Résultats de la recherche
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Shedding new light on the life cycle of mackerel icefish in the Southern Ocean
Atlantic and Indian Ocean sectors of the low-Antarctic region. Biological characteristics differ ... after they have spawned for 2 – 3 times. The number of eggs produced per gram of body weight is higher ... in the north. Stocks have declined in most parts of the distributional range due to the impact of ... fishing and due to natural causes. Increases in populations of Antarctic fur seals at South Georgia and ...
Meeting Document : WG-EMM-03/4 : Auteur(s): K.-H. Kock (Germany) and I. Everson (United Kingdom)
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First Annual Report of the CCAMLR Otolith Network, 2002
Abstract: This report presents results from the first exchange of otoliths under the auspices of ... , from 23 to 27 July 2001. The National Institute of Water and Atmospheric Research, Nelson, New Zealand ... ; Central Ageing Facility, Victoria Australia; and CQFE, each provided a sample of otoliths, processing and ... reading one randomly chosen otolith from each pair. Half of the remaining otoliths were sent to each of ...
Meeting Document : WG-FSA-02/51
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Growth of Antarctic krill Euphausia superba at South Georgia
Abstract: Antarctic krill Euphausia superba has a central role in the ecosystem of the Southern ... Ocean and knowledge of its growth rate is central to determining the factors influencing population ... dynamics. The length of Antarctic krill in the diet of Antarctic fur seals Arctocephalus gazella at South ... Antarctic Peninsula region. The effect of geographical variation in growth rate on the population structure ...
Meeting Document : WG-EMM-01/18 : Auteur(s): K. Reid (United Kingdom)
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Environmental response of upper trophic level predators reveals a system change in an Antarctic marine ecosystem
environment have significant potential to affect populations of Antarctic krill Euphausia superba, a keystone ... Georgia. Indices of population size and reproductive performance showed declines in all species and an ... increase in the frequency of years of low reproductive output. Changes in the population structure of krill ... , and its relationship with reproductive performance, suggest that the biomass of krill within the ...
Meeting Document : WG-EMM-01/21 : Auteur(s): K. Reid and J.P. Croxall (United Kingdom)
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Monitoring a marine ecosystem using responses of upper trophic level predators
Abstract: 1. This study examined the changing status of the marine ecosystem at the island of ... index (CSI). 2. Sensitivity analyses showed that missing values had a large effect upon the accuracy of ... the CSI but this effect was reduced if the individual variables were highly correlated. The level of ... correlation and proportion of missing values within the empirical data set were within the acceptable range ...
Meeting Document : WG-EMM-01/25 : Auteur(s): I.L. Boyd and A.W.A. Murray (United Kingdom)
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Estimation of the fishery–krill–predator overlap
Abstract: Work undertaken during the intersessional period has enabled better use of the krill ... fishery data, and a comparison between the three existing indices of fishery-krill-predator overlap used ... at nine levels of spatio-temporal resolution and using normal, exponential and uniform foraging ... the level of overlap in recent years (1995-98) than estimated with either the catch in the CPD or the ...
Meeting Document : WG-EMM-99/11 : Auteur(s): Secretariat
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Examination of the CCAMLR toothfish GLM
Abstract: Various elements of the Generalized Linear Model (GLM) used to standardise toothfish ... of 1992-1993 prosecuted by Russian vessels and the winter fishery of 1995 onwards prosecuted by other ... nationalities, coupled with the existence of the experimental fishery in 1994, lead us to suggest that future ... being no data for 1993, one of the most successful summer seasons. The relationship between CPUE and ...
Meeting Document : WG-FSA-98/35 : Auteur(s): G.P. Kirkwood and D.J. Agnew (United Kingdom)
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Preliminary assessment of toothfish in Subarea 48.3
Abstract: As with the 2009 assessment of Subarea 48.3, there is still uncertainty as to why there ... were high numbers of the 2001 cohort in commercial catches in 2009 onwards. It is likely that it is ... due to a combination of a strong 2001 cohort and a change in selectivity for the commercial fleet, but ... it has not been possible to determine the relative importance of each explanation. Median log-normal ...
Meeting Document : WG-FSA-11/33 Rev. 1 : Auteur(s): T. Peatman, R.E. Mitchell, G. Parkes and D.J. Agnew (United Kingdom)
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THE DIET OF THE ANTARCTIC TOOTHFISH IN THE ROSS SEA
Abstract: This brief review documents the species composition of prey consumed by the Antarctic ... by both frequency of occurrence and dry weight. P. antarcticum is 71% by occurrence and 89% by weight ... deep oceanic waters (60-70°S) north of the shelf break the diversity of pelagic and epipelagic fishes ... is low. Here the diet of D. mawsoni consists of relatively small squid of at least six different ...
Meeting Document : WG-EMM-09/16 : Auteur(s): J.T. Eastman and A.L. DeVries (USA)
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Effect of missing modes on calibration sphere target strengths (ICES CM 1996/b: 37, Fish Capture Committee)
Abstract: It has been suggested that modes of vibration of solid elastic spheres, such as those ... used in the calibration of echo sounder systems, can be affected by the manner of suspension. This ... hypothesis is investigated in the context of reported experimental calibration trials with the SIMRAD EK500 ... -diameter spheres composed of electrical grade copper and 33.2- and 38.1-mmdiameter spheres composed of ...
Meeting Document : WG-EMM-96/46 : Auteur(s): Foote, K.G.