Preliminary assessment of the western and south-western Cape Carpenter resource using an age-structured production model
| dc.contributor.author | Geromont, Helena F | |
| dc.contributor.author | Butterworth, Doug S | |
| dc.date.accessioned | 2016-03-08T15:09:02Z | |
| dc.date.available | 2016-03-08T15:09:02Z | |
| dc.date.issued | 2011 | |
| dc.date.updated | 2016-03-08T10:35:24Z | |
| dc.description.abstract | An age-structured production model (ASPM) is used to assess the Carpenter resource off the south western coast of South Africa. The model is fitted to standardized CPUE and length frequency linefish data. Problems encountered when attempting to fit the model to these data are explored. Reasons may include conflicting data, or complexities in the resource dynamics that are not incorporated in the simple density-dependent ASPM dynamics. Plausible parameter estimates are only achieved when fixing or imposing penalty functions for key parameters. However, this leads to deterioration in the fit to the data with systematic trends in the residuals which render results suspect and management advice based on such assessments dubious. Indeed, a management procedure approach may be better suited to circumstances when a “best assessment” is problematic, as seems to be the case here. | en_ZA |
| dc.identifier.apacitation | Geromont, H. F., & Butterworth, D. S. (2011). <i>Preliminary assessment of the western and south-western Cape Carpenter resource using an age-structured production model</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/17584 | en_ZA |
| dc.identifier.chicagocitation | Geromont, Helena F, and Doug S Butterworth <i>Preliminary assessment of the western and south-western Cape Carpenter resource using an age-structured production model.</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2011. http://hdl.handle.net/11427/17584 | en_ZA |
| dc.identifier.citation | Geromont, H.F, Butterworth , D. S., (2011). Preliminary assessment of the western and south-western Cape Carpenter resource using an age-structured production model. MARAM, University of Cape Town. | en_ZA |
| dc.identifier.ris | TY - Working Paper AU - Geromont, Helena F AU - Butterworth, Doug S AB - An age-structured production model (ASPM) is used to assess the Carpenter resource off the south western coast of South Africa. The model is fitted to standardized CPUE and length frequency linefish data. Problems encountered when attempting to fit the model to these data are explored. Reasons may include conflicting data, or complexities in the resource dynamics that are not incorporated in the simple density-dependent ASPM dynamics. Plausible parameter estimates are only achieved when fixing or imposing penalty functions for key parameters. However, this leads to deterioration in the fit to the data with systematic trends in the residuals which render results suspect and management advice based on such assessments dubious. Indeed, a management procedure approach may be better suited to circumstances when a “best assessment” is problematic, as seems to be the case here. DA - 2011 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2011 T1 - Preliminary assessment of the western and south-western Cape Carpenter resource using an age-structured production model TI - Preliminary assessment of the western and south-western Cape Carpenter resource using an age-structured production model UR - http://hdl.handle.net/11427/17584 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/17584 | |
| dc.identifier.vancouvercitation | Geromont HF, Butterworth DS. Preliminary assessment of the western and south-western Cape Carpenter resource using an age-structured production model. 2011 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17584 | 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.subject.other | MARAM, University of Cape Town | |
| dc.title | Preliminary assessment of the western and south-western Cape Carpenter resource using an age-structured production model | 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 |