Further examinations of the SBT operating model to explore new tagging model and grid specifications
| dc.contributor.author | Kurota, Hiroyuki | |
| dc.contributor.author | Sakai, Osamu | |
| dc.contributor.author | Takahashi, Norio | |
| dc.contributor.author | Butterworth, Doug S | |
| dc.date.accessioned | 2016-04-07T08:54:35Z | |
| dc.date.available | 2016-04-07T08:54:35Z | |
| dc.date.issued | 2009 | |
| dc.date.updated | 2016-04-07T08:53:39Z | |
| dc.description.abstract | Stock assessments and constant catch projections were conducted using new Operating Models (OMs; sbtmod21 and sbtmod22, which have different tagging models) developed by the CCSBT ESC. The current analysis showed that: 1. a new candidate for the tagging model (incorporated in sbtmod22) led to higher M0 (natural mortality at age 0), lower M10 (natural mortality at age 10) and lower omega (non-linearity of the CPUE-abundance relationship) estimates than the previous tagging model which is used in sbtmod21, and estimated lower current stock abundance relative to the virgin unfished biomass, 2. a high S (S=0.5; S is the proportion of longline overcatch attributed to the reported effort) led to a lower M10, but the overall results were scarcely different from those for the base assumption (S=0.25), and 3. a slight change of assumptions regarding the Indonesian fishing selectivity impacted on M estimates substantially (leading to low M0 and high M10), which indicates poor ability to explain the Indonesian catch-at-age data when using a low M10 as pointed out during the 2008 SAG meeting. | en_ZA |
| dc.identifier.apacitation | Kurota, H., Sakai, O., Takahashi, N., & Butterworth, D. S. (2009). <i>Further examinations of the SBT operating model to explore new tagging model and grid specifications</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/18677 | en_ZA |
| dc.identifier.chicagocitation | Kurota, Hiroyuki, Osamu Sakai, Norio Takahashi, and Doug S Butterworth <i>Further examinations of the SBT operating model to explore new tagging model and grid specifications.</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2009. http://hdl.handle.net/11427/18677 | en_ZA |
| dc.identifier.citation | Kurota, H., Sakai, O., Takahashi, N., & Butterworth, D. S. (2009). Further examinations of the SBT operating model to explore new tagging model and grid specifications. CCSBT-OMMP/0907/05 | en_ZA |
| dc.identifier.ris | TY - Report AU - Kurota, Hiroyuki AU - Sakai, Osamu AU - Takahashi, Norio AU - Butterworth, Doug S AB - Stock assessments and constant catch projections were conducted using new Operating Models (OMs; sbtmod21 and sbtmod22, which have different tagging models) developed by the CCSBT ESC. The current analysis showed that: 1. a new candidate for the tagging model (incorporated in sbtmod22) led to higher M0 (natural mortality at age 0), lower M10 (natural mortality at age 10) and lower omega (non-linearity of the CPUE-abundance relationship) estimates than the previous tagging model which is used in sbtmod21, and estimated lower current stock abundance relative to the virgin unfished biomass, 2. a high S (S=0.5; S is the proportion of longline overcatch attributed to the reported effort) led to a lower M10, but the overall results were scarcely different from those for the base assumption (S=0.25), and 3. a slight change of assumptions regarding the Indonesian fishing selectivity impacted on M estimates substantially (leading to low M0 and high M10), which indicates poor ability to explain the Indonesian catch-at-age data when using a low M10 as pointed out during the 2008 SAG meeting. DA - 2009 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2009 T1 - Further examinations of the SBT operating model to explore new tagging model and grid specifications TI - Further examinations of the SBT operating model to explore new tagging model and grid specifications UR - http://hdl.handle.net/11427/18677 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/18677 | |
| dc.identifier.vancouvercitation | Kurota H, Sakai O, Takahashi N, Butterworth DS. Further examinations of the SBT operating model to explore new tagging model and grid specifications. 2009 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18677 | 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 | SBT operating model | |
| dc.subject.other | tagging model | |
| dc.subject.other | grid specifications | |
| dc.title | Further examinations of the SBT operating model to explore new tagging model and grid specifications | en_ZA |
| dc.type | Report | en_ZA |
| uct.type.filetype | Text | |
| uct.type.publication | Research | en_ZA |
| uct.type.resource | Research paper | en_ZA |