Resultados de la búsqueda
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Using carapace measurements to determine the sex of Antarctic krill (Euphausia superba)
derived from mature krill in years following significant recruitment events with large proportions of ... Abstract: Krill carapaces measurements have been used to reconstruct krill length frequencies in ... populations. The equations have been applied to fur seal diet studies in the South Shetlands but until now ... independently derives sex-specific regression models for krill collected in the South Shetlands. Allometric ...
Meeting Document : WG-EMM-05/26 : Autor(es): J.D. Lipsky, M.E. Goebel, C.S. Reiss and V. Loeb (USA)
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Beach debris survey – Main Bay, Bird Island, South Georgia 2000/01
), but to a lesser extent than in previous years, whilst miscellaneous debris accounted for almost as ... of 408 items recorded in 1999/00 and the lowest levels of summer beach debris (147 items) since the ... 1994/95 season. The difference between the number of items collected in the summer and winter months is ... the lowest since reporting began, with only 4 items more collected in the summer than in the winter ...
Meeting Document : SC-CAMLR-XXI/BG/03 : Autor(es): Delegation of the United Kingdom
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ANALYSIS OF ROSS SEA TAGGING AND RECAPTURE RATES
year and recapture year for tags released and recaptured in the same SSRUs on the slope of 88.1 was ... (caught), all in numbers. 2. The overall size of the dataset was 734 combinations of release year ... compiled for the years 2003-2006. Recapture rate was expressed as tags captured/tags released/fish scanned ... has not been consistent enough between nations to allow the analysis to be definitive. In many cases ...
Meeting Document : WG-SAM-08/07 : Autor(es): D.J. Agnew (UK)
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Review of depredation mitigation methods applied within the CCAMLR Statistical Area
growing issue in fisheries around the world. Within the CCAMLR management killer whales and to a lesser ... sp.). Several measures have been developed and tested over the years to mitigate depredation by ... sound, the physical protection of the catch by nets, hooks or wires or changes in fishing practise such ... of different length. However, deterrents and in particular acoustic deterrents have the potential to ...
Meeting Document : WG-SAM-15/28 : Autor(es): R. Faulkner, N. Edmonds and M. Soeffker (United Kingdom)
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ECOLOGICAL REPERCUSSIONS OF HISTORICAL FISH EXTRACTION FROM THE SOUTHERN OCEAN
Abstract: A major mid-1980s shift in ecological structure of significant portions of the Southern ... stocks were on average reduced to <50%, and finally (mid-1980s) to <20%, of original size. Despite ... -selected life-history patterns, and before exploitation presumably fluctuated in accordance with infrequent ... oscillated between two states, but has remained in its “positive mode” since the time of the fish extraction ...
Meeting Document : WG-EMM-08/P07 : Autor(es): D. Ainley and L. Blight
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Growth rates of Antarctic fur seals as indices of environmental conditions
growth rates in years of low krill availability. Biases reflecting changes in the component of the ... mass at age in each year compared to the multi-year mean, that was not dependent on assumptions of ... weighing cross-sections of the population were compared with measured/inferred changes in the the ... differences in growth rate can reliably be derived from differences in the slope of a linear relationship ...
Meeting Document : WG-EMM-01/20 : Autor(es): K. Reid (United Kingdom)
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Algunos aspectos biologicos relevantes a la explotacion de la merluza negra (Dissostichus eleginoides Smitt, 1898) en la zona economica exclusiva argentina y sector oceanico adyacente
eleginoides) in the Argentine Sea, and atempts some explanation by a trophic analysis of such distribution ... . The distribution of Patagonian toothfish extends between of 36°30'S and 55°S from 80 to 2500 m ... cm, and most of the adult sizes (>80cm) were found in waters at depths greater than 900 meters ... analysed data in different areas including CCAMLR area, longline or trawl operation fishing is recommended ...
Meeting Document : WG-FSA-97/49 : Autor(es): Almeyda, S.M., Prenski, L.B.
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Preliminary insights of Antarctic toothfish sub-adults life-history traits from the southern Weddell Sea (Subarea 48.5)
bottom trawling carried out by the RV Polarstern in the southern Weddell Sea (Subarea 48.5) (PS82, ANT ... -Larsen Ice Shelf. In this document we report first data on individual age, gonad stage of maturity and ... were immature, showing an age range of 10-13 years. Main prey consisted of Antarctic silverfish and ...
Meeting Document : WG-FSA-18/06 : Autor(es): M. La Mesa, F. Donato and E. Riginella
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Further computations of the consequences of setting the annual krill catch limit to a fixed fraction of the estimate of krill biomass from a survey
a function of the fraction of the biomass estimate which is set as the catch for a 20-year period ... fishing mortality, as specified by the Fourth Meeting, results in marked reductions in the probabilities ...
Meeting Document : WG-KRILL-93/42 : Autor(es): D.S. Butterworth, G.R. Gluckman, R.B. Thomson and S. Chalis (South Africa)
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The relationship between sea-ice cover and Adélie penguin reproductive performance at Béchervaise Island
population growth in response to a reduction in the frequency of heavy sea-ice years. However, it is ... the form of sea-ice present, the season in which it is present and the processes that such sea-ice ...
Meeting Document : WG-EMM-07/21 : Autor(es): L. Emmerson and C. Southwell (Australia)