canadian spring and fall surveys of NAFO Divisions 3LNO on the calculation of the TAC using the Greenland halibut HCR
    (2022) Regular, P M; Butterworth, Douglas; Rademeyer, Rebecca
    To test the impact of ignoring recent missing abundance indices for Greenland Halibut in NAFO divisions 2+3KLMNO on applying the accepted HCR for this population to provide a TAC recommendation for 2023, the impact of similar exclusions in the past is examined and found to be small. To further test of the impact of the missing 2021 index from the Canada Fall 3LNO survey, a range of pessimistic to optimistic abundance index values were assumed to assess the plausible range of impact this one value might have on the TAC computation. The range of the resultant TACs is small, and the difference of the impact of TACs at either end of this range on exploitable biomass projections for the next year is found to be negligible. Hence, it is argued, the minimalist and straightforward approach of simply ignoring the missing 2021 Canadian Fall 3LNO result in the four-survey version of the HCR agreed last year would be a defensible and appropriate approach to the required adjustment of the implementation of this HCR to provide a TAC recommendation for 2023.
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    Summary of issues pertinent to a decision on possible adjustment of the maximum directed sardine catch allowance west of Agulhas for 2016
    (2016) Coetzee, Janet; Butterworth, Douglas; van der Lingen, Carl; de Moor, Carryn
    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 a list of associated issues on which further information is required, both for the short and the longer term.