Résultats de la recherche
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An evaluation of reduced target strength estimates reported for krill (Euphausia superba)
on the same experiment and report new calculations of the target strength of krill (Euphausia superba ... assumptions made in calculating target strength. Whether the results of these papers are valid is critically ... important, given that they are being cited as a basis for increasing the estimates of krill standing stock ... in the Antarctic. The weaknesses in their data stem from the methods used to calculate target ...
Meeting Document : WG-KRILL-90/13 : Auteur(s): M.C. Macaulay (USA)
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Analysis of variability of krill size and fish by-catch in Japanese krill fishery based on scientific observer data
Antarctic krill commercial fishing vessels, we estimated the relationship between statistical precision and ... –2008 were analysed by using a hierarchical Bayesian model. The models were composed of multistage ... biological process error in the population dynamics from fishery process as observation error. In both krill ... length and bycatch fish number, the parameters estimated by MCMC hardly show difference among years, sub ...
Meeting Document : WG-EMM-12/68 : Auteur(s): T. Okuda and M. Kiyota (Japan)
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Marine debris and entanglements at Bird Island and King Edward Point, South Georgia, Signy Island, South Orkneys and Goudier Island, Antarctic Peninsula 2012/13
Island, South Orkneys and at Goudier Island, Antarctic Peninsula for the period April 2012 to March 2013 ... hydrocarbon soiling at any of the four sites during the reporting period. Overall, the occurrence of beached ... marine debris was below the long-term mean at Bird Island during both summer and winter and was the ... lowest recorded in 23 years of summer surveys at Signy Island, possibly due to sea-ice coverage at the ...
Meeting Document : SC-CAMLR-XXXII/BG/05 : Auteur(s): Delegation of the United Kingdom
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Distribution, density and relative abundance of Antarctic krill estimated by maximum likelihood geostatistics on acoustic data collected during commercial fishing operations
Abstract: There is a substantial harvestfor Antarctic krill in the Southern Ocean, butlittle ... regular scientific monitoring of the resource. Recently, however, the Commission for the Conservation of ... fisheries to increase the amount of relevant information available for making management decisions. We here ... the vessel ‘Saga Sea’ were processed to produce probability of presence, conditional density and ...
Meeting Document : WG-EMM-16/P12 : Auteur(s): E.J. Niklitschek and G. Skaret
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Evaluation of some processing techniques applied to acoustic recordings from two krill fishing vessels
Abstract: Acoustic data from krill fishing vessels have the potential to provide useful ... contributions to assess local krill abundance and distribution, and even as input to the CCAMLR feedback ... management system under development. The possibility to collect such data from the fleet has been ... demonstrated through a CCAMLR proof of concept, but processing is in most cases essential before any use of the ...
Meeting Document : SG-ASAM-17/03 : Auteur(s): X. Wang, G. Skaret and O.R. Godø
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Assessing data requirements for tag-based estimates of local biomass in data-poor and exploratory fisheries
Research Block 5843a_1 with a fixed exploitation rate and various tagging rate scenarios to assess the ... impact on the numbers of tagged fish recaptures and accuracy of tag-based estimates using the Chapman ... estimator. The results showed that tag-based biomass estimates obtained from a low numbers of recaptures ... Chapman-estimates to achieve a 25% level of accuracy at least 50% of the time, required a minimum of 6 ...
Meeting Document : WG-SAM-17/13 : Auteur(s): L. Robinson, P. Burch and K. Reid
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Revised continuation proposal of multi-Member research on Patagonian toothfish (Dissostichus eleginoides) exploratory fishery in 2018/19 in Division 58.4.3a by France and Japan
Abstract: France and Japan revised a research plan to continue investigating the populations of ... Patagonian toothfish (D. eleginoides) in the Division 58.4.3a during the next fishing seasons from 2017/18 ... Division, research fishing has been conducted by France and Japan since 2012 in the research block by three ... ” (France). The first Franco-Japanese exploratory longline fishery research plan for Dissostichus spp. in ...
Meeting Document : WG-FSA-18/61 : Auteur(s): Delegations of France and Japan
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Developing priority variables (“ecosystem Essential Ocean Variables” – eEOVs) for observing dynamics and change in Southern Ocean ecosystems
Ocean Observing (FOO) to begin developing ecosystem Essential Ocean Variables (eEOVs) for the Southern ... underlying causes are needed to report on their status and to guide management. Here we use the Framework on ... appropriate spatial and temporal scales and are useful to the extent that they contribute to direct estimation ... support assessments. In this paper we outline the rationale, including establishing a set of criteria, for ...
Meeting Document : WG-EMM-16/P11 : Auteur(s): A.J. Constable, D.P. Costa, O. Schofield, L. Newman, E.R. Urban Jr., E.A. Fulton, J. Melbourne-Thomas, T. Ballerini, P.W. Boyd, A. Brandt, W. de la Mare, M. Edwards, M. Eléaume, L. Emmerson, K. Fennel, S. Fielding, H. Griffiths, J. Gutt, M.A. Hindell, E.E. Hofmann, S. Jennings, H.S. La, A. McCurdy, B.G. Mitchell, T. Moltmann, M. Muelbert, E. Murphy, T. Press, B. Raymond, K. Reid, C. Reiss, J. Rice, I. Salter, D.C. Smith, S. Song, C. Southwell, K.M. Swadling, A. Van de Putte and Z. Willis
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On peculiarities of icefish (Champsocephalus gunnari) vertical distribution in different habitats
Abstract: The significant similarity of Kerguelen and South Georgia icefish Ch.gunnari ... populations ecology has been revealed. Fish of all lengths and ages are planktonphages. Fish of the first two ... age groups have been continuously found in the pelagic layer off South Georgia and Kerguelen-Heard ... . Immature fish also partially distribute in the pelagic layer both in the daytime and at night. Mature fish ...
Meeting Document : WG-FSA-03/54 : Auteur(s): J.A. Frolkina (Russia) and V.V. Herasimchuk (Ukraine)
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Aide memoire: Balleny Islands
Abstract: The Balleny Islands area contains special values which New Zealand believes are worthy ... of protection. New Zealand's past proposals have not yet achieved consensus support and the ... process for designating marine protection within the Antarctic Treaty System is not clearly established ... represents the best method of protecting the important values of the Balleny Islands would be developed for ...
Meeting Document : WG-EMM-01/71 : Auteur(s): Delegation of New Zealand