Résultats de la recherche

1. Proposal for an extension to the mark-recapture experiment to estimate toothfish population size in the South of Subarea 48.4

   Abstract:  A three‐year tagging study in the South of Subarea 48.4 was initiated in the 2008/09 ... 48.4; A total of 186 D. eleginoides and 202 D. mawsoni were tagged and released in 2010, leaving a ... total of 794 tagged fish in the water, respectively. A total of 13 D. eleginoides and 22 D. mawsoni were ... and rajids again dominated bycatch, comprising 15.4% and 1.2% of toothfish catch, respectively. A ...

   Meeting Document : WG-FSA-10/40 : Auteur(s): J. Roberts and D. Agnew (UK)

2. Estimating the biodiversity of the sub-Antarctic Indian part for ecoregionalisation: Part I. Pelagic realm of CCAMLR areas 58.5.1 and 58.6

   methodology: (1) a taxonomic approach based on communities only, (2) a physiognomic approach used for the ... bioregionalisation of the Southern Ocean based on abiotic and chlorophyll- a characteristics of the habitat only, and ... (3) a mixed approach, we called “ecoregionalisation”, which includes taxonomic, ecological and ... physiognomic data.  The mixed approach is a relatively new method and is demonstrated on mesopelagic fish here ...

   Meeting Document : WS-MPA-11/10 : Auteur(s): P. Koubbi (France), P.A. Hulley (South Africa), B. Raymond (Australia), F. Penot, S. Gasparini, J.P. Labat, P. Pruvost (France), S. Mormède (New Zealand), J.O. Irisson, G. Duhamel and P. Mayzaud (France)

3. UPDATE OF THE INTEGRATED STOCK ASSESSMENT FOR THE PATAGONIAN TOOTHFISH (DISSOSTICHUS ELEGINOIDES) FOR THE HEARD AND MCDONALD ISLANDS USING CATCH-AT-AGE DATA AND TWO YEARS OF SURVEY ABUNDANCE-AT-AGE DATA

   -length proportions were retained but for a given fishery the same age-specific selectivity function and ... . Effective sample sizes for the commercial catch-at-age proportions, assuming a multinomial distribution, and ... the coefficient of variation (CV) for the abundance-at-age, assuming a lognormal distribution, each ... ageing error. CASAL allows a single ageing error matrix to be defined and applies this matrix to ...

   Meeting Document : WG-SAM-09/09 : Auteur(s): S.G. Candy (Australia)

4. INVESTIGATING LENGTH AT MATURITY OF ANTARCTIC TOOTHFISH (DISSOSTICHUS MAWSONI) BASED ON SCIENTIFIC OBSERVERS’ DATA

   observers’ staging data were highlighted and GSI is recommended as a better indicator of maturity status in ... Antarctic toothfish. Reports of histological analyses of a small number of Antarctic toothfish showed ... a limited number of fish, most of which were from the southern area, therefore not on obviously ... spawning fish. Histological analysis using a hindcasting assessment of 683 samples collected in December to ...

   Meeting Document : WG-FSA-08/48 : Auteur(s): S. Mormede, S. Parker and P. Grimes (New Zealand)

5. Mincing, mealing and batching: waste management strategies aimed at reducing seabird interactions with trawl vessels

   to a paste before it was discharged reduced the number of seabirds around the vessels. The first ... trial was on a mid-water trawler targeting hoki (Macruronus novaezelandiae), and the experiment on this ... (Nototodarus sloanii). There was no meal plant on board and the mealed treatment was replaced with a batching ... was determined by counting the number of birds within a 40m-radius semi-circular sweep zone behind the ...

   Meeting Document : WG-FSA-07/42 : Auteur(s): E. Abraham and J. Pierre (New Zealand)

6. Mackerel icefish Champsocephalus gunnari in the diet of upper trophic level predators at South Georgia: implications for fisheries management

   important prey species for a number of upper trophic level predators, and is the target of commercial ... % of the diet by mass of gentoo penguins. The length-frequency distributions of C. gunnari indicated a ... 1993, 1996, 1999 and 2001. A recruitment index based on the contribution by mass of the 1+ age-class in ... the diet of gentoo penguins indicated a higher degree of variability in recruitment than in considered ...

   Meeting Document : WG-FSA-03/74 : Auteur(s): K. Reid, S. Hill and T. Diniz (United Kingdom)

7. LENGTH AND AGE AT SPAWNING OF ANTARCTIC TOOTHFISH DISSOSTICHUS MAWSONI IN THE ROSS SEA

   Abstract:  This study uses a histological assessment of age and length at spawning for female and ... spawn in a given year and is therefore appropriate to evaluate spawning stock biomass relative to stock ... management decision rules. A characterisation of the oocyte developmental cycle of Antarctic toothfish shows ... cortical alveoli stage at least a year prior to spawning. Individual oocytes are then recruited into the ...

   Meeting Document : WG-FSA-09/37 : Auteur(s): S.J. Parker and P.J. Grimes (New Zealand)

8. INCORPORATING SAMPLING VARIATION AND RANDOM READER ERROR INTO CALCULATION OF EFFECTIVE SAMPLE SIZE IN THE APPLICATION OF AGE LENGTH KEYS TO ESTIMATION OF CATCH-AT-AGE PROPORTIONS

   observations that contribute to the objective function via a multinomial likelihood. The multinomial likelihood ... requires a nominal sample size for each fishery and year combination. A method is described for estimating ... Monte Carlo multinomial replicates of the observed age length key (ALK) with each ALK used to generate a ... replicate age frequency sample. For each replicate a random draw of the ageing error matrix is taken and ...

   Meeting Document : WG-SAM-09/08 : Auteur(s): S.G. Candy (Australia)

9. Development of methods for evaluating the management of benthic impacts from longline fishing using spatially explicit production models, including model validation

   vulnerable marine ecosystems (VMEs). We describe a spatially explicit production model that can be used to ... investigate a range of scenarios for simulating the effect and management of benthic impacts from longline ... fishing effort. Further, we update this paper with a set of simulations using a range of simple and ... carried out under a range of productivity assumptions, impact, and spatial scale, with and without ...

   Meeting Document : WG-FSA-10/29 : Auteur(s): A. Dunn, S.J. Parker and S. Mormede (New Zealand)

10. Bridging the krill divide: understanding cross-sector objectives for krill fishing and conservation

    Abstract:  In June 2014, the ICED programme, the British Antarctic Survey and WWF co-hosted a two ... . This included shared commitment to maintaining a healthy ecosystem and support for management of the ... agreed that current levels of fishing have a low risk of significant impacts but that there is no need to ... increase catch limits.  Participants also agreed that the objectives of management must include a healthy ...

    Meeting Document : SC-CAMLR-XXXIII/BG/34 : Auteur(s): United Kingdom, Norway, Chile, ASOC and ARK

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