Assessment of the South African anchovy resource using data from 1984-2009
| dc.contributor.author | De Moor, Carryn L | |
| dc.contributor.author | Butterworth, Doug S | |
| dc.date.accessioned | 2016-04-05T13:47:49Z | |
| dc.date.available | 2016-04-05T13:47:49Z | |
| dc.date.issued | 2010 | |
| dc.date.updated | 2016-04-05T13:43:58Z | |
| dc.description.abstract | The assessment of the South African anchovy resource has been updated given three more years of data and a revised time series of commercial catch. The base case hypothesis has the same juvenile and adult natural mortality rates as previous assessments, but a Beverton Holt stock recruitment relationship is now assumed instead of a hockey stick with fixed inflection point based on the AICc selection criterion. This change has resulted in a large increase in median posterior carrying capacity from previous assessments. There has been a decrease in recruitment residual standard deviation and in recruitment serial autocorrelation with the newer assessments. The impact of this on the appropriate choice of a risk definition and threshold for the new OMP to be developed next year will be considered early in the OMP development phase. The resource abundance remains above average, with a model-estimated 1+ biomass of 3.5 million tons in November 2009, and the resource has produced 8 years of above average recruitment in the past 11 years. The harvest proportion in the past 9 years has not exceeded 0.14. | en_ZA |
| dc.identifier.apacitation | De Moor, C. L., & Butterworth, D. S. (2010). <i>Assessment of the South African anchovy resource using data from 1984-2009</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/18633 | en_ZA |
| dc.identifier.chicagocitation | De Moor, Carryn L, and Doug S Butterworth <i>Assessment of the South African anchovy resource using data from 1984-2009.</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2010. http://hdl.handle.net/11427/18633 | en_ZA |
| dc.identifier.citation | de Moor, C. L., & Butterworth, D. S. (2010). Assessment of the South African anchovy resource using data from 1984-2009. MARAM: University of Cape Town. | en_ZA |
| dc.identifier.ris | TY - Working Paper AU - De Moor, Carryn L AU - Butterworth, Doug S AB - The assessment of the South African anchovy resource has been updated given three more years of data and a revised time series of commercial catch. The base case hypothesis has the same juvenile and adult natural mortality rates as previous assessments, but a Beverton Holt stock recruitment relationship is now assumed instead of a hockey stick with fixed inflection point based on the AICc selection criterion. This change has resulted in a large increase in median posterior carrying capacity from previous assessments. There has been a decrease in recruitment residual standard deviation and in recruitment serial autocorrelation with the newer assessments. The impact of this on the appropriate choice of a risk definition and threshold for the new OMP to be developed next year will be considered early in the OMP development phase. The resource abundance remains above average, with a model-estimated 1+ biomass of 3.5 million tons in November 2009, and the resource has produced 8 years of above average recruitment in the past 11 years. The harvest proportion in the past 9 years has not exceeded 0.14. DA - 2010 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2010 T1 - Assessment of the South African anchovy resource using data from 1984-2009 TI - Assessment of the South African anchovy resource using data from 1984-2009 UR - http://hdl.handle.net/11427/18633 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/18633 | |
| dc.identifier.vancouvercitation | De Moor CL, Butterworth DS. Assessment of the South African anchovy resource using data from 1984-2009. 2010 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18633 | en_ZA |
| dc.language | eng | en_ZA |
| dc.publisher.department | Marine Resource Assessment and Management Group | en_ZA |
| dc.publisher.faculty | Faculty of Science | en_ZA |
| dc.publisher.institution | University of Cape Town | |
| dc.title | Assessment of the South African anchovy resource using data from 1984-2009 | en_ZA |
| dc.type | Working Paper | en_ZA |
| uct.type.filetype | Text | |
| uct.type.filetype | Image | |
| uct.type.publication | Research | en_ZA |
| uct.type.resource | Research paper | en_ZA |