Assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2013
The ASPM assessment of the Prince Edward Islands toothfish resource by Brandão and Butterworth (2007) that permitted annual fluctuations about a deterministic stockrecruitment relationship is updated to take account of further catch, GLMM standardised CPUE and catch-at-length information that has be...
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University of Cape Town
2013
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Online Access: | http://hdl.handle.net/11427/18672 https://open.uct.ac.za/bitstream/11427/18672/1/Brand%c3%a3o_Assessment_toothfish_2013.pdf |
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ftunivcapetownir:oai:localhost:11427/18672 2023-05-15T18:03:26+02:00 Assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2013 Brandão, Anabela Butterworth, Doug S 2013 application/pdf http://hdl.handle.net/11427/18672 https://open.uct.ac.za/bitstream/11427/18672/1/Brand%c3%a3o_Assessment_toothfish_2013.pdf eng eng University of Cape Town Faculty of Science Marine Resource Assessment and Management Group http://hdl.handle.net/11427/18672 https://open.uct.ac.za/bitstream/11427/18672/1/Brand%c3%a3o_Assessment_toothfish_2013.pdf Working Paper 2013 ftunivcapetownir 2022-09-13T05:51:44Z The ASPM assessment of the Prince Edward Islands toothfish resource by Brandão and Butterworth (2007) that permitted annual fluctuations about a deterministic stockrecruitment relationship is updated to take account of further catch, GLMM standardised CPUE and catch-at-length information that has become available for the years 2007 to 2013. The assessment allows for three fleets to accommodate data from a pot fishery that operated in 2004 and 2005 and a trotline fishery since 2008 in addition to the Spanish longline operations. Biological parameter values adopted for Subarea 48.3 are used. The resource is estimated to be at a depletion of about 87% of its average pre-exploitation level in terms of spawning biomass, but this requires large recruitment pulses in the 1990s and does not reflect the large CPUE decline when the fishery commenced. Imposing alternative constraints lead to a depletion of about 43%. These different assessments imply rather different sustainable yields, though all suggest medium term abundance increases for a TAC of 500 t. Report Prince Edward Islands University of Cape Town: OpenUCT Butterworth ENVELOPE(66.733,66.733,-70.700,-70.700) 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 |
description |
The ASPM assessment of the Prince Edward Islands toothfish resource by Brandão and Butterworth (2007) that permitted annual fluctuations about a deterministic stockrecruitment relationship is updated to take account of further catch, GLMM standardised CPUE and catch-at-length information that has become available for the years 2007 to 2013. The assessment allows for three fleets to accommodate data from a pot fishery that operated in 2004 and 2005 and a trotline fishery since 2008 in addition to the Spanish longline operations. Biological parameter values adopted for Subarea 48.3 are used. The resource is estimated to be at a depletion of about 87% of its average pre-exploitation level in terms of spawning biomass, but this requires large recruitment pulses in the 1990s and does not reflect the large CPUE decline when the fishery commenced. Imposing alternative constraints lead to a depletion of about 43%. These different assessments imply rather different sustainable yields, though all suggest medium term abundance increases for a TAC of 500 t. |
format |
Report |
author |
Brandão, Anabela Butterworth, Doug S |
spellingShingle |
Brandão, Anabela Butterworth, Doug S Assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2013 |
author_facet |
Brandão, Anabela Butterworth, Doug S |
author_sort |
Brandão, Anabela |
title |
Assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2013 |
title_short |
Assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2013 |
title_full |
Assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2013 |
title_fullStr |
Assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2013 |
title_full_unstemmed |
Assessment of the toothfish (Dissostichus eleginoides) resource in the Prince Edward Islands vicinity to include data from 1997 to 2013 |
title_sort |
assessment of the toothfish (dissostichus eleginoides) resource in the prince edward islands vicinity to include data from 1997 to 2013 |
publisher |
University of Cape Town |
publishDate |
2013 |
url |
http://hdl.handle.net/11427/18672 https://open.uct.ac.za/bitstream/11427/18672/1/Brand%c3%a3o_Assessment_toothfish_2013.pdf |
long_lat |
ENVELOPE(66.733,66.733,-70.700,-70.700) ENVELOPE(-59.517,-59.517,-62.500,-62.500) |
geographic |
Butterworth Tac |
geographic_facet |
Butterworth Tac |
genre |
Prince Edward Islands |
genre_facet |
Prince Edward Islands |
op_relation |
http://hdl.handle.net/11427/18672 https://open.uct.ac.za/bitstream/11427/18672/1/Brand%c3%a3o_Assessment_toothfish_2013.pdf |
_version_ |
1766174295806967808 |