Résultats de la recherche

1. Distribution and relative abundance of juvenile icefish (Champsocephalus gunnari) from a trawl survey of the South Georgia shelf in June–July 1985

   mile protected zone around South Georgia to the 500 m isobath were sampled with a specially designed ... mile protected zone around South Georgia to the 500 m isobath were sampled with a specially designed ... 28 zones (strata) with depth ranges of 100-200 m, 200-300 m and 300-500 m. Tow numbers in each ... ) was employed. This trawl is made of kapron fibre netting with 20-45 mm mesh size with an inside ... station at one location was sampled with 16 tows. * the term "stratum" refers to the shelf zone of ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 55-63 : Auteur(s): Boronin, V.A., G.P. Zakharov and V.P. Shopov

2. Observations on haul-out patterns and trends in the breeding populations of southern elephant seal at Península Valdés (Patagonia) and Stranger Point (25 de Mayo - King George I.)

   they were recognized as three stocks : South Georgia, Kerguelen and Macquarie (Laws, 1960 ... reason for this decrease. One reason could be the competition with fishing fleets since the onset of ... lost during lactation (Vergani, 1986). Changes in food availability could be reflected in trends of ... area and it was used every year to collect the information. The maximum number of females at ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 453-463 : Auteur(s): Vergani, D.F., M.N. Lewis and Z.B. Stanganelli

3. Acoustic data analysis and models of krill spatial distribution

   those for krill distributions. The spectral slope of -1.66 is quite consistent with the -5/3 power ... well as fish. Krill distribution is highly variable in space and time (Marr 1962), and krill often ... -1.66 and -2.04, respectively, whereas the krill spectra were much flatter with near-zero slopes ... chlorophyll may be interpreted by the turbulence model with a slight modification by biological activities ...

   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

4. Use of indices of predator status and performance in CCAMLR fishery management

   factors potentially influencing or correlated with the changes. The relative merits and feasibilities of ... last year and with average(s) of previous years. Determine level of statistical significance of ... environment, evidence for short-term changes (year-to-year differences or trends over three to five years ... within species, sites and areas and reviewing factors potentially influencing or correlated with the ... environmental variables. This paper is concerned chiefly with the monitoring of predator species. The choice ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 353–365 : Auteur(s): Croxall, J.P.

5. Maximum entropy reconstructions of krill distribution and estimates of krill density from acoustic surveys at South Georgia, 1996–2000

   be exploited together with new known data (Sivia, 1996). Furthermore, Skilling (1988) has shown ... converge on a reconstruction that is most consistent with the observed data and for which the entropy is ... consistent with common sense (Paris, 1994). The MaxEnt technique offers an advantage over geostatistical ... . Most of the monkeys’ images will not be consistent with the data and can be ignored. All the images ...

   Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 91–100 : Auteur(s): Wafy, M.H., A.S. Brierley, S.F. Gull and J.L. Watkins

6. Modelling krill recruitment

   other parameters consistent with the observed proportional recruitment parameters. A procedure is given ... for generating families of recruitment functions which are consistent with the statistical uncertainty ... method includes the calculation of natural mortality and other parameters consistent with the observed ... which are consistent with the statistical uncertainty in the observed recruitment parameters. Resume ... estimated. MODEL DEVELOPMENT In modelling a krill population we need, in each year of a simulation, a ... size over the range of interest, the recruitment is a random variable with constant mean and variance ...

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

7. Standardization of fishing effort for Champsocephalus gunnari in the South Georgia area (Subarea 48.3)

   different classes (countries, types of vessel, fishing gear, months and years). Multiple regression is used ... Numbers: 3 2 10 10 Year Total Catch Catch Rate Prop. Mean SE Effort 1981 29464 0.249 2.083 0.765 ... changes with the passage of time. The method of standardizing fishing effort based on a multiplicative ... example, type of vessel, fishing division, month within year and finally fishing year may be considered ... certain year. A standardized value for catch-per-effort for a given type of category is calculated by ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 327–336 : Auteur(s): Gasiukov, P.S.

8. The use of predator-derived krill length-frequency distributions to calculate krill target strength

   from land-based predators directly with automated on-board data collection systems it will be possible ... with acoustic surveys of krill). In a year such as 1994, when krill length at South Georgia changed ... simultaneous length-frequency data. By integrating data from land-based predators directly with automated on ... to be independent to avoid interrelated estimates. For South Georgia, there is a 20-year time ... with research cruises. There is increasing evidence that both the population structure and ...

   Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 155–163 : Auteur(s): Reid, K. and A.S. Brierley

9. Selectivity of standard Polish commercial trawl codends on Antarctic fishing grounds

   commercial fishery, with a nominal mesh size A = 80 mm and A = 100 mm, made of double twines with a thickness ... sufficiently good level seems possible as a result of the application of webbing with permanently open meshes ... for codend construction. The most difficult matter will be preparing a codend with proper selectivity ... of 100 mm was tested. 3 . MATERIALS AND METHOD Steelon codends with a four-wall, oblique ... top down to the middle of its height with a cover having relatively small meshes (mesh bar 20 mm ... codend only from the part equipped with the cover. They were later trapped in the end parts of the cover ... carried out for two types of steelon codends used in commercial fishery, with a nominal mesh size A = 80 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 107-142 : Auteur(s): Zaucha, J.

10. Estimating optimal observer coverage in the Antarctic krill fishery

    . The South Georgia data suggest that such strategies should be pursued for at least four years before ... adult fish were recorded, with 2008 the first year that larval fish were routinely sampled, although ... observed at least once in the seven-year period, and the overlap of observed hauls with total hauls in ... the parameter of interest in this study. It was found that mean krill length varies with year ... year and vessel effect are to some degree confounded. The data were pooled over years to estimate the ...

    Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 139–154 : Auteur(s): Agnew, D.J., P. Grove, T. Peatman, R. Burn and C.T.T. Edwards

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