Résultats de la recherche

1. By-catch, growth and feeding of Antarctic juvenile fish taken in krill (Euphausia superba Dana) fisheries in the South Georgia area, in 1992

   an investigation of juvenile Antarctic fish caught during krill fishing by the FV Grigory Kovtun in ... for all trawls and for shelf trawls, respectively. For N. larseni the corresponding averages were 557 ... ). Juveniles were then analysed for taxonomic identification, stomach content, standard length (with an ... 30.05 10 240 15.10-16.00 8 000 25 31.05 90 250 09.40-10.15 7 000 2 5 03.06 10 200 16.20-17.20 2 000 20 ... from May to July 1992 in the South Georgia area. P I a a: 80- 40- 4 g 4 G - + - 60- 20- I ... (juveniles) and when they reach age l+, they eat adult E. superba. This is their preferred prey item for ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 129–142 : Auteur(s): Pakhomov, E.A. and S.A. Pankratov

2. Acoustic data analysis and models of krill spatial distribution

   descriptors of krill spatial aggregation: power spectra for krill biomass fluctuations in space, semivariogram ... wavenumber spectrum resembles a white noise at scales of 2-20 km, although at scales smaller than 1 km the ... over most distances between points except for the distances smaller than 1 km. The computed frequency ... and plays an important role in supporting animal populations such as whales, seals and penguins as ... swarms have a diameter smaller than 200 m and that the observed biomass is an average for a 200 m trace ... (cycles/km) Power spectra for krill at the 2-20 km scale observed in this analysis (line) and by Weber ... - Figure 5: 80'- :r 50 40 30 201- 10H 1111111111111111111111111 0 1.5 -0.5 0.5 2.5 3.5 0 1 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 311–329 : Auteur(s): Morin, A., A. Okubo and K. Kawasaki

3. On the instantaneous natural mortality rate of Champsocephalus gunnari, South Georgia (Subarea 48.3)

   composition of catches from 1964/65 to 1968/69 and the age/length key for the first half of 1972 were used in ... the calculations. The results provided a wide range of estimates for M. The discussion of the results ... suggested that M =0.56 should be used in stock assessment for C. gunnari in Subarea 48.3. File:  19-Frolkina ... 1968/69 and the age/length key for the first half of 1972 were used in the calculations. The results ... 0.55 (Frolkina and Dorovskikh, 1989) for M. This research was carried out using age/length ... from the seasons 1964/65 to 1968/69 were used (Table 1) as was the age/length key for the first half ... M were carried out using data for each individual season and for the entire period. Age composition ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 313–326 : Auteur(s): Frolkina, G.A. and R.S. Dorovskikh

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 ... birds, or (c) 30 birds each year. Change detected for three to five years of monitoring after change ... than 30 birds each year. This is the case for both one- and two-tailed tests with a power greater ... 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. On reproduction of Electrona carlsbergi (Tåning)

   WG-FSA-90/20 ON REPRODUCTION OF ELECTRONA CARLSBERGI ... in experimental conditions to count for E. carlsbergi the number of eggs in one batch. An attempt ... Condition Stage (mg) Coefficient (%) I 12-30 0.1-0.2 Oogonia Juvenile IT 40-90 0.5-1.1 Oogonia ... the Antarctic Convergence, wherein it forms concentrations during the major part of the year (Hulley ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 397–409 : Auteur(s): Mazhirina, G.P.

6. Size and density of krill layers fished by a Japanese trawler in the waters north of Livingston Island in January 1988

   10 20 30 40 50 60 70 80 NET V 0 L U MED ENS IT Y ( g. m-3 ) Figure 3: Frequency distributions of ... -operative survey between RV Kaiyo Maru and a Japanese trawler was conducted from 17 to 20 January 1988 on ... the fishing ground north of Livingston Island (Figure 1). A total of 30 experiments on TS measurement ... including 30 co-operative experiments, was provided by the trawler. The number of krill aggregations per ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 339–345 : Auteur(s): Endo, Y. and Y. Shimadzu

7. Preliminary analyses of data collected during experimental phases of the 1994/95 and 1995/96 Antarctic crab fishing seasons

   suggested that depletion estimators will not be appropriate tools for estimating local abundances of P ... liberty for about one to five weeks. The recaptured crabs had minimum movement rates of 0.08 to 0.25 n ... miles/day. Mark-recapture estimates of standing stock and density were made for the area around Phase 2 ... attempts were made to account for biased sampling of recaptured crabs and the movement of crabs away from ... experiments, CCAMLR INTRODUCTION The Commission has adopted an experimental harves t regime (EHR) for ... extended (in a slightly revised format) for another three f ishing seasons (to the 1997/98 split-year ... ) provided a formula for making an unbiased estimate of population size ( 6 ) from mark-recapture data ... as unmarked crabs; in Table 5. An attempt was made to account for Movement Rate (n mile/day) 0.08 ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 141–159 : Auteur(s): Watters, G

8. Estimating unaccounted fishing mortality in the Ross Sea region and Amundsen Sea (CCAMLR Subareas 88.1 and 88.2) bottom longline fisheries targeting Antarctic toothfish

   counted in estimates of total fishing removals or otherwise accounted for in stock assessment models. The ... average 208 tonnes of Antarctic toothfish mortality may be unaccounted for annually. While the current ... incorporated as sensitivity analyses in the 2011 stock assessments for the Ross Sea region and Subarea 88.2 ... gear was used for this analysis. There is also an ‘other hooks lost’ field, which reports ‘hooks lost ... data were then used to estimate hook loss for the entire area on an annual basis and sep- arately for ... that it was highly unlikely that an individual vessel operating in the Ross Sea region could fish for ... from the analysis. If a vessel reported any non-zero value for lost hooks in any year, then any ...

   Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 17–30 : Auteur(s): Webber, D.N. and S.J. Parker

9. Food and feeding of the mackerel icefish (Champsocephalus gunnari) around South Georgia in January/February 1991

   stomachs and the feeding intensity were uncommonly low in a period when energy rich food is needed for the ... to 3 877) and an unrepresentative coverage of the shelf from year to year. However, two pairs of ... superba ~ Themisto gaudi. Mysidacea [%] 160 140 120 100 80 60 40 20 0 Month 11-111 11 ... needed for the final maturation of the gonads. Resume La composition du regime alimentaire et ... ). An unusually high proportion of sexually mature fish showed no signs of the gonad development ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 15–23 : Auteur(s): Kock, K.-H., I. Everson, S. Campbell, G. Parkes, Z. Cielniaszek and J. Szlakowski

10. Defining smaller-scale management units to further develop the ecosystem approach in managing large-scale pelagic krill fisheries in Antarctica

    define predator units. The derived conceptual model is then used to formulate an approach for developing ... the principles and approach required for developing small-scale management units to take account of ... predators’ needs when managing the fishery for Antarctic krill. It provides a theoretical foundation for ... ecosystem but should be sufficiently independent for fishing in that unit not to inadvertently affect ... conceptual model is then used to formulate an approach for developing fi sheries on prey species, notably ... of predators in an ongoing management framework for a fully developed fi shery (Constable et al ... been resolved, despite early consideration of the options that could be used to provide for an ... subdivided in Area 48 to better account for the needs of predators (SC-CAMLR, 2000a). An important issue to ...

    Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 117–131 : Auteur(s): Constable, A.J. and S. Nicol

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