On the implication of tagging analyses for the shape of selectivity at age for Gulf of Maine Cod
| dc.contributor.author | Butterworth, Doug S | |
| dc.contributor.author | Rademeyer, Rebecca A | |
| dc.date.accessioned | 2016-04-26T09:12:42Z | |
| dc.date.available | 2016-04-26T09:12:42Z | |
| dc.date.issued | 2008 | |
| dc.date.updated | 2016-04-26T09:09:06Z | |
| dc.description.abstract | This paper provides some comments in response to Hart and Miller’s (2008) interpretation of the implications of their analyses of tagging data regarding the dome shape estimated for selectivity for Gulf of Maine cod in the ASPM Reference Case assessment of Butterworth and Rademeyer (2008a). It is first informative to consider the sensitivity of the 2007 Reference Case ASPM assessment of Butterworth and Rademeyer (2008a) to alternative values of age-independent natural mortality M. The results are shown in Table 1 and Fig. 1 below. From Fig. 1 it is clear that the inference or otherwise of a dome in selectivity depends strongly on the value assumed for M. If M=0.2 yr-1 as assumed for the Butterworth and Rademeyer (2008a) Reference Case, then selectivity for the NEFSC surveys is appreciably dome shaped with a rapid decline with age above age 7. However for M ~ 0.4 – 0.5, the selectivity for these ages becomes effectively flat. Interestingly, the tagging analyses of Hart and Miller (2008), from which they infer such flat selectivity, estimate (approximately) M=0.5 for length60 cm. | en_ZA |
| dc.identifier.apacitation | Butterworth, D. S., & Rademeyer, R. A. (2008). <i>On the implication of tagging analyses for the shape of selectivity at age for Gulf of Maine Cod</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/19203 | en_ZA |
| dc.identifier.chicagocitation | Butterworth, Doug S, and Rebecca A Rademeyer <i>On the implication of tagging analyses for the shape of selectivity at age for Gulf of Maine Cod.</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2008. http://hdl.handle.net/11427/19203 | en_ZA |
| dc.identifier.citation | Butterworth, D. S., & Rademeyer, R. A. (2008). On the Implications of Tagging Analyses for the Shape of Selectivity at Age for Gulf of Maine Cod. US North East Fisheries Science Centre GARM WP4, 8, 1-5. | en_ZA |
| dc.identifier.ris | TY - Working Paper AU - Butterworth, Doug S AU - Rademeyer, Rebecca A AB - This paper provides some comments in response to Hart and Miller’s (2008) interpretation of the implications of their analyses of tagging data regarding the dome shape estimated for selectivity for Gulf of Maine cod in the ASPM Reference Case assessment of Butterworth and Rademeyer (2008a). It is first informative to consider the sensitivity of the 2007 Reference Case ASPM assessment of Butterworth and Rademeyer (2008a) to alternative values of age-independent natural mortality M. The results are shown in Table 1 and Fig. 1 below. From Fig. 1 it is clear that the inference or otherwise of a dome in selectivity depends strongly on the value assumed for M. If M=0.2 yr-1 as assumed for the Butterworth and Rademeyer (2008a) Reference Case, then selectivity for the NEFSC surveys is appreciably dome shaped with a rapid decline with age above age 7. However for M ~ 0.4 – 0.5, the selectivity for these ages becomes effectively flat. Interestingly, the tagging analyses of Hart and Miller (2008), from which they infer such flat selectivity, estimate (approximately) M=0.5 for length60 cm. DA - 2008 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2008 T1 - On the implication of tagging analyses for the shape of selectivity at age for Gulf of Maine Cod TI - On the implication of tagging analyses for the shape of selectivity at age for Gulf of Maine Cod UR - http://hdl.handle.net/11427/19203 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/19203 | |
| dc.identifier.vancouvercitation | Butterworth DS, Rademeyer RA. On the implication of tagging analyses for the shape of selectivity at age for Gulf of Maine Cod. 2008 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/19203 | 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 | tagging analyses | |
| dc.subject.other | Gulf of Maine Cod | |
| dc.title | On the implication of tagging analyses for the shape of selectivity at age for Gulf of Maine Cod | 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 |