The 2007 age-structured production model assessments and projections for the South Coast rock lobster resource-routine update using Pope's approximation model fitting to catch-at-age data including scenarios for time-varying selectivity
dc.contributor.author | Johnston, Susan J | |
dc.contributor.author | Butterworth, Doug S | |
dc.date.accessioned | 2016-04-26T11:33:47Z | |
dc.date.available | 2016-04-26T11:33:47Z | |
dc.date.issued | 2007 | |
dc.date.updated | 2016-04-26T11:31:46Z | |
dc.description.abstract | The assessment conducted in 2006 (WG/06/06/WCRL3) has been routinely extended (except that the Baranov equation has been replaced by Pope’s approximation), taking account of a further year’s catch, CPUE and catch-at-age data. The observed CPUE shows a slight decrease for 2005 (2005/06 season). The sustainable yield estimates are generally very similar to those for the 2006 assessment, although estimates of current biomass levels relative to K increase. The Reference Case (RC) scenario suggests that a TAC of a little less than 330 MT or less would be appropriate to prevent biomass decline in the future. The other four scenarios reported suggest higher values than this, ranging from 350 MT to 405 MT. Spawning biomass trends over the last 10 years are downward for all the models considered. | en_ZA |
dc.identifier.apacitation | Johnston, S. J., & Butterworth, D. S. (2007). <i>The 2007 age-structured production model assessments and projections for the South Coast rock lobster resource-routine update using Pope's approximation model fitting to catch-at-age data including scenarios for time-varying selectivity</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/19223 | en_ZA |
dc.identifier.chicagocitation | Johnston, Susan J, and Doug S Butterworth <i>The 2007 age-structured production model assessments and projections for the South Coast rock lobster resource-routine update using Pope's approximation model fitting to catch-at-age data including scenarios for time-varying selectivity.</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2007. http://hdl.handle.net/11427/19223 | en_ZA |
dc.identifier.citation | Johnston, S. J., & Butterworth, D. S. (2007). The 2007 age-structured production model assessments and projections for the South Coast rock lobster resource-routine update using Pope's approximation model fitting to catch-at-age data including scenarios for time-varying selectivity. Marine and Coastal Management document. WG/08/07/SCL | en_ZA |
dc.identifier.ris | TY - Working Paper AU - Johnston, Susan J AU - Butterworth, Doug S AB - The assessment conducted in 2006 (WG/06/06/WCRL3) has been routinely extended (except that the Baranov equation has been replaced by Pope’s approximation), taking account of a further year’s catch, CPUE and catch-at-age data. The observed CPUE shows a slight decrease for 2005 (2005/06 season). The sustainable yield estimates are generally very similar to those for the 2006 assessment, although estimates of current biomass levels relative to K increase. The Reference Case (RC) scenario suggests that a TAC of a little less than 330 MT or less would be appropriate to prevent biomass decline in the future. The other four scenarios reported suggest higher values than this, ranging from 350 MT to 405 MT. Spawning biomass trends over the last 10 years are downward for all the models considered. DA - 2007 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2007 T1 - The 2007 age-structured production model assessments and projections for the South Coast rock lobster resource-routine update using Pope's approximation model fitting to catch-at-age data including scenarios for time-varying selectivity TI - The 2007 age-structured production model assessments and projections for the South Coast rock lobster resource-routine update using Pope's approximation model fitting to catch-at-age data including scenarios for time-varying selectivity UR - http://hdl.handle.net/11427/19223 ER - | en_ZA |
dc.identifier.uri | http://hdl.handle.net/11427/19223 | |
dc.identifier.vancouvercitation | Johnston SJ, Butterworth DS. The 2007 age-structured production model assessments and projections for the South Coast rock lobster resource-routine update using Pope's approximation model fitting to catch-at-age data including scenarios for time-varying selectivity. 2007 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/19223 | 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 | age-structured production model | |
dc.subject.other | assessments | |
dc.subject.other | South Coast rock lobster resource | |
dc.subject.other | Pope's approximation model | |
dc.title | The 2007 age-structured production model assessments and projections for the South Coast rock lobster resource-routine update using Pope's approximation model fitting to catch-at-age data including scenarios for time-varying selectivity | en_ZA |
dc.type | Working Paper | en_ZA |
uct.type.filetype | Text | |
uct.type.publication | Research | en_ZA |
uct.type.resource | Research paper | en_ZA |