Search results
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Estimating confidence intervals for fish stock abundance estimates from trawl surveys
using the swept area method, using likelihood ratios from Aitchison's delta distribution ... . Simulation tests of the method show that unbiassed estimates of the density and biomass can be obtained and ... that the estimated confidence intervals have close to the nominal coverage probability. Performance ... deteriorates in cases where few of the hauls contain fish, and the coefficient of variation is high. The lower ...
Meeting Document : WG-FSA-93/20 : Author(s): W.K. de la Mare (Australia)
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Cruise report EH-2013/02
Abstract: This report presents a summary of the work conducted onboard and a preliminary ... description of the results obtained during the research survey. The cruise started on april 26th and returned ... to Mar del Plata the 21st may 2013. The work was conducted in the CCAMLR statistical area 48.3 and ... its main objective was to obtain information on the status of the stocks of Chamsocephalus gunnari and ...
Meeting Document : WG-FSA-13/61 : Author(s): G. Álvarez Colombo, J. Bastida, F. Castro, Á. Cubiella, E. Gaitán, E. Marschoff, P. Martinez, L. Padovani, D. Palmerola, R. Reta, R. Silva, S. Vivequin, O. Wöhler and A. Zavatteri (Argentina)
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Trade data analysis – Reconciliation of CDS data with fine-scale catch and effort data
Abstract: The reconciliation of CDS data with monthly fine-scale catch and effort data has ... demonstrated the effectiveness of the CDS to trace the catch of toothfish caught in the CCAMLR Convention Area ... ongoing. This reconciliation has demonstrated the success in the methodology and will in the future be ... implemented in the reconciliation of trade data and other relevant CCAMLR datasets. Author(s): CCAMLR ...
Meeting Document : CCAMLR-XXXVII/BG/14 Rev. 1 : Author(s): CCAMLR Secretariat
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ADÉLIE PENGUIN SURVIVAL: AGE STRUCTURE, TEMPORAL VARIABILITY AND ENVIRONMENTAL INFLUENCES
Abstract: The driving factors of survival, a key demographic process, have been particularly ... challenging to study, especially for winter migratory species such as the Adélie penguin (Pygoscelis adeliae ... what environmental features they are most likely to respond to. Here we examine the influence of ... environmental fluctuations, broad climatic conditions and the success of the breeding season prior to winter on ...
Meeting Document : WG-EMM-11/P4 : Author(s): L. Emmerson and C. Southwell
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A REVIEW OF BIAS AND UNCERTAINTY IN ANTARCTIC PACK-ICE SEAL ABUNDANCE ESTIMATES
Abstract: While the joint CCAMLR-IWC workshop will consider a number of parameters for species ... of pack-ice seals focuses primarily on abundance and to a lesser extent trends in abundance. The ... review addresses population surveys and abundance estimates for the four species of phocid seal commonly ... encountered in the pack-ice and fast-ice surrounding Antarctica (crabeater seal Lobodon carcinophaga, Ross ...
Meeting Document : CCAMLR-IWC-WS-08/06 : Author(s): Steinhage, D., Bengtson, J., Blix, A.S., Bester, M., Boveng, P., Laake, J., Cameron, M., Nordøy, E., Forcada, J., Stewart, B., Southwell, C., Trathan, P., Rogers, T., Plotz, J., Bornemann, H.
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Two decades of variability in krill predators at Bird Island, South Georgia and their potential as ecosystem indicators
Abstract: The breeding performance of seabirds and seals at Bird Island, South Georgia, in the ... monitoring programme. We examined the mechanistic relationships between, and patterns of inter-annual ... included foraging performance, offspring survival, offspring mass, the contribution of Antarctic krill ... Euphausia superba to the diet, and per capita reproductive performance (PRP: the product of offspring ...
Meeting Document : WG-EMM-12/16 : Author(s): S.L. Hill, C.M. Waluda, H.J. Peat and S. Fielding (United Kingdom)
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Species variability and population structure of Euphausiacea in Admiralty Bay (King George Island; South Shetland Islands) during Antarctic summer
Abstract: The main component of zooplankton in Antarctic pelagic waters, apart from copepods or ... krill is still scarce and fragmentary, despite the fact that those organisms are a significant element ... of the penguins and pinnipeds’ diet. Admiralty Bay, because of its specific hydrological conditions ... make this region particularly susceptible to climate change. This area is also a breeding site of the ...
Meeting Document : WG-EMM-14/60 : Author(s): A. Panasiuk-Chodnicka, J. Wawrzynek and M. Iwona Żmijewska (Poland)
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FIELD IDENTIFICATION GUIDE TO HEARD ISLAND AND MCDONALD ISLAND (HIMI) BENTHIC INVERTEBRATES
Abstract: At CCAMLR-XXVI the Working Group on Fish Stock Assessment (WG-FSA) noted a lack of ... specific reference material for the identification of benthic invertebrates in areas specific to which ... observers carry out their activities (SC-CAMLR-XXVI: Annex 5, paragraph 6.32). To improve the standard of ... observer identifications and also to assist in the identification of vulnerable areas, the Scientific ...
Meeting Document : WG-FSA-08/59 : Author(s): T. Hibberd and K. Moore (Australia)
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A comparison of Antarctic krill (Euphausia superba Dana) caught by nets and taken by macaroni penguins (Eudyptes chrysolophus Brandt): evidence for selection?
) breeding at Bird Island, South Georgia and concurrent net samples caught within the penguin foraging range ... , we examined the potential selection of different length and maturity stages of Antarctic krill ... (Euphausia superb a Dana). Using Monte Carlo randomised simulation techniques we also determined the ... probability of obtaining length-frequency distributions of krill different from that obtained from the net ...
Meeting Document : WG-EMM-96/08 : Author(s): Croxall, J.P., Hill, H.J., Trathan, P.N., Watkins, J.L.
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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 : Author(s): T. Okuda and M. Kiyota (Japan)