Résultats de la recherche

1. Progress towards an assessment of Antarctic toothfish (Dissostichus mawsoni) in Subarea 88.2 SSRUs 882C–H for the years 2002/03 to 2017/18 using a two-area model

   88.2C–G) comprising a mix of large mature fish and small immature fish. Two-area stock assessment models ... collect mark-recapture data in the South to inform the estimation of biomass in the South. Simulation work ... models including data from four years of recapture data from the South. The assessment models were fit to ... size of the population in the south and migration rates between areas. Biomass estimates are in ...

   Meeting Document : WG-FSA-18/37 : Auteur(s): S. Mormede and S. Parker

2. A comparison of model predictions from KPFM1 and KPFM2

   Abstract:  We compare two versions of the krill-predator-fishery model to demonstrate the extent ... to which the predictions of KPFM1 can be reproduced with KPFM2. We also discuss the incorporation of ... seasonality into parameter estimates and a necessary change in the predator recruitment function of KPFM2 ... logic of KPFM2 have not caused substantial changes in model results. In essence, KPFM1 has become a ...

   Meeting Document : WG-EMM-06/20 : Auteur(s): J. Hinke, G. Watters (USA), S. Hill and K. Reid (United Kingdom)

3. Report on a random stratified trawl survey to estimate distribution and abundance of Dissostichus eleginoides and Champsocephalus gunnari conducted in the Heard Island region (Division 58.5.2), May–June 2006

   the abundance and size structure of Champsocephalus gunnari on the Heard Island Plateau This paper ... Abstract:  Random stratified trawl surveys (RSTSs) of the distribution and abundance of demersal ... in May-June 2006 had two main aims: • to assess the abundance and size structure of juvenile and ... adult Dissostichus eleginoides on the shallow and deep parts of the Heard Island Plateau.] • to assess ...

   Meeting Document : WG-FSA-06/42 Rev. 1 : Auteur(s): G.B. Nowara, R. Williams and T. Lamb (Australia)

4. Stratification of catch-at-length data using tree based regression: an example using Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea

   Abstract:  This paper presents a new approach to the stratification of catch-at-length data of ... offshore regions where only larger fish were found. The paper presents the new estimates of Antarctic ... sampled catch based on the median length of Antarctic toothfish for each set using the observer length ... frequency data. The median lengths were weighted within the regression by the inverse of the variance ...

   Meeting Document : WG-FSA-SAM-05/8 : Auteur(s): N.L. Phillips, A. Dunn and S.M. Hanchet (New Zealand)

5. Spectra analysis of Drake Passage Oscillation Index (DPOI) from 1952 to 2003, Antarctica

   Abstract:  An assessment of the environmental processes influencing variability in the recruitment ... and density of Antarctic krill (Euphausia superba DANA) is important as variability in krill stocks ... krill recruitment and density with hypothesized environmental factors; strength of westerly winds ... , Argentina, and Base Esperanza, at the tip of the Antarctic Peninsula, sea ice cover and chlorophyll-a in the ...

   Meeting Document : WG-EMM-04/46 : Auteur(s): M. Naganobu and K. Kutsuwada (Japan)

6. Genetic analysis of Antarctic toothfish samples from the Southern Ocean to explore potential stock boundaries

   restriction enzyme digests of nine sub regions of the mitochondrial genome. Polymorphisms were found in four ... out of seven introns digested with the restriction enzymes, but there was no population ... differentiation among the three sea areas. While direct sequencing of cytochrome b (665 base pair) showed ... virtually no variation, sequences for ~600 bp of the left domain of the control region showed nucleotide ...

   Meeting Document : WG-FSA-04/32 : Auteur(s): P.J. Smith, S.M. McVeagh (New Zealand) and P.M. Gaffney (USA)

7. Behaviour of Dissostichus eleginoides fitted with archival tags at Heard Island: preliminary results

   Abstract:  Thirty nine Dissostichus eleginoides were released in the vicinity of Heard Island ... data they recorded is analysed here. Most of the fish had periods of active vertical movement ... alternating with periods of relative inactivity, loosely correlated with moon phase. The direction of vertical ... bottom of a valley only moving upwards from their resting depth, while those on the intervening ...

   Meeting Document : WG-FSA-02/60 : Auteur(s): R. Williams and T. Lamb (Australia)

8. Acoustic estimates of krill density at South Georgia during 11 austral summers between 1981 and 1998

   Abstract:  Acoustic estimates of densities of Antarctic krill, Euphausia superba, at South Georgia ... and 1994 austral summer seasons were characterised by particularly low abundances of krill. For five ... of the summers between 1990 and 1998 it was possible to calculate separate density estimates for ... north-eastern and north-western ends of South Georgia. In four of these years density was higher to the ...

   Meeting Document : WG-EMM-98/51 : Auteur(s): A.S. Brierley, J.L. Watkins, C. Goss, M.T. Wilkinson and I. Everson (UK)

9. The Ross Sea toothfish fishery: proposal for conditional transition of classification from exploratory to established

   CCAMLR as an exploratory fishery since 1998.  The current classification of this fishery as ‘exploratory ... a rigorous assessment of the stock status and estimation of long-term precautionary yield has yet to ... be undertaken.  In fact, many biological characteristics of D. mawsoni are now well understood, and ... uncertainties with aspects of the stock, we propose that the stock is sufficiently well understood and assessed ...

   Meeting Document : WG-FSA-11/32 : Auteur(s): C. Jones (USA) and S. Hanchet (New Zealand)

10. Performance of an acoustic sonde design

    Abstract:  The potential of multi-frequency acoustic technology for quantifying fish and plankton ... is widely recognized. At a U.S. GLOBEC workshop in 1991, one of the considered problems was measuring ... frequencies are chosen. Each frequency represents the resonant condition of a circular piston transducer with ... 10-deg beamwidth. The performance of this system is assessed through the maximum detection range of ...

    Meeting Document : WG-EMM-95/09 : Auteur(s): Foote, K.G.

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