Résultats de la recherche

1. Acoustic estimates of krill density at South Georgia, 1981 to 1998

   from year to year over that time, ranging from ≈ 2 to  ≈ 150 g m-2 (fresh mass). The 1982, 1991 and ... years ,90' ,982 ,9i5 ,pB ,9+ ,9s6 $6' 40% ,989 ,99' ,992 ,9@ ,9qb ,9qb ,9q6 ,992 49% Year Figure 2 ... annual (i.e. 1996, 1997 and 1998) acoustic surveys at South Georgia within two defined 80 X 100 km ... by this criterion on average in one year out of every six or seven1. Survey timing, however, may ... from a normal population (i.e. between one year out of six and one year out of seven) fall below p - o ...

   Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 47–57 : Auteur(s): Brierley, A.S., J.L. Watkins, C. Goss, M.T. Wilkinson and I. Everson

2. Estimating krill recruitment and its variability

   rate for 1+ krill (the ratio of the number of krill aged one year to the number of krill aged one year ... for 2+ krill (the ratio of the number of two-year-old krill to the number aged two and above) from ... both putative one-year-old and two-year-old age classes. Five putative age classes (components) are ... with R(t) estimated for both putative one- and two-year-old age classes. above data, and four age ... number of krill aged one year to the number of krill aged one year and above) of 0.339 with a standard ... two-year-old krill to the number aged two and above) from nine surveys is 0.552 with a standard ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 55–69 : Auteur(s): de la Mare, W.K

3. The biology, ecology and development of fishery management advice for the anomuran crabs at South Georgia (CCAMLR Subarea 48.3)

   ) 40 0– 1 60 0 13 5– 80 0 42 0– 2 50 0 60 0– 1 20 0 45 0– 60 5 Si ze ra ng e C ... 1 50 0– 4 50 0 90 0– 12 0 00 2 80 0– 8 80 0 R el at iv e fe cu nd ity ... 37°30'W 36°45'W 36°0'W 35°15'W 34°30'W 52°30'S 52°45'S 53°0'S 53°15'S 53°30 ... 'S 53°45'S 54°0'S 54°15'S 54°30'S 54°45'S 55°0'S 55°15'S 55°30'S 52°30'S 52°45'S 53°0'S ...

   Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 1–15 : Auteur(s): Belchier, M., T. Peatman and J. Brown

4. Target strengths of Antarctic krill (Euphausia superba)

   gale force on roughly one out of two days, and hurricane force about once a fortnight. Depending on ... gantry positioned over one of two identical 4 x 4 m square moon-pools on the raft. The normal operating ... lowering by a winch attached to a gantry positioned over one of two identical 4 x 4 m square moon-pools on ... over a 42-hour period. In another case, Event number 20, the number increased by two specimens ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 265–279 : Auteur(s): Everson, I., D.G. Bone, J.L. Watkins and K.G. Foote

5. Acoustic data analysis and models of krill spatial distribution

   wavenumber spectrum resembles a white noise at scales of 2-20 km, although at scales smaller than 1 km the ... distribution of krill biomass is bimodal and appears to be the mixture of two log normal distributions. These ... two distributions may correspond to the between and within patch biomass. These results of data ... animal swarm size is the one that maximized the entropy subject to given information or constraints ... - Figure 5: 80'- :r 50 40 30 201- 10H 1111111111111111111111111 0 1.5 -0.5 0.5 2.5 3.5 0 1 ... spectrum resembles a white noise at scales of 2-20 km, although at scales smaller than 1 .km the spectrum ... distribution of krill biomass is bimodal and appears to be the mixture of two log normal distributions. These ...

