Resultados de la búsqueda
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Krill population dynamics at South Georgia: implications for ecosystem-based fisheries management
biomass. Krill abundance was highest during the middle of the summer in 3 years and in the late period in ... from surveys conducted in the early, middle and late period of the summers of 2001 to 2005, together ... recruitment in each year showed the greatest correlation with the acoustic series. The results are consistent ... with krill population size structure over the same period from predator diet data, were used with a ...
Meeting Document : WG-EMM-10/P08 : Autor(es): K. Reid, J.L. Watkins, E.J. Murphy, P.N. Trathan, S. Fielding and P. Enderlein
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Fishing and conservation in southern waters
Abstract: Fishing in the Southern Ocean commenced on finfish in 1969/70 and on krill in 1972/73 ... . Up to 1992/93, more than 3 million tonnes of finfish had been harvested, mainly around South Georgia ... and the Kerguelen Islands. After 15 years of exploitation, most fish stocks have been heavily depleted ... operations and the entanglement of seals in fragments of discarded or lost fishing gear. Most fish stocks had ...
Meeting Document : SC-CAMLR-XII/BG/11 : Autor(es): Delegation of Germany
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Length-age composition of icefish (Champsocephalus gunnari, perciformes, notothenioidei, Channichthyidae) from different locations of South Georgia Island subarea
Ch.gunnari length-age composition structure at early years of life for fish inhabiting areas to the south of ... -3 years had been migrating towards the Shag Rocks. It has been found that predomination of ... Eastern, Northern, Western, Southern Island Shelf and near Shag Rocks allowed for revealing similarity of ... Island and near Shag Rocks and finding a difference between those two groups and the eastern group ...
Meeting Document : WG-FSA-00/32 : Autor(es): Zh.A. Frolkina (Russia)
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Estimates of the tag loss rates for single and double tagged toothfish (Dissostichus mawsoni) fishery in the Ross Sea
tagged fish having at least one tag remaining after one year at liberty; 98.9% after two years at liberty ... Abstract: The rate at which tags are lost from tagged toothfish is an important parameter in ... individual tags are lost from tagged toothfish in Subareas 88.1 and 88.2 from a sample of 969 double tagged ... ) of individual tags were lost almost immediately, and then there was an ongoing rate of about 0.039 ...
Meeting Document : WG-SAM-11/18 : Autor(es): A. Dunn, M.H. Smith (New Zealand), D.J. Agnew (UK) and S. Mormede (New Zealand)
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Demography of Antarctic krill in the Elephant Island area (Antarctic Peninsula) during austral summer 2001
during the past years (between 198 and 230 krill 1000 m-3, i.e. between 40 and 46 m-2 or 11.3 g m-2). The ... absolute index was RI1 = 131.4 * 1000 m-3, which is among the highest values for the past 20 years. The ... high krill abundance and the high recruitment index reflect the end of a succession of years with poor ... for a successful spawning season, was G = 0.99, indicating an early initiation of the spawning season ...
Meeting Document : WG-EMM-01/10 : Autor(es): V. Siegel (Germany), B. Bergström (Sweden), U. Mühlenhardt-Siegel (Germany) and M. Thomasson (Sweden)
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Do Adélie penguin fledgling weights provide an index of prey availability?
the end of the breeding season were more strongly correlated with later foraging trips than with ... Abstract: We examine fledgling weights measured over 11 years at Béchervaise Island in relation ... to two assumed proxies of prey availability: breeding success and foraging trip duration. Concordance ... between the two proxies was apparent when considering guard stage foraging trip durations but this was not ...
Meeting Document : WG-EMM-05/21 : Autor(es): L. Emmerson, C. Southwell and J. Clarke (Australia)
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Upward adjustments to local catch limits for the krill fishery in Subarea 48.1
values, agrees generally with expert opinion, and suggests that indices of foraging trip duration, fledge ... the gSSMUs defined in another compilation of vignettes (AERD 2016a, pp. 3-13). We propose upward ... founded on 1) a “stoplight” classification of predator performance to identify years when predator ... predator populations, 2) repeat acoustic surveys to identify years when local krill biomass increases ...
Meeting Document : WG-EMM-16/47 : Autor(es): Antarctic Ecosystem Research Division, Southwest Fisheries Science Center and NOAA Fisheries
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Diet and foraging effort of Adélie penguins in relation to pack-ice conditions in the southern Ross Sea
years when pack ice was sparse. Foraging trip duration differed by colony, season and year and was ... was the most important prey, especially during years or periods within years when little pack ice was ... present. With respect to krill, which composed the remainder of diet, juvenile Euphausia crystallorophias ... increased as trip duration increased, to a point (2 d), but then decreased as duration increased further (up ...
Meeting Document : WG-EMM-98/15 : Autor(es): D.G. Ainley (USA), P.R. Wilson, K.J. Barton (New Zealand), G. Ballard, N. Nur (USA) and B. Karl (New Zealand)
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By-catch of rays in the 2002/03 toothfish fishery around South Georgia
from all observers’ tally periods on the catch rates of rays cut off the line; • In 2003 the UK, with ... the number of rays that were likely to have died as a result of being caught on longlines using a ...
Meeting Document : WG-FSA-03/58 : Autor(es): D.J. Agnew, J. Pearce and M. Endicott (United Kingdom)
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The diet of Antarctic fur seals Arctocephalus gazella during the breeding season at South Georgia
, the most numerous- fish taxon, 98% were taken between early February and the middle of March ... around South Georgia. The absence of group 3 krill (44-48 mm in length) in the South Georgia area, as ... pattern in three of the four years studied. Of the total number of the myctophid Protomyctophum choriodon ... diet studies to be conducted during the entire pup-rearing periods of several years. Author(s ...
Meeting Document : WG-EMM-95/28 : Autor(es): Arnould, J.P.Y., Reid, K.