Updated stock assessment of Namibian orange roughy populations under the assumption of intermittent aggregation
| dc.contributor.author | Brandão, Anabela | |
| dc.contributor.author | Butterworth, Doug S | |
| dc.date.accessioned | 2016-03-29T12:39:39Z | |
| dc.date.available | 2016-03-29T12:39:39Z | |
| dc.date.issued | 2004 | |
| dc.date.updated | 2016-03-29T12:37:39Z | |
| dc.description.abstract | Updated assessments of the four orange roughy aggregations off Namibia, based upon a maximum penalised likelihood approach which uses all available indices of abundance and reflects the proportion of a stock present at the fishing aggregation each year, are presented, and projections under constant catch levels reported. Results suggest that Johnies, Frankies and Rix are all presently at some 60% of their preexploitation level, but that Hotspot is perhaps much more depleted. Overall, medium term sustainable yields would seem to be in the 2 500–2 750 ton range. Broadly speaking, MSY estimates are some 10% less than estimated a year previously. However, varying proportions of abundance present at aggregations from year to year would lead to difficulties in making a catch of this size every year. | en_ZA |
| dc.identifier.apacitation | Brandão, A., & Butterworth, D. S. (2004). <i>Updated stock assessment of Namibian orange roughy populations under the assumption of intermittent aggregation</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/18357 | en_ZA |
| dc.identifier.chicagocitation | Brandão, Anabela, and Doug S Butterworth <i>Updated stock assessment of Namibian orange roughy populations under the assumption of intermittent aggregation.</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2004. http://hdl.handle.net/11427/18357 | en_ZA |
| dc.identifier.citation | Brandão, A., & Butterworth, D. S. (2004). Updated stock assessment of Namibian orange roughy populations under the assumption of intermittent aggregation. Namibian Ministry of Fisheries and Marine Resources document DWFWG/WkShop/Mar04/Doc, 2. | en_ZA |
| dc.identifier.ris | TY - Working Paper AU - Brandão, Anabela AU - Butterworth, Doug S AB - Updated assessments of the four orange roughy aggregations off Namibia, based upon a maximum penalised likelihood approach which uses all available indices of abundance and reflects the proportion of a stock present at the fishing aggregation each year, are presented, and projections under constant catch levels reported. Results suggest that Johnies, Frankies and Rix are all presently at some 60% of their preexploitation level, but that Hotspot is perhaps much more depleted. Overall, medium term sustainable yields would seem to be in the 2 500–2 750 ton range. Broadly speaking, MSY estimates are some 10% less than estimated a year previously. However, varying proportions of abundance present at aggregations from year to year would lead to difficulties in making a catch of this size every year. DA - 2004 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2004 T1 - Updated stock assessment of Namibian orange roughy populations under the assumption of intermittent aggregation TI - Updated stock assessment of Namibian orange roughy populations under the assumption of intermittent aggregation UR - http://hdl.handle.net/11427/18357 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/18357 | |
| dc.identifier.vancouvercitation | Brandão A, Butterworth DS. Updated stock assessment of Namibian orange roughy populations under the assumption of intermittent aggregation. 2004 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18357 | 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 stock assessment of Namibian orange roughy populations under the assumption of intermittent aggregation | 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 |