Résultats de la recherche

1. Comparative feeding ecology of Patagonian toothfish (Dissostichus eleginoides) in the southwestern Atlantic

   eleginoides) was investigated in two offshore regions in the southwestern Atlantic: on the Argentinian ... °-45°W. The South Georgia area was divided into two zones: the shelf zone and deep-water zone. On the ... continental shelf/slope between 46°-55°S and 60°-64°W, and around South Georgia between 53°-55°30' and 3 ... Argentinian continental shelf/slope, the length of D. eleginoides ranged from 30 to 95 cm total length (TL ... main line of 20 000 m, with branch lines each with 90 hooks (model 'Ancora', 30 mm gap) spaced at 1 m ... distribution for the species of the family Lithodidae in the Atlantic Ocean where only two crab species of ... , krill abundance is low and krill do not constitute an important food item for D. eleginoides ... investigated in two offshore regions in the southwestern Atlantic: on the Argentinian continental shelf/slope ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 105–124 : Auteur(s): García de la Rosa, S.B., F. Sánchez and D. Figueroa

2. Age–length composition of mackerel icefish (Champsocephalus gunnari, Perciformes, Notothenioidei, Channichthyidae) from different parts of the South Georgia shelf

   the South Georgia area. An analysis of the spatial distribution of C. gunnari size and age groups over ... similar age-length composition for young fish inhabiting areas to the west of the island and near Shag ... Rocks. Differences were observed between those those two groups and the eastern group. The larger number ... to live not only in off-bottom, but also in pelagic waters, an earlier age of sexual maturity ... sometimes observed to be completely absent for several years (e.g. 1982 year class) (Figure 4). A ... trawl was towed at 3-3.5 knots for 30 minutes. Catch- ability was assumed to be 100%. Approximately ... was increased by one year. RESULTS History of Commercial Fishing for C. gz~rzizcrri C ... only observed in five out of 20 abundant year classes at South Georgia (1975,1981,1985,1986 and 1988 ...

   Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 133–146 : Auteur(s): Frolkina, G.A

3. Fish distribution and biomass in the Heard Island zone (Division 58.5.2)

   occupies. There was one aggregation area of Lepidonotothen squamifrons on an outlying bank during two ... Island and the McDonald Islands, an Australian Territory around which a 200-mile EEZ has been declared ... . In order to assess the potential of this area for commercial fishing, and to obtain some preliminary ... data for its  management, three random stratified surveys were conducted to investigate the ... aggregation area of Lepidonotothen squarnifrans on an outlying bank during two surveys, but this had ... following changes were Each haul was for 30 minutes duration on the made with respect to summer 1992 ... during the two cruises on which it was sampled. Length frequencies for the three cruises (Figure 4 ... the other two cruises. For L . squamifrons the converse is true. There were very low Table 3a ...

   Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 1–20 : Auteur(s): Williams, R. and W.K. de la Mare

4. Modelling variability and estimating power to detect change in Adélie penguin fledgling weights

   year, but there was no evidence that the rate of decline differed between years. A consequence of this ... weight data were used to examine the power to detect a change in fledgling weights after an impact. The ... statistical models were developed from first principles and incorporated both within- and between-year ... or decrease after an impact. Fledgling weight was found to decline through the fledging period each ... than 30 birds each year. This is the case for both one- and two-tailed tests with a power greater ... birds, or (c) 30 birds each year. Change detected for three to five years of monitoring after change ... from an overall mean weight of 3 139 g. Estimates presented for 50 birds weighed each year. Change ... , and there was limited gain from weighing more than 30 birds each year. There is a threshold for ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 191–200 : Auteur(s): Emmerson, L.M., C. Southwell and J. Clarke

5. Movement, growth and available abundance to the fishery of Dissostichus eleginoides Smitt, 1898 at Heard Island, derived from tagging experiments

   for the management of toothfish stocks and that trends in abundance derived from these experiments ... separate between shelves and banks separated by deep water. More particularly, the separation of  stocks on ... resident during their phase in the depth range of the fishing grounds, but they move on once they approach ... end of the size range normally found on the grounds. These four long-range movers provide the first ... te d nu m be rs (m illi on s) 1998 1999 2000 2001 Year 50 40 30 20 10 0 P re di ct ... . In each simulation year, the biomass is recalculated by adding an amount for annual growth and ... la bl e nu m be rs (m ill io ns ) 1998 1999 2000 2001 Year 0 10 20 30 40 50 Pr ed ic ... the GYM, based on parameters for HIMI toothfi sh used in SC-CAMLR (2001). For a given year in the ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 33–48 : Auteur(s): Williams, R., G.N. Tuck, A.J. Constable and T. Lamb

