Résultats de la recherche
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Further development and progress towards evaluation of an Antarctic toothfish (Dissostichus mawsoni) stock model for the Ross Sea
Abstract: This report outlines the development of a Bayesian sex and age structured population ... model for the assessment of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea (Subareas 88.1 ... and 88.2), and initial progress towards evaluation of spatially explicit models. Three model scenarios ... either two or three discrete areas, with migrations of fish between areas. The 2-area model appeared to ...
Meeting Document : WG-FSA-SAM-05/12 : Auteur(s): A. Dunn, D.J. Gilbert and S.M. Hanchet (New Zealand)
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Preliminary analyses in support of the CEMP Review Workshop: power analyses
Abstract: A series of power (sensitivity) analyses of CEMP indices was made using the DOS-based ... change over the range –10% to +10% of a mean survey value. Each run of MONITOR involved the calculation ... of power for 3 survey scenarios and 3 alpha levels (0.05, 0.10 and 0.20). The 3 surveys scenarios ... were chosen to represent time series data from annual surveys conducted annually over periods of 5, 10 ...
Meeting Document : WG-EMM-03/26 : Auteur(s): Secretariat
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Ecological games in space and time: the distribution and abundance of Antarctic krill and penguins
Abstract: The distribution and abundance of organisms are affected by behaviors, such as habitat ... , environmental conditions, and the biology of the species involved. Although extensive theoretical work has ... explored predator–prey dynamics, these models have not considered the impact of behavioral plasticity and ... of a spatial, dynamic ecological game between predators and prey using a life-history perspective. As ...
Meeting Document : WG-EMM-03/33 : Auteur(s): S.H. Alonzo, P.V. Switzer and M. Mangel (USA)
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Can trace element signatures in the otoliths of Dissostichus eleginoides record capture size?
Abstract: The elemental structure of growth increments in the otoliths of fish reflects the ... composition of water passing across the gills: as a result, elemental signatures can potentially be used to ... reconstruct the environmental history experienced by fish. To test whether the otolith elemental signatures of ... from the outer edges (which are laid down during the interval leading to capture) of otoliths taken ...
Meeting Document : WG-FSA-03/88 : Auteur(s): J.R. Ashford and C.M. Jones (USA)
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Estimates of bird by-catch by IUU vessels in Subarea 48.3, 1998–2001
Abstract: Estimates of bird catches by IUU fishing made using the new method presented by Agnew ... and Kirkwood last year (WG-FSA-02/4 & 5) are updated to take account of the comments of the ... working group. Last year we suggested that the Isabel data from 1997 were rather atypical of bird catch ... by other vessels in 1997. Including the Isabel data and weighting the bootstrap estimates of bird ...
Meeting Document : WG-FSA-03/56 : Auteur(s): D.J. Agnew (United Kingdom)
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An Apparent Decrease in the Prevalence of “Ross Sea Killer Whales” in the Southern Ross Sea
occurrence patterns and diet of RS killer whales, and present new information on numbers observed in the ... large Antarctic toothfish (Dissostichus mawsoni), as the review herein demonstrates. On the basis of sea ... -effort of scientific fishing for toothfish in McMurdo Sound, we suggest and review evidence that the ... -driven, density-dependent northward contraction of the toothfish stock, and not to changes in the ...
Meeting Document : WG-EMM-09/P01 : Auteur(s): D.G. Ainley, G. Ballard and S. Olmastroni
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Catch and effort data for the longline fishery in Subarea 48.3 – comparison of data reported to CCAMLR and data acquired by the UK between 1994 and 1996
database (database C2). Some instances of incomplete reporting were identified, where blocks of data appear ... to be missing from the CCAMLR database. One instance was identified of multiple hauls being submitted ... as single records. A number of hauls yielding zero catches present in the data acquired by the UK ... have not been reported to CCAMLR. In 1996 less than 10% of the hauls showed large discrepancies between ...
Meeting Document : WG-FSA-97/37 : Auteur(s): Parkes, G.B., Pearce, J., Agnew, D.J.
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Winter gut contents of the Antarctic krill (Euphausia superba Dana) collected in the South Georgia area
Abstract: Foregut contents of the Antarctic krill Euphausia superba Dana which were collected in ... the South Georgia area in austral winter, 12 July ~ 4 August 1992 were observed. A total of 130 ... were examined in this study. The foregut contents of the krill consisted of various fragments of ... crustacean zooplankton in 77 individuals out of 130 examined. Among the fragments a portion of the pereiopods ...
Meeting Document : WG-KRILL-93/30 : Auteur(s): Y. Nishino and A. Kawamura (Japan)
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Stomach contents of Antarctic toothfish (Dissostichus mawsoni) from the Ross Sea region in 2010 and a comparison with 2003
Abstract: The stomach contents of 273 Dissostichus mawsoni captured by bottom longline in the ... in 640–2127 m depths and ranged between 78 and 181 cm TL. A total of 198 stomachs contained prey ... items, of which 13 contained only digested prey, leaving 185 stomachs for analysis. The majority of ... whitsoni) dominated the diet occurring in 37% of stomachs and accounting for 45% by weight and 52% by IRI ...
Meeting Document : WG-FSA-10/22 : Auteur(s): D.W. Stevens, J. Forman and S. Hanchet (New Zealand)
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Decadal trends in abundance, size and condition of Antarctic toothfish in McMurdo Sound, Antarctica, 1972–2011
Abstract: We report the analyses of a dataset spanning 39 years of near-annual fishing for ... unit effort (CPUE) were derived from the > 5500 fish caught, the large majority of which were ... measured, tagged and released. Contrary to expectation, the length frequency of the McMurdo Sound catch was ... dominated by fish in the upper two-thirds of the overall distribution exhibited in the industrial catch for ...
Meeting Document : WG-FSA-12/P04 : Auteur(s): D.G Ainley, N. Nur, J.T Eastman, G. Ballard, C.L Parkinson, C.W Evans and A.L. DeVries