Search results
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Descriptive analysis of mesopelagic backscatter from acoustic data collected in the Ross Sea
estimate middle trophic level prey organisms (e.g., krill and mesopelagic fish) in the Ross Sea. Single ... frequency (38 kHz) acoustic data were available from New Zealand longline vessels participating in the ... exploratory fishery for toothfish in 2002–03 and 2005–06, and multifrequency (12, 38, and 120 kHz) acoustic ... data were collected from the research vessel Tangaroa during a voyage to the western Ross Sea in ...
Meeting Document : WG-EMM-06/11 : Author(s): R.L. O’Driscoll (New Zealand)
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A brief characterisation of Patagonian toothfish tag survival and tag detection in CCAMLR Statistical Area 48.3
Abstract: Mark-recapture data is a central element in the assessment of population size and ... growth and the stock assessment for Patagonian Toothfish (Dissostichus eleginoides) in CCAMLR subarea ... 48.3 relies on accurate tagging samples for its assessment. The bias in tagging survival and tag ... detection is assumed to be minimal in the model, but this assumption has not previously been tested; a ...
Meeting Document : WG-FSA-13/29 : Author(s): M. Soeffker and R. Scott (United Kingdom)
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A TIME FOR ACTION IN THE MANAGEMENT OF ANTARCTIC KRILL FISHERIES
Abstract: In this paper, ASOC draws CCAMLR’s attention to the most pressing issues in relation to ... address key scientific uncertainties at the SSMU level in Area 48, and the consideration of feedback ... management approaches in this Area as soon as possible. In addition, ASOC maintains that CCAMLR should take ... precautionary measures to prevent concentration of catches in coastal areas as the fishery approaches the ...
Meeting Document : CCAMLR-XXVII/BG/24 : Author(s): Submitted by ASOC
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On assessing the size of the humped rockcod stock (Notothenia gibberifrons) in Subarea 48.3
Abstract: An adaptive approach was used to assess the Notothenia gibberifrons stock in Area 48.3 ... approach in this case involved using a target function in the form of the sum of square deviations in ... logarithms of observed and calculated biomass indices and resulted in an estimate of from 21.5 to 42.1 ... thousand tonnes for N. gibberifrons biomass in the 1989/90 season. It is thus possible to suggest a TAC of ...
Meeting Document : WG-FSA-91/26 : Author(s): P.S. Gasiukov (USSR)
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A summary of scientific observer deployments and data collection in the krill fishery during the 2011, 2012 and 2013 seasons
Abstract: The level of observer coverage in the krill fishery and the scientific sampling ... undertaken are summarised. During 2012 all 12 of the vessels that participated in the krill fishery carried ... observers for some or all of their fishing operations. From a total of 860 vessel days of fishing in 2012 ... ‘days’. Krill length-frequency distributions showed that the greatest variability in size structure ...
Meeting Document : WG-EMM-13/38 : Author(s): CCAMLR Secretariat
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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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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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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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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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Assessing status and change in Southern Ocean ecosystems
trends of Southern Ocean marine ecosystems overall, against which change in ecosystem structure and ... function can be unambiguously assessed in the future. This challenge includes being able to assess the ... likelihood of different states in the future. These requirements are needed by different bodies regionally ... and globally for making tactical decisions, such as catch limits and conservation requirements in the ...
Meeting Document : WG-EMM-13/36 : Author(s): A. Constable (Australia), D. Costa (USA), E. Murphy (United Kingdom), E. Hofmann, O. Schofield (USA), A. Press (Australia), N. Johnston (United Kingdom) and L. Newman (Australia)