Search results
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Results of a CCAMLR sponsored research survey to monitor abundance of subadult Antarctic toothfish in the southern Ross Sea, February 2013
first survey was completed in February (Hanchet al. 2012a). In this paper we provide the results of the ... second survey in the time series. The objectives of this second survey were: To carry out a longline ... survey to monitor subadult toothfish in the southern Ross Sea (strata A–C) using standardised gear in a ... standardised manner; and To sample additional experimental stations in adjacent areas to identify areas of high ...
Meeting Document : WG-SAM-13/32 : Author(s): S.J. Parker, S.M. Hanchet, S. Mormede, A. Dunn (New Zealand) and R. Sarralde (Spain)
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Oceanological factors affecting formation of mackerel icefish aggregations in the South Georgia area during different seasons of the year
Abstract: In wintering period icefish do not form aggregations, is feeding inactively and ... disperse at the depths more than 250 m within rather narrow temperature range (1.6-1,7ºC). In this period ... the water temperature is a limiting factor restricting fish distribution. In spring-summer icefish are ... feeding at the water temperature from 0.0ºC to 1.9ºC in the South Georgia area and to 2.0ºC near Shag ...
Meeting Document : WG-FSA-05/76 : Author(s): Zh.A. Frolkina (Russia)
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Variation in echosounder calibration with temperature and some possible implications for acoustic surveys of krill biomass
krill surveys, and exhibits acceptable temporal stability in system gain settings. Between Antarctic ... seasons, this echo-sounder has additionally been calibrated in temperate European waters and, under these ... conditions, calibrated gain settings differ markedly from those applied in the Antarctic, even after ... appropriate adjustments for differences in sound speed between locations have been made. Here we present ...
Meeting Document : WG-EMM-97/52 : Author(s): Watkins, J.L., Woodroffe, P., Brierley, A.S., Goss, C.
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Preliminary analyses of an ectoparasite Eubrachiella antarctica as a marker for stock discrimination of Antarctic toothfish in the Ross Sea
antarctica as a marker for stock discrimination of Antarctic toothfish in the Ross Sea. New Zealand Ministry ... fins and in the buccal cavity of 621 large D. mawsoni (mostly 120-150 cm). Up to five D. mawsoni per ... set were examined for parasites in Small Scale Research Units (SSRUs) 88.1C, 88.2E and 88.2F; and two ... fish per set in SSRUs 88.1H- 88.1J. Up to 15 E. antarctica, one from each of the first fifteen sets in ...
Meeting Document : WG-FSA-06/28 : Author(s): P.J. Smith, A. McKenzie and L. Tubbs (New Zealand)
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Physical forcing in the southwest Atlantic: ecosystem control
Abstract: In the southwest Atlantic sector of the Southern Ocean, temporal variability in the ... temperature at South Georgia shows the presence of high levels of autocorrelation, with periodicity evident in ... anomaly data for the El Niño 4 region in the Pacific show that variability at South Georgia also reflects ... temperature fluctuations in the Pacific, with the Pacific leading South Georgia by approximately 3 years ...
Meeting Document : WG-EMM-04/34 : Author(s): P.N. Trathan, E.J. Murphy, J. Forcada, J.P. Croxall, K. Reid and S.E. Thorpe (United Kingdom)
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Foraging areas of black-browed and grey-headed albatrosses breeding on Macquarie Island in relation to marine protected areas
-order predators, there is a paucity of data that can be used to evaluate their efficacy in achieving ... this purpose. 2. We assessed the effectiveness of a network of MPAs around Macquarie Island in the ... Exclusion Zone around Macquarie Island. In contrast, grey-headed albatrosses (T. chrysostoma) spent on only ... 34 % of their time foraging in MPAs. 4. Black-browed and grey-headed albatrosses spent 30 % and 15 ...
Meeting Document : WG-FSA-04/49 : Author(s): A. Terauds, R. Gales, G.B. Baker and R. Alderman (Australia)
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Population assessment of Patagonian toothfish in Subarea 48.4 – 2011 update
Abstract: In this paper we update the assessment of D. eleginoides in the northern half of ... Subarea 48.4 presented in 2010. The CASAL model is improved through the incorporation catch at age data ... , as an alternative to the catch at length data that were the only such data available in 2010. The ... catch at age model generates a yield of 52 tonnes based on CCAMLR decision rules. In 2006 the northern ...
Meeting Document : WG-FSA-11/38 : Author(s): J. Roberts, R. Mitchell and R. Wakeford (United Kingdom)
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Proposal for an extension to the mark recapture experiment to estimate toothfish population size in Subarea 48.4
assessment of D. eleginoides stock size in the Northern Area of 48.4 estimates a vulnerable biomass of ... between 1,000 to 2,000 tonnes. 3. The UK proposes to continue the mark-recapture experiment in Subarea ... 48.4 in the 2008/09 fishing season so as to allow for a full assessment of D. eleginoides stock size in ... the Northern in 2009. 4. Additionally, the UK proposes to commence a mark-recapture experiment in the ...
Meeting Document : WG-FSA-08/46 : Author(s): J. Roberts and D. J. Agnew (UK)
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Change in environmental conditions of the Southern Ocean observed by satellites and data-assimilating models between 1981 and 2019
Abstract: We provide a summary of environmental change in the Southern Ocean over the period of ... movement north of the Subantarctic Front; (3) increasing chl-a and NPP in the Subantarctic Front and around ... the southern limit of the ACC except in the Ross Sea region; (4) decreasing chl-a and NPP in the Ross ... Sea sector and on the Antarctic continental shelf; (5) gradual loss of sea-ice in the Amundsen Sea and ...
Meeting Document : WG-EMM-2019/39 : Author(s): M. Pinkerton
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Report of the UK Groundfish Survey at South Georgia (CCAMLR Subarea 48.3) in January/February 2019
in 2017, but is comparable with the long term average. The highest catches were on the moraine banks ... of the two northern strata and at the western end of Shag Rocks, with one high catch recorded in the ... South West stratum. Clear regional differences in C. gunnari diet composition were observed. At Shag ... . superba as a prey species varied across the four regions at South Georgia, ranging from 10.48% IRI in the ...
Meeting Document : WG-FSA-2019/20 : Author(s): S. Gregory, P. Hollyman, T. Earl, A. Clement, J. Visagie, L. Featherstone and M. Belchier