Updated 2017 Nightingale island rock lobster assessment
| dc.contributor.author | Johnston, S J | |
| dc.contributor.author | Butterworth, Doug S | |
| dc.date.accessioned | 2017-11-06T12:56:48Z | |
| dc.date.available | 2017-11-06T12:56:48Z | |
| dc.date.issued | 2017-05 | |
| dc.description.abstract | This paper provides a further updated assessment of the rock lobster resource at Nightingale island. This assessment includes updated data from both the commercial fishery and the biomass surveys. The recent (2013-2016) high GLM standardised CPUE values (and biomass survey index values) at the island which were not initially anticipated, suggest that the negative impact of the OLIVA incident on adults may have been overestimated previously. The recent high CPUE indicates that the adult mortality in 2011 due to the OLIVA incident was much less than originally assumed. The 2017 RC assessment thus now assumes zero adult mortality in 2011 due to the OLIVA incident, but continues to assume an 80% juvenile mortality due to this incident in 2011. Projections suggest that the resource could readily sustain future catches kept constant at 75 MT or somewhat higher, though there may be a brief downturn in catch rates in the near future if the OLIVA incident led to a high mortality of juveniles at that time. An OMP is to be developed for this fishery to be used in setting the TAC for the next 2017/18 season. | en_ZA |
| dc.identifier.apacitation | Johnston, S. J., & Butterworth, D. S. (2017). <i>Updated 2017 Nightingale island rock lobster assessment</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/26011 | en_ZA |
| dc.identifier.chicagocitation | Johnston, S J, and D S Butterworth <i>Updated 2017 Nightingale island rock lobster assessment.</i> University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2017. http://hdl.handle.net/11427/26011 | en_ZA |
| dc.identifier.citation | Johnston, S.J. and Butterworth, D.S. 2017. Updated 2017 Nightingale island rock lobster assessment. MARAM document: MARAM/TRISTAN/2017/MAY/07: 22pp. | en_ZA |
| dc.identifier.ris | TY - Working Paper AU - Johnston, S J AU - Butterworth, D S AB - This paper provides a further updated assessment of the rock lobster resource at Nightingale island. This assessment includes updated data from both the commercial fishery and the biomass surveys. The recent (2013-2016) high GLM standardised CPUE values (and biomass survey index values) at the island which were not initially anticipated, suggest that the negative impact of the OLIVA incident on adults may have been overestimated previously. The recent high CPUE indicates that the adult mortality in 2011 due to the OLIVA incident was much less than originally assumed. The 2017 RC assessment thus now assumes zero adult mortality in 2011 due to the OLIVA incident, but continues to assume an 80% juvenile mortality due to this incident in 2011. Projections suggest that the resource could readily sustain future catches kept constant at 75 MT or somewhat higher, though there may be a brief downturn in catch rates in the near future if the OLIVA incident led to a high mortality of juveniles at that time. An OMP is to be developed for this fishery to be used in setting the TAC for the next 2017/18 season. DA - 2017-05 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2017 T1 - Updated 2017 Nightingale island rock lobster assessment TI - Updated 2017 Nightingale island rock lobster assessment UR - http://hdl.handle.net/11427/26011 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/26011 | |
| dc.identifier.vancouvercitation | Johnston SJ, Butterworth DS. Updated 2017 Nightingale island rock lobster assessment. 2017 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/26011 | 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 2017 Nightingale island rock lobster assessment | 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 | Working paper | en_ZA |