Assessment of the South African sardine resource using data from 1984-2015: Results at the joint posterior mode for the two mixing-stock hypothesis.
| dc.contributor.author | de Moor, C L | |
| dc.contributor.author | Butterworth, Doug S | |
| dc.date.accessioned | 2017-02-17T13:52:08Z | |
| dc.date.available | 2017-02-17T13:52:08Z | |
| dc.date.issued | 2016-07 | |
| dc.description.abstract | The Operating Model (OM) for the South African sardine resource has been updated from that used to develop OMP-14 given four more years of data. The model has been altered from previous assessments to now model infection of sardine by a “tetracotyle”-type metacercarian parasite, and includes data on this parasite prevalence-by-length in the likelihood. A Hockey-Stick stock recruitment relationship is used for this OM, with a different median recruitment and higher variability estimated for the west stock during “peak years”. Time-invariant natural mortality is assumed to be 1.0 year-1 for juveniles and 0.8 year-1 for adults as before. The total resource abundance is estimated to be 688 thousand tons in November 2015, with the west stock consisting of 142 thousand tons and the south stock consisting of 546 thousand tons. These biomasses are well below the long term average of 1 039 and 492 thousand tons for the total resource and west stock respectively, and near the long term average of 547 thousand tons for the south stock. The west stock has experienced below average recruitment in 11 out of the 12 most recent years. | en_ZA |
| dc.identifier.apacitation | de Moor, C. L., & Butterworth, D. S. (2016). <i>Assessment of the South African sardine resource using data from 1984-2015: Results at the joint posterior mode for the two mixing-stock hypothesis</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/23972 | en_ZA |
| dc.identifier.chicagocitation | de Moor, C L, and Doug S Butterworth <i>Assessment of the South African sardine resource using data from 1984-2015: Results at the joint posterior mode for the two mixing-stock hypothesis.</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2016. http://hdl.handle.net/11427/23972 | en_ZA |
| dc.identifier.citation | de Moor, C.L. and Butterworth, D.S. 2016. Assessment of the South African sardine resource using data from 1984-2015: Results at the joint posterior mode for the two mixing-stock hypothesis. DAFF Branch Fisheries document. FISHERIES/2016/JUL/SWG-PEL/22REV2: 43pp. | en_ZA |
| dc.identifier.ris | TY - Working Paper AU - de Moor, C L AU - Butterworth, Doug S AB - The Operating Model (OM) for the South African sardine resource has been updated from that used to develop OMP-14 given four more years of data. The model has been altered from previous assessments to now model infection of sardine by a “tetracotyle”-type metacercarian parasite, and includes data on this parasite prevalence-by-length in the likelihood. A Hockey-Stick stock recruitment relationship is used for this OM, with a different median recruitment and higher variability estimated for the west stock during “peak years”. Time-invariant natural mortality is assumed to be 1.0 year-1 for juveniles and 0.8 year-1 for adults as before. The total resource abundance is estimated to be 688 thousand tons in November 2015, with the west stock consisting of 142 thousand tons and the south stock consisting of 546 thousand tons. These biomasses are well below the long term average of 1 039 and 492 thousand tons for the total resource and west stock respectively, and near the long term average of 547 thousand tons for the south stock. The west stock has experienced below average recruitment in 11 out of the 12 most recent years. DA - 2016-07 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2016 T1 - Assessment of the South African sardine resource using data from 1984-2015: Results at the joint posterior mode for the two mixing-stock hypothesis TI - Assessment of the South African sardine resource using data from 1984-2015: Results at the joint posterior mode for the two mixing-stock hypothesis UR - http://hdl.handle.net/11427/23972 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/23972 | |
| dc.identifier.vancouvercitation | de Moor CL, Butterworth DS. Assessment of the South African sardine resource using data from 1984-2015: Results at the joint posterior mode for the two mixing-stock hypothesis. 2016 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/23972 | 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 sardine resource using data from 1984-2015: Results at the joint posterior mode for the two mixing-stock hypothesis. | 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 | Working paper | en_ZA |