Résultats de la recherche

1. Commercial krill fisheries in the Antarctic, 1973 to 1988

   (April to August). Trends in the fishery with respect to independent estimates of krill abundance and ... to be associated with a high CPH in Subarea 48.2. Everson (1988) has concluded that this suggests ... until the 1973/74 season that exploitation of krill could in any way be considered to have been on a ... with the other two areas, despite the fact that both Statistical Areas 58 and 88 are substantially ... between April and August (Le. in late autumn through winter) with peak catches in June. This observed ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 229–281 : Auteur(s): Miller, D.G.M.

2. An alternative method for estimating the level of illegal fishing using simulated scaling methods on detected effort

   uncertainty increases as the evasion rate increases. This research suggests that it would be possible to ... (2005) method, and this suggests that the current method is adequate under circumstances of low evasion ... and when good knowledge exists that zero observations reflect zero illegal fishing. The new method ... by illegal activity. Both the new and the current method suffer from the fact that the observation ... comparison to be made between a dataset with known dynam- ics and values, and estimations of that dataset ... evasion (0, 0.2 and 0.5) with linear least-squares fi t. The estimation method is that of Agnew and ... ) with linear least-squares fi t. The estimation method is that of Agnew and Kirkwood (2005). 300 400 ... evasion (0, 0.2 and 0.5) with linear least-squares fi t. The estimation method is that of Agnew and ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 143–161 : Auteur(s): Ball, I

3. Sensitivity investigation of the SDWBA Antarctic krill target strength model to fatness, material contrast and orientation

   parameters, it is important that the model should be parameterised according to the potential seasonal ... . (1998) shapes with increasing fat- ness are presented in Table 3. It must be noted that the shapes do ... . Exact solutions can be achieved with analytical restrictions but at the cost of a limited range of ... changes in parameters, it is important that the model should be parameterised according to the potential ... development of the DWBA with that shape parameterisation, Demer and Conti (2003) introduced a stochastic ...

   Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 97–122 : Auteur(s): Calise, L. and G. Skaret

4. Integrating Count Effort by Seasonally Correcting Animal Population Estimates (ICESCAPE): a method for estimating abundance and its uncertainty from count data using Adélie penguins as a case study

   animal count data to a common reference point of breeding chronology for species with a complex temporal ... Population Estimates) is a suite of routines that implements a general abundance estimator accounting for ... reported measures of uncertainty associated with originally published counts are propagated through to the ... -specific estimates to be aggregated to achieve region-scale population estimates. By way of illustration ... interacts with the types of bias noted above, concerns sampling. Often, sam- ple counts will be taken from ... entire area, counts must be adjusted for the fraction of the total survey region that is searched ... relatively brief visits to sites, compared with collecting adjustment data that may require much longer ... suffi- ciently general to be relatively easily adapted for other species with similar biology. In the ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 213–227 : Auteur(s): McKinlay, J., C. Southwell and R. Trebilco

5. Preliminary model of krill fishery behaviour in Subarea 48.1

   restricted to the four months December to March, compares favourably with the historical distribution of ... Elephant Islands. The model predicts that the management option of closing the zones around Livingston and ... Elephant Islands in alternate years would result in an average yearly catch similar to that at present ... . However, in this scenario, the catch would be more concentrated in foraging areas of land-based predators ... concern that the krill fishery may compete for the krill resource with land-breeding predators (e.g ... CCAMLR might decide that it would be prudent to impose some precautionary measures to restrict the ... ) to be spent in the fine-scale square with mid-longitude X and mid-latitude y, p, , = preference ... in Subarea 48.1 fairly well, and in general produces results that would be expected intuitively ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 71–79 : Auteur(s): Agnew, D.J. and V.H. Marín

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

   for codend construction. The most difficult matter will be preparing a codend with proper selectivity ... commercial fishery, with a nominal mesh size A = 80 mm and A = 100 mm, made of double twines with a thickness ... of 4.2 mm. The studies covered 6 major fish species. It appears from the study that Antarctic icefish ... sufficiently good level seems possible as a result of the application of webbing with permanently open meshes ... collecting fish less soiled with benthos. It should be emphasized that no attention has been paid in ... hauls it could be assumed that fish in the codend will have the opportunity of direct contact with the ... construction. 4. The most difficult matter will be preparing a codend with proper selectivity properties for ... Antarctic, it was decided that selectivity studies begun in the 1978/79 season would be continued mostly on ...

