Résultats de la recherche

1. New data on spawning, hatching and growth of Champsocephalus gunnari on the shelf of the Kerguelen Islands

   the inner shelf has enabled a new cohort of fish to be identified each year. However, annual ... outer shelf. The three-year cycle observed previously seems to be related to the maturation stage of ... Paper Title:  New data on spawning, hatching and growth of Champsocephalus gunnari on the shelf of ... the Kerguelen Islands Abstract / Description:  Combined studies on the inner and outer northeastern ... - - - ' , ' i " " " ' " " " ' I " " 0 10 20 30 Total length (cm) Figure 2: Quarterly LFDs for C. gunnari ... taken both by bottom trawl (30' duration; 12 to 20 stations, depending on weather and bottom ... for successive cohorts (Table 3). Daily growth increments are available for the first two years of ... grow more than 10 cm a year during the two first years, after which minimum values are observed ...

   Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 21–34 : Auteur(s): Duhamel, G

2. Note on estimating krill abundance from acoustic data on individual aggregations

   differences of the two approaches are highlighted. It is concluded that the echo-integration approach is ... superior for the estimation of regional krill abundance and its variance since it is easier to apply ... Paper Title:  Note on estimating krill abundance from acoustic data on individual aggregations ... . An estimator is available for randomly distributed aggregations (Lucas and Seber, 1977), but in ... WG-KRILL-91/20 NOTE ON ESTIMATING KRILL ABUNDANCE FROM ... for each ESDU is not available, but there is information on the mean intensity of echoes returned by ... little sense in collecting acoustic data on individual aggregations, although naturally, for studies on ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 219–223 : Auteur(s): Hampton, I. and D.G.M. Miller

3. Modelling catch and effort data using generalised linear models, the Tweedie distribution, random vessel effects and random stratum-by-year effects

   . Further, the inclusion of an area stratum by fishing year interaction as an additional random effect in ... distribution, random vessel effects and random stratum-by-year effects Abstract / Description:  The current ... standard method for modelling catch and effort data for Patagonian toothfish (Dissostichus eleginoides) for ... standardised CPUE estimates and their precision can be obtained from the ‘fishing year’ parameter estimates ... log-linear any chosen ref- erence level for an additive factor included in η’ other than YEAR simply ... 20 30 40 50 -0 .6 -0 .4 -0 .2 0. 0 0. 2 0. 4 0. 6 Ship index R an do n ef fe ct e st ... the infl uence on the series of the random-effects estimates for stratum- by-year is small (i.e. the ... and an anonymous referee for their helpful comments on the manuscript. References Brandão, A., D.S ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 59–80 : Auteur(s): Candy, S.G

4. A stock assessment model of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea Region incorporating multi-year mark-recapture data

   Sea Region incorporating multi-year mark-recapture data Abstract / Description:  An exploratory ... , and tagging has been an ongoing requirement for all vessels fishing in the fishery since 2004 ... model was developed for Antarctic toothfish in the Ross Sea region that incorporates multi-year release ... . Although tagging experiments are commonly used for assessing fish stocks, most rely on estimates of ... . _______________________________________________________________ 1 The CCAMLR fishing season starts on 1 December and ends on 30 November in the following year ... the catches calculated for each year between 1999 and 2012 for Antarctic tooth- fish on the shelf ... . Mangel and A.D. MacCall. 2006. A prior for steepness in stock-recruitment relationships, based on an ... (NIWA) Ltd. PO Box 893, Nelson 7040 New Zealand Abstract An exploratory longline fishery for ...

   Science Journal Paper : CCAMLR Science, Volume 21 (CCAMLR Science, Volume 21) : 39–62 : Auteur(s): Mormede, S., A. Dunn and S.M. Hanchet

5. Distribution of fish larvae at South Georgia: horizontal, vertical, and temporal distribution and early life history relevant to monitoring year-class strength and recruitment

   distribution and early life history relevant to monitoring year-class strength and recruitment Abstract ... . The findings are discussed in relation to surveys for sampling the early stages of fish at South ... / Description:  Four studies on the early life history stages of Antarctic fish at South Georgia are reported ... the depths sampled depends on the target species and the time of the year. For example ... significant impact on the year class strength. For Champsocephalus gunnari the period of mid-November to ... island is an important breeding area for higher predators which are also studied by shorebased research ... depth strata. These net hauls were at 250-150, 150-70 and 70-2 m depth, each for 30 minutes duration ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 105-141 : Auteur(s): North, A.W.

