Resultados de la búsqueda
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Predation release of Antarctic silverfish in the Ross Sea: how sensitive is the conclusion to uncertainties in the diet of Antarctic toothfish over the shelf?
Abstract: Between 2001 and 2013 the number of breeding pairs of Adélie penguins (Pygoscelis ... half a million. It has been suggested that predation release of Antarctic silverfish (Pleuragramma ... antarctica) due to fishing of one of its predators, Antarctic toothfish (Dissostichus mawsoni), could have ... , consumption rates and diets of toothfish and Adélie penguins over the Ross Sea shelf as a first test of the ...
Meeting Document : WG-FSA-15/41 : Autor(es): M.H. Pinkerton, P. O’B. Lyver, D.W. Stevens, J. Forman, R. Eisert and S. Mormede (New Zealand)
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Model-based mapping of assemblages for ecology and conservation management: A case study of demersal fish on the Kerguelen Plateau
of Common Profile (RCP) to quantify and map the distribution of demersal fish assemblages in an ... ecologically significant region of the Southern Ocean to a) gain ecological and management insights and b ... ) evaluate the utility of the new method for ecoregionalisation. The RCP approach is a multi-species, model ... -based approach that can overcome many limitations of traditional distance-based approaches. It ...
Meeting Document : WS-SM-18/P02 : Autor(es): N.A. Hill, S.D. Foster, G. Duhamel, D. Welsford, P. Koubbi and C.R. Johnson
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SELECTIVITY OF CONVENTIONAL AND CONTINUOUS TECHNIQUES OF KRILL FISHERY
Abstract: Combination of conventional and continuous techniques during krill fishery at the ... Russian commercial vessel "Maxim Starostin" allowed to compare the size structure of the ... Antarctic krill (Euphausia superba) caught by these two techniques. Results of comparison are discussed in ... relation to the selectivity of fishing gears and the space-time variability of krill. Differences between ...
Meeting Document : WG-EMM-11/14 : Autor(es): D. Sologub (Russia)
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Comparison of estimators of effective sample size for catch-at-age and catch-at-length data using simulated data from the Dirichlet-multinomial Distribution
Abstract: The incorporation of “effective sample size” (ESS) in integrated assessments is an ... approximate but simple way of modelling the distribution of catch-at-age or catch-at-length frequencies using ... frequencies. The ESS applied within the definition of the negative log-likelihood contribution to the ... -length frequency data relative to the other types of data used in integrated assessments of toothfish ...
Meeting Document : WG-SAM-07/7 : Autor(es): S.G. Candy (Australia)
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On biogeographic patterns of benthic invertebrate mega fauna on shelf areas of the Southern Ocean Atlantic sector
Abstract: The ideal approach to bioregionalisation of Antarctic and Southern Ocean shelf ... communities incorporates a range of data on physical, environmental and biological properties, as well as the ... interaction of these properties. Here, benthic invertebrate megafaunal communities of shelf habitats within ... the Atlantic sector of the Southern Ocean were analysed quantitatively from scientific survey trawl ...
Meeting Document : WS-BSO-07/10 : Autor(es): S.J. Lockhart and C.D. Jones (USA)
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On possibility of using acoustic method to improve quality of Champsocephalus gunnari biomass estimates in Subarea 48.3
Abstract: An attempt has been made to study icefish as an object of acoustic survey basing on the ... acoustic and biological data obtained by Russian RN ATLANTIDA in the area of South Georgia Island (January ... -February 2000). Estimation of possible target strength values was made by a comparison to TS of other fish ... and physical body properties. There has been proved a comparability of Ch.gunnari length frequencies ...
Meeting Document : WG-FSA-00/31 : Autor(es): S. Kasatkina (Russia)
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On the state of Champsocephalus gunnari stock in Subarea 48.3 and methods of its assessment
2000 showed clearly a necessity to revise the methods of icefish (which is near-bottom and pelagic fish ... species) biomass assessment based on the results of bottom trawl surveys. A question on unreliability of ... stock assessment was repeatedly raised on the meetings of Working Group on Fish Stock Assessment (WGFSA ... ) both during the period of the icefish fishery in 1980s and after its ceasing in 1990s. In all cases, a ...
Meeting Document : WG-FSA-00/45 : Autor(es): K. Shust, V. Senioukov, P. Gasiukov and A. Kozlov (Russia)
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Analyses of acoustic line-transect data from the waters around South Georgia: estimation of krill (Euphausia superba Dana) biomass
Abstract: A large-scale acoustic survey of zooplankton stocks of the waters around South Georgia ... various definitions of strata. The total biomass in the area of 155 786 km2 was estimated to be 1.8225 x ... 106 t (Coefficient of Variation = 9.5%). This gives an estimate of mean density throughout the region ... of 11.7 t km-2. Although the estimate of the mean is not sensitive to the definition of strata, the ...
Meeting Document : WG-KRILL-91/30 : Autor(es): E. Murphy, I. Everson and A. Murray (United Kingdom)
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The Role of Fish as Predators of Krill (Euphausia superba) and Other Pelagic Resources in the Southern Ocean
number of food studies were conducted. Currently, the best estimates of krill consumption by fish are 23 ... – 29. 106 tonnes of krill and other pelagic prey taken annually by demersal fish and 7 – 44. 106 tonnes ... confidence limits. Major shortcomings of the consumption estimated for mesopelagic fish are the validity of ... hydro-acoustic biomass estimates conducted in the late 1980’s and the lack of quantitative food ...
Meeting Document : CCAMLR-IWC-WS-08/09 : Autor(es): Collins, M.A., Williams, R., Agnew, D.J., Kock, K.-H., Belchier, M., Shust, K.V., Welsford, D., Hanchet, S., Pshenichnov, L., Barrera-Oro, E.
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Demographic studies of Antarctic krill Euphausia superba Dana in the Cooperation and Cosmonaut Seas (Indian sector of the Southern Ocean)
Abstract: The reproductive state and size composition of Euphausia superba collected in the ... Indian sector of the Southern Ocean from 1985 to 1990 were analyzed to estimate its growth, life span and ... mortality rates. The duration of the life cycle of E.superba exceeded 5 years in the Cosmonaut Sea and 6 ... -0.133 mm.d-1, during the first year of life, to 0.019-0.022 mm.d-1 during the fifth year. Von ...
Meeting Document : WG-Krill-94/16 : Autor(es): E.A. Pakhomov (Ukraine)