Résultats de la recherche

1. Significant intra-annual variability in krill distribution and abundance at South Georgia revealed by multiple acoustic surveys during 2000/01

   March 2001 (late-season). The surveys were the first in a newly planned five-year series of observations ... designed to complement and extend an existing time series regularly maintained by the British Antarctic ... indices for top level predators to be compared to prey availability at more appropriate time-scales than ... observations from previous years, krill density in the western box in the mid-season survey was less than that ... planned fi ve-year series of observations designed to complement and extend an existing time series ... survey strategy for the new fi ve-year series addresses these temporal shortcomings by including ... - logical and oceanographic datasets), a new series of surveys was planned for the fi ve years 2000/01 to ... . The multiple estimates of krill density will allow reproductive performance indices for top level ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 71–82 : Auteur(s): Brierley, A.S., C. Goss, S.A. Grant, J.L. Watkins, K. Reid, M. Belchier, I. Everson, M.J. Jessop, V. Afanasyev and J. Robst

2. Vertical migrations of mackerel icefish (Champsocephalus gunnari) on the South Georgia shelf

   may be used for clarification of survey techniques used in stock assessment. For a number of years ... shelf (Parkes et al., 1989) challenge the rationale for round-the-clock trawling and call for ... migrations of mackerel icefish. The study used data from research vessels which had been fishing for ... scientists of AtlantNIRO have been conducting trawl surveys for C. gunnari during daylight hours only. File ... to the surface layers than to the bottom layers. An echo sounder was used to search for fish ... used in stock assessment. For a number of years scientists of AtlantNIRO have been conducting trawl ... improving trawl survey techniques for C. gunnari stock assessment. For a number of years scientists of ... rationale for round-the-clock trawling and call for clarification of the techniques used. The objective of ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 3–14 : Auteur(s): Frolkina, J.A. and V.I. Shlibanov

3. Revised estimates of the area of the South Georgia and Shag Rocks shelf (CCAMLR Subarea 48.3)

   should be used for future assessments and for assisting with the stratification of surveys. File ... . North east corner °S °W 0– 50 50 –1 00 10 0– 15 0 15 0– 20 0 20 0– 25 0 25 0– 30 0 30 0 ... 0 15 57 47 26 20 12 8 185 18 54.5 38 0 0 19 634 690 282 130 92 63 76 1 986 19 54.5 37 28 30 270 847 ... 1 090 448 114 38 30 23 2 918 20 54.5 36 384 251 248 690 817 284 45 7 2 0 2 728 21 54.5 35 167 444 ... used for future assessments and for assisting with the stratification of surveys. Résumé Un nouveau ...

   Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 167–175 : Auteur(s): Belchier, M. and P. Fretwell

4. Toothfish, Dissostichus eleginoides, at South Georgia

   Dissostichus eleginoides fishery at South Georgia has expanded greatly in recent years. It has been claimed ... were removed for age determination. Details of the fish are given in Table 1. Gonad samples were ... that a TAC of 1200 tonnes be set for Dissostichus eleginoides in Subarea 48.3. That estimate was based ... were content to use it as the basis for setting a TAC. The USSR opposed this view and stated that the ... longline fishery takes senescent fish. Consequently they did not agree that setting any TAC for the ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 255–261 : Auteur(s): Everson, I. and S. Campbell

5. Do krill and salps compete? Contrary evidence from the krill fisheries

   clear relationship was observed in the Elephant Island area. Possible reasons for these phenomena are ... Recently, an hypothesis of competition for primary production between salps and krill has been proposed ... Kaisha (Ltd) from 1984/85 to 1992/93 (no data were available for 1989/90 and 1991/92). Data from the ... salp densities is shown in Figure 5. The estimates for each area were standardised to February and an ... be active feeding grounds for krill, which effectively filters particles larger than 20 pm (Meyer ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 205–216 : Auteur(s): Kawaguchi, S., T. Ichii, M. Naganobu and W.K. de la Mare

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

   with an approximately linear relationship existing between depth and fish length. A statistically ... both up and down slope at particular times of year. Months with a high mean length at depth are May and ... Georgia. This concentration of large post-spawning fish may have some implications for the management of ... calculated for each haul, and an array of mean length by haul, area, depth and vessel was produced. In ... various maturity stages (Table 3). Month appears to be an important factor for males but not for females ... . Depth is an important factor for animals of maturity stage 1; as one would expect, they are restricted ... (Zhivov and Krivoruchko, 1990; Konforkin and Kozlov, 1992; see Moreno et al., 1997 for a review ...

   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

7. By-catch of fishes captured by the krill fishing vessel Chiyo Maru No. 2 in Statistical Area 58 (January to March 1995)

   variances are calculated from the delta distribution. In numbers, an average of about 14 fish were caught ... per tome of krill, and an average of about 25 fish were caught per hour of towing. In weight, an ... average of about 1.2 kg of fish were caught per tonne of krill, and an average of about 2.2 kg of fish ... were caught per hour of towing. Confidence intervals for mean by-catch estimates are wide suggesting ... , respectively, the mean and variance of the lognormally distributed observations for which X > 0. I,[x] is an ... kg of krill was subsampled for by-catch; this was an order of magnitude less than the next smallest ... 'unknown myctophids' occurred in 20% of the hauls sampled for by-catch (Table 1). Other fish species ... hauls for by-catch (recall that Table 1 includes 20 'useable' hauls). Unfortunately, sampling ...

   Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 111–123 : Auteur(s): Watters, G

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

   . There is potential for overlap between the foraging range of Adélie penguins breeding along the Mac ... foraging range of the birds at Béchervaise Island considerably exceeds the 15 to 50 km determined for birds ... their major food sources. File:  20-Kerry-et-al.pdf ... . 1992. The use of an automated weighing and recording system for the study of the biology of Ad6lie ... . There is potential for overlap between the foraging range of Adelie penguins breeding along the Mac ... foraging range of the birds at Bechervaise Island considerably exceeds the 15 to 50 km determined for ... an amount of krill up to 50% of that required by these krill predators to successfully raise their ...

   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

9. Assessment of krill flux factors in waters of South Orkney Islands during summer 1996

   1996 Abstract / Description:  This paper describes the results of an experiment conducted from 19 ... February to 7 March 1996 to assess krill flux factors in Subarea 48.2. The study area (80 x 240 n miles ... for calculating actual total biomass of krill I n recent years , m o s t s t u d i e s a i m e d ... describes the results of an experiment conducted from 19 February to 7 March 1996 to assess krill flux ... krill dans la sous-zone 48.2. La zone d'etude (80 X 240 milles) se situe a la confluence des eaux du ... , npoBonaBrrrerocz c 19 a e ~ p a n x no 7 MapTa 1996 r. n o n k ~ r o ~ nnouaflbm 80 X 240 M H n b pacnonarancx ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 195–204 : Auteur(s): Kasatkina, S.M., V.N. Shnar, M.I. Polischuk, A.M. Abramov and V.A. Sushin

10. Joint Polish/American hydroacoustic survey of Elephant Island and the vicinity of King George Island, 1988

    was 39k tonnes for a total of 299k tonnes in the combined areas. The estimated 200 kHz survey data ... bongo-net hauls (reduced speed from 6-8 knots to 3 knots for 45 min) spaced approximately every 30 n ... the Bransfield Strait south of King George Island was 39k tonnes for a total of 299k tonnes in the ... hydroacoustic cruise was conducted as a response to provide input for the CCAMLR Ecosystem Monitoring Program ... and for providing guidance to the US delegation to the CCAMLR concerning krill and other prey species ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 357–377 : Auteur(s): Macaulay, M.C.

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