Resultados de la búsqueda
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Status of the FIBEX acoustic data from the West Atlantic
Paper Title: Status of the FIBEX acoustic data from the West Atlantic Abstract / Description ... : Data from the FIBEX acoustic survey in the West Atlantic sector have been re-examined to check the ... consistency between the results from four of the vessels, Itzumi, Dr Eduardo L. Holmberg, Odissey and Walther ... Herwig. While there is an error factor due to the combination of data collected at 50 kHz (Walther Herwig ... , BIOMASS, acoustic data, CCAMLR INTRODUCTION In 1991 the Commission for the Conservation of Antarctic ... collection (i.e, Anon., 1986). In the absence of the raw acoustic data, the only changes acceptable to ... acoustic survey in the West Atlantic sector have been re-examined to check the consistency of krill ... 50 kHz and the value found at a separate frequency. However, in the absence of new experimental ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 35–48 : Autor(es): Trathan, P.N. and I. Everson
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A first step towards modelling the krill–predator dynamics of the Antarctic ecosystem
ecosystem Abstract / Description: The history of human harvests of seals, whales, fish and krill in the ... hypothesis of a krill surplus in the mid-20th century is described, and the information on population and ... ) species. The model commences in 1780 (the onset of fur seal harvests) and distinguishes the Atlantic ... /Indian and Pacific Ocean sectors of the Southern Ocean in view of the much larger past harvests in the ... gunnari) became a target of the former Soviet Union fleets in the mid- 1970s, and the mean annual catch ... emphasised. The background to the hypothesis of a krill surplus in the mid-20th century is described, and ... Southern Ocean in view of the much larger past harvests in the former. A reference case and six ... history of human harvesting in the Antarctic The Antarctic is a region where the largest human-induced ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 217–277 : Autor(es): Mori, M. and D.S. Butterworth
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Research currently being undertaken by the Republic of South Africa on "dependent and related species" within the Antarctic marine ecosystem
Paper Title: Research currently being undertaken by the Republic of South Africa on " ... components of the biological sciences programme are described. The primary objective of the studies being ... undertaken is to improve our understanding of the ecology of important predators (especially seals and ... seabirds) and their prey (especially krill and squid) in the Antarctic, and closely related marine ... the mammal fauna -- msinl::,i sea Is - in the southern ocean~; and on the i~;1ands south of sc>l ... ;w:; comPo~;ition of the POPulation hove also been described. In addition, studies havt? been undc ... durins 1!J73 and indicate a decrease of 5 to 11 Per cent Per !:lear in the flOPulations at Mari on (4 ... cow nu11'1bers, also be of iw,Portance - the latt,er aspects is be in~ i n1,1est i !'lated. The ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/2 (Selected Scientific Papers, SC-CAMLR-SSP/2) : 59-77 : Autor(es): South Africa
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Observations on the diet of Antarctic toothfish (Dissostichus mawsoni) from the Ross Sea, Antarctica (CCAMLR Statistical Subarea 88.1)
Abstract: The diet of Antarctic toothfish Dissostichus mawsoni captured by bottom longline in the ... 62–197 cm TL. A high proportion of stomachs sampled were empty (34% in 2001 and 49% in 2002) and the ... difficult. Fish were the most important prey category (86% of stomachs in 2001 and 78% in 2002), in ... remaining stomachs often contained prey in advanced stages of digestion, making prey identification ...
Meeting Document : WG-FSA-02/15 : Autor(es): J.M. Fenaughty, D.W. Stevens and S.M. Hanchet (New Zealand)
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A three-frequency method to determine the abundance and the size of two euphausiid species (Euphausia superba and Euphausia crystallorophias)
obtain information about the mean size (length) of the organisms in each aggregation. In principle the ... , and directly from net samplings. The mean size of the crustaceans can be estimated from “in situ ... role in the Ross Sea pelagic ecosystem (Marr, 1962; Azzali et al., 1999). To estimate the abundance of ... catches. Unfortunately the precision and credibility of this method are often insufficient when applied in ...
Meeting Document : WG-EMM-01/63 : Autor(es): M. Azzali, J. Kalinowksi, G. Lanciani and I. Leonori (Italy)
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The biology of the spiny icefish (Chaenodraco wilsoni Regan, 1914)
Abstract: The most abundant icefish species observed in catches off the northern tip of the ... close to spawning. Spawning at the tip of the Antarctic Peninsula is likely to occur in October-November ... Antarctic Peninsula in the last 25- 30 years has been the spiny icefish Chaenodraco wilsoni Regan 1914. C ... . wilsoni has been exploited on a commercial scale from the late 1970’s to the end of the 1980’s off ...
Meeting Document : WG-FSA-07/P1 : Autor(es): K.-H. Kock, L.V. Pshenichnov, C.D. Jones, J. Gröger and R. Riehl. (Polar Biol., 31 (3): 381–393 (2007))
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Proposed methodology for the assessment of the exploratory fishery for Dissostichus spp. on BANZARE Bank (Division 58.4.3b)
Abstract: In 2006 the CCAMLR scientific committee noted several features of exploratory ... Dissostichus fisheries in the southern Indian Ocean (58.4) which gave cause for concern as to the status of the ... resource in this area, and the lack of a scientific basis for setting catch limits in these areas (SC-CAMLR ... methodology will produce an improved understanding of the trends in this fishery and greatly assist in ...
Meeting Document : WG-SAM-07/8 : Autor(es): D.C. Welsford, A.J. Constable and G.B. Nowara (Australia)
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Length-age composition of the Patagonian toothfish, Dissostichus eleginoides, from the Kerguelen Island area
are presented and discussed in the paper. Detailed results of these studies are compiled in tables ... tonnes. In other seasons between 1984 and 1992 catches of the species was taken only occasionally and ... years. Results presented in the paper are in agreement with results of other studies conducted in the ... abundant in catches, mean age was 8.2- 9.8 years. In the 1991/92 season fishing for the species was ...
Meeting Document : WG-FSA-92/08 : Autor(es): V.G. Prutko and V.N. Chikov (Ukraine)
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The diet of Antarctic fur seals Arctocephalus gazella during the breeding season at South Georgia
Euphausia superba was the main prey item, occurring in 88% of all scats (n=497), whereas fish occurred in 47 ... % and squid in 5%. There was considerable intra and inter-annual variation in the characteristics of ... selecting particular sizes of krill and, therefore, that the krill in the diet reflects the krill available ... around South Georgia. The absence of group 3 krill (44-48 mm in length) in the South Georgia area, as ...
Meeting Document : WG-EMM-95/28 : Autor(es): Arnould, J.P.Y., Reid, K.
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Do fish prey size affect the foraging patterns and breeding output of the Antarctic shag Phalacrocorax bransfieldensis?
, followed by octopods and gastropods. Between colonies there were marked differences in the size of the fish ... . Differences in the composition of the diet might be related to different foraging areas used by the shags ... spent significantly more time in foraging activities. Although at the beginning of the study the number ... of chicks per nest was similar in the three colonies, the breeding output at Py Point was markedly ...
Meeting Document : WG-EMM-02/4 : Autor(es): R. Casaux and A. Baroni (Argentina)