Résultats de la recherche

1. Krill fishing in the Scotia Sea in relation to bathymetry, including the detailed distribution around South Georgia

   results are discussed in relation to the ecology of krill and the fishery's interaction with local ... on fine-scale (0.5 o latitude x 1 o longitude) data show that harvesting in the Scotia Sea has been ... that there are restricted parts of shelf and shelf-break areas where high catches have been obtained ... interannual variability in the distribution of trawls. The data for 1993 were only available from August but ... to reveal aspects of an organism's ecology which cannot be elucidated with traditional ecological ... where the distribution of an organism occurs over a spatial scale larger than one that can be easily ... Orkney Islands, emphasising that similar analyses for these areas would probably be useful. Research ... South Georgia northern shelf area indicate that a shelf break front may be present during summer ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 1–17 : Auteur(s): Murphy, E.J., P.N. Trathan, I. Everson, G. Parkes and F.H.J. Daunt

2. A statistical method for estimating the level of IUU fishing: application to CCAMLR Subarea 48.3

   there must have been at least one encounter with an FPV in a year; no encounters in a year are ... ’. The encounter probability was estimated from the known encounters of FPVs with licensed vessels. The ... with IUU fishing. The mean and variance of fish catch rate was calculated for each area and each year ... highly skewed, with medians in the three years of 621, 2 852 and 550 birds respectively. 95% confidence ... 122 behaviour, which is capable of dealing with unseen IUU effort and can be used to derive ... - fi sh could potentially be caught, IUU operations moved to that area in 1996 and 1997. Since then ... develop the model presented here, and it is shown that this model can be used to esti- mate the level and ... activity increased considerably at South Georgia, with the result that after detecting a few inci- dents ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 119–141 : Auteur(s): Agnew, D.J. and G.P. Kirkwood

3. Analysis of trends in Japanese krill fishery CPUE data, and its possible use as a krill abundance index

   definitions of effort and catch-per-unit-effort (CPUE), variables were modelled using linear mixed models in ... . The results strongly suggest that the krill fishery in the South Georgia area is operating at a ... correlations with previously published interannual series of acoustic density estimates from scientific surveys ... . To refine these CPUE indices, it will be necessary to collect more detailed information from fishing ... could be used to give a catch-per-unit-effort (CPUE) index that is a good predictor of krill abundance ... the krill supply to the factory, with the result that production is constant above this point. By ... during the 2001/02 and 2002/03 seasons. Comparisons with acoustic surveys As indicated previously ... , comparisons of pre- dicted CPUE indices with acoustic densities cannot be made directly without taking into ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 1–28 : Auteur(s): Kawaguchi, S., S. Candy, S. Nicol, K. Taki and M. Naganobu

4. Diet of the Antarctic toothfish (Dissostichus mawsoni) from the Ross Sea, Antarctica (Subarea 88.1)

   bottom longline in the Ross Sea during the 2001 and 2002 fishing seasons was analysed (3 937 and 5 426 ... stomachs examined respectively). Fish sampled in 2001 were caught at depths of 317 to 2 154 m and ranged ... and ranged from 62 to 197 cm TL. A high proportion of stomachs were empty (34% in 2001 and 49% in 2002 ... identification difficult. Fish were the most important prey category (% F = 86 in 2001 and % F = 77 in 2002), in ... . mawsoni from the Ross Sea over the 2001 and 2002 summer fi shing seasons, with the aim of increasing our ... 2001 and 815–1 623 m in 2002, using Mustad autoline hooks baited with arrow squid (Notodarus spp ... . Bait, with marks indicating that D. mawsoni had been feeding on the line before capture, was present ... (34% of stomachs in 2001 and 49% in 2002). This may be due in part to a lack of food resources or ...

   Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 113–123 : Auteur(s): Fenaughty, J.M., D.W. Stevens and S.M. Hanchet

5. Effects of weather and sea-ice on the reproductive performance of the Adélie penguin at Edmonson Point, Ross Sea

   in 2003. It is suggested in this paper that the ability of penguins to cope with severe short-term ... (Pygoscelis adeliae) was studied at Edmonson Point, Victoria Land, during the 1999, 2001 and 2003 breeding ... extensive and persistent sea-ice and strong winds with snowfalls in December. First incubation trips by ... females were significantly longer than in 1999 and 2001, which in turn delayed the mean departure date of ... in this paper that the ability of penguins to cope with severe short-term weather events could be ... various localities with differing sea-ice regimes reveals that this species has developed the capacity ... 2001 (Table 1). Breeding success varied between seasons, with 2003 values well below those recorded ... 1999 2001 2003 Clutch size 1.9 1.8 1.9 (number of eggs laid/nests with eggs) (216/112) (225/123 ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 99–109 : Auteur(s): Olmastroni, S., F. Pezzo, V. Volpi and S. Focardi

