A Bayesian assessment of the South Atlantic population of albacore which explicitly models changes in targeting
| dc.contributor.author | Rademeyer, Rebecca A | |
| dc.contributor.author | Butterworth, Doug S | |
| dc.contributor.author | Penney, Andrew J | |
| dc.date.accessioned | 2016-03-14T09:09:27Z | |
| dc.date.available | 2016-03-14T09:09:27Z | |
| dc.date.issued | 2004 | |
| dc.date.updated | 2016-03-14T08:40:07Z | |
| dc.description.abstract | The primary assessment method applied to South Atlantic albacore during the October 2000 ICCAT SCRS assessment session was an age-structured production model which assumed a fleet-aggregated selectivity pattern with a single change only (in 1969), and estimated model parameters using only CPUE data. A particular problem of this approach is that the Japan CPUE series is not considered comparable over the complete period for which it is available because of changed targeting practices, so that this series needs to be split into three separate segments when estimating model parameters. This paper refines that 2000 assessment by treating the Japanese, Taiwanese and Brazilian fisheries all as initially primarily albacore directed fisheries which have shifted over time to bigeye tuna targeted fisheries, taking albacore as a decreasing bycatch. The transitions over time are explicitly estimated, as are separate selectivities for the two components of each national fishery by also including catch-at-age information in the data fitted by the model. Compared to the high levels of uncertainty in past assessments, the refined model provides a reasonable to good fit to all available information, and suggests that the productivity of the resource is somewhat higher than estimated previously. | en_ZA |
| dc.identifier.apacitation | Rademeyer, R. A., Butterworth, D. S., & Penney, A. J. (2004). A Bayesian assessment of the South Atlantic population of albacore which explicitly models changes in targeting. <i>Collective Volume of Scientific Papers</i>, http://hdl.handle.net/11427/17753 | en_ZA |
| dc.identifier.chicagocitation | Rademeyer, Rebecca A, Doug S Butterworth, and Andrew J Penney "A Bayesian assessment of the South Atlantic population of albacore which explicitly models changes in targeting." <i>Collective Volume of Scientific Papers</i> (2004) http://hdl.handle.net/11427/17753 | en_ZA |
| dc.identifier.citation | Rademeyer, R. A., Butterworth, D. S., & Penney, A. J. (2004). A Bayesian Assessment of the South Atlantic population of albacore which explicitly models changes in targeting. Collect. Vol. Sci. Pap. ICCAT, 56(4), 1360-1390. | en_ZA |
| dc.identifier.ris | TY - Journal Article AU - Rademeyer, Rebecca A AU - Butterworth, Doug S AU - Penney, Andrew J AB - The primary assessment method applied to South Atlantic albacore during the October 2000 ICCAT SCRS assessment session was an age-structured production model which assumed a fleet-aggregated selectivity pattern with a single change only (in 1969), and estimated model parameters using only CPUE data. A particular problem of this approach is that the Japan CPUE series is not considered comparable over the complete period for which it is available because of changed targeting practices, so that this series needs to be split into three separate segments when estimating model parameters. This paper refines that 2000 assessment by treating the Japanese, Taiwanese and Brazilian fisheries all as initially primarily albacore directed fisheries which have shifted over time to bigeye tuna targeted fisheries, taking albacore as a decreasing bycatch. The transitions over time are explicitly estimated, as are separate selectivities for the two components of each national fishery by also including catch-at-age information in the data fitted by the model. Compared to the high levels of uncertainty in past assessments, the refined model provides a reasonable to good fit to all available information, and suggests that the productivity of the resource is somewhat higher than estimated previously. DA - 2004 DB - OpenUCT DP - University of Cape Town J1 - Collective Volume of Scientific Papers LK - https://open.uct.ac.za PB - University of Cape Town PY - 2004 T1 - A Bayesian assessment of the South Atlantic population of albacore which explicitly models changes in targeting TI - A Bayesian assessment of the South Atlantic population of albacore which explicitly models changes in targeting UR - http://hdl.handle.net/11427/17753 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/17753 | |
| dc.identifier.vancouvercitation | Rademeyer RA, Butterworth DS, Penney AJ. A Bayesian assessment of the South Atlantic population of albacore which explicitly models changes in targeting. Collective Volume of Scientific Papers. 2004; http://hdl.handle.net/11427/17753. | en_ZA |
| dc.language | eng | en_ZA |
| dc.publisher | International Commission for the Conservation of Atlantic Tuna (ICCAT) Secretariat | 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.relation.ispartofseries | Collective Volume of Scientific Papers | en_ZA |
| dc.source | Collective Volume of Scientific Papers | en_ZA |
| dc.subject.other | Albacore | |
| dc.subject.other | South Atlantic | |
| dc.subject.other | stock assessment | |
| dc.subject.other | ASPM | |
| dc.subject.other | MCMC | |
| dc.title | A Bayesian assessment of the South Atlantic population of albacore which explicitly models changes in targeting | en_ZA |
| dc.type | Journal Article | en_ZA |
| uct.type.publication | Research | en_ZA |
| uct.type.resource | Article | en_ZA |