Résultats de la recherche

1. Age-structured production model for toothfish at South Georgia

   frequency data achieved last year, but the fit was still poor. The fit to the CPUE was also poor. With ... model. Revisions to the selectivity model this year have led to an ASPM with superior performance ... decaying function of age, with three easily interpretable parameters. When only a single selectivity curve ... reaches preset parameter boundaries. With one or two parameters of the selectivity estimated only once the ...

   Meeting Document : WG-FSA-SAM-05/18 : Auteur(s): A. Payne, G.P. Kirkwood, R. Hillary and D.J. Agnew (United Kingdom)

2. Has climate change promoted genetic fragmentation in the ice-dependent fish Pleuragramma antarcticum?

   and was unable to discriminate between hypotheses of panmixia, with occasional fluctuations of gene ... scale from samples collected off the tip of the AP, with a signal of increased fragmentation over time ... shelf, the increase of population fragmentation with time, and the inability to capture P. antarcticum ... dependent species could be highly vulnerable to climate change with possible cascading effects on the ...

   Meeting Document : WG-FSA-13/67 : Auteur(s): C. Agostini, T. Patarnello (Italy), J. Ashford, J. Torres (USA) and L. Zane (Italy)

3. On the consequences of differentiating between adult and sub-adult survival rates in the krill-predators model

   split of the overall density dependence effect between the first year and following sub-adult years of ... Abstract:  The krill-predators model is generalised by splitting post-first-year animals into ... adults and sub-adults, with different survival rates for these two groups. Broadly speaking, the sub ... . This solution brings with it new problems, however, in that two further parameters need to be specified ...

   Meeting Document : WG-EMM-95/39 : Auteur(s): Butterworth, D.S., Thomson, R.B.

4. Time series of Antarctic krill estimates around the South Shetland Islands from 2013 to 2019

   Subarea 48.1 is submitted with accompanying description of the acoustic survey and data analysis ... data were collected with ship-mounted Simrad EK60 scientific echosounder system. A swarm-based Echoview ... EV template was used for echo-integration, and the areal krill density with coefficient of variance ... increasing trend during the last 6 years, increased from 20.22 g m-2 in December 2013 to 70.13 g m-2 in ...

   Meeting Document : SG-ASAM-2019/04 Rev. 1 : Auteur(s): X. Yu, X. Wang, X. Zhao, J. Zhang, G. Fan, Y. Ying and J. Zhu

5. Vertical migrations of mackerel icefish (Champsocephalus gunnari) on the South Georgia shelf

   of fish feeding activity was also observed at night. Fishing during this period with bottom trawls ... commercial concentrations of C. gunnari in years of high abundance of the species (1982/83, 1983/84 and 1986 ... may be used for clarification of survey techniques used in stock assessment. For a number of years ... observed at night. Fishing during this period with bottom trawls had yielded almost no catches at all. The ... ). With the onset of dusk (17:00 to 19:00 hr) fish begin migrating to the upper layers and the size of ... concentrations when fishing with midwater trawls. Trawls were set at depths where concentration of fish was the ... years of high abundance of the species (1982/83, 1983/84 and 1986/87). Catch-per-hour of fishing was ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 3–14 : Auteur(s): Frolkina, J.A. and V.I. Shlibanov

6. Register of non-CEMP time-series data

   Abstract:  The Secretariat was tasked with maintaining a register of the wide range of non-CEMP ... -XXII, Annex 4, paragraph 2.10). Non-CEMP data of interest are listed in Tables 1-3. Author(s ...

   Meeting Document : WG-EMM-04/9 : Auteur(s): Secretariat

7. SPATIAL PROTECTION AND MANAGEMENT OF ANTARCTIC MARINE BIODIVERSITY

   information is now adequate to make progress, and that practical means to cooperate with the CEP/ATCM are ... full range of tools available under CCAMLR and the ATCM. Cooperate as far as possible with the CEP to ... ensure that such measures are implemented on a scientific basis, and with the aim of achieving harmonised ... Abstract:  This paper is based on a presentation given at the Joint CEP/SC-CAMLR Workshop (3-4 ...

   Meeting Document : WG-EMM-09/09 : Auteur(s): S. Grant (United Kingdom)

8. PROPOSAL FOR AN EXTENSION TO THE MARK–RECAPTURE EXPERIMENT TO ESTIMATE TOOTHFISH POPULATION SIZE IN THE SOUTH OF SUBAREA 48.4

   Abstract:  1. A three-year tagging study in the South of Subarea 48.4 was initiated in the 2008/09 ... fishing season with the aims of providing the data required for assessments of the population structure ... with discard weights at 19% and 0.8% of toothfish catches, respectively. These rates are similar to ... experiment in the South of Subarea 48.4 in 2009/10 with a combined catch limit of 75 tonnes for Dissostichus ...

   Meeting Document : WG-FSA-09/18 : Auteur(s): J. Roberts and D.J. Agnew (United Kingdom)

9. DISTRIBUTION OF KRILL AT THRESHOLD DENSITIES SUITABLE FOR FISHING IN THE ATLANTIC SECTOR: ANALYSIS OF THE 2000 SYNOPTIC SURVEY DATA

   shelf SSMUs in terms of the frequency of 1nm integration units with krill densities above and below a ... . This was also true with other threshold values in the range 25 to 200 gm2 although the difference was ... with those that affect the behaviour and performance of the fishery. Author(s):  S. Hill and D. Agnew ... integration units where the threshold density for fishing was set at 100 gm2 following Kasatkina (2003). 3 ...

   Meeting Document : WG-EMM-08/16 : Auteur(s): S. Hill and D. Agnew (United Kingdom)

10. OTOLITH CHEMISTRY REFLECTS FRONTAL SYSTEMS IN THE ANTARCTIC CIRCUMPOLAR CURRENT

    Bank; 2) Mn/Ca enrichment associated with South America; 3) Sr/Ca linked to the presence of Circumpolar ... eddies may account for affinities with neighbouring sampling areas, bringing water from the Subantarctic ... with depth and improved cross-validation by 14%, giving 85% classification rates to South American and ...

    Meeting Document : WG-FSA-08/P04 - Abstract : Auteur(s): J.R. Ashford, A.I. Arkhipkin and C.M. Jones

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