Résultats de la recherche
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Assessment of fishing intensity of krill in Subarea 48.2 during the season of 1989/90
Abstract: The research performed was aimed at assessment of fishing fleet impact upon krill ... population during the months (December-March), being critical to dependent species. The results of fishing ... intensity estimation are presented on the basis of haul to haul commercial statistics for Russian fleet ... (data of 2900 trawlings are used) in the South Orkneys area during December 1989- March 1990. In the ...
Meeting Document : WG-EMM-97/51 : Auteur(s): Ivanova, V.I., Sushin, V.A., Kasatkina, S.M.
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The use of morphometric parameters for the determination of sex of Adelie penguins
Abstract: The ability to determine the sex of Adélie penguins by discriminant analysis of ... morphometric parameters was examined for breeding birds of known sex at Bechervaise Island near Mawson Station ... , Antarctica (latitude 67°36’S, longitude 62°53’E). It was found that 89 % of birds could be correctly sexed by ... , cubitocarpal) with the mean discriminant score of 55.39. Males have a higher score and females a lower one. The ...
Meeting Document : WG-CEMP-91/5 Rev. 1 : Auteur(s): K.R. Kerry, D.J. Agnew, J.R. Clarke and G.D. Else (Australia)
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Optimization of the sampling design in the detection of interannual variability and prey size selectivity in the diet of penguins
Abstract: Based on preliminary results of prey size in Adélie penguins, sampling designs intended ... for detection of interannual variations in prey mean sizes and penguin size related selectivity are ... analysed for the optimal allocation of observations at each level in nested designs. Recommended numbers ... for detection of interannual variability are obtained and a sampling protocol is suggested. A table of ...
Meeting Document : WG-CEMP-90/09 : Auteur(s): E. Marschoff and B. Gonzalez (Argentina)
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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
Abstract: By way of simulation, this study investigated how the bias and precision of biomass ... estimates from an integrated tag-based assessment are influenced by various aspects of a multi-year tagging ... program, in particular the effects of the size (tag size-overlap) and numbers of tagged fish, the duration ... of the tagging program, the type of auxiliary data used in the assessment, and the catch history ...
Meeting Document : WG-FSA-12/18 : Auteur(s): P.E. Ziegler (Australia)
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Results of the research fishing activities conducted by Chile in Management A of Subarea 48.3 from 2005–2008: the importance of conserving the big older fishes
Abstract: This research makes a contribution to the Agenda Item 8 of the WG-FSA. (Biology ... , ecology and demography of target and by-catch species) and shows the response of the local population of ... Dissostichus eleginoides (TOP) from the Area management A (subarea 48.3), after 4 year of closure (2004 to 2008 ... ). We noted an increase in the CPUE overtime, mainly associate with the increase in the median size of ...
Meeting Document : WG-FSA-10/35 : Auteur(s): C.A. Moreno and P. Rubilar (Chile)
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Modelling growth and reproduction of Antarctic krill: implications of spatial and temporal trends in temperature and food for ecosystem-based management of krill fisheries
Abstract: Errors in the growth model used in stock assessments of Antarctic krill, specifically ... higher rates of growth than occur in reality, could inadvertantly lead to over-exploitation of the krill ... population and cause impacts on krill predators. We review the three classes of models available for ... modelling krill growth – the von Bertalanffy class, the moult-cycle class based on measures of the duration ...
Meeting Document : WG-EMM-12/38 : Auteur(s): A.J. Constable and S. Kawaguchi (Australia)
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Comparison of the catches and biological characteristics of Dissostichus mawsoni in Subarea 88.1 in seasons of 2002/03 and 2003/04
Abstract: This report presents results of an exploratory fishery for Antarctic toothfish (D ... . mawsoni) conducted by the Russian vessels “Yantar” and “Volna” for two seasons of 2002/03 and 2003/04. The ... analysis of data collected relates to catch composition, effort, CPUE, and biological characteristics in ... different SSRU, month and depth of sets longlines. The comparison of these resultants showed that in the ...
Meeting Document : WG-FSA-04/84 Rev. 1 : Auteur(s): K.V. Shust, N.V. Kokorin and A.F. Petrov (Russia)
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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 ... trawl and acoustic methods is presented. Besides, the acoustic estimate of krill length composition was ... obtained on the basis of the empiric model by Greene et al. (1991) using estimates of target strength in ... situ at the frequency of 120 kHz as measured with echosounder EK-500 (split-beam) principle). Krill was ...
Meeting Document : WG-EMM-98/19 : Auteur(s): S.M. Kasatkina (Russia)
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Summary of a three year mark-recapture experiment to estimate population size of Antarctic toothfish (Dissostichus mawsoni) in Southern Area of Statistical Subarea 48.4
the aims of providing the data required for assessments of the population structure, size, movement ... and growth of both Patagonian toothfish (Dissostichus eleginoides) and Antarctic tooth (Dissostichus ... mawsoni) in South of Statistical Subarea 48.4. This paper presents the results for D. mawsoni. Fishing ... effort within the south of Subarea 48.4 was relatively evenly spread between each participating fishing ...
Meeting Document : WG-FSA-11/31 Rev. 2 : Auteur(s): R.C. Wakeford, J. Roberts and R.E. Mitchell (United Kingdom)
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Using vessel acoustics to detect diving patterns of krill foraging predators automatically: Development of a novel method for quantifying impact of krill fishing on seals and penguins
Abstract: The aim of this work was to assess the possibilities of automatically generating a ... dataset of dive behaviour of air-breathing predators, based on acoustic data from a monitoring survey and ... from commercial krill fishing operations. Our results documents that some form of automatic detection ... of diving predators in the data is feasible. A relatively low detection probability of our algorithms ...
Meeting Document : WG-EMM-15/25 : Auteur(s): T.A. Klevjer, O.R. Godø and B. Krafft (Norway)