The 2004 age-structured production model assessments and projections for the South Coast rock lobster resource
| dc.contributor.author | Johnston, Susan J | |
| dc.contributor.author | Butterworth, Doug S | |
| dc.date.accessioned | 2016-04-12T09:12:03Z | |
| dc.date.available | 2016-04-12T09:12:03Z | |
| dc.date.issued | 2004 | |
| dc.date.updated | 2016-04-12T09:10:53Z | |
| dc.description.abstract | The assessment conducted in 2003 has been routinely extended, taking account of a further year’s catch, CPUE and catch-at-age data. CPUE shows a continuation of the increase that commenced in 1998. Results are generally more optimistic than those for the 2003 assessment; this is shown to be a result of both the new abundance data now available as well as the revision of the historic catch series, with the former having slightly the larger effect. The Reference Case (RC) scenario suggests that a TAC of 360 MT or less would be appropriate to prevent biomass decline in the future. Other scenarios suggest either higher or lower values than this. If the catch-at-age data are down-weighted, then this appropriate level for the TAC is increased to 390 MT. On the other hand, the scenario which assumes the 1995+ recruitment to be equal to the average of the previous 10 years is more pessimistic and suggests an appropriate TAC level of only some 300 MT | en_ZA |
| dc.identifier.apacitation | Johnston, S. J., & Butterworth, D. S. (2004). <i>The 2004 age-structured production model assessments and projections for the South Coast rock lobster resource</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/18780 | en_ZA |
| dc.identifier.chicagocitation | Johnston, Susan J, and Doug S Butterworth <i>The 2004 age-structured production model assessments and projections for the South Coast rock lobster resource.</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2004. http://hdl.handle.net/11427/18780 | en_ZA |
| dc.identifier.citation | Johnston, S. J., & Butterworth, D. S. (2004). The 2004 age-structured production model assessments and projections for the South Coast rock lobster resource. WG/07/04/SCL/10 | en_ZA |
| dc.identifier.ris | TY - Working Paper AU - Johnston, Susan J AU - Butterworth, Doug S AB - The assessment conducted in 2003 has been routinely extended, taking account of a further year’s catch, CPUE and catch-at-age data. CPUE shows a continuation of the increase that commenced in 1998. Results are generally more optimistic than those for the 2003 assessment; this is shown to be a result of both the new abundance data now available as well as the revision of the historic catch series, with the former having slightly the larger effect. The Reference Case (RC) scenario suggests that a TAC of 360 MT or less would be appropriate to prevent biomass decline in the future. Other scenarios suggest either higher or lower values than this. If the catch-at-age data are down-weighted, then this appropriate level for the TAC is increased to 390 MT. On the other hand, the scenario which assumes the 1995+ recruitment to be equal to the average of the previous 10 years is more pessimistic and suggests an appropriate TAC level of only some 300 MT DA - 2004 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2004 T1 - The 2004 age-structured production model assessments and projections for the South Coast rock lobster resource TI - The 2004 age-structured production model assessments and projections for the South Coast rock lobster resource UR - http://hdl.handle.net/11427/18780 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/18780 | |
| dc.identifier.vancouvercitation | Johnston SJ, Butterworth DS. The 2004 age-structured production model assessments and projections for the South Coast rock lobster resource. 2004 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18780 | 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 | rock lobster resource | |
| dc.title | The 2004 age-structured production model assessments and projections for the South Coast rock lobster resource | 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 |