Résultats de la recherche
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A von Bertalanffy growth model for Division 58.5.2 fitted to length-at-age data and a comparison of predicted with observed growth from mark–recapture data
variable probability (VP) sampling of fish that were aged. Sub-sampling of random length frequency (LF ... ) data used to obtain the samples of fish for ageing used length-bin sampling involving a fixed sample ... size per bin. Estimation of the VB parameters used a definition of the maximum likelihood which took ... into account VP sampling due to length-dependent selectivity of trawl fishing and also accounted for ...
Meeting Document : WG-FSA-SAM-06/07 : Auteur(s): S.G. Candy, A.J. Constable, T. Lamb and R. Williams (Australia)
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Preliminary examination of otolith microchemistry to determine stock structure in Antarctic toothfish (Dissostichus mawsoni) between SSRU 88.1C and 88.2H
Abstract: Life history characteristics of Antarctic toothfish (Dissostichus mawsoni), were ... concentrations in the otolith edge and then to (ii) assess the potential of natal signatures to distinguish ... shown. This resulted in the correct classification of 63% of fish overall to their original capture ... sites. Discrimination of otolith natal signatures using Al:Ca and Zn:Ca showed greater classification ...
Meeting Document : WG-SAM-14/33 : Auteur(s): R. Tana, B.J. Hicks, C. Pilditch and S.M. Hanchet (New Zealand)
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Proposed continuation of a multi-Member longline survey on Antarctic toothfish (Dissostichus mawsoni) in Statistical Subarea 48.6 in 2019/20 by Japan, South Africa and Spain
assessments of the D.mawsoni stock in this subarea (FSA-18/34). The continuation of the three-member research ... proposal for 2019/20 season is presented to ensure continuity of previous research activities. Data and ... investigations about the population structure and various demographic parameters of Antarctic toothfish ... techniques, pop-up tags and genetic analysis will provide the basis for the development of spatial population ...
Meeting Document : WG-SAM-2019/13 Rev. 1 : Auteur(s): Delegations of Japan, South Africa and Spain
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Engaging ‘the crowd’ in citizen science and remote sensing to learn about habitat affinity of two Southern Ocean seals
presence/absence patterns of the Weddell seal (Leptonychotes weddellii), and has recently been adapted for ... efficient method to screen large numbers of images (and hence area) for undertaking census counts of Weddell ... images of the pack ice acquired during October 2018 in the Weddell Sea to identify presence/absence of ... 852 VHR images, composed of a series of tiles called “maps”, across both campaigns. The circum ...
Meeting Document : WG-EMM-2019/37 : Auteur(s): M.A. LaRue, D.G. Ainley, J. Pennycook, K. Stamatiou, M. Dozier, J. Saints, L. Sales, N. Nur, S. Stammerjohn and L. Barrington
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Species profile of mackerel icefish (Champsocephalus gunnari)
and became the target species of fisheries in many parts of the low-Antarctic from 1975 to 1990 ... . Exploitation has been limited to South Georgia and Heard and McDonald Islands since the second half of the 1990 ... ’s with annual catches of a few thousand tonnes in each of the two areas. Aspect of the biology and ... exploitation of the species have been summarized in Kock and Everson (2003) and Kock (2005). Additional ...
Meeting Document : WG-FSA-07/12 : Auteur(s): K.-H. Kock (Germany) and I. Everson (UK)
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On the problem of icefish (Champsocephalus gunnari) (Channichthyidae) and krill (Euphausia superba) interaction in the South Georgia area
Abstract: The interaction of icefish and krill in the South Georgia area has been analysed on the ... basis of the trawling, acoustic and juvenile fish surveys carried out by AtlantNIRO during 1986-2002 and ... the data of the national fishery. It is demonstrated that?.gunnari both at the early development ... stages and as adults utilize the pelagic forage resource, the bulk of which is constituted by krill. At ...
Meeting Document : WG-FSA-04/41 : Auteur(s): S.M. Kasatkina and Zh.A. Frolkina (Russia)
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Comparison of temperature situation near South Georgia in December–February, 1989–1990, 1990–1991, 1999–2000 and 2000–2001 on satellite data and information about krill catches in Subarea 48.3
Abstract: Monitoring of the sea surface temperature (SST) in Subarea 48.3 on satellite data (GOES ... -E, Meteosat), use of in situ data and the further analysis of the SST maps, maps of the SST ... survey area. Analysis of this situation based on data obtained in expeditions, as well as literature and ... the CCAMLR materials could allow us to assess, with a certain degree of reliability, a potential ...
Meeting Document : WG-EMM-01/11 : Auteur(s): G. Vanyushin (Russia)
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Evaluating the impact of multi-year research catch limits on overfished toothfish populations
Abstract: In stocks that have been depleted by overfishing, the benefits of additional fisheries ... delaying the recovery of such stocks. Through simulating a Dissostichus eleginoides stock that has been ... subjected to varying levels of overfishing and research catches, this study show that stocks can take ... decades to recover even in the absence of fishing, and apparently low levels of research catches can ...
Meeting Document : WG-FSA-10/42 Rev. 1 : Auteur(s): D.C. Welsford (Australia)
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Effects of recruitment variability and natural mortality on Generalised Yield Model projections and the CCAMLR Decision Rules for Antarctic krill
;vector of recruitments" input option to simulate the population dynamics of krill in the Antarctic ... Peninsula region (Subarea 48.1) under various assumptions. The annual proportions of krill less than 36 mm ... in length to the total captured in AMLR net samples in four sampling regions of the Antarctic ... between 14 and 45%) and "high mortality" (M = 3, annual survival of 5%). CVs of either 0, 10 ...
Meeting Document : WG-EMM-12/26 : Auteur(s): D. Kinzey, G. Watters and C. Reiss (USA)
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Development of an algorithm designed to assess observer data quality and performance
Abstract: As part of the Secretariat task to ensure the quality and consistency of the data ... observers in their logbooks. A first version of the algorithm was tested on four randomly selected longline ... , as well as value inconsistencies through a limited set of logical tests. For each logbook inspected ... , a text report indicating the locations of faulty entries, a set of figures to display length and ...
Meeting Document : WG-SAM-13/40 : Auteur(s): Secretariat