Résultats de la recherche

1. Krill population biology during the 1991 Chilean Antarctic krill fishery

   419 hauls. In Area A, a unimodal size frequency distribution was found; the size range was between 30 ... and 55 mm TL, with a mean TL of 45 mm for females and 48 mm for males. A very weak mode for juvenile ... spermatophore had a 36.5 mm TL, 80% of the females with spermatophores had a TL larger than 45 mm. In Area B, a ... TL (mean length 43 mm for females and 46 mm for males), and the other (modal length 32 mm) for ... between 30 and 55 mm TL, with a mean TL of 45 mm for females and 48 mm for males. A very weak mode for ... other (modal length 32 mm) for juvenile specimens between 20 and 39 mm TL. Females comprised 47.1 ... length mode of specimens between 30 and 55 mm TL, a mean TL of 45 mm for females and 48 mm for males ... ) for juvenile specimens (sex undetermined) between 20 and 39 mm TL (Figure 4). Females were also more ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 223–235 : Auteur(s): Mujica R., A., E. Acuña S. and A. Rivera O.

2. Otolith and body size relationships in bigeye grenadier (Macrourus holotrachys) in CCAMLR Subarea 48.3

   size models should be derived for each fish population under investigation. The length of fish chosen ... grenadier, Subarea 48.3 0 10 20 30 40 50 60 70 80 90 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 ... equations of the fi tted lines are given in the text. 90 80 70 60 50 40 30 20 10 0 40 35 30 ... from Heard and Macquarie Islands. 0 10 20 30 40 50 60 70 80 90 10 12 14 16 18 20 22 Otolith ... Length (mm) Fi sh T ot al L en gt h (c m ) 90 80 70 60 50 40 30 20 10 0 Fi sh to ta ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 133–143 : Auteur(s): Morley, S. and M. Belchier

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

   variability and it is only recently that physical datasets have been generated for the Southern Ocean. In this ... northeastern Scotia Sea around South Georgia for the period from 1974 to 1992. These indices were examined in ... be a useful index for some regions. Associations with ice-edge position and atmospheric components ... were only expressed strongly in years of extreme conditions. The correlation with water temperature was ... longitudes 20°, 30°, 40' and 50°W. For the period 1973 to 1989, a further sea-ice dataset was available ... 0 73 74 75 76 7 7 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 Year Figure 3: Variation in ... : (a), (b), (c) - in the same year; (d) - ice-edge position at 30°W averaged for December-January and ... from standard meteorological charts of the South Atlantic for the 26-year period from 1965 to 1991 ...

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

4. The error of the biomass estimate as a function of survey parameters and the statistics of a density field of krill aggregations

   is determined as the product of the average density for the region under examination and the area of ... this region. For a hydroacoustic survey, the anisotropy parameters correlation radius along transects ... (sections) serve as survey parameters. The relationships described here can be used in practice for both a ... posteriori estimation of the error made when calculating the biomass, and for survey planning on the basis of ... mentioned, in practice there usually takes place an inverse relation between deterministic and random ... estimating biomass. 4. Conclusion Results mentioned here can be used in practice both for a posteriori ... product of the average density for the region under examination and the area of this region. For a ... parameters. The relationships described here can be used in practice for both a posteriori estimation of ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 213-228 : Auteur(s): Kizner, Z.I.

5. Modelling krill recruitment

   Paper Title:  Modelling krill recruitment Abstract / Description:  A method is developed for using ... for generating families of recruitment functions which are consistent with the statistical uncertainty ... to Justin Cooke and an anonymous reviewer for (30) helpful comments on the draft text of the paper ... parameter we need to fix for the krill model is the rate of natural mortality (M) . In an unexploited ... to age n, and infinite thereafter, then in an equilibrium population the R(t) rate is: S can be ... model is exercised for n years without exploitation prior to calculating the mean unexploited ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 49–54 : Auteur(s): W.K. de la Mare

