Final updated 2019 assessments and projections of west coast rock lobster for different poaching scenarios

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dc.contributor.authorJohnston, Susan
dc.contributor.authorButterworth, Doug S
dc.date.accessioned2020-08-24T06:58:07Z
dc.date.available2020-08-24T06:58:07Z
dc.date.issued2019
dc.description.abstractThe 2018 assessments and projections for the five super-areas for the west coast rock lobster resource are updated to 2019, using basically the same approach as in 2018. The update takes account of a further year’s catch and resource monitoring data, uses improved recruitment and projection methodologies, and incorporates major revisions of estimates of past poaching levels following extensive further examination of the associated data. There is clear evidence that quantity of lobsters poached has dropped from the 2017/18 to the 2018/19 season. Projections are developed on an identical basis to that used in 2018, with the results for three options shown for two different assumptions about the historical poaching trend. These are that future legal catches are set to zero, that they are set so that the abundance of the whole resource is equal (in median terms) to that in the 2006 benchmark year by the time the 2025 target year is reached, and hallway between these two options (in 2018 the WCRL SWG’s TAC recommendations were based on the third of these three options), The key projection results are listed in Table 1, with graphical representations provided in Figure 1. These reflect an improvement compared to the situation a year previously, with very little difference for the two historical poaching scenarios considereden_US
dc.identifier.apacitationJohnston, S., & Butterworth, D. (2019). <i>Final updated 2019 assessments and projections of west coast rock lobster for different poaching scenarios</i> ,Faculty of Science ,Department of Mathematics and Applied Mathematics. Retrieved from http://hdl.handle.net/11427/32116en_ZA
dc.identifier.chicagocitationJohnston, Susan, and Doug Butterworth <i>Final updated 2019 assessments and projections of west coast rock lobster for different poaching scenarios.</i> ,Faculty of Science ,Department of Mathematics and Applied Mathematics, 2019. http://hdl.handle.net/11427/32116en_ZA
dc.identifier.citationJohnston, S. & Butterworth, D. 2019. <i>Final updated 2019 assessments and projections of west coast rock lobster for different poaching scenarios</i>. ,Faculty of Science ,Department of Mathematics and Applied Mathematics. http://hdl.handle.net/11427/32116 .en_ZA
dc.identifier.ris TY - Report AU - Johnston, Susan AU - Butterworth, Doug AB - The 2018 assessments and projections for the five super-areas for the west coast rock lobster resource are updated to 2019, using basically the same approach as in 2018. The update takes account of a further year’s catch and resource monitoring data, uses improved recruitment and projection methodologies, and incorporates major revisions of estimates of past poaching levels following extensive further examination of the associated data. There is clear evidence that quantity of lobsters poached has dropped from the 2017/18 to the 2018/19 season. Projections are developed on an identical basis to that used in 2018, with the results for three options shown for two different assumptions about the historical poaching trend. These are that future legal catches are set to zero, that they are set so that the abundance of the whole resource is equal (in median terms) to that in the 2006 benchmark year by the time the 2025 target year is reached, and hallway between these two options (in 2018 the WCRL SWG’s TAC recommendations were based on the third of these three options), The key projection results are listed in Table 1, with graphical representations provided in Figure 1. These reflect an improvement compared to the situation a year previously, with very little difference for the two historical poaching scenarios considered DA - 2019 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PY - 2019 T1 - Final updated 2019 assessments and projections of west coast rock lobster for different poaching scenarios TI - Final updated 2019 assessments and projections of west coast rock lobster for different poaching scenarios UR - http://hdl.handle.net/11427/32116 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/32116
dc.identifier.vancouvercitationJohnston S, Butterworth D. Final updated 2019 assessments and projections of west coast rock lobster for different poaching scenarios. 2019 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/32116en_ZA
dc.publisher.departmentDepartment of Mathematics and Applied Mathematicsen_US
dc.publisher.facultyFaculty of Scienceen_US
dc.titleFinal updated 2019 assessments and projections of west coast rock lobster for different poaching scenariosen_US
dc.typeReporten_US
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