Résultats de la recherche

1. The role of fish as predators of krill (Euphausia superba) and other pelagic resources in the Southern Ocean (submitted to the 2008 Joint CCAMLR-IWC Workshop)

   :  Krill forms an important part of the diet of many Antarctic fish species. An understanding of the role ... when these areas were exploited commercially for Electrona carlsbergi. Currently, the best estimates of ... by mesopelagic fish in the Atlantic sector of the Southern Ocean. It is clear from this review that ... Southern Ocean. Ecosystem models therefore need to account for their role. However, several key areas of ... estimates of fish stocks were available for the split-years (1 July to 30 June) 1975/76 and 1977/78 (Table ... resource for skates and slope and deep-sea fishes such as grenadiers at certain times of the year ... fast ice, including flaws, leads and polynyas) for most of the year (Kock, 1992). The shelf and ... pro- vided in Table 4. Non-myctophid species The only other species of mesopelagic fish for which ...

   Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 115–169 : Auteur(s): Kock, K.-H., E. Barrera-Oro, M. Belchier, M.A. Collins, G. Duhamel, S. Hanchet, L. Pshenichnov, D. Welsford and R. Williams

2. Distribution of krill (Euphausia superba Dana) catches in the South Shetlands and South Orkneys

   catch in Subarea 48.1 from December to March was taken within 40 km of the coast, and 90% within 80 km ... , foraging ranges and population sizes from the literature are used to show that for some years catches ... South Orkneys Abstract / Description:  A set of concentric zones of 20 km width was defined around ... . Krill catches in these zones are shown to have a consistent pattern in Subarea 48.1 but an unpredictable ... for Subareas 48.1 and 48.2. 100 90 80 .c. 70 J:! tfJ 0 () 50 -0 40 a-e 30 20 10 ... March was taken within 40 km of the coast, and 90% within 80 km in all years 1988 to 1991. In 1987 ... was similar for each of the years examined whereas that for Subarea 48.2 changed each year (Figures 3 ... effectuee a moins de 40 km de la cote, et 90% a moins de 80 km de 1988 a 1990. En 1987 et 1988, de decembre ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 287–303 : Auteur(s): Agnew, D.J.

3. Supplementary data on exploited stocks in Division 58.5.1 (Kerguelen)

   Island) have made possible a review of the status of the various harvested fish stocks. Since 1984, an ... tonnes per fishing hour) is, however, lower than those observed for the two preceding cohorts (1979 and ... increase has been recorded recently, accompanied by an increase in the abundance index, following a ... 3.16 .104, which is lower than the values observed, for an equivalent age, for the 1979 (4.40) and ... (at the age of 5 to 6 years) of these juveniles on the shelf. A catch limited to by-catches has ... which confirms the hypotheses of an abundant recruitment every three years corresponding to the first ... =33.4 cm), very close to average length at sexual maturity (33.5 and 33.8 cm at the age of 9 years ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 147–161 : Auteur(s): Duhamel, G.

4. Precautionary spatial protection to facilitate the scientific study of habitats and communities under ice shelves in the context of recent, rapid, regional climate change

   existing ice shelves in Subareas 88.3, 48.1 and 48.5 should be preserved and protected for scientific study ... collapse in the future. Designation of areas under ice shelves as areas for scientific study would fulfil ... . Fleming, BAS, pers. comm.), so the frequency of revision is an opera- tional question for CCAMLR. The ... elapsed; however, it may also be appropriate for an area where an ice-shelf retreat or collapse has ... the objectives of the CAMLR Convention for pro- tecting scientific reference areas. It would also be ... constructive comments and to Alex Rogers, Stefan Hain, Dave Barnes and Paul Holland for helpful advice on an ...

   Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 139–151 : Auteur(s): Trathan, P.N., S.M. Grant, V. Siegel and K.-H. Kock

5. 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 ... allelic frequencies for several loci compared to previously published data highlight the need for further ... 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 ...