6. Biology and harvesting of Dissostichus eleginoides around the Kerguelen Islands (Division 58.5.1)

   (Division 58.5.1) Abstract / Description:  Dissostichus eleginoides is becoming an increasingly important ... from year to year and highly dependent on the harvestable resources of Champsocephalus gunnari. Vital ... biological information on population dynamics, as well as demographic structures and trends observed in an ... abundance index, is provided. Prospects for exploitation are discussed with respect to the development of ... well as demographic structures and trends observed in an abundance index, is provided. Prospects for ... sont indiques entre parentheses. 1979/80 it 1983/84 1984/85 it 1988/89 1989/90 it 1990/91 (5 ans ... ................................. " .................. . 20 40 60 80 Lt (2crIl interval) 250 - 350 m -+- 350 - 450 m n=235 n=1069 100 120 -*- 450m ... S0 90 188 110 128 130 30 40 50 S8 78 S8 90 la8 118128 138 Longueur totals

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 85–106 : Auteur(s): Duhamel, G.

7. Analysis of the diet of Champsocephalus gunnari at South Georgia in late summer from 1994 to 1997, Dr Eduardo L. Holmberg surveys

   well as fish, was only occasional or negligible and varied from year to year. The spatial distribution ... /without food in Subarea 48.3, did not show a consistent pattern from year to year.  Likewise, in the four ... length of C. gunnari did not reveal any selectivity pattern for any of the prey items. The availability ... and Thysanoessa sp., which are known to be important alternative food in years of krill scarcity, as ... (nearly 80% of mature fish) is in the range known for years of high food availability (75-85%), in ... frozen at -30°C and later examined at the Instituto Antiirtico Argentino. For the aim of this study ... : the dietary coefficient (Q%) showed a greater importance of T. gaudichaudii (75-80%) than krill (20 ... definite spatial pattern, except for an apparent higher concentration of krill in the southeastern part ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 103–123 : Auteur(s): Barrera-Oro, E., R. Casaux and E. Marschoff

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

   for toothfish (Dissostichus spp.). Three regimes were examined, with weights of 4.25, 8.5 and 12.75 kg ... PRO 32 34 47 18 45 50 45 30 47 21 42 29 42 70 39 48 42 3 8 40 10 9 4 45 7 47 17 14 3 ... which has participated in the longline fishery around South Georgia for the past several years, and ... longlines fishing for toothfish (Dissostichus spp.). Three regimes were examined, with weights of 4.25,8.5 ... , weighting regime, toothfish, seabirds, by-catch reduction, CCAMLR INTRODUCTION Longline fishing for ...

   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. Comparison of two methods to assess fish losses due to depredation by killer whales and sperm whales on demersal longlines

   aimed at providing two indirect methods of assessment of depredated biomass over an 11-year period (2003 ... depredation occurs on fish in the marine environment. This is the case for killer whales (Orcinus orca) and ... to 2013), accounting for spatial variations of depredation levels. In the first method, fishing data ... comparable results and thus strong support for the CPUE method. From these two methods, depredation rates ... biomass over an 11-year period (2003 to 2013), accounting for spatial variations of depredation levels ... grenadier proportion. The ideal case would be an exact 50% proportion for both spe- cies to best detect ... , represented less than 20% of all cells (Cd + Cu). Out of 145 cells in total, 83 were used for killer whales ... Patagonian toothfish represents an equivalent of US$ 2.5–2.9 million of fish value per year based on the ...

   Science Journal Paper : CCAMLR Science, Volume 22 (CCAMLR Science, Volume 22) : 1–14 : Auteur(s): Gasco, N., P. Tixier, G. Duhamel and C. Guinet

10. Commercial fishing vessels as research vessels in the Antarctic – requirements and solutions exemplified with a new vessel

    readily available for conventional coverage of harvested stocks and their ecosystems. This paper describes ... fishing and research vessel could make a large amount of important data available for both management ... , through CCAMLR, and the broader scientific community and thus improve the basis for resource evaluation ... dramatically over its 30- to 40-year history. The present annual catch in the Atlantic sector of the Southern ... low-temperature freezers (~ –80°C), will also need to be considered. Adequate working space for data ... scientific use when the vessel is new. In general, space for a 20 ft container laboratory van would be ... important factors for an efficient trawling strategy. Further, such perfor- mance is also crucial for ...

    Science Journal Paper : CCAMLR Science, Volume 21 (CCAMLR Science, Volume 21) : 11–17 : Auteur(s): Godø, O.R., C. Reiss, V. Siegel, J.L. Watkins

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