Search results
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Preliminary assessment of toothfish in Subarea 48.3
were high numbers of the 2001 cohort in commercial catches in 2009 onwards. It is likely that it is ... due to a combination of a strong 2001 cohort and a change in selectivity for the commercial fleet, but ... surveys and the stabilisation of both SSB and CPUE that a long-term yield in the region of 2 000 tonnes ... assessment of toothfish in Subarea 48.3 Approval: Approved ...
Meeting Document : WG-FSA-11/33 Rev. 1 : Author(s): T. Peatman, R.E. Mitchell, G. Parkes and D.J. Agnew (United Kingdom)
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Depletion-corrected average catch: a simple formula for estimating sustainable yields in data-poor situations
yield component and an unsustainable “windfall” component associated with a one-time reduction in stock ... production, in the form of a “windfall ratio”. The DCAC is calculated as the sum of catches divided by the ... sum of the number of years in the catch series and this windfall ratio. Input information includes the ... sum of catches and associated number of years, the relative reduction in biomass during that period ...
Meeting Document : WG-SAM-11/P3 : Author(s): A.D. McCall
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Biological acoustic survey in the marginal ice edge zone of the Bellingshausen Sea
Abstract: An acoustic survey at 38 and 120 kHz was carried out from RRS Discovery in the ... of krill (Euphausia superba) distribution and biomass in the marginal ice edge zone. Krill biomass ... phase. On this first survey a large swarm (2.8 km in extent) had a potential biomass of 3.7 x 104 tonnes ... . Some calculations are presented to show the potential impact of krill on the flux of carbon in the area ...
Meeting Document : WG-Krill-94/32 : Author(s): A.W.A. Murray, J.L. Watkins and D.G. Bone (United Kingdom)
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Survey estimates of recruitment of toothfish in Subarea 48.3
data used by the Working Group for toothfish assessments in 1999 and later were correct. We found ... , the modal progression of peaks in the length densities corresponding to cohorts assessed by sequential ... consistently determined from the survey data. The expected reduction in cohort density with time at a log-scale ... rate of-0.16 (natural mortality) was evident in only very few cohort plots, even those which were ...
Meeting Document : WG-FSA-SAM-04/16 : Author(s): Collins, M., Wakeford, R.C., Moir-Clark, J., Belchier, M., Agnew, D.J.
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Robust characterisation of the age structure, growth and recruitment of toothfish in the Macquarie Island and Heard Island and McDonald Islands fisheries
, collected during the 2000-2011 fishing seasons in Division 58.5.2 and outside the CCAMLR area at Macquarie ... , as well as allowing more precise estimates of the selectivity of the different fishing gears used in ... the stock assessment in Division 58.5.2 compared to a scenario using only catch at length data. The ... in developing an ageing program. Author(s): D.C. Welsford, S.G. Candy, J.J. Verdouw and J.J ...
Meeting Document : WG-FSA-12/P07 : Author(s): D.C. Welsford, S.G. Candy, J.J. Verdouw and J.J. Hutchins
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A revised assessment of Patagonian toothfish in Subarea 48.4
Abstract: The stocks of toothfish in Subarea 48.4 are currently divided, for assessment purposes ... species are caught throughout Subarea 48.4 although D. eleginoides are predominantly caught in the north ... , whilst D. mawsoni are mainly caught in the south. WG-FSA 2012 concluded that species specific assessments ... . eleginoides in Subarea 48.4. The main changes to the assessment are: the removal of D. mawsoni data and the ...
Meeting Document : WG-SAM-13/24 : Author(s): R. Scott (United Kingdom)
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Report of vulnerable marine ecosystems in South Georgia Islands (CCAMLR Subarea 48.3) through research dredge sampling
Abstract: In this contribution we report the presence of 6 vulnerable marine ecosystems (VME ... inclusion in the CCAMLR VME registry, were detected during a research cruise performed by the National ... here with previous reports in the same area. Thus, owing to high diversity and abundance of indicators ... by fishing activity in the area of the CCAMLR convention. Author(s): E. Gaitán, L. Schejter, D ...
Meeting Document : WG-FSA-13/58 : Author(s): E. Gaitán, L. Schejter, D. Giberto, M. Escolar and C. Bremec (Argentina)
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Preliminary assessment of Patagonian toothfish in Subarea 48.4
Abstract: To date, the stocks of toothfish in Subarea 48.4 have been divided, for assessment ... in the north, whilst D. mawsoni are mainly caught in the south. CCAMLR WG-FSA 2012 concluded that ... revised assessment of D. eleginoides in Subarea 48.4. The main changes to the assessment are: the removal ... Patagonian toothfish in Subarea 48.4 Approval: Approved ...
Meeting Document : WG-FSA-13/31 : Author(s): R. Scott and V. Laptikohvsky (United Kingdom)
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Spatial and temporal patterns of sperm whale (Physeter macrocephalus) depredation on Australian longline vessels in the Patagonian toothfish (Dissostichus eleginoides) fishery at Heard Island and McDonald Islands (CCAMLR Division 58.5.2)
) and orcas (Orcinus orca) has been reported in nearly all of the Patagonian toothfish (Dissostichus ... eleginoides) longline fisheries in the Southern Ocean (Moir Clark and Agnew 2010, Tixier et al 2010, Soeffker ... and Tixier 2015, Söffker et al. 2015). The first reports of odontocete depredation in the Division ... 58.5.2 fishery date from 2011, and incidences have been reported in every season thereafter. The majority ...
Meeting Document : WG-FSA-15/53 : Author(s): D.C. Welsford and R. Arangio (Australia)
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Report of the South Georgia groundfish survey (Subarea 48.3) in January 2006
Abstract: The biennial South Georgia Groundfish Survey was undertaken in January 2006 on board ... the N and NE of South Georgia. Fish in spawning condition (Stage IV) were found at the eastern end of ... + fish in 2003. The toothfish diet was dominated by Patagonotothen guntheri. Acoustic observations were ... made in association with both demersal and pelagic data and will help discriminate icefish from other ...
Meeting Document : WG-FSA-06/51 : Author(s): M.A. Collins, C. Jones, J. Clark. S. Fielding, J. Slakowski, T. North, W. Reid and J. Watts (United Kingdom)