Résultats de la recherche

1. Estimating confidence intervals for fish stock abundance estimates from trawl surveys

   estimates of abundance obtained from trawl surveys conducted by means of the swept area method, using ... likelihood ratios from Aitchison's delta distribution. Simulation tests of the method show that unbiased ... estimates of density and biomass can be obtained and that the estimated confidence intervals have close to ... the nominal coverage probability. Performance deteriorates in cases where few of the hauls contain ... followed in the method developed here. The delta distribution consists of a discrete probability at the ... distribution with one degree of freedom, at the a probability level. An asymptotic confidence interval for ... vectors of biomasses b ,... bk at the roots of function ( 1 3 ) are regarded as nuisance parameters ... calculating asymptotic confidence intervals for estimates of abundance obtained from trawl surveys conducted ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 203–207 : Auteur(s): de la Mare, W.K

2. Fishery Report 2017: Exploratory fishery for Dissostichus mawsoni in Division 58.4.1

   58.4.1. Reported catches 5. Reported catches of D. mawsoni in Division 58.4.1 peaked at 634 tonnes ... limits are also set so that they provide reasonable certainty that exploitation rates at the scale of ... release Dissostichus spp. at a rate of 5 fish per tonne of green weight caught (Table 2). The tag-overlap ... vessel must move at least 5 n miles away for a period of at least five days. 23. If the catch of ...

   Document : Site Section: Publications

3. Fishery Report 2018: Exploratory fishery for Dissostichus mawsoni in Division 58.4.1

   fishing in 2019. Reported catches 5. Reported catches of D. mawsoni in Division 58.4.1 peaked at 634 ... tag and release Dissostichus spp. at a rate of 5 fish per tonne of green weight caught (Table 2). The ... or set, then the fishing vessel must move at least 5 n miles away for a period of at least five days ... fisheries at small-scale research units (SSRUs), including research blocks within those small-scale ...

   Document : Site Section: Publications

4. Conservation Measure Conservation Measure 41-05 (2019)

   and Annex 41-01/C respectively. 11. Toothfish shall be tagged at a rate of at least five fish per ... night setting, setting of lines should be completed at least three hours before sunrise (to reduce loss ... purpose of this fishery, the area open to fishing is defined by the research block in Annex 41-05/A ... . Catch limit 3. The total catch of Dissostichus mawsoni in Statistical Division 58.4.2 in the 2019/20 ...

   Conservation Measure : 41-05 (2019)

5. CCAMLR ecosystem monitoring and a feedback management procedure for krill

   attributable to loss of prey through fishing activities. The principal fishery in the CCAMLR Convention Area is ... 1.5 million tonnes in the Atlantic Sector of the CCAMLR Convention Area at the Tenth Meeting of the ... kriU at the specified level cause the health of predator populations to decline below an acceptable ... or of the community at large. While some attempts have been made to describe positive and negative ... aspects of change in predator populations and communities (e.g., Croxall et al., 1988) and the scale at ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 345–350 : Auteur(s): Constable, A.J.

6. A rationale for conservation areas within Antarctic waters

   :  The application of potential conservation measures listed in Article IX 2 of the Convention requires ... ‘the designation of regions and sub-regions based on the distribution of populations of Antarctic ... , first priority has been given to surface circulation of southern waters and the distribution of krill ... . This has been supplemented by (limited) information on the distribution of major consumers including ... , contains a unit stock of at least the target species, or preferably, a largely self-contained ecosystem ... circulation, he suggested at least six cyclonic systems, although the longitudinal limits of each were not ... based on knowledge available at the time, of the distribution of the larger baleen whales during the ... ), while sei and minke whales were little segregated at all. For a re-examination of the distribution ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 513-535 : Auteur(s): Chittleborough, R.G.

7. Conservation Measure Conservation Measure 22-06 (2019)

   Secretariat. Review 15. This conservation measure will be reviewed at the next regular meeting of the ... methods of deployment aimed at preventing or reducing significant impacts on VMEs during the course of ... CCAMLR precautionary and ecosystem approaches to fisheries management by embracing principles of ... conservation as stated in Article II of the Convention, Conscious of the urgent need to protect vulnerable ...

   Conservation Measure : 22-06 (2019)

8. Low genetic diversity in the Antarctic toothfish (Dissostichus mawsoni) observed with mitochondrial and intron DNA markers

   digests of nine sub-regions of the mitochondrial genome. Polymorphisms were found in four of seven introns ... areas. Direct sequencing of cytochrome b (665 bp) and the left domain of the control region (639 bp ... from 200–500 mg of muscle tissue by homogenisation and digestion with proteinase-K at 55°C for 4 h ... air dried and resuspended in 40 µl sterile water and stored at –20°C. Two classes of markers, mtDNA ... Rousset, 1995). There was no signifi cant heterogeneity at any of the loci (CK6 χ2 = 2.36, P = 0.31; CK7 ... ) OBSERVED WITH MITOCHONDRIAL AND INTRON DNA MARKERS P.J. Smith National Institute of Water and ...

   Science Journal Paper : CCAMLR Science, Volume 12 (CCAMLR Science, Volume 12) : 43–51 : Auteur(s): Smith, P.J. and P.M. Gaffney

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

   CCAMLR areas is to model the haul-by-haul ratios of catch to effort as the response variable in a ... generalised linear model (GLM) with a square-root link function and a unit variance function. A time series of ... ) estimated using a profile extended quasi-likelihood, and a log link function with log of effort as an offset ... model (GLMM), in order to provide more efficient estimates of the standardised CPUE time series and more ... -count variable with mean τ (e.g. the number of fi sh in the haul). Since N can be zero at a frequency ... determined by the Poisson distribu- tion with mean τ, the distribution of Z has non-zero mass at Z = 0. The ... . Butterworth, B.P. Watkins and D.G.M. Miller. 2002. A fi rst attempt at an assess- ment of the Patagonian ... eleginoides) for CCAMLR areas is to model the haul-by-haul ratios of catch to effort as the response variable ...

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

10. Response to Everson (2008)

    before applying the dB difference technique to identify krill. At a nominal survey speed of 10 knots ... Estimating standing stock of krill using maximum Entropy imagE rEconstruction A.S. Brierley and B.G ... . Heywood Pelagic Ecology Research Group Gatty Marine Laboratory University of St Andrews, Scotland, UK ... Email – asb4@st-and.ac.uk S.F. Gull Astrophysics Group Cavendish Laboratory University of Cambridge ...

    Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 195–198 : Auteur(s): Brierley, A.S., B.G. Heywood and S.F. Gull

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