Résultats de la recherche

1. Further development of coarse- and medium-scale spatially explicit population dynamics operating models for Antarctic toothfish in the Ross Sea region

   proportions-at-age observations were generally good in most models, although fits to the plus group of the ... proportions-at-age catch data were less than ideal. Model estimates of proportions-mature appeared to be ... program allows implementation of an aggregate movement model for use with large numbers of areas as a ... mortality), as well as movement processes defined as the product of a set of preference functions that are ...

   Meeting Document : WG-FSA-12/44 : Auteur(s): S. Mormede, A. Dunn, S. Parker and S. Hanchet (New Zealand)

2. Ecosystem indicators: factors affecting the choice of predator performance indices for use in monitoring programmes

   the ability to relate changes in indices of their performance to changes at lower trophic levels ... . Using indices of predator performance from four species of krill-eating predator together with ... independent ship-based acoustic estimates of krill abundance from South Georgia the relationship between a ... range of indices of predator performance and krill abundance was examined. There was a distinct ...

   Meeting Document : WG-EMM-03/43 : Auteur(s): K. Reid (United Kingdom)

3. Krill distribution variability and fishery conditions within the local ground of Subarea 48.3 in June 1991

   the period of observations (29.05.91–03.06.19) at variable krill distribution characteristics due to ... coefficient of possible catch per fishing day (over 24 hours) is only V = 0.13. At considerable variations of ... Abstract:  Experiments on estimation of krill transport by a current and its distribution ... characteristics variability were carried out within a local ground of Subarea 48.3 in the fleet operation area. It ...

   Meeting Document : WG-EMM-95/04 : Auteur(s): Kasatkina, S.M.

4. Acoustic data analysis and models of krill spatial distribution

   biomass estimate. The wavenumber spectrum resembles a white noise at scales of 2-20 km, although at scales ... used in three descriptors of krill spatial aggregation: power spectra for krill biomass fluctuations in ... space, semivariogram (spatial autocorrelation of krill biomass) and the frequency distribution of krill ... smaller than 1 km the spectrum appears to lose its power significantly. The semivariance of biomass does ...

   Meeting Document : SC-CAMLR-VII/BG/25 : Auteur(s): United States of America

5. Investigating the uncertainty of age determinations for Patagonian toothfish (Dissostichus eleginoides) and the implications for stock assessment

   (misclassification matrix) to address some issues regarding true ages not being the mode at the extremes of the ... a poor representation of the observed ages, underestimating the variability at the younger age ... classes and over estimating the variability at the older age classes. Estimates of SSB were similar for ... Abstract:  We revised the method of Candy et al. (2012) to estimate the ageing error matrix ...

   Meeting Document : WG-FSA-14/46 : Auteur(s): P. Burch, P. Ziegler, W. de la Mare and D. Welsford (Australia)

6. Performance of an acoustic sonde design

   is widely recognized. At a U.S. GLOBEC workshop in 1991, one of the considered problems was measuring ... Abstract:  The potential of multi-frequency acoustic technology for quantifying fish and plankton ... would be expedient to use at least three and perhaps as many as 8-10 frequencies in the range 38-420 kHz ... frequencies are chosen. Each frequency represents the resonant condition of a circular piston transducer with ...

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

7. Cetaceans as indicators of historical and current changes in the East Antarctica ecosystem

   minke whale, resulting in a decreasing trend in the age at sexual maturity of this species between ... the stable trend of age at sexual maturity and recruitment after 1970’s. The stable trend in ... factors. This paper reviews the scientific information of whales that could be indicative of changes in ... the East Antarctica ecosystem in the context of two hypotheses, the ‘krill surplus’ hypothesis in the ...

   Meeting Document : WG-EMM-16/64 : Auteur(s): Y. Fujise and L.A. Pastene

8. Foraging of royal albatrosses, Diomedea epomophora, from the Otago Peninsula and its relationship to fisheries.

   system (GPS) loggers. Birds favoured areas around the shelf break of the eastern New Zealand continental ... mass, with hot spots of activity that coincided with fishing zones actively exploited by commercial ... fishing events, showing reduced speed and more direct flight when at moderate distances from fishing ... operations (12.5 – 25 km) than at greater distances. This relationship was significant for speed only (P ...

   Meeting Document : WG-FSA-05/P4 : Auteur(s): Davis, L., Setiawan, A., Higuchi, H., Suzuki, M., Fukuda, A., Filippi, D., Waugh, S.

9. Horizontal and vertical distribution and demography of euphausiids in the Ross Sea and its adjacent waters in 2004/2005

   Abstract:  The horizontal and vertical distribution and population structure of euphausiids in the ... Ross Sea and its adjacent waters were investigated during the summers of 2004/2005 using stratified ... towed samples. Nine species of euphausiids occurred in the survey area. Among them, Euphausia triacantha ... was dominant in biomass north of the southern boundary of the Antarctic circumpolar current (SB ...

   Meeting Document : WG-EMM-08/P10 : Auteur(s): K. Taki, T. Yabuki, Y. Noiri, T. Hayashi and M. Naganobu

10. Age estimation and maturity of the ridge-scaled macrourid (Macrourus whitsoni) from the Ross Sea

    0.159 for females. Revised estimates of the mean total length–at– maturity (38.8cm, 46.4cm) and mean age ... Abstract:  Juveniles of the macrourid rattail Macrourus whitsoni were collected by the NIWA ... research vessel Tangaroa during the BioRoss survey of the Western Ross Sea and Balleny Islands, with the ... purpose of analyzing the otoliths to generate more accurate age estimates for this species. Intensive ...

    Meeting Document : WG-FSA-05/20 : Auteur(s): P.M. Marriott, M.J. Manning and P.L. Horn (New Zealand)

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