Résultats de la recherche
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Behaviour of Dissostichus eleginoides fitted with archival tags at Heard Island: preliminary results
Abstract: Thirty nine Dissostichus eleginoides were released in the vicinity of Heard Island ... data they recorded is analysed here. Most of the fish had periods of active vertical movement ... alternating with periods of relative inactivity, loosely correlated with moon phase. The direction of vertical ... bottom of a valley only moving upwards from their resting depth, while those on the intervening ...
Meeting Document : WG-FSA-02/60 : Auteur(s): R. Williams and T. Lamb (Australia)
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The Ross Sea toothfish fishery: proposal for conditional transition of classification from exploratory to established
CCAMLR as an exploratory fishery since 1998. The current classification of this fishery as ‘exploratory ... a rigorous assessment of the stock status and estimation of long-term precautionary yield has yet to ... be undertaken. In fact, many biological characteristics of D. mawsoni are now well understood, and ... uncertainties with aspects of the stock, we propose that the stock is sufficiently well understood and assessed ...
Meeting Document : WG-FSA-11/32 : Auteur(s): C. Jones (USA) and S. Hanchet (New Zealand)
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Performance of an acoustic sonde design
Abstract: The potential of multi-frequency acoustic technology for quantifying fish and plankton ... is widely recognized. At a U.S. GLOBEC workshop in 1991, one of the considered problems was measuring ... frequencies are chosen. Each frequency represents the resonant condition of a circular piston transducer with ... 10-deg beamwidth. The performance of this system is assessed through the maximum detection range of ...
Meeting Document : WG-EMM-95/09 : Auteur(s): Foote, K.G.
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Preliminary results from CEMP monitoring of Antarctic fur seals, chinstrap penguins and macaroni penguins at Bouvetøya 1996/97
was established at the CEMP site, Nyrøysa, on the western coast of the island. Species included in the ... from the first season of CEMP monitoring (parameters A3, A4, A5, A6, A8, A9, C1 and C2) are reported ... together with results from other CEMP-re1ated work (entanglement of fur seals, and diving behaviour and ... population changes of penguins and fur seals). The population of Chinstrap Penguins at Nyrøysa has declined ...
Meeting Document : WG-EMM-97/20 : Auteur(s): Hofmeyr, G.J.G., Dyer, B.M., Næstvold, A., Mehlum, F., Gjertz, I., Bakken, V., Isaksen, K., Huyser, O.
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The foraging range of Adelie penguins – implications for CEMP and interactions with the krill fishery
Abstract: This paper presents a summary of the foraging locations of the Ad6lie penguin at 7 ... widely spaced locations along the coast of Eastern Antarctica between 55°E near Enderby Land and 175°E in ... and return with krill. The pattern of foraging is similar between sites. The potential for overlap ... not occur at these sites in normal ice years. It is suggested that an understanding of the potential ...
Meeting Document : WG-EMM-96/69 : Auteur(s): Rodary, D., Thomson, R., Tremont, R., Lawless, R., Gardner, H., Wienecke, B., Clarke, J.R., Kerry, K.R., Corsolini, S., Eberhard, S.
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Rossii revisited: new information on the early history of the fishery for Notothenia rossii in Subarea 48.3
assessments, based on the incomplete data set, had indicated a 1970 biomass of 600 000 tonnes and an ... to be expected from a new fishery. However, on the basis of historical reports and analyses of stock ... histories, it is suggested that 50% of the catch of 400 000 tonnes reported from 1970 was Champsocephalus ... gunnari, rather than N. rossii, and that 25% of the catch in 1969 was also C. gunnari. A VPA run with ...
Meeting Document : WG-FSA-95/17 : Auteur(s): Agnew, D.J.
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The preparation of recommendations and standard procedures for krill acoustic surveys
Abstract: Acoustic surveys are the most powerful tool of krill abundance estimation and ... and analysis. In the paper possibilities and approaches to preparation of recommendations for acoustic ... surveys of different scales (macro, meso, micro) are reviewed. It’s concluded that the most items of the ... of the recommendations to be prepared by international group of specialists. Author(s): W.D. Tesler ...
Meeting Document : WG-KRILL-93/5 Rev. 1 : Auteur(s): W.D. Tesler (Russia)
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A simple approach for calculating the potential yield of krill from biomass survey results
calculations is that the probability that the kri11 spawning biomass drops below 20% of its average pre ... -exploitation level over a 20 year period of harvesting should not exceed l0%. The value of λ depends strongly ... on the value of M (natural mortality) and σR (recruitment variability), and also on the relative ... values of the ages at maturity and first-capture. Seasonal effects seem to be of lesser importance ...
Meeting Document : WG-KRILL-91/24 : Auteur(s): D.S. Butterworth (South Africa) and M. Basson (United Kingdom)
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The Status of the Champsocephalus gunnari Stock in the South Georgia Area
the relationship between the spawning stock and number of recruits. A conventional VPA and an ad hoc ... . VPA-estimates of recruitment levels are used to investigate the degree of variability and the likely ... statistical distribution of recruitment. Data obtained during the UK/Polish survey around South Georgia in ... March 1989, were included in the study. Results indicate that the current biomass level of the C ...
Meeting Document : WG-FSA-89/8 Rev. 1 : Auteur(s): M. Basson, J. Beddington (United Kingdom) and W. Ślósarczyk (Poland)
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Distribution and size-age composition of Antarctic krill in the South Orkney Islands region (CCAMLR Subarea 48.2)
Abstract: This paper describes distribution and size-age composition of Antarctic krill ... /2009 and 2009/2010 seasons. All age cohorts of krill passed spawning during the season 2008/2009, while ... in anomalous cold 2009/2010 season significant proportion of krill of cohort 2+ skipped spawning ... . Individuals of Antarctic krill in age 1+ were absent in catches in both 2008/2009 and 2009/2010 seasons ...
Meeting Document : WG-EMM-10/16 : Auteur(s): D.O. Sologub and A.V. Remeslo (Russia)