Stochastic projections for the 2019 assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity

Simple item page
dc.contributor.authorBrandão, Anabela
dc.contributor.authorButterworth, Doug S
dc.date.accessioned2020-01-20T06:56:16Z
dc.date.available2020-01-20T06:56:16Z
dc.date.issued2019
dc.description.abstractFor stochastic future recruitment and for annual catch levels of 0, 200 and 400 tonnes, the median of the spawning biomass estimates for the New Base case model drops initially, but returns to its current level within a decade. For higher catch levels of 543 and 643 tonnes, the median of the spawning biomass estimates return to current levels within only 15 and 20 years respectively. However, for variants of this model that attempt to improve the fit to the trotline CPUE or which adjust the projected recruitments to reflect a possible regime shift, it is only annual catches of 200 tonnes that maintain the spawning biomass above its current level at the end of a 20 year period. This suggests that consideration should perhaps be given to recommending some decrease in the present annual TAC of 543 tonnes.en_US
dc.identifier.apacitationBrandão, A., & Butterworth, D. (2019). <i>Stochastic projections for the 2019 assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity</i> ,Faculty of Science ,Department of Mathematics and Applied Mathematics. Retrieved from http://hdl.handle.net/11427/30762en_ZA
dc.identifier.chicagocitationBrandão, Anabela, and Doug Butterworth <i>Stochastic projections for the 2019 assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity.</i> ,Faculty of Science ,Department of Mathematics and Applied Mathematics, 2019. http://hdl.handle.net/11427/30762en_ZA
dc.identifier.citationBrandão, A., Butterworth, D. 2019. Stochastic projections for the 2019 assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity.en_ZA
dc.identifier.ris TY - Report AU - Brandão, Anabela AU - Butterworth, Doug AB - For stochastic future recruitment and for annual catch levels of 0, 200 and 400 tonnes, the median of the spawning biomass estimates for the New Base case model drops initially, but returns to its current level within a decade. For higher catch levels of 543 and 643 tonnes, the median of the spawning biomass estimates return to current levels within only 15 and 20 years respectively. However, for variants of this model that attempt to improve the fit to the trotline CPUE or which adjust the projected recruitments to reflect a possible regime shift, it is only annual catches of 200 tonnes that maintain the spawning biomass above its current level at the end of a 20 year period. This suggests that consideration should perhaps be given to recommending some decrease in the present annual TAC of 543 tonnes. DA - 2019 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PY - 2019 T1 - Stochastic projections for the 2019 assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity TI - Stochastic projections for the 2019 assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity UR - http://hdl.handle.net/11427/30762 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/30762
dc.identifier.vancouvercitationBrandão A, Butterworth D. Stochastic projections for the 2019 assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity. 2019 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/30762en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Mathematics and Applied Mathematicsen_US
dc.publisher.facultyFaculty of Scienceen_US
dc.titleStochastic projections for the 2019 assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinityen_US
dc.typeReporten_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
FISHERIES_2019_OCT_SWG-DEM_33 Toothfish stochastic projections.pdf
Size:
396.23 KB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.72 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Reports