Search results
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Fishery selection for Patagonian toothfish in CCAMLR Subarea 48.3, asymptotic or dome shaped?
waters as they age and increase in size and, in combination with the practical difficulties associated ... with deploying fishing gear at increasing depths, there is the potential for a dome shaped selection ... with age and size to arise. However this type of selection pattern is associated with the estimation of ... age with depth, is suggested as an indicator that a dome selection pattern is unlikely in the 48.3 ...
Meeting Document : WG-SAM-15/29 : Author(s): C. Darby, V. Laptikhovsky and M. Soeffker (United Kingdom)
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MULTIPLE TIME SCALES OF VARIABILITY IN THE KRILL POPULATION AT SOUTH GEORGIA
conducted in the early, middle and late period of the summers of 2001 to 2005, together with krill ... population size structure over the same period from predator diet data, were used with a krill population ... latter there was evidence that krill recruitment was delayed by several months. A model scenario with ... correlation with the acoustic series. The results are consistent with a krill population with allochthonous ...
Meeting Document : WG-EMM-08/48 : Author(s): K. Reid, J. Watkins, E. Murphy, P. Trathan, S. Fielding and P. Enderlein (United Kingdom)
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Influence of the quality and quantity of data from a multi-year tagging program on bias and precision of biomass estimates from an integrated stock assessment – update
. Biomass estimates generally improved with more and better quality tagging data, however important nuances ... with a low tag size-overlap, even with large numbers, is likely to result in overestimates of biomass ... and the resulting data should not be used in stock assessments with only few years of data available ... . In contrast, with a 100% tag size-overlap even low numbers of releases and subsequent recaptures ...
Meeting Document : WG-FSA-12/18 : Author(s): P.E. Ziegler (Australia)
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Results of the groundfish survey carried out in CCAMLR Subarea 48.3 in January 2010
48.3 on the FV Sil. Seventy-five random hauls were completed with good coverage across the shelf ... , representing an increase in effort overall compared with surveys carried out in 2008 and 2009 on the same ... mean biomass of 52,329 tonnes was estimated for mackerel icefish, with a lower 1-sided 95% CL of 24,334 ... , but still low compared with historical survey catches. There was however, the first evidence since ...
Meeting Document : WG-FSA-10/38 : Author(s): R.E. Mitchell, M. Belchier, S. Gregory, L. Kenny, J. Nelson, J. Brown and L. Feathersone (UK)
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Trade data analysis – Annual report of global toothfish trade data
forms with mean unit values of 24.03 US$/kg for imports and 23.40 US$/kg for exports. The data ... importer, with 28.33% of global imports. France was estimated to be the largest exporter, with 18.61% of ... between global trade data and the CDS found that they are similar for imports with a 4.43%, but vastly ... different for exports with a 32.34% difference. Author(s): CCAMLR Secretariat Title: Trade data analysis ...
Meeting Document : CCAMLR-38/BG/09 : Author(s): CCAMLR Secretariat
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On the possibility of practical utilisation of krill target strength TS in situ obtained on the basis of EK-500 measurements
Abstract: Comparative analysis of krill length distribution in the echosurvey area, obtained with ... situ at the frequency of 120 kHz as measured with echosounder EK-500 (split-beam) principle). Krill was ... caught with the commercial trawl RT 741448. It was shown that differences between krill length ... considerable (statistically significant). Besides, krill length estimates, obtained with acoustic method, were ...
Meeting Document : WG-EMM-98/19 : Author(s): S.M. Kasatkina (Russia)
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Modeling the growth dynamics of Antarctic krill
in the current literature. The model was forced with an environmental time series of food (pelagic ... time series were created to represent high, low, and intermediate food conditions with the high and low ... . Simulated growth rates during the spring and summer for all size classes were consistent with published ... that were consistent with observations of experimentally starved individuals. the annual change in ...
Meeting Document : WG-EMM-96/68 : Author(s): Lascara, C.M., Hofmann, E.E.
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Long-term changes in the size composition of fjord Notothenia rossii, Gobionotothen gibberifrons and Notothenia coriiceps at Potter Cove, after the 1978–1980 fishery in the area
lengths and density distributions of the commercially exploited species N. rossi and G. gibberrifrons with ... reported for the period 1983- 1991/2 is consistent with the increase in mean size observed between 1983 and ... the following years, until 1991/92, the decreasing abundance is consistent with the entrance of low ... strength cohorts with the consequent reduction in mean size. The above interpretation is supported by the ...
Meeting Document : WG-FSA-07/52 : Author(s): E.R. Marschoff, E.R. Barrera-Oro and N.S. Alescio (Argentina)
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Physical forcing in the southwest Atlantic: ecosystem control
temperature at South Georgia shows the presence of high levels of autocorrelation, with periodicity evident in ... temperature anomalies at lag periods of approximately 3 to 4 years. Crosscorrelation analyses with temperature ... temperature fluctuations in the Pacific, with the Pacific leading South Georgia by approximately 3 years ... as well as in data from fish and Antarctic krill. Increased krill biomass appears to coincide with ...
Meeting Document : WG-EMM-04/34 : Author(s): P.N. Trathan, E.J. Murphy, J. Forcada, J.P. Croxall, K. Reid and S.E. Thorpe (United Kingdom)
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Comparison between the CCAMLR-2000 and KY 1988 surveys on environmental variability of krill in the Scotia Sea, Antarctica
) distribution with comparison between the CCAMLR 2000 Survey and similar scale datasets partially by the ... differences between the 2000 and 1987/88 Surveys with regard to sea ice extent, oceanographic structure and ... the area of the Antarctic Surface Water, in 1987/88 extended northward with high density. In contrast ... , the distribution of krill in 2000 reduced southward with low density. To generally understand the ...
Meeting Document : WG-EMM-02/43 : Author(s): M. Naganobu (Japan), M. Brandon (United Kingdom), K. Ito, K. Segawa (Japan) and V. Siegel (Germany)