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Exploration of CPUE standardisation variances in the Ross Sea (Subareas 88.1 and 88.2A South of 70°s) Antarctic toothfish (Dissostichus mawsoni) exploratory longline fishery
Abstract: Catch rates or catch per unit of effort (CPUE) are used for data-poor exploratory ... interim of collecting sufficient tag recaptures. Here, we address the two questions: (1) which unit of ... such as gear type, vessel, fishing season, month, bait, fishing depth and area affect estimates of ... trend and magnitude of catch rates. Using data from the Ross Sea Antarctic toothfish fishery, we ...
Meeting Document : WG-SAM-2019/25 : Autor(es): D. Maschette, S. Wotherspoon and P. Ziegler
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A comparison of densities and length distribution of the Champsocephalus gunnari stock in Subarea 48.3 between years 1994 and 1995
Abstract: Mean densities and length structure of Champsocephalus gunnari obttained in the 1994 ... determined by a search procedure yielding randomly selected clusters of stations located within the 50–150 ... design. Forty five stations in the first cruise and 48 in the second were analyzed. Of these, 51 pairs of ... depth strata in the South Georgia Islands shelf, while density remained stable at Shag Rocks. The fit of ...
Meeting Document : WG-FSA-95/34 : Autor(es): Marschoff, E., Calcagno, J., Gonzalez, B.
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By-catch of juvenile Champsocephalus gunnari in krill fishery on the shelf of South Georgia Island
Abstract: AtlantNIRO had conducted in 1982-1990 a series of juvenile fish trawl surveys of ... abundant species around South Georgia Is. Results of these survey were summarised and compared with ... published data. Juveniles of Champsocephalus gunnari were found to be distributed from the surface to 500 m ... depth with a maximum density observed at depth between 100 and 200 m. High catches of C. gunnari ...
Meeting Document : WG-FSA-92/06 : Autor(es): G.A. Frolkina, V.I. Latogursky, V.A. Sushin (Russian Federation)
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The distribution pattern and fishery for the Antarctic krill (Euphausia superba) off the Wilkes Land and Balleny Islands (with notes on the application of CPUE data as indices of krill abundance)
Abstract: Hydrological conditions, the distributiion pattern of krill and characteristics of the ... variability of some CPUE indeces (TC/TH/PPST; TC/TFISHT; TC/TFISHT/PPST) is analysed on the basis of data ... °- 150° E) are likely to be. an area of regular occurence of krill concentrations, probably the frequency ... of their occurence is the highest in the whole East Indian and West Pacific Anrarctic. This seems to ...
Meeting Document : WG-KRILL-90/16 : Autor(es): V.N. Dolzhenkov, E.A. Kovalev, V.A. Spiridonov, V.P. Timonin, I.A. Zhigalov (USSR)
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Alternative method of the age composition assessment on the basis of surveys length data using mixture distributions
Abstract: On the basis of the bottom trawl surveys carried out by Russia and Great Britain during ... bootstrap method result in different estimates of mean fish density in the length series. Verification of ... the hypothesis of non-zero observations lognormal distribution for a large number of length groups ... casts doubt on the correctness of the first method application and therefore also of the method by de la ...
Meeting Document : WG-FSA-05/78 : Autor(es): P. Gasyukov (Russia)
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Review of biological characteristics of the Antarctic toothfish (Dissostichus mawsoni) and its distribution in Antarctic waters
Abstract: Results of published studies on the biology, biomass and distribution of the Antarctic ... toothfish (Dissostichus mawsoni) were reviewed. The review focused on those aspect of the species which are ... of importance for the assessment of its biomass and identification of its stocks. The trophodynamics ... of D. mawsoni are mentioned only in brief. Most published materials refer to studies conducted in the ...
Meeting Document : WG-FSA-98/37 : Autor(es): Secretariat
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Models of tag shedding for double tagging as a function of time at liberty and approximate solutions for the single tagging model in CASAL
Abstract: The model of tag shedding implicit in CASAL is that of Kirkwood and Walker (KW) (1984 ... present to correctly apply the KW model for fish released with two tags. The solution of Dunn et al. (2005 ... ) and Hillary et al. (2006) to apply the square of the individual tag loss annual rate in CASAL over ... -estimates the correct proportion of fish that have retained at least one tag, and are therefore detectable ...
Meeting Document : WG-SAM-11/12 : Autor(es): S.G. Candy (Australia)
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PRELIMINARY REPORT OF THE NEW ZEALAND RV TANGAROA IPY-CAML SURVEY OF THE ROSS SEA REGION, ANTARCTICA IN FEBRUARY-MARCH 2008
Ross Sea region in support of the International Polar Year Census of Antarctic Marine Life (IPY-CAML ... ). The 50 day voyage on the research vessel Tangaroa involved an extensive survey of marine organisms ... from viruses to pelagic and demersal fish and cephalopods from the surface down to depths of 3500 m ... , and from the continental shelf and slope of the Ross Sea to unexplored seamounts and abyssal plains ...
Meeting Document : WG-EMM-08/18 : Autor(es): S.M. Hanchet, J. Mitchell, D. Bowden, M. Clark, J. Hall, R. O’Driscoll, M. Pinkerton and D. Robertson (New Zealand)
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Evidence of two stocks of Champsocephalus gunnari in the South Georgia region, CCAMLR fishing Area 48.3
Abstract: In 1991, the 0 age-class of C. gunnari were sampled at Shag Rocks on 18 January, off ... Possession Bay, South Georgia during 19-20 January and off much of the north-east coast of South Georgia ... between to 19 January to 19 February. The size- frequency of fish at Shag Rocks contained two modes of 31 ... -46mm and 55-87mm SL. however, off Possession Bay only one mode of 25-57mm SL was apparent. Fish in ...
Meeting Document : WG-FSA-94/16 : Autor(es): A.W. North (United Kingdom)
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Estimation of the biomass of krill in Prydz Bay during January/February 1991, February/March 1992 and January/ February 1993 using echo integration
Abstract: Hydroacoustic surveys of the abundance of krill (Euphausia superba) in the Prydz Bay ... surveys indicated some association of krill with the shelf break in the western part of the survey area ... and the centre of the Prydz Bay region but also found that the shelf break was in general not a region ... of relatively high krill abundance. The mean surface density estimates of krill in 1991, 1992 and ...
Meeting Document : WG-Krill-94/21 : Autor(es): T. Pauly and I. Higginbottom (Australia)