Updated investigation of the orange roughy south of Johnies given further data
| dc.contributor.author | Brandão, Anabela | |
| dc.contributor.author | Butterworth, Doug S | |
| dc.date.accessioned | 2016-03-22T11:01:11Z | |
| dc.date.available | 2016-03-22T11:01:11Z | |
| dc.date.issued | 2006 | |
| dc.date.updated | 2016-03-22T10:59:34Z | |
| dc.description.abstract | The biomass of orange roughy for the region south of Johnies is estimated coarsely by treating the product of standardised CPUE and area as an index of abundance, and then calibrating against population model based estimates of abundance from the recognised aggregations. For the intermittent aggregation model estimates of abundance, for Frankies and Rix, this suggests that cumulative catches from South Johnies would not have appreciably reduced abundance in the region. However, one of two model options to estimate the Johnies abundance yields more pessimistic results, and the decline in the standardised CPUE for the region over the last three years also raises concerns. Results from the ASPM assessment of the Johnies and South Johnies aggregations combined suggest a resource at 48% of its pre-exploitation level. Projections based upon this ASPM suggest that the medium term sustainable yield for the combined aggregation is in the vicinity of 750 t. | en_ZA |
| dc.identifier.apacitation | Brandão, A., & Butterworth, D. S. (2006). <i>Updated investigation of the orange roughy south of Johnies given further data</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/18166 | en_ZA |
| dc.identifier.chicagocitation | Brandão, Anabela, and Doug S Butterworth <i>Updated investigation of the orange roughy south of Johnies given further data.</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2006. http://hdl.handle.net/11427/18166 | en_ZA |
| dc.identifier.citation | Brandão, A., & Butterworth, D. S. (2006). Updated investigation of the orange roughy south of Johnies given further data. Namibian Ministry of Fisheries and Marine Resources document: DWFWG/WkShop/Feb06/Doc, 6(0). | en_ZA |
| dc.identifier.ris | TY - Working Paper AU - Brandão, Anabela AU - Butterworth, Doug S AB - The biomass of orange roughy for the region south of Johnies is estimated coarsely by treating the product of standardised CPUE and area as an index of abundance, and then calibrating against population model based estimates of abundance from the recognised aggregations. For the intermittent aggregation model estimates of abundance, for Frankies and Rix, this suggests that cumulative catches from South Johnies would not have appreciably reduced abundance in the region. However, one of two model options to estimate the Johnies abundance yields more pessimistic results, and the decline in the standardised CPUE for the region over the last three years also raises concerns. Results from the ASPM assessment of the Johnies and South Johnies aggregations combined suggest a resource at 48% of its pre-exploitation level. Projections based upon this ASPM suggest that the medium term sustainable yield for the combined aggregation is in the vicinity of 750 t. DA - 2006 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2006 T1 - Updated investigation of the orange roughy south of Johnies given further data TI - Updated investigation of the orange roughy south of Johnies given further data UR - http://hdl.handle.net/11427/18166 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/18166 | |
| dc.identifier.vancouvercitation | Brandão A, Butterworth DS. Updated investigation of the orange roughy south of Johnies given further data. 2006 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18166 | 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 | Updated investigation of the orange roughy south of Johnies given further data | 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 | Research paper | en_ZA |