   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

6. A preliminary assessment of age and growth of Antarctic silverfish (Pleuragramma antarcticum) in the Ross Sea, Antarctica

   about two-thirds of the sampled fish could not be sexed. Precision estimates and age bias plots ... -growing with a moderate longevity; the maximum estimated age was 14.3 years. Von Bertalanffy parameters ... Paper Title:  A preliminary assessment of age and growth of Antarctic silverfish (Pleuragramma ... derived for both sexes combined are: L ∞ 22.1 cm SL; K 0.167 y –1; t 0 –0.4 years. Parameter estimates ... measured fresh on board and again after one year stored frozen at –20°C did not differ in length. Von ... aged Antarctic silverfish sampled from the Ross Sea. 0 5 10 15 20 25 30 35 4.0-4.5 5.1-5.5 ... 5 6 7 8 9 10 11 12 13 14 Age (years) Fr eq ue nc y Age (years) Fr eq ue nc y 50 40 30 20 ... reported here may be overestimated by one year. However, the estimated mean lengths at ages 1.3 and 2.3 ...

   Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 75–86 : Auteur(s): Sutton, C.P. and P.L. Horn

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

   estimated to be –0.6 years and residual variance 2.9. Age distributions of toothfish caught by two vessels ... Paper Title:  Age, growth and mortality of Patagonian toothfish (Dissostichus eleginoides) caught ... otoliths from reference collections were used to measure precision; relative bias for the age data was ... depth or season. Age–length keys were constructed for use in assessing toothfish catches made by ... Estimated age (years) 0 10 20 30 40 50 T ot al le ng th ( cm ) 0 20 40 60 80 100 120 140 (a ... 20 30 40 50 0 20 40 60 80 N um be r of fi sh 0 10 20 30 40 50 0 10 20 30 40 50 60 N ... estimated for reader R2. 0 10 20 30 40 50 T ot al le ng th ( cm ) 0 20 40 60 80 100 120 140 ... 0 10 20 30 40 50 T ot al le ng th ( cm ) 0 20 40 60 80 100 120 140 c) females ...

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

8. Using ecosystem monitoring data to detect impacts

   within a few years of its onset, but a fixed reference point method could have provided this sustained ... if at ≤ acrit in two or more years of a four-year refer- ence period. Summary of methods: anomalies ... . Any observation at will have one of two possible states relative to acrit. These states are α1 (at ... ‘trend’, a linear change to these parameters over the 20-year simulation period. Shift Trend Pcrit ... two out of three successive years. The reference period for Method 3 was also three years. Results ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 197–212 : Auteur(s): Hill, S.L., J. Forcada, P.N. Trathan and C.M. Waluda

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

   size from 1.5 to 3 cm). Two subsamples of 100 specimens each were taken from 50 samples and analysed ... . The fishing ground was divided into two areas: Area A, north of the South Shetland Islands; and Area B ... 419 hauls. In Area A, a unimodal size frequency distribution was found; the size range was between 30 ... spermatophore had a 36.5 mm TL, 80% of the females with spermatophores had a TL larger than 45 mm. In Area B, a ... them; sizes were between 20 and 55 mm TL and a bimodal distribution was found. Two maximum frequencies ... ' 59°55,3' 2.60 58 14 21:30 21.02.91 62°08,1' 59°51,5' 2.40 50 20 09:30 22.02.91 62°08,9' 59°56,4 ... °17,6' 2.70 50 30 18:20 03.03.91 62°26,0' 61 °17,8' 2.80 40 39 08:30 04.03.91 62°33,5' 61 °22,7' 2.90 ... :40 06.03.91 62°40,5' 61 °26,0' 2.60 40 81 17:10 07.03.91 62°41,0' 61 °21,5' 2.70 40 90 10:20 ...

   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.

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

    tonnes per fishing hour) is, however, lower than those observed for the two preceding cohorts (1979 and ... abundance of the two stocks is observed, taking into account the fact that these are juvenile fish of age ... from the Kerguelen Shelf from 1979/80 to 1988/89. S: Southern sector SE: Southeastern sector 161 ... observed for the two preceding cohorts (1979 and 1982) in a comparable period. The stock of Notothenia ... . INTRODUCTION After two seasons (1986/87 and 1987/88) of small catches (7 910 and 850 tonnes), Division ...

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

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