   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

6. Is current management of the Antarctic krill fishery in the Atlantic sector of the Southern Ocean precautionary?

   conservatively estimated subarea biomass in up to 20% of years due to high variability in krill biomass indices ... about the state of the regional krill stock. In this region, krill fishing is permitted in an area of ... approximately 3.5 million km 2 which is divided into four subareas (labelled Subareas 48.1 to 48.4) for ... 1991, is 0.62 million tonnes year –1, equivalent to ~1% of the regional biomass estimated in 2000. Each ... of 32 years for the sector 10°E to 90°W (Atkinson et al., 2014). It is unclear how the observed ... for 20 years would reduce the krill stock by 2% (SC-CAMLR, 2011). Clearly, any significantly greater ... tonnes year–1, since 2009. There is some evidence for a decline in the abundance of krill in the 1980s ... exploitation rate (the percentage of an initial biomass that can be caught each year) of 9.1%. The inputs to ...

   Science Journal Paper : CCAMLR Science, Volume 23 (CCAMLR Science, Volume 23) : 31–51 : Auteur(s): Hill, S.L., A. Atkinson, C. Darby, S. Fielding, B.A. Krafft, O.R. Godø, G. Skaret, P.N. Trathan and J.L. Watkins

7. Estimates of fish stock biomass around South Georgia in January/February 1985

   reduction in stock size to 10 – 20% of that estimated before the onset of heavy fishing. In C. gunnari the ... fishery is dependant on the abundance of the recruiting year class. Conservation measures adopted by ... were seen domi na ted by 3 years old. fish (age class II) which is presumably the recruit i ng year ... & BUREAU, 1984, table 50). 3.4 Champsocephalus gunnari Except for one haul yield i ng 1. 4 t/30 min ... in stock size to 10 - 20 % of that estimated for 1975/76. Similar values had, however, been found ... direc- t ed fishing for the species for two years on the premises of a normal recruit- ment. Minimum ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/2 (Selected Scientific Papers, SC-CAMLR-SSP/2) : 1-32 : Auteur(s): Kock, K.-H.

8. Quantifying movement behaviour of vessels in the Antarctic krill fishery

   analyses demonstrate the need for high-quality year-round data on all vessels participating in the krill ... /haul, and the travel distance decreased as the catch level increased; this pattern was most obvious for ... number of fishing grounds within this area. The same patterns were observed for vessels from other ... nations, but were less clear. The study suggests the movement trends for Japanese vessels could form the ... krill fishery is essential for an ecosystem-based approach to managing the effects of fishing on ... of each haul, assuming 60 n miles for one degree latitude and 30 n miles for one degree longi- tude ... been made within a 30 n mile radius by the total number of haul pairs. For this calculation, travel ... bins from 0 to 30 tonnes (and greater). The predictor variable, x, was defined as the mean catch for ...

   Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 131–148 : Auteur(s): Kawaguchi, S. and S.G. Candy

9. CCAMLR ecosystem monitoring and management: future work

   :  Harvesting of marine living resources in the Southern Ocean is managed by the Commission for the Conservation ... of Antarctic Marine Living Resources (CCAMLR). CCAMLR is widely known for its ecosystem approach to ... system, (ii) methods for assessing the status of the system, (iii) decision rules on how to adjust ... for dealing with uncertainty. This paper reviews progress in developing ecosystem-based management ... . In conclusion, a work plan for the development of an ecosystem-based management procedure is ... description). An early review of the program indicated that the results would vary in their value to ... krill (see Constable et al., in press for review); (ii) population models of krill (e.g. Constable et ... estimates of parameters. For the purposes of developing an ecosystem- based management procedure, plausible ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 233–253 : Auteur(s): Constable, A.J

10. Diet study of Antarctic toothfish caught in the east Antarctic based on stomach content, fatty acid and stable isotope analyses

    for Antarctic toothfish (Dissostichus mawsoni) in the small-scale research unit (SSRU) 5841C in the ... between them. δ 15 N values of Antarctic toothfish were higher than for the other species collected ... , 1987; Michener and Schell, 1994). δ13C in an animal usually occurs within 1‰ compared with that of ... (14%). The mixture was shaken, sealed under nitrogen and then heated on a hot block at 100°C for 30 ... FAME classes. Nitrogen was used as a carrier gas. The GC temperature was pro- grammed from 50°C for 1 ... min, ramping to 150°C at 30°C min–1, and holding at 250°C for 10 min after ramping at 2°C min–1. The ...

    Science Journal Paper : CCAMLR Science, Volume 22 (CCAMLR Science, Volume 22) : 29–44 : Auteur(s): Park, H.J. , I. Yeon, E. Han, Y.J. Lee, S.M. Hanchet, G.W. Baeck, Y. Kwon, S.G. Choi, D.W. Lee and C.K. Kang*

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