Resultados de la búsqueda
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Estimation of natural mortality for the Patagonian toothfish at Heard and McDonald Islands using catch-at-age and aged mark-recapture data from the main trawl ground
Paper Title: Estimation of natural mortality for the Patagonian toothfish at Heard and McDonald ... Islands using catch-at-age and aged mark-recapture data from the main trawl ground Abstract / Description ... in integrated assessments via CASAL for the Heard and McDonald Islands (HIMI, Division 58.5.2 ... adopted whereby the relatively long time series of catch-at-age and mark-recapture data from the main ... -recapture program beginning in April 1998 also in this ground (Candy et al., 2007). The total number of ... The annual natural mortality rate, M, is a very influential parameter in determining the productiv ... size and the age-at-maturity ogive. The integrated assessments using CASAL (Bull et al., 2005) of ... (D. mawsoni) in the Ross Sea (Subarea 88.1) (Dunn and Hanchet, 2007) apply a fixed value of M of ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 29–45 : Autor(es): Candy, S.G., D.C. Welsford, T. Lamb, J.J. Verdouw and J.J. Hutchins
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Surface water masses, primary production, krill distribution and predator foraging in the vicinity of Elephant Island during the 1989-90 austral summer
identified as the western end of the Weddell-Scotia Confluence. Krill abundance increased approximately 5 ... Abstract: Four successive surveys of the pelagic marine environment were conducted over a 100-by ... were collected to describe the thermohaline structure, the distribution of phytoplankton biomass and ... primary productivity, the distribution and demography of krill, and the foraging patterns of krill ...
Meeting Document : WG-CEMP-90/11 : Autor(es): A.F. Amos, J.L. Bengtson, O. Holm-Hansen, V.J. Loeb, M.C. Macaulay and J.H. Wormuth (USA)
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Contribution to the early life history of Channichthyidae from the Bransfield Strait and South Georgia
reported by Sosinski /1981/ and Kochkin /1982/, reaching in April, at the end of a summer season, the total ... examined. Their postlarvae and juveniles were found numerously in krill catches in the Scotia Sea area ... Chaenocephalus- were collected at the H. Arctowski Station /King George I., South Shetland Is./•from January 1979 ... to March 1980 /Fig. 1/. Length frequency distributions of the above-named species were usually ...
Meeting Document : CCAMLR/86/FA/08 : Autor(es): W. Ślósarczyk (Poland)
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Significant conservation benefits obtained from the use of a new fishing gear in the Chilean Patagonian toothfish fishery
Paper Title: Significant conservation benefits obtained from the use of a new fishing gear in the ... Chilean Patagonian toothfish fishery Abstract / Description: A new fishing technique, adapted from the ... artisanal trotline fishery for Patagonian toothfish (Dissostichus eleginoides) in Chile is described. The ... macrocephalus). The performance of this fishing technique with regard to seabird mortality and depredation by ... of the baited hooks at the end of the hook lines with the position of a weight. Buoy ~1 000 m ... . During the set, this sleeve remains at the upper end of the branch line, but when the thick main line ... - trated at the end of the branch line, close to the weight. Individual weights were much heavier than on ... was made by sci- entific observers when the fleet started using the Chilean longline. After about one ...
Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 79–91 : Autor(es): Moreno, C.A., R. Castro, L.J. Mújica and P. Reyes
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Experimental evaluation of the effectiveness of weighting regimes in reducing seabird by-catch in the longline toothfish fishery around South Georgia
Paper Title: Experimental evaluation of the effectiveness of weighting regimes in reducing ... seabird by-catch in the longline toothfish fishery around South Georgia Abstract / Description: A series ... of experiments was carried out in February 1999 at South Georgia (Subarea 48.3) to examine the ... effects of different weighting regimes on the incidental mortality of birds caught on longlines fishing ... feeding attempts. At the end of setting, a second count of the birds astern of the vessel was made. Any ... by the vessel's movement resulted in the streamer line snapping after a few seconds. The remains of ... corresponded with the wind direction, although the swell tends to lag behind after sudden wind changes. When ... end of setting. Agnew et al. Table 4: Bird by-catch rates and numbers of feeding attempts in the ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 119–131 : Autor(es): Agnew, D.J., A.D. Black, J.P. Croxall and G.B. Parkes
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Summary of the toothfish fishery and tagging program in the Amundsen Sea region (SSRUs 882C–H) to 2017/18
Abstract: The Amundsen Sea region toothfish fishery has been operating since 2003. In 2015, a ... research plan was developed to estimate the toothfish biomass the area, particularly in the South. The ... biological characterisation of the fishery shows a truncation of the right-hand limb of the age distribution ... between 2004 and 2014. No age data are currently available after 2014. We recommend that further ageing of ...