6. Erratum and Addendum - Modelling catch and effort data using generalised linear models, the Tweedie distribution, random vessel effects and random stratum-by-year effects – CCAMLR Science, 11: 59–80 (2004)

   models, the Tweedie distribution, random vessel effects and random stratum-by-year effects – CCAMLR ... Erratum For the GLMM the ‘effective degrees of ... ) used to fit the GLMM imple- ments the correct formula for r. Addendum The extended quasi-deviance ... 0. ij ij ij ij I if y I if y Figure 1 gives the profile EQD for the fitted GLMM (equation 8 of ... EffEcts And rAndoM strAtuM-by-yEAr EffEcts CCAMLR Science, 11: 59–80 (2004) S.G. Candy Department ...

   Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 221–222 : Auteur(s): Candy, S.G

7. Alternative methods for determining subarea or local area catch limits for krill in Statistical Area 48

   current fishing patterns; and (vi) the potential for delay in implementing the alternative. An alternative ... for implementation. However, two of the alternatives (i.e., protective zones and critical periods) are ... precautionary catch limit on krill (Euphausia superba) in Statistical Area 48. The measure also implies an ... Paper Title:  Alternative methods for determining subarea or local area catch limits for krill in ... single year. Then, for the following two years, that subarea would be closed to fishing. For example, if ... patterns; and (vi) the potential for delay in implementing the alternative. An alternative is less likely ... available for implementation. However, two of the alternatives (Le., protective zones and critical periods ... not an acceptable, long-term strategy for managing the krill fishery (SC-CAMLR, 1991). Considering ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 237–249 : Auteur(s): Watters, G. and R.P. Hewitt

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

   spatially explicit modelling approaches is also an important next step for Dissostichus spp. assessments ... -recapture programs for Dissostichus spp. and best practice for addressing bias Abstract / Description:  The ... Lincoln-Petersen equation, the simplest form of an abundance estimator using tag-recapture data, was used ... account for their effects in stock assessments for Dissostichus spp. are also summarised. In nearly all ... = ´ . (2) Deriving an accurate value for N using this esti- mator is based on a variety of assumptions ... for depredation on tagged fish that may have occurred, however, we are unaware of such an adjustment ... handled. For example, there are at least two individual toothfish in the Heard Island and McDonald ... ; SC-CAMLR, 2011a, 2011b). In inte- grated assessments for South Georgia and the Ross Sea, an estimate ...

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

9. A preliminary investigation of the possible effects of rhizocephalan parasitism on the management of the crab fishery around South Georgia

   , incorporating two scenarios for the stock-recruit relationship of the host: (i) resilience; and (ii) sensitivity ... strategy for this crab population. The main data requirements for improving on this preliminary study are ... reduce the effective spawning stock biomass, and this clearly has implications for stock management. The ... possible implications of parasitism for management are investigated by considering a population model that ... population (e.g., W ( F = 0, p = 63%), curve a) . Harvesting starts in year 10 on an unexploited ... I would like to thank Dan Hoggarth for valuable comments on an earlier draft of this paper. I also ... -parasite model is constructed, incorporating two scenarios for the stock-recruit relationship of the host ... that an animal is capable of breeding successfully, whereas morphological maturity means that the ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 175–192 : Auteur(s): Basson, M

10. Effects of different harvesting strategies on the mackerel icefish Champsocephalus gunnari around South Georgia

    the mackerel icefish (Champsocephalus gunnari) have been simulated for a period of 30 years. These ... constant levels of fishing mortality to the strength of the incoming year class. An increase of F, however ... 50% F 0.1 with F increasing three or five years after a good recruitment; pulse fishing at an ... partial recruitment. For the projections, recruitment was assumed to follow the historical pattern. Pulse ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 77–100 : Auteur(s): Köster, F.W. and K.-H. Kock

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