   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.

7. Fish distribution and biomass in the Heard Island zone (Division 58.5.2)

   species were found to be abundant. There were two consistent areas of aggregation of Champsocephalus ... distribution, but abundance is lower and less variable with location and between surveys. Dissostichus ... waters shallower than 300 m. From these results, it seems that a small fishery of a few hundred tonnes ... each for C. gunnari and D. eleginoides may be possible. File:  01williams-delamare.pdf ... demonstrating that the Gunnari Ridge aggregation appears to be a permanent feature, other comparisons with the ... . Survey Start 22 May 1990 23 January 1992 29 August 1993 Net performance was monitored with a ... area, with the proviso that no stratum had less than five trawls. Within each stratum, trawl sites ... precautionary catch limit for each species could be calculated using a method similar to that used for the ...

   Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 1–20 : Auteur(s): Williams, R. and W.K. de la Mare

8. Distribution and population structure of Dissostichus eleginoides and D. mawsoni on BANZARE Bank (CCAMLR Division 58.4.3b), Indian Ocean.

   . mawsoni on BANZARE Bank is similar to that hypothesised for the Ross Sea population with analogous ... two species by depth may be related to physical intolerance to cooler temperatures because of the lack ... proportion to abundance, suggesting that no substantial recruitment takes place on BANZARE Bank and the ... latitudinal patterns in sexual maturity and size composition. The study indicates that the management of ... number of fish caught per 1 000 hooks for all operations. It should be noted that the different gear ... ) hypoth- esised that the reason D. eleginoides was not found in waters with surface temperatures <2°C was ... demonstrates that species-specific distribution and possible migration need to be con- sidered in the ... significantly larger than that of males (97.5–106.3 cm) (two- sample t-test; P < 0.001) for each fishing season ...

   Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 145–153 : Auteur(s): Taki, K., M. Kiyota, T. Ichii and T. Iwami

9. Trawl bag selectivity in the Champsocephalus gunnari fishery

   were carried out in June 1990 in the South Georgia area concurrently with trawl surveys as part of the ... to the limited time available for experiments, should be considered as preliminary. L 50% was 24.8 cm ... and the selectivity factor was 3.10 for a mesh size of 80 mm. Comparison of these results with results ... cm) as well as earlier sexual maturation of fish were noted. It was suggested that the use of Polish ... fishery and the specific problems to be addressed. The trawl bag was equipped with nine 5.8 m long bands ... enough to suggest that under any other conditions fish would be more able to pass through the mesh and ... the trawl bag (based on measurements of all meshes along its length) to be: • for models with ... 1990 in the South Georgia area concurrently with trawl surveys as part of the main biological and ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 295–312 : Auteur(s): Bidenko, V.G. and I.G. Istomin

10. Potential interactions between wandering albatrosses and longline fisheries for Patagonian toothfish at South Georgia

    that D. exulans breeding at South Georgia have a relatively low potential risk of interaction with ... comprehensive use, we recommend that the South Georgia longline fishery for D. eleginoides should be managed in ... other approaches that can be used to assess the magnitude and significance of potential interactions ... times of the year when the potential for albatross mortality associated with longline fishing might be ... the surviving partner may be reduced to atypically low levels (with potential prejudice to future ... a breeding site. Given that existing provisions to reduce mortality of albatrosses associated with ...

    Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 101–110 : Auteur(s): Croxall, J.P. and P.A. Prince

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