Résultats de la recherche
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Acoustic visualization of the three-dimensional prey field of foraging chinstrap penguins
Antarctic krill, a keystone prey species in the Southern Ocean food web. It has been difficult to evaluate ... natural predators. Here, we report a novel method for assessing prey availability to an important krill ... -dimensional distribution of krill within a 1852 X 1852 X 100 m volume of ocean. Our study revealed the ... predict predator responses to a changing food environment. Author(s): J.E. Zamon, C.H. Greene, E. Meir ...
Meeting Document : WG-Joint-94/12 : Auteur(s): J.E. Zamon, C.H. Greene, E. Meir, D.A. Demer, R.P. Hewitt and S. Sexton (USA)
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Alternative assessment methods for toothfish at South Georgia
initially fished quite heavily. The second is that when a decline was seen, it was much more abrupt than ... would be predicted by the model. Thirdly, all models predict a continuing decline, not the increase in ... and a simple M- and tagging mortality adjusted Petersen estimator. This latter analysis suggests ... biomass in 2002 was between 78,000 and 114,000 t. Author(s): Kirkwood, G., Payne, A., Agnew, D. Title ...
Meeting Document : WG-FSA-SAM-04/17 : Auteur(s): Kirkwood, G., Payne, A., Agnew, D.
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Evaluation of VME taxa classification by scientific observers from New Zealand vessels in the Ross Sea Antarctic toothfish longline fishery during the 2009/10 season
areas south of 60°S) to collect and monitor longline bycatch for VME taxa, and implement a move-on rule ... was conducted. Scientific Observers classified invertebrate bycatch using a revised and expanded VME ... samples). In the Echinodermata group, brittle stars (a non-VME taxon) were sometimes recorded as snake ... stars (a VME taxon). Briefings prior to sailing and additional training materials can address most ...
Meeting Document : TASO-10/10 : Auteur(s): D.M. Tracey, M.E. Carter and S.J. Parker (New Zealand)
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Stability of trip selections for the assessment of Antarctic toothfish in the Ross Sea
Abstract: A dataset for the 2009 assessment of Antarctic toothfish (Dissostichus mawsoni) in the ... tags, and/or where tags released on the trip were subsequently recaptured at a high rate. These trips ... were used to define a range for various data quality metrics considered to be informative with respect ... dataset. A retrospective analysis of this data selection method was undertaken to evaluate whether trip ...
Meeting Document : WG-FSA-10/26 : Auteur(s): D.A.J. Middleton (New Zealand)
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Research plan for the Spanish exploratory longline fishery for Dissostichus spp. in Divisions 58.4.1 and 58.4.2: Update of stage 2 (2013/14 season) and preliminary results of stage 1 (2012/13 season) according to WG-SAM advice
Abstract: A revision of the research plan and preliminary results of the Spanish exploratory ... not reach the threshold to start the depletion. A new prospective estimation of the local biomass (B ... densities, with a better fit of the regression and lower residuals than the previous analysis. An ... analysis of relevant sea-ice conditions in the last 11 seasons in these areas along with a summary of the ...
Meeting Document : WG-FSA-13/15 : Auteur(s): R. Sarralde, L.J López Abellán and S. Barreiro (Spain)
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Study on reproductive biology of Champsocephalus gunnari, Chaenocephalus aceratus and Pseudochaenichthys georgianus from South Georgias and Shag Rocks, Dr Eduardo Holmberg survey – May 2013
suggests spawning of P.georgianus and C.aceratus. C. gunnari batch fecundity showed a potential fit to size ... and a lineal fit to weight and ranged from 2,500 (27 cm TL) to 21,300 (54 cm TL) hydrated oocytes ... . Batch fecundity values for P.georgianus and C.aceratus showed a lineal fit to size and weight, they ... dry weight of C.gunnari ’s hydrated oocytes showed a positive relationship with female size. Author(s ...
Meeting Document : WG-FSA-13/59 : Auteur(s): M.I. Militelli, G.J. Macchi and K.A. Rodrigues (Argentina)
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Continuation in the 2015/16 season of the research plan initiated in 2012/13 for stocks of Dissostichus spp. in Divisions 58.4.1 and 58.4.2
Abstract: In the 2012/13 fishing season Spain began implementing a multi-annual Research Plan for ... problems with a blade of the propeller, During the season 2015/16 is intended to make the same proposed ... -season and between-seasons recaptures and a preliminary Age-Length Key of Dissostichus mawsoni has been ... built after otholits reading from 58.4.1 division specimens. All these data will allow a robust stock ...
Meeting Document : WG-SAM-15/02 : Auteur(s): Delegation of Spain
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2019 Ross Sea shelf survey results and notification for research in 2020
2012, with a revised proposal presented in 2017 for five years (2018–2022). The objectives of the ... south of SSRUs 881.J and 881.L in the southern Ross Sea (Strata A–C) using standardised gear in a ... Satellite Archival Transmitters (PSATs) on toothfish throughout the survey area and tested a remote ...
Meeting Document : WG-SAM-2019/03 : Auteur(s): S. Parker and C. Jones
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Stones in toothfish stomachs: an unusual source of geological information from closed regions of Antarctic shelf and slope
Abstract: The rocks from stomachs of Dissostichus mawsoni were used as a source of geological ... respect, Dissostichus mawsoni may be considered as a «dredge» with a wide area of sampling. Preliminary ...
Meeting Document : WG-FSA-07/58 : Auteur(s): N.V. Kokorin, D.S. Klucharev and M.A. Sukhoruchenkov (Russia)
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PRELIMINARY ASSESSMENT OF TOOTHFISH IN SUBAREA 48.3
lognormal recruitment suggest a long-term yield of 3900 t. Using a recent subset of estimated cohorts ... suggests a lower yield. Author(s): D.J. Agnew and T. Peatman (United Kingdom) Title: PRELIMINARY ...
Meeting Document : WG-FSA-09/28 Rev. 1 : Auteur(s): D.J. Agnew and T. Peatman (United Kingdom)