Résultats de la recherche

1. Catch-at-age analysis applied to new fisheries: the case of Dissostichus eleginoides

   develop a comprehensive sampling design which will provide data in line with assessment procedures that ... Dissostichus eleginoides off the south of Chile which is being conducted in accordance with CCAMLR regulations ... which will provide data in line with assessment procedures that are quite similar to those commonly ... south of Chile which is being conducted in accordance with CCAMLR regulations. Resume L'approche de ... , managed so as to collect series of data which can be analysed in conjunction with stock dynamics models ... information from scientific research programs. From the point of view of a developing country, this option ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 3–9 : Auteur(s): Zuleta, A.V. and C.A. Moreno

2. Depth distribution and spawning pattern of Dissostichus eleginoides at South Georgia

   both up and down slope at particular times of year. Months with a high mean length at depth are May and ... with an approximately linear relationship existing between depth and fish length. A statistically ... significant pattern of changing mean length at depth with month was detected, suggesting movement of animals ... August, and with a low mean length at depth- April and July. Examination of maturity data suggests that ... , suggesting movement of animals both up and down slope at particular times of year. Months with a high mean ... distributed down the shelf slope with an approximately linear relationship existing between depth and fish ... length. A statistically significant pattern of changing mean length at depth with month was detected ... length at depth are May and August, and with a low mean length at depth - April and July. Examination of ...

   Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 19–36 : Auteur(s): Agnew, D.J., L. Heaps, C. Jones, A. Watson, K. Berkieta and J. Pearce

3. 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 ... interact with the vessel during setting operations. From early sets it was found that the high number ... weight per 40 m (Table 3). Giant petrels appeared to be at very low risk when lines were set with ... longlines fishing for toothfish (Dissostichus spp.). Three regimes were examined, with weights of 4.25,8.5 ... the major finfish fisheries in Antarctic waters. Early reports from the fishery recorded high levels ...

   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

4. On the power to detect changes using the standard methods for monitoring parameters of predatory species

   trip duration (C2.0). The other Standard Methods are not evaluated because the power analysis in the ... by an inverse relationship between trip duration and number of trips. That is, if a bird with a ... estimates of the variance of trip duration for an individual bird, the covariance of trip duration with ... monitoring scheme is a nested design with the complication that trip duration and number of trips made by an ... computing the overall mean trip duration for the year. Using that method on data from Seal Island, the ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 377–397 : Auteur(s): Boveng, P. and J.L. Bengtson

5. Some thoughts on precautionary measures for the krill fishery

   /81 season, over a decade ago, which means that with a lifespan of five to seven years, at least two ... spawning biomass dropping below 20% of its pre-exploitation median level over a 20-year harvesting period ... is 10%; and the median krill escapement1 in the spawning biomass over a 20-year period is 75% of ... predators. A major difficulty with this approach is that CCAMLR subareas, such as 48.3, are known to be ...

   Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 1–11 : Auteur(s): Everson, I. and W.K. de la Mare

6. Seabird mortality in the Patagonian toothfish longline fishery around Crozet and Kerguelen Islands, 2001–2003

   killed species, with males being more frequently caught than females. Grey petrels (Procellaria cinerea ... petrels and grey petrels is explained by the time of year, geographical area and type of longliner (manual ... baited longlines. Based on the results of this analysis, several recommendations are made with the aim of ... vessels was very heterogeneous according to the year, the EEZ and the month, with fi shing pressure much ... with vessel type: automatic versus manual baiting Fishing effort varies considerably during a year ... ). Irrespective of year, fewer seabirds were observed to be caught in summer, with a more marked difference in ... grey petrels caught was affected by moon brightness (Figure 10) irrespective of year, with more ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 53–80 : Auteur(s): Delord, K., N. Gasco, H. Weimerskirch, C. Barbraud and T. Micol

7. Factors that may influence the accuracy of abundance estimates from CCAMLR tag-recapture programs for Dissostichus spp. and best practice for addressing bias

   features in common with the simplest form of an abundance estimator, known as the Lincoln- Petersen ... with respect to M, R and C. Where these assumptions are not met, parameter estimates may be biased ... the true N by the estimate N̂ (i.e. N̂ N> or N̂ N< ), with potential consequences for any ... management advice based on these estimates. To assist with assessing the impact of bias in estimating ...

   Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 63–72 : Auteur(s): Welsford, D.C. and P.E. Ziegler

8. The Patagonian toothfish (Dissostichus eleginoides) fishery in the Kerguelen Islands (Indian Ocean sector of the Southern Ocean)

   eleginoides) have been fished in the Kerguelen Islands zone for 20 years, firstly with trawlers and more ... recently with longliners. This is the oldest fishery targeting D. eleginoides in the Indian Ocean sector of ... the Kerguelen Islands zone for 20 years, firstly with trawlers and more recently with longliners ... maturity stages during the year was studied to determine the spawning period. Mature animals (stages 3 to ... ratio decreases with the years, which shows that the average size of the fish caught is smaller ... occur later in the year, aggregate on the slope of a bank beyond the shelf (Shag Rocks bank) also in ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 1–25 : Auteur(s): Lord, C., G. Duhamel and P. Pruvost

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

   is less than, or equal to, the precautionary assessment with some given level of confidence (for ... estimating the level of illegal fi shing Figure 3: Ten illegal fi shing cruises with different levels of ... precautionary assessment with some given level of confi dence (for example 80%). Résumé Le présent document ... modelling framework of this paper, particularly with regard to the behaviour of vessels when detected ... observation of illegal fi shing effort coupled with the pattern of fi shery patrols is the main input data ...

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

10. Prey monitoring surveys: a discussion of the characteristics necessary in prey surveys

    with the total prey available as a significant amount, perhaps even all of the prey may be beyond ... these are listed in Table 1 along with comments regarding the implied requirements for prey surveys ... . Three of the parameters (foraging trip - 379 - duration, chick fledging weight and chick diet ... ) and breeding success, are therefore not suitable for comparison for interpretative purposes with ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 377-391 : Auteur(s): Everson, I.

Pages