Search results

1. Acoustic discrimination of southern ocean zooplankton

   between mean volume backscattering strength at 38, 120 and 200 kHz separated echoes originating from each ... between mean volume backscattering strength at 38, 120 and 200 kHz separated echoes originating from each ...

   Meeting Document : WG-EMM-97/54 : Author(s): Watkins, J.L., Brierley, A.S., Goss, C., Ward, P.

2. Results of trials undertaken around Crozet Island using pots to target Patagonian toothfish

   comparison are not straightforward due to the large number of pot model tested and the large differences in ... Abstract:  Patagonian toothfish (Dissostichus eleginoides) is the target species of a bottom ... longline fishery occurring in the Southern Indian Ocean off Kerguelen and Crozet islands. This fishery is ... exposed to high levels of interactions with cetaceans removing fish from the fishing gear and to ...

   Meeting Document : WG-FSA-10/10 : Author(s): N. Gasco, P. Tixier and C. Guinet (France)

3. WG-CEMP-90

   . Vergani (Argentina) WG-CEMP-90/09 Optimization of the sampling design in the detection of interannual ... variability and prey size selectivity in the diet of penguins E. Marschoff and B. Gonzalez (Argentina) WG-CEMP ... production, krill distribution and predator foraging in the vicinity of Elephant Island during the 1989-90 ... in support of the CCAMLR Ecosystem Monitoring Program Delegation of the United States WG-CEMP-90/23 ...

   Meeting

4. Length-based assessment for mackerel icefish (Champsocephalus gunnari) at South Georgia

   - strapped across hauls but within regions to obtain mean and variance estimates for the survey den- sity ... by length bin and region. A population length frequency was then derived by taking a weighted mean ... = å å  . (1) These re-weighted data were then bootstrapped across all regions and hauls to obtain the mean Hillary ... - at-length (mean and standard error) as derived from the re-weighted survey data using the non- stratified ... accurate identification of age cohorts from the survey data. In this paper a length-based approach is ... data which, in conjunction with the bootstrapped survey biomass data, yields an estimate of the ... (Champsocephalus gunnari) in Subarea 48.3 employs the CCAMLR mixture analysis program (CMIX) and generalised yield ... described that removes the problem of cohort determination. A bootstrap technique (consistent with the ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 129–137 : Author(s): Hillary, R.M., C.T.T. Edwards, R.E. Mitchell and D.J. Agnew

5. Comparison of equal-area cylindrical and circular piston transducers

   Abstract:  Design of sondes for in situ measurement of zooplankton or other scatterers requires ... choosing among alternative transducer geometries. This contribution addresses the problem of choosing ... between cylindrical and circular piston transducers by comparing the performance of the two according to ... dimensions of six fabricated cylindrical transducers, whose beam patterns have been measured by the ...

   Meeting Document : WG-EMM-95/08 : Author(s): Foote, K.G.

6. Towards a strategic framework for assessing uncertainty in ecosystem dynamics models: objectives are sensitive too

   advice each required values for 2,311 distinct inputs. In the absence of guidance about management ... reference points, the modellers provided advice in terms of 41 illustrative reference points intended to ... candidate feedback management approaches for the Antarctic krill fishery in the southern Drake Passage and ... simulations of krill, its predators and fishery. It has been used to provide advice on the spatial allocation ...

   Meeting Document : WG-EMM-12/20 Rev. 1 : Author(s): S. Hill and J. Matthews (United Kingdom)

7. A distribution-free model of length-frequency distribution to inform fishery stratification for integrated assessments

   significantly influence the LFD helps in evaluating how to account for important differences in availability and ... /or gear specific selectivity. A distribution-free model of LFD is described which is fitted to the ... set of length quantiles L for a predetermined set of corresponding probabilities P (in this instance ... 0.05, 0.1 to 0.9 in 0.1 increments, and 0.95), constructed from individual length measurements of ...

   Meeting Document : WG-SAM-13/18 : Author(s): S. Candy, P. Ziegler and D. Welsford (Australia)

8. Application of continuous time Markov chains to modelling animal movement: estimation of movement rates and retention times for Patagonian toothfish

   Abstract:  The study of animal movement and distribution has been a central focus in ecology since ... apply the model to estimate the equilibrium distribution of Patagonian toothfish in the region around ... the inception of the science. However, continuous-time, discrete state models have received relatively ... Heard and MacDonald Islands in the Australian Antarctic zone using to mark-recapture data from the ...

   Meeting Document : WG-FSA-SAM-06/16 : Author(s): C. Wilcox, M. Bravington and D. Peel (Australia)

9. BEACH DEBRIS SURVEY AND INCIDENCE OF ENTANGLEMENT OF ANTARCTIC FUR SEALS ARCTOCEPHALUS GAZELLA AT SIGNY ISLAND, SOUTH ORKNEY ISLANDS 2007/2008

   ). There was a decrease in the number of plastic packaging bands with only two found in the current season ... (both of which had been cut open), marking a break in the otherwise continued rise in packaging bands ... the longevity of plastics and other materials with a high resistance to degradation in the marine ... Abstract:  This report details the twelfth annual survey of the incidence of entanglements of ...

   Meeting Document : WG-FSA-08/26 : Author(s): M.J. Dunn and C.M. Waluda (UK)

10. Proposal for a mark–recapture experiment to estimate toothfish population size in Subarea 48.4

    Abstract:  One UK vessel fished around the South Sandwich Islands (Subarea 48.4) in in July, 2005 ... programme to assess the toothfish population. Catch rates were similar to those experienced in Subarea 48.3 ... . The UK proposes to undertake a more extensive mark-recapture experiment in Subarea 48.4 over the 2006 ... – 2007 fishing seasons. The objective of the experiment will be to assess toothfish population structure ...

    Meeting Document : WG-FSA-05/57 : Author(s): Delegation of the United Kingdom

Pages