Résultats de la recherche

1. How much is enough? analysis of the net sampling effort in the Elephant Island area necessary to adequately assess and describe krill and zooplankton assemblages during summer

   Abstract:  Data from 1995-1997 US Antarctic Marine Living Resources (AMLR) Program surveys in the ... interspecific relations of krill, salps and other macrozooplankton taxa in the Elephant Island area during ... summer months. Both parametric and nonparametric techniques are used. Between-survey and between-year ... comparisons are made to examine possible changes in sampling adequacy resulting from ecological changes ...

   Meeting Document : WG-EMM-97/32 : Auteur(s): Loeb, V.

2. Catch and effort data for the longline fishery in Subarea 48.3 – comparison of data reported to CCAMLR and data acquired by the UK between 1994 and 1996

   around South Georgia were compared with data reported to CCAMLR and held in CCAMLR's longline ... as single records. A number of hauls yielding zero catches present in the data acquired by the UK ... have not been reported to CCAMLR. In 1996 less than 10% of the hauls showed large discrepancies between ... in reporting bycatch and incidental mortality of birds. Author(s):  Parkes, G.B., Pearce, J., Agnew ...

   Meeting Document : WG-FSA-97/37 : Auteur(s): Parkes, G.B., Pearce, J., Agnew, D.J.

3. Rossii revisited: new information on the early history of the fishery for Notothenia rossii in Subarea 48.3

   in Subarea 48.3 from 1966- 197 1, rather than just 1970 and 197 1 as previously reported. Previous ... unrealistic stock history considering that this stock was the first to be exploited in the Antarctic. A VPA ... using the new data suggests that unexploited biomass was over 900 000 tonnes, and declined in a manner ... gunnari, rather than N. rossii, and that 25% of the catch in 1969 was also C. gunnari. A VPA run with ...

   Meeting Document : WG-FSA-95/17 : Auteur(s): Agnew, D.J.

4. A simulation study of the method of refining the natural mortality coefficient with Champsocephalus gunnari in Subarea 48.3 used as an example

   . As a result of this mathematical modelling study using C. gunnari in Area 48.3 as an example, it was ... shown that the proposed method facilitates such a refinement. When a mistake is made in the choice of ... natural mortality coefficient, the estimate of the free component in the equation will be other than zero ... . A bias in the estimate can be positive if the assumed natural mortality coefficient is less than the ...

   Meeting Document : WG-FSA-91/25 : Auteur(s): P.S. Gasiukov and R.S. Dorovskikh (USSR)

5. Approaches to monitoring and assessing toothfish in new and exploratory fisheries, with particular reference to Subarea 88.1

   and assessing toothfish in New and Exploratory fisheries. We review standardised CPUE analysis ... recapture experiments, or trawl surveys, be used in conjunction with experimental manipulation of effort to ... effort manipulation approach in all New and Exploratory fisheries, and in particular the current active ... monitoring and assessing toothfish in new and exploratory fisheries, with particular reference to Subarea ...

   Meeting Document : WG-FSA-SAM-04/08 : Auteur(s): ODriscoll, R.L., Hanchet, S.M.

6. Measures to avoid bias in abundance estimates of Dissostichus spp. based on tag-recapture data

   difficulty in accurately estimating key parameters, and consequently introduce bias into an abundance ... estimate. We also review the methods that have been used in CCAMLR tag recapture to program to mitigate ... against this bias, or to account for their effects in assessment models. In nearly all cases, examples of ... :  Measures to avoid bias in abundance estimates of Dissostichus spp. based on tag-recapture data Approval ...

   Meeting Document : WG-SAM-12/23 : Auteur(s): D.C. Welsford and P.E. Ziegler (Australia)

7. An initial analysis of data provided from the deployment of scientific observers in the krill fishery

   approach analysis on the other hand revealed the distribution of variance in krill length at different ... scales and indicated that krill hauled in a given month/season/area were similar enough to be pooled to ... variability in  krill length due to seasons, months and areas and this allowed estimates of variance ... for future sampling scheme, including the  potential for an adaptive responding to the variability in ...

   Meeting Document : WG-EMM-12/60 : Auteur(s): S. Thanassekos (CCAMLR Secretariat), S. Candy (Australia), E. Appleyard (CCAMLR Secretariat), S. Kawaguchi (Australia) and K. Reid (CCAMLR Secretariat)

8. Can acoustic methods be used to monitor grenadier (Macrouridae) abundance in the Ross Sea region?

   Abstract:  Grenadiers Macrourus spp. are the main bycatch species in the exploratory longline ... fishery for toothfish Dissostichus spp. in the Ross Sea, Antarctica. Ongoing monitoring tools are needed ... to assess stock status of grenadiers in the Ross Sea and to ensure ecological relationships are ... abundance. Acoustic data collected during New Zealand’s International Polar Year Census of Marine Life ...

   Meeting Document : WG-FSA-12/P11 : Auteur(s): R.L. O’Driscoll, S.M. Hanchet and B.S. Miller

9. Commercial fishing vessel as research vessels in the Antarctic – requirements and solutions exemplified with a new vessel

   Abstract:  The climate-induced changes presently seen in the ecosystems of Antarctic region ... require a precautionary approach with respect to the human use of these ecosystems. In particular ... the harvested stocks and their ecosystems. In this paper we describe the potential of using commercial ... fishing vessels to bridge the gap in research vessel capacity. The various tasks and required ...

   Meeting Document : WG-EMM-13/15 : Auteur(s): O.R. Godø (Norway), C. Reiss (USA), V. Siegel (Germany) and J.L. Watkins (United Kingdom)

10. Adélie penguin breeder abundance in CCAMLR Divisions 58.4.1 and 58.4.2

    future krill fisheries in those regions. We present here estimates of the breeding Adélie penguin ... population for Divisions 58.4.1 and 58.4.2 in east Antarctica. We estimated that around 1.31 million pairs of ... Adelie penguins were attempting to breed at the time of the surveys in Divisions 58.4.1 and 58.4.2. This ... estimate is substantially higher than the previously available estimate in Woehler (1993) of 767,000 ...

    Meeting Document : WG-EMM-13/09 : Auteur(s): C. Southwell, J. McKinlay, L. Emmerson (Australia), A. Takahashi (Japan), C. Barbraud, K. DeLord and H. Weimerskirch (France)

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