Meeting Document : WG-FSA-18/36 : Autor(es): S. Mormede and S. Parker
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Seabird by-catch in the Patagonian toothfish longline fishery at the Prince Edward Islands: 1998–1999
primarily linked to daytime sets, with most birds caught in the late afternoon or shortly after dusk. Use of ... Abstract: Longline fishing for Patagonian toothfish Dissostichus eleginoides in the South African ... Exclusive Economic Zone around the Prince Edward Islands commenced in 1996. This paper summarises seabird ... bycatch during the year July 1998-June 1999. Data on seabird bycatch were obtained from fishery observers ...
Meeting Document : WG-FSA-99/42 Rev. 1 : Autor(es): P.G. Ryan and B.P. Watkins (South Africa)
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A first step towards modelling the krill–predator dynamics of the Antarctic ecosystem
Paper Title: A first step towards modelling the krill–predator dynamics of the Antarctic ... ecosystem Abstract / Description: The history of human harvests of seals, whales, fish and krill in the ... Antarctic is summarised briefly, and the central role played by krill emphasised. The background to the ... hypothesis of a krill surplus in the mid-20th century is described, and the information on population and ... . After this exploitation of the Antarctic fur seals, and commencing at the beginning of the 20th cen ... taken from the end of the 18th century, followed by whales at the start of the 20th century. More ... microcephalus) were taken in substantial numbers from the 1950s, and after the depletion of the other major ... rossii) almost vanished from the vicinity of South Georgia after 514 000 tonnes were taken otros ...
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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Analysis of results from demersal fish surveys at South Georgia, undertaken by the United Kingdom and the USSR, January and February 1990
Paper Title: Analysis of results from demersal fish surveys at South Georgia, undertaken by the ... United Kingdom and the USSR, January and February 1990 Abstract / Description: The report describes ... discussions and analyses of the data from a survey from MV Hill Cove in January 1990 and RV Akademik Knipovich ... hauls interspersed with a few large catches. The small number of large catches cause a disproportionate ... Knipovich had only returned to Sevastopol at the end of May 1990 and this had left little time in which to ... were on the northern side of the west end of the island, near the shelf break west-southwest of the ... of the seabed after dark. Mr Parkes and Or Shust also reported seeing the same phenomenon on Furuno ... Xst = L Sh Xh/ L Sh h=1 h=1 Nh Xh = l/Nh L x~/Shi i=l The results after stratification into ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 223–254 : Autor(es): (Report of a Joint UK/USSR Workshop, 23 to 27 July 1990)
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Precautionary spatial protection to facilitate the scientific study of habitats and communities under ice shelves in the context of recent, rapid, regional climate change
Paper Title: Precautionary spatial protection to facilitate the scientific study of habitats and ... communities under ice shelves in the context of recent, rapid, regional climate change Abstract / Description ... : Recent rapid climate change is now well documented in the Antarctic, particularly in the Antarctic ... Peninsula region. One of the most evident signs of climate change has been ice-shelf collapse; overall, 87 ... inland (iv) by the end of the current century, the full effects of greenhouse gas increases are expect ... could be removed (and the area deleted from the list of protected areas) after the interim period has ... Peninsula region (Subarea 48.1) dur- ing several seasons after 1978/79. All of the finfish fisheries in ... of the western Antarctic Peninsula. CCAMLR closed the fisheries after the 1989/90 season in order ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 139–151 : Autor(es): Trathan, P.N., S.M. Grant, V. Siegel and K.-H. Kock