Résultats de la recherche

1. Revised research plan for the 2013/14 exploratory longline fishery of Dissostichus spp. in Division 58.4.1

   observer data. The stock size estimates for research blocks were revised following advice in the last WG ... that the numbers of tag recoveries in the 2016 season shows an approximately 0.3 of coefficient ... variance of biomass estimate from the bootstrapped procedure, under the condition that the exploitation ... rate (sample size / estimated stock size) would not exceed 3.5 %. The tentatively estimated sample ...

   Meeting Document : WG-FSA-13/38 : Auteur(s): Delegation of Japan

2. Medium-term research plan for the Ross Sea toothfish fishery

   -long term is also recognised. The purpose of this paper is to begin the discussion on medium-term ... Abstract:  The aim of this paper is to review the management of the Ross Sea toothfish fishery and ... to identify key research objectives for the fishery over the next 3–5 years in relation to Article II ... of the Convention. The paper focuses primarily on Antarctic toothfish, as catches of Patagonian ...

   Meeting Document : WG-FSA-14/60 : Auteur(s): Delegations of New Zealand, Norway and the United Kingdom

3. Stable isotope analysis reveals trophic variation in adult Antarctic krill (Euphausia superba) around the Antarctic Peninsula from austral fall to early winter

   Abstract:  The Antarctic krill (Euphausia superba) is a key species in the Southern Ocean ... ecosystem and an important link in the food web of the Antarctic ecosystem. The trophic information for this ... species during the transition from the austral fall to the winter is important to understand its poorly ... known overwintering mechanisms. However, the few studies on the topic differ in their results, in terms ...

   Meeting Document : WG-EMM-2019/P03 : Auteur(s): H.T. Zhang, G.P. Zhu, Q. Song, S.Q. Wang, Y. Yang and Q.Y. Yang

4. Results of study of the oogenesis characteristics of Antarctic toothfish (Dissostichus mawsoni Norman 1937) (Nototheniidae) from Subareas 88.1 and 88.2 (Ross Sea)

   Abstract:  The results of the histological analysis of the Antarctic toothfish (Dissostichus ... mawsoni) reproductive system, caught in December-March, 2004-2005 by the longliner VOLNA in subareas 88.1 ... and 88.2 in the Ross Sea are presented. The morphological parameters, indices of gonads have been ... described. The histological criteria of the assessment of the ovary maturity stages and cytological ...

   Meeting Document : WG-FSA-07/49 : Auteur(s): S. V. Piyanova and A.F. Petrov (Russia)

5. A single-area stock assessment model of Antarctic toothfish (Dissostichus mawsoni) in SSRU 88.2E for the 2004/05 season

   model for Antarctic toothfish (Dissostichus mawsoni) in SSRU 88.2E. The model structure was assumed to ... be the same as used for the Antarctic toothfish in the Ross Sea (see Dunn et al. 2005b), except that ... catch removals were modelled as a single fishery. Model fits to the data were adequate, with the tag ... -release and recapture data providing the most information on stock size, but with the catch-at-age data ...

   Meeting Document : WG-FSA-05/31 : Auteur(s): A. Dunn, D.J. Gilbert and S.M. Hanchet (New Zealand)

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

   Abstract:  A new method for estimating illegal fishing effort is put forward. The results from ... this new method are similar to those of the Agnew and Kirkwood (2005) method, and this suggests that ... the current method is adequate under circumstances of low evasion and when good knowledge exists that ... zero observations reflect zero illegal fishing. The new method performs better in the case of zero ...

   Meeting Document : WG-FSA-05/P7 : Auteur(s): Ball, I.

7. EXTRAPOLATING CONTINUOUS PLANKTON RECORDER DATA THROUGH THE SOUTHERN OCEAN USING BOOSTED REGRESSION TREES

   and scale-dependent relationship between species abundance and available environmental data. The ... , called BRT (Boosted Regression Trees), to data on the distribution of Oithona similis, a small cyclopoid ... copepod which is abundant through much of near-surface waters of the Southern Ocean. A large dataset (> ... ;19 000 records) of abundances of O. similis were measured during the SCAR Southern Ocean Continuous ...

   Meeting Document : WG-SAM-08/12 : Auteur(s): M.H. Pinkerton, A.N.H. Smith (New Zealand), B. Raymond, G. Hosie (Australia) and B. Sharp (New Zealand)

8. Revised research plan for the Spanish exploratory longline fishery for Dissostichus spp. in Divisions 58.4.1 and 58.4.2: Fundamentals and procedures (this is a revision of WG-SAM-12/13)

   Abstract:  A revision of the research plan for the Spanish exploratory longline fishery for ... Dissostichus spp in Divisions 58.4.1 and 58.4.2, submitted to the XXXI-WG-SAM, taking into account the ... suggestions made by the Working Group is presented. Two methods to estimate the local biomass of the toothfish ... are proposed, a depletion experiment together with the tag of some specimens using the DeLury model ...

   Meeting Document : WG-FSA-12/69 : Auteur(s): R. Sarralde, L.J López Abellán and S. Barreiro (Spain)

9. Change in environmental conditions of the Southern Ocean observed by satellites and data-assimilating models between 1981 and 2019

   Abstract:  We provide a summary of environmental change in the Southern Ocean over the period of ... satellite observaton (1981 to present). The environmental data we consider are: (1) chlorophyll-a ... ) from the AVHRR series of NOAA satellites (1981–2019); (3) spatial gradient of SST (as an indicator of ... ocean fronts) from the same AVHRR observations; (4) sea ice concentration from microwave satellite ...

   Meeting Document : WG-EMM-2019/39 : Auteur(s): M. Pinkerton

10. Revised input parameters and implications for the Antarctic toothfish (Dissostichus mawsoni) stock assessment in Subareas 88.1 and 88.2

    Abstract:  In this paper, we address a number of aspects of the model inputs and parameters of the ... Antarctic toothfish stock assessment for the Ross Sea fishery. In particular we review catch history, length ... runs that investigate the sensitivity of the 2006 stock assessment to changes in these model inputs and ... parameters. Tree-regression methods were used to investigate the areal structure of the length distribution ...

    Meeting Document : WG-SAM-07/6 : Auteur(s): A. Dunn and S.M. Hanchet (New Zealand)

Pages