6. A review of the diet and at-sea distribution of penguins breeding within the CAMLR Convention Area (submitted to the 2008 Joint CCAMLR-IWC Workshop)

   methods that could be used to fill these. File:  Ratcliffe-Trathan.pdf ... in an ecologically sensitive manner demands that catches do not depress stocks within the foraging ... areas used by predators to levels that reduce their reproductive success or survival. Spatially–explicit ... bioenergetics models that estimate the amount of prey consumed by predators are required to inform such policy ... understanding of the uncertainties that may be associated with these. Those readers wishing to extract large ... samples. A problem with this method is that fatty acids can be metabolised at different rates depending ... ., 2010). Birds that are underwater can be accounted for by combining distance sampling with mark ... digested that numbers and mass could not be determined. Nototheniidae (notably T. eulepidotus and P. ant­ ...

   Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 75–114 : Auteur(s): Ratcliffe, N. and P. Trathan

7. Changes in the fish biomass around Elephant Island (Subarea 48.1) from 1976 to 1996

   difficulties encountered in managing fisheries which exploit mixed-species assemblages, there appears to be ... from 1978/79 to 1988/89, with most of the commercial harvesting taking place in the first two years of ... in the 1980s showed that stocks of Champsocephalus gunnari, Notothenia rossii, Gobionotothen ... closure of the area in November/December 1996 suggested that the biomass of the standing stock of finfish ... managing fisheries which exploit mixed-species assemblages, there appears to be little prospect at present ... species should therefore be viewed with considerable caution. The stock was unfished in 1976 when dense ... increased again in the mid-1980s. Biomass estimates, which should be regarded with caution, however, were ... . However, we cannot exclude that with the arrival of a new fishing officer in the early 1990s changes in ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 165–189 : Auteur(s): Kock, K.-H

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

   continental shelf/slope between 46°-55°S and 60°-64°W, and around South Georgia between 53°-55°30' and 3 ... sexes were compared, and the feeding status of this species is discussed. D. eleginoides is a mixed ... ). It was also found that the diet of D. eleginoides varied in relation to its size and water depth in ... ) mentioned that D. eleginoides has been caught around the Crozet Islands, at depths of 90 to 1 020 m, with ... and 180 cm TL had stomachs with an index of 3 (Figure 5). This observation could be related to prey ... were compared, and the feeding status of this species is discussed. D. el'gitzoides is a mixed-species ... that the diet of D. elegiiloicles varied in relation to its size and water depth in both the shallow ...

   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

9. Depth distribution and spawning pattern of Dissostichus eleginoides at South Georgia

   August, and with a low mean length at depth- April and July. Examination of maturity data suggests that ... in addition to a major spawning event in late July/August, there may be a small spawning event in ... with an approximately linear relationship existing between depth and fish length. A statistically ... significant pattern of changing mean length at depth with month was detected, suggesting movement of animals ... maturity data suggests that in addition to a major spawning event in late July/August, there may be a ... August. The picture that emerges is of a species with distinct spawning times (at least two in ... ., 1995), similar t o that i n Chilean waters (July t o August; Moreno et al., 1997) a n d a r ... length at depth are May and August, and with a low mean length at depth - April and July. Examination of ...

   Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 19–36 : Auteur(s): Agnew, D.J., L. Heaps, C. Jones, A. Watson, K. Berkieta and J. Pearce

10. Estimation of natural mortality using catch-at-age and aged mark-recapture data: a multi-cohort simulation study comparing estimation for a model based on the Baranov equations versus a new mortality equation.

    estimates with that for M. In contrast, when sigmoidally shaped selectivity was simulated, and the ... model with no increase detectable for the BODE model. With these caveats, both models can be used to ... 'fully parametric' BODE model is based on the Baranov ODE while the 'semi-parametric&#039 ... ; constant catch ODE (CCODE) model uses a new total mortality ODE with constant within-year catch per unit ... rate, which must be defined given Sa with respect to the unknown Nt,a. Note that if the fishing period ... the requirement that releases should have adequate time to mix with the untagged population in order ... with that for M. In contrast, when sigmoidally shaped selectivity was simulated, and the functional ... model with no increase detectable for the BODE model. With these caveats, both models can be used to ...

    Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 1–27 : Auteur(s): Candy, S.G.

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