Resultados de la búsqueda
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Monitoring of relative abundance of fjord Notothenia rossii, Gobionotothen gibberifrons and Notothenia coriiceps at Potter Cove, South Shetland Islands, in years 2000 to 2003
net catches of fjord fishes of the species Notothenia rossii and Gobionotothen gibberifrons in ... those found in the early 1980s. At Harmony Cove, the relative abundance of N. rossii showed an increase ... in years 2002-2003, whereas G. gibberifrons was absent in the catches. No recovery of the stocks of ... . However, the increase observed in the catches of N. rossii in some years since 1997 might be indicative of ...
Meeting Document : WG-FSA-03/89 : Autor(es): E. Barrera-Oro, E. Marschoff, R. Casaux and B. Gonzalez (Argentina)
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Composition and characteristics of ichthyofauna in pelagic waters of South Georgia (Subarea 48.3)
ichthyocenosis in the subarea consisted of pelagic fishes (mainly Myctophidae), distributed at a depth range of ... 250 to 300 m, as well as demersal fishes in the pelagic stage of their life cycle. Catches contained ... small ones were caught in the water column. The main food item (up to 60-80%) of both juvenile and adult ... fish taken by the sampling trawl in the water column was found to be krill. Aggregations of juvenile C ... in the second half of the night (Table 3). Table 3: Mean index of stomach fullness for juvenile C ... ). Length composition of juvenile C. aceratus in catches varied from area to area. The largest fish (mean ... pelagic component of the ichthyocenosis in the subarea consisted of pelagic fishes (mainly Myctophidae ... ), distributed at a depth range of 250 to 300 m, as well as demersal fishes in the pelagic stage of their life ...
Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 125–164 : Autor(es): Frolkina, G.A., M.P. Konstantinova and I.A Trunov
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In situ target strength measurements of Antarctic zooplankton (Euphausia superba and Salpa thompsoni) at 120 khz and 200 khz, corroboration of scattering models, and a statistical technique for delineating species
(5):2985-2988 (1993)], the TS of in-situ krill are shown to fit a deformed cylinder model [T.K ... cumulative distributions (CDF's) of Δσbs derived from the differences in abs measurements at two ... , Antarctica, during the Austral Summer of 1994. Author(s): D.A. Demer and R.P. Hewitt (USA) Title: In situ ... Abstract: In-situ measurements of target strength (TS) were made of Antarctic zooplankton ...
Meeting Document : WG-Krill-94/12 : Autor(es): D.A. Demer and R.P. Hewitt (USA)
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Acoustic assessment of potential bias in abundance estimates of mackerel icefish from trawl surveys
that a significant proportion of the stock occurred in midwater. If this is the case, then bottom trawl ... acoustic signal are discussed. The vertical distribution of mackerel icefish in relation to the diel light ... Abstract: In 2000, CCAMLR asked the Working Group on Fish Stock Assessment (WG-FSA), whether ... trawl surveys are the most reliable and appropriate method to survey stocks of mackerel icefish ...
Meeting Document : WAMI-01/05 : Autor(es): E. van Wijk, T. Pauly, A. Constable and R. Williams (Australia)
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PRELIMINARY ESTIMATION OF PENGUIN BREEDING ABUNDANCE AT SPATIAL-SCALES OF RELEVANCE TO CCAMLR: INCORPORATING UNCERTAINTY IN COUNT DATA
breeding population, and would only account for uncertainty in the accuracy of the count data. However, the ... work was seen as useful in illustrating both the database of penguin count data compiled for the ... Abstract: One recommendation from the Predator Survey workshop was the undertaking of some ... estimation of SSMU-specific gentoo and Adélie breeding abundance in Area 48, and similar analyses of east ...
Meeting Document : WG-EMM-08/53 : Autor(es): H. Lynch, R. Naveen (USA), J. McKinlay, C. Southwell (Australia), P. Trathan (United Kingdom), W. Trivelpiece, S. Trivelpiece (USA) and D. Ramm (CCAMLR Secretariat)
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Growth and maturation of Euphausia superba Dana in northern areas of its distribution range (with reference to South Georgia and Bouvet Island areas)
maturation rates as well as the average minimal sizes of E.superba are appreciably higher in the former than ... South Georgia area as compared to Bouvet Island. The differences in the growth and maturation rates of ... in the latter area. This is attributed to milder climatic conditions and better food supply in the ... E.superba between these two areas persist with a change of climatic epochs. During the warmer climatic epoch ...
Meeting Document : SC-CAMLR-VIII/BG/22 : Autor(es): Delegation of USSR
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Precision of growth band determination from eyestalk sections of Antarctic krill (Euphausia superba) preserved in formalin
feedback management of krill fisheries. Samples stored in 70% ethanol provide an opportunity to detect the ... common in previous decades. Out of 162 Antarctic krill individuals preserved in 5% formalin, the growth ... the precision of the growth bands.Results show decreased CV and APE values and an increase in the EPA ... specimens preserved in formalin, and will benefit the stock assessment and acoustic estimation of this ...
Meeting Document : WG-EMM-18/P16 : Autor(es): G.P. Zhu, Y. Yang, Q. Song and H.T. Zhang
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Analysis of krill fishery operations in Subarea 48.1: spatial-time distribution of CPUE and fishing efforts
values of standardized CPUE indices in the Subarea 48.1 for the last 25 years. We continue to investigate ... the changes in fishing methods but is result of the influence of changing environment. Impact of ... management procedures for krill fishery in Subarea 48.1 as well as in Area 48. The source of this information ... Abstract: In previous years we revealed that period 2006-2011 is characterized by the highest ...
Meeting Document : WG-EMM-14/21 : Autor(es): S. Kasatkina and P. Gasyukov (Russia)
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Analysis of variability of krill size and fish by-catch in Japanese krill fishery based on scientific observer data
–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 ... -temporal variability in size structure of krill population, which is presumably derived from large ... variability of recruitment causing difficulty in predicting krill population dynamics. Variances of observer ...
Meeting Document : WG-EMM-12/68 : Autor(es): T. Okuda and M. Kiyota (Japan)
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Identification of marine Important Bird and Biodiversity Areas for penguins in South Shetland and South Orkney Islands: a comparison of two different approaches
reported here provide a new method for the designation of a network of marine IBAs in Antarctic waters for ... on pre-existing approaches but revised according to the specific ecology of Pygoscelis penguin ... , and 2) revision of parameters for the kernel analysis (the smoothing factor and the utilization ... distribution); • We applied the revised method to 24 datasets of tracking data (three species, seven colonies ...
Meeting Document : WG-EMM-17/35 : Autor(es): M.P. Dias, A.P.B. Carneiro, V. Warwick-Evans, C. Harris, K. Lorenz, P. Trathan