Résultats de la recherche

1. Feeding patterns of nine species of Antarctic fish and assessment of their daily food consumption

   station was carried out in the Kosmonavtov Sea (67°50'S; 41°24'E) in March 1988. All samples ... Trematomus eulepidotus- planktivorous species with euphausiids, mainly Euphausia superba, being the staple ... forms of polychaetes, with Euphausia superba also comprising a considerable portion of its diet; (iii ... be about five times their body weight. File:  20-Pakhomov-and-Tseitlin.pdf ... a given time, t - time, A - constant. (1) From equation (1) it follows that the amount of food ... ) - amount of food at time t = O. 323 Equation (2) clearly shows that 90% of food is evacuated over a ... - planktophagic species with euphausiids, mainly Euphausia superba, being the staple food. T. eulepidotus also ... of T. hansoni in two consecutive samples. If one assumes that schooling patterns are determined by ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 321–333 : Auteur(s): Pakhomov, Y.A. and V.B. Tseitlin

2. Biogeographic patterns of benthic invertebrate megafauna on shelf areas within the Southern Ocean Atlantic sector

   the Weddell water masses that meet and mix in this region. Evident at smaller spatial scales are the ... total biomass data and the composition of phyla that contribute to that biomass. An examination of ... apparently be separated into zones based on the physical properties of the Antarctic Circumpolar Current and ... great that only a portion of the catch could feasibly be transferred into baskets for weighing and ... and Jones 172 Despite the fact that this region can be geo- graphically delimited quite clearly ... . However, it should be noted that there is no data between the three areas from the south to the east ... shelf, and that this may be one continuous region of relatively high biomass. Compositional data on ...

   Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 167–192 : Auteur(s): Lockhart, S.J. and C.D. Jones

3. Age, growth and mortality of Patagonian toothfish (Dissostichus eleginoides) caught off Kerguelen

   sexes were found, estimating von Bertalanffy parameters for males to be L ∞ = 95.9, K = 0.12, t 0 = –4.6 ... estimated to be –0.6 years and residual variance 2.9. Age distributions of toothfish caught by two vessels ... showed discrepancies due to gear-specific catchability, or differences in the available population with ... trawlers and longliners at Kerguelen, and longevity was estimated to be 36 years. Total instantaneous ... , 2001). The revealed section was fi ne-ground and polished using a Crystalmaster 8 Machine with 30M ... processed otoliths con- stitute a reference set for D. eleginoides caught off Kerguelen, that can be used ... R2 showed little expansion in residual variance with age, indicating that error was principally due ... (Ashford, 2001): yij = µ + τi + bj + eij (1) i = 1,2...t; j = 1,2...r where µ = the general mean, τi ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 29–41 : Auteur(s): Ashford, J., G. Duhamel, C. Jones and S. Bobko

4. Evaluation of the results of trawl selectivity experiments by Poland, Spain and USSR in 1978/79, 1981/82 and 1986/87

   species were calculated. It is recommended that introduction of these mesh sizes should be considered for ... species were calculated. It is recommended that introduction of these mesh sizes should be considered for ... (Figure 1). It should be noted, that the selection curve for 7 mm twine is not well defined and SF point ... presented relationship should be taken with care. Thirty minute hauls in the Spanish experiment gave ... (Tables 7 and 8) that 68 mm mesh is far too small. Also 88 mm mesh seems not to be adequate to ensure ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 163–196 : Auteur(s): Slosarczyk, W., E. Balguerias, K. Shust and S. Iglesias

5. Assessment and tag program adaption methods for exploratory fisheries in the CAMLR Convention Area: an example application for Division 58.4.3a

   exploratory stocks in the CAMLR Convention Area. The assessment methodology is designed to be able to ... abundance estimator, is defined whereby catch limits and tagging rates can be adjusted together to define ... tagging levels that will produce an expected abundance estimate in the following year of a given precision ... eleginoides) in Division 58.4.3a with catch limit and tag-rate recommendations being made given the assessment ... would be useful to have a simpler alternative framework that can deal with less-detailed data but will ... variation would then be given by ˆ 1 2 1 T R C R CV N T R C (11) if one assumes that N >> 1. The ... defined whereby catch limits and tagging rates can be adjusted together to define tagging levels that ... -structured stock assessments, of differing features and com- plexities, that can deal with the large amount ...

   Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 101–113 : Auteur(s): Hillary, R.M

6. Antarctic krill and ecosystem management – from Seattle to Siena

   to be consistent with the objectives of the CAMLR Convention, particularly its Article II. Emphasis ... (2002 – this volume), with the three papers documenting developments during CCAMLR’s first 20 years of ... required above that currently forthcoming from the krill fi shery. Only with such information will it be ... the ‘ecosystem approach’ and clearly indicated that precaution should be applied to minimise the ... required that: (i) harvested populations should be assessed and monitored; (ii) ecological interactions ... • the carrying capacity for a low trophic level species such as krill is unlikely to be constant. With ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 175–212 : Auteur(s): Miller, D.G.M

7. Environment–krill relations in the South Georgia marine ecosystem

   be a useful index for some regions. Associations with ice-edge position and atmospheric components ... variability and it is only recently that physical datasets have been generated for the Southern Ocean. In this ... atmospheric components of the system, and there are also correlations with CPUE data. The CPUE index generally ... agrees with other data which give direct or indirect indications of krill availability, suggesting it can ... , that there appears to be consistency between years with declining values over a number of years until ... , suggesting it can be a useful index for some regions. Associations with ice-edge position and atmospheric ... fisheries suggested that simple application of such indices would not be useful (Butterworth, 1988; Mangel ... spent fishing by vessels of each shipowner. It should also be borne in mind that the intensity and ...

   Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 13–30 : Auteur(s): Fedoulov, P.P., E. Murphy and K.E. Shulgovsky

8. Experimental evaluation of the effectiveness of weighting regimes in reducing seabird by-catch in the longline toothfish fishery around South Georgia

   intervals should be used. Results suggested that seabird by-catch on lines using effective weighting regimes ... for toothfish (Dissostichus spp.). Three regimes were examined, with weights of 4.25, 8.5 and 12.75 kg ... may be even further reduced where all lines being set in the vicinity use effective line-weighting ... conditions may be held as constant as possible within experiments, the ability to separate treatment effects ... kg at 40 m intervals should be used. Results suggested that seabird by-catch on lines using ... , longlines were set during the day so that birds would be caught; however, all other provisions of ... interact with the vessel during setting operations. From early sets it was found that the high number ... were evenly distributed on normal quantile plots. The number of effects that could be considered was ...

   Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 119–131 : Auteur(s): Agnew, D.J., A.D. Black, J.P. Croxall and G.B. Parkes

9. Marine mammals and demersal longline fishery interactions in Crozet and Kerguelen Exclusive Economic Zones: an assessment of depredation levels

   of 103 individual whales to be identifi ed. The analysis of photoidentification indicated that a ... whales. These two species, alone or in co-occurrence with each other, were observed in 71% of the 1 308 ... two species, alone or in co-occurrence with each other, were observed in 54% of the 6 262 longlines ... marine mammal species alone or in co-occurrence. In the Crozet EEZ, CPUE was found to be reduced by 22.5 ... of 103 individual whales to be identifi ed. The analysis of photo- identifi cation indicated that a ... with the killer whale depredation on longlines. Indeed, observers reported that Crozet archipelago ... interacting with the fi shery: sperm whales, killer whales and fur seals. Both single- and mixed-species ... . gazella) breed, and it would be possible for both species to interact with the fi shery. Therefore, in ...

   Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 67–82 : Auteur(s): Roche, C., C. Guinet, N. Gasco and G. Duhamel

10. Fitting Euphausia superba into Southern Ocean food-web models: a review of data sources and their limitations

    of each method of sampling krill, i.e. with nets (for historical time series, demographic information ... recommended. Observations that krill occupy the underice layer, the 0–10 m layer, the deeper water column and ... recruitment. This variability masks top–down predation controls that may operate over multi-decadal scales ... that they are not currently birds or mammals. Krill feed across three trophic levels and can control ... mortality has recently been challenged, with food- web analyses using Ecopath showing that fish may be much ... predictions on population changes that might be occurring as a result of natural variability, past or ... of zooplankton nets. This paper suggests that underestimates are likely to be well within an order ... ). A major limitation of net sampling is the tiny fraction of the total survey volume that can be ...

    Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 219–245 : Auteur(s): A. Atkinson, S. Nicol, S. Kawaguchi, E. Pakhomov, L. Quetin, R. Ross, S. Hill, C. Reiss, V. Siegel, G. Tarling (submitted to the 2008 Joint CCAMLR-IWC Workshop)

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