A proposed Management Procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity
The status of the toothfish resource in the Prince Edward Islands region is unclear because CPUE data suggest considerable depletion, whereas catch-at-length information indicates that past catches have had relatively little impact on abundance. A Management Procedure (MP) approach is proposed to pr...
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MARAM, University of Cape Town
2009
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Online Access: | http://hdl.handle.net/11427/17758 https://open.uct.ac.za/bitstream/11427/17758/1/Brand%c3%a3o_A_proposed_Management_2009.pdf |
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ftunivcapetownir:oai:localhost:11427/17758 2023-05-15T17:54:44+02:00 A proposed Management Procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity Brandão, Anabela Butterworth, Doug S 2009 application/pdf http://hdl.handle.net/11427/17758 https://open.uct.ac.za/bitstream/11427/17758/1/Brand%c3%a3o_A_proposed_Management_2009.pdf eng eng MARAM, University of Cape Town University of Cape Town Faculty of Science Marine Resource Assessment and Management Group http://hdl.handle.net/11427/17758 https://open.uct.ac.za/bitstream/11427/17758/1/Brand%c3%a3o_A_proposed_Management_2009.pdf CCAMLR Science https://www.ccamlr.org/en/publications/ccamlr-science Patagonian toothfish Dissostichus eleginoides Management procedure Prince Edward Islands Journal Article 2009 ftunivcapetownir 2022-09-13T05:55:17Z The status of the toothfish resource in the Prince Edward Islands region is unclear because CPUE data suggest considerable depletion, whereas catch-at-length information indicates that past catches have had relatively little impact on abundance. A Management Procedure (MP) approach is proposed to provide a sound scientific basis to recommend future TACs in the face of this appreciable uncertainty. Four Operating Models (OMs) reflecting ‘Optimistic’, ‘Intermediate’, ‘Less Pessimistic’ and a ‘Pessimistic’ current status for the resource are developed which take account of the different selectivities of past longline and pot fisheries. These OMs are used for trials of a candidate generic MP which could provide future TAC recommendations for this resource. The MP uses two data sources: the recent trend in longline CPUE and the mean length of the catches made. An MP with control parameter values specified is proposed for implementation based on the results of the trials. Given the importance of an adequate catch rate for the economic viability of the fishery, the choice of control parameter values focused primarily on a reasonable probability of securing a catch rate increase, whatever the current resource status. MP performance is reasonably robust across a range of sensitivity tests, although it does deteriorate in conservation terms if the stock-recruitment curve steepness h is low. These tests also indicate that monitoring of future catch-at-length information would be necessary to guard against a change in selectivity towards greater catches of older fish. Article in Journal/Newspaper Patagonian Toothfish Prince Edward Islands University of Cape Town: OpenUCT Tac ENVELOPE(-59.517,-59.517,-62.500,-62.500) |
institution |
Open Polar |
collection |
University of Cape Town: OpenUCT |
op_collection_id |
ftunivcapetownir |
language |
English |
topic |
Patagonian toothfish Dissostichus eleginoides Management procedure Prince Edward Islands |
spellingShingle |
Patagonian toothfish Dissostichus eleginoides Management procedure Prince Edward Islands Brandão, Anabela Butterworth, Doug S A proposed Management Procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity |
topic_facet |
Patagonian toothfish Dissostichus eleginoides Management procedure Prince Edward Islands |
description |
The status of the toothfish resource in the Prince Edward Islands region is unclear because CPUE data suggest considerable depletion, whereas catch-at-length information indicates that past catches have had relatively little impact on abundance. A Management Procedure (MP) approach is proposed to provide a sound scientific basis to recommend future TACs in the face of this appreciable uncertainty. Four Operating Models (OMs) reflecting ‘Optimistic’, ‘Intermediate’, ‘Less Pessimistic’ and a ‘Pessimistic’ current status for the resource are developed which take account of the different selectivities of past longline and pot fisheries. These OMs are used for trials of a candidate generic MP which could provide future TAC recommendations for this resource. The MP uses two data sources: the recent trend in longline CPUE and the mean length of the catches made. An MP with control parameter values specified is proposed for implementation based on the results of the trials. Given the importance of an adequate catch rate for the economic viability of the fishery, the choice of control parameter values focused primarily on a reasonable probability of securing a catch rate increase, whatever the current resource status. MP performance is reasonably robust across a range of sensitivity tests, although it does deteriorate in conservation terms if the stock-recruitment curve steepness h is low. These tests also indicate that monitoring of future catch-at-length information would be necessary to guard against a change in selectivity towards greater catches of older fish. |
format |
Article in Journal/Newspaper |
author |
Brandão, Anabela Butterworth, Doug S |
author_facet |
Brandão, Anabela Butterworth, Doug S |
author_sort |
Brandão, Anabela |
title |
A proposed Management Procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity |
title_short |
A proposed Management Procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity |
title_full |
A proposed Management Procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity |
title_fullStr |
A proposed Management Procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity |
title_full_unstemmed |
A proposed Management Procedure for the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity |
title_sort |
proposed management procedure for the toothfish (dissostichus eleginoides) resource in the prince edward islands vicinity |
publisher |
MARAM, University of Cape Town |
publishDate |
2009 |
url |
http://hdl.handle.net/11427/17758 https://open.uct.ac.za/bitstream/11427/17758/1/Brand%c3%a3o_A_proposed_Management_2009.pdf |
long_lat |
ENVELOPE(-59.517,-59.517,-62.500,-62.500) |
geographic |
Tac |
geographic_facet |
Tac |
genre |
Patagonian Toothfish Prince Edward Islands |
genre_facet |
Patagonian Toothfish Prince Edward Islands |
op_source |
CCAMLR Science https://www.ccamlr.org/en/publications/ccamlr-science |
op_relation |
http://hdl.handle.net/11427/17758 https://open.uct.ac.za/bitstream/11427/17758/1/Brand%c3%a3o_A_proposed_Management_2009.pdf |
_version_ |
1766162539014520832 |