6. Discrimination of Macrourus whitsoni and M. caml (Gadiformes, Macrouridae) using otolith morphometrics

   otoliths of the two species was sought. Based on 220 M. whitsoni and 307 M. caml otoliths, a linear ... fishery in the Ross Sea region is comprised of two species, rather than being solely Macrourus whitsoni ... excellent discrimination between the two species (92% success). A method was also developed to discriminate ... estimate the relative consumption of the two species of grenadier. Models to estimate fish length, weight ... 80 60 40 20 0 10 20 30 40 50 60 70 Age (years ... Laptikhovsky, Dirk Welsford and an anonymous reviewer are thanked for comments and sugges- tions that helped ... – male M. whitsoni – female M. caml – male M. caml – female 60 50 40 30 20 10 0 N um be r o ... 80 60 40 20 30 40 50 60 70 80 90 TL (cm ...

   Science Journal Paper : CCAMLR Science, Volume 22 (CCAMLR Science, Volume 22) : 15–28 : Auteur(s): Pinkerton, M.H., C. Ó Maolagáin, J. Forman and P. Marriott

7. Observation of seabirds in the Southern Ocean in 1988/89

   :00; 12:00, 16:00 and 20:00 ship-time, while sailing between Antarctic stations and while en route to ... 73°30'S in the Pacific sector. Most often single birds were observed and it was rare for two to be ... their numbers never exceeded 10. Only once, on 30 December 1988, when the vessel was sailing across an ... . Two or three specimens would follow in the ship's wake which enabled them to feed on cryoplankton ... . Thirty minute observations were made daily during daylight hours at 8:00; 12:00,16:00 and 20:00 ship ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 521–542 : Auteur(s): Vagin, A.V. and V.V. Popov

8. Assessing the power to detect systematic change in Adélie penguin foraging trip duration

   test for change based on the difference between pre- and post-impact means generally performed better ... constructed and fitted to data collected at Béchervaise Island over a 12-year period when only natural ... or trips sampled diminished rapidly when sample sizes were greater than 30 penguins and three trips ... per penguin. Statistics were developed to test for three forms of change (step, trend and ramp). A ... an ge 0.0 0.2 0.4 0.6 0.8 1.0 0 5 10 15 20 25 30 0.0 0.2 0.4 0.6 0.8 1.0 0 5 10 15 20 25 ... year, and yijkm is the natural logarithm of fijkm; M is the average duration across all years for all ... across the years for which data were available, and 'is is the remaining (unexplained) natural year ... that mean foraging trip duration is constant for years i = 1,2,…,a prior to an impact (i.e. Mi = M0 ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 201–215 : Auteur(s): Southwell, C., J. Clarke and L.M. Emmerson

9. The foraging range of Adélie penguins at Béchervaise Island, Mac. Robertson Land, Antarctica, and its overlap with the krill fishery

   trips (two females and four males) during the incubation period (November to December 1991) and 17 trips ... (four females and two males) throughout January 1992 when birds were feeding chicks. Most birds made ... point. Birds feeding chicks also made journeys of one to two days ranging up to 12 km after 17 January ... . There is potential for overlap between the foraging range of Adélie penguins breeding along the Mac ... . 1992. The use of an automated weighing and recording system for the study of the biology of Ad6lie ... satellite tracking using the ARGOS system. Birds were tracked over four foraging trips (two females and ... two males) throughout January 1992 when birds were feeding chicks. Most birds made foraging trips to ... . Birds feeding chicks also made journeys of one to two days ranging up to 12 km after 17 January when ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 337–344 : Auteur(s): Kerry, K.R., J.R. Clarke and G.D. Else

10. Low genetic diversity and temporal stability in the Antarctic toothfish (Dissostichus mawsoni) from near-continental seas of Antarctica

    allelic frequencies for several loci compared to previously published data highlight the need for further ... locations, or between samples collected in consecutive years, were observed. These results, based on ... data on the DNA analysis of recent (2011–2013) samplings of Antarctic toothfish (Dissostichus mawsoni ... products: melt- ing at 92°C for 20 sec, annealing of primers at 55°C for 40 sec, DNA syntheses at 72°C for ... and an anonymous reviewer for valuable comments which greatly improved the readability of the ... for teaching and research–an update. Bioinformatics, 28 (19): 2537–2539. Petrov, A.F. and I.G ... isolated population of D. mawsoni seems very unlikely given the long (almost two years) pelagic stage ...

    Science Journal Paper : CCAMLR Science, Volume 21 (CCAMLR Science, Volume 21) : 1–9 : Auteur(s): Mugue, N.S., A.F. Petrov, D.A. Zelenina, I.I. Gordeev and A.A. Sergeev

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