Résultats de la recherche

1. Revised assessment models for Patagonian toothfish in research block C of Division 58.4.4, Ob and Lena Banks

   assessments of Dissostichus eleginoides in research block C in Division 58.4.4 b following the recommendation ... during the latest WG-SAM meeting. The six models with three kinds of assumptions on IUU catch were ... arranged referring to WG-SAM-14/18 as follows: 1) catch at length/age models on the assumption of no IUU ... within the model using disease mortality functionality (Len_2/AgeSing_2 models), 3) catch at length/age ...

   Meeting Document : WG-FSA-14/23 : Auteur(s): K. Taki (Japan)

2. Variability and predictability of Antarctic krill swarm structure

   Abstract:  Swarming is a fundamental part of the life of Euphausia superba, yet we still know very ... little about what drives the considerable variability in swarm shape, size and biomass. We examined ... swarms across the Scotia Sea in January and February 2003 using a Simrad EK60 (38 kHz, 120 kHz ... ) echosounder, concurrent with net sampling. The acoustic data were analysed through applying a swarm ...

   Meeting Document : WG-EMM-10/P10 : Auteur(s): G.A.Tarling, T. Klevjer, S. Fielding, J. Watkins, A. Atkinson, E. Murphy, R. Korb, M. Whitehouse and R. Leaper

3. Ross Sea Bioregionalisation, Part II: Patterns of co-occurrence of mesopredators in an intact polar ocean ecosystem

   Abstract:  We report results of analyses of niche occupation among mesopredators in the Ross Sea ... the surface of the ocean, 2) capacity to utilize differing amounts of the water column (foraging depth ... and Snow petrel. The apex predators, Leopard Seal and Killer Whale ecotype A/B, were not included ... ). Data on depth of diving and diet were taken from the literature. Three patterns of horizontal spatial ...

   Meeting Document : WG-EMM-10/12 : Auteur(s): G. Ballard, D. Jongsomjit and D.G. Ainley (USA)

4. AN ECOSYSTEM-BASED MANAGEMENT PROCEDURE FOR KRILL FISHERIES: A METHOD FOR DETERMINING SPATIALLY-STRUCTURED CATCH LIMITS TO MANAGE RISK OF SIGNIFICANT LOCALISED FISHERIES IMPACTS ON PREDATORS.

   single-species assessment of yield, and a method for implementing the procedure. The decision rule for ... setting catch limits for a given harvest strategy has a straight forward expression of the target ... conditions to be achieved and the uncertainties that need to be managed and does not assume an understanding ... of predator-prey dynamics beyond that evident in the data. It is a natural extension of the current ...

   Meeting Document : WG-SAM-08/16 : Auteur(s): A. Constable and S. Candy (Australia)

5. Uncertainty in acoustic surveys of Antarctic krill

   acoustic surveys. The variance in system calibration with a standard sphere was evaluated in relation to ... bias was investigated by comparing the theoretical and actual target strength (TS) values of four ... different standard spheres with the results of a calibration by self-reciprocity (Demer and Hewitt ... , submitted). Combining the results of these experiments, the accuracy and precision of a system calibration ...

   Meeting Document : WG-EMM-95/72 : Auteur(s): Demer, D.A.

6. An ecosystem-based management procedure for krill fisheries: a method for determining spatially-structured catch limits to manage risk of significant localised fisheries impacts on predators

   single-species assessment of yield, and a method for implementing the procedure.  The decision rule for ... setting catch limits for a given harvest strategy has a straight forward expression of the target ... conditions to be achieved and the uncertainties that need to be managed and does not assume an understanding ... of predator-prey dynamics beyond that evident in the data.  It is a natural extension of the current ...

   Meeting Document : WG-EMM-15/36 : Auteur(s): A. Constable and S. Candy (Australia)

7. Alternative methods for determining subarea or local area catch limits for krill in Statistical Area 48

   limit on krill (Euphausia superba) in Statistical Area 48. The measure also asks the Scientific ... Committee to provide the Commission with advice on how precautionary limits could be applied to subareas or ... evaluated relative to six criteria: 1) the degree to which information on biological relationships is ... considered, 2) the cost of data collection, 3) the reliability of required information, 4) the ease of ...

   Meeting Document : WG-KRILL-92/16 : Auteur(s): G. Watters and R.P. Hewitt (USA)

8. Responding to climate change: Adélie penguins confront astronomical and ocean boundaries

   latitudes for the remainder of the year. The latitudinal range of the Adélie penguin spans ~22o. Penguins ... from northern colonies may not migrate, but due to the high latitude of Ross Island colonies, these ... penguins almost certainly undertake the longest migrations for the species. Previous work has suggested ... Island, Ross Sea, the southernmost colonies for any penguin. We acquired data from 3-16 Geolocation ...

   Meeting Document : WG-EMM-10/P11 : Auteur(s): G. Ballard, V. Toniolo, D.G. Ainley, C.L. Parkinson, K.R. Arrigo and P.N. Trathan

9. Discussion on recent results from an integrated assessment of Antarctic krill (Euphausia superba) in Subarea 48.1

   Abstract:  This is a companion paper to Kinzey et al. (2014), who extended the integrated stock ... were pooled at annual, seasonal, and monthly time scales.  The data were from research cruises ... conducted by Germany (RMT8 net samples from 1981 to 1989), the U.S. AMLR Program (IKMT net samples from 1992 ... from three of the models provide a robust picture of changes in the krill population.  An annual model ...

   Meeting Document : WG-EMM-14/35 : Auteur(s): G.M. Watters, C.S. Reiss and D. Kinzey (USA)

10. Line weights of constant mass (and sink rates) for Spanish-rig Patagonian toothfish longline vessels

    kg weights at 40 m intervals on longlines to minimise interactions with seabirds. The weights are ... collections of rocks enclosed in netting bags. The netting bags abrade on the seabed, rocks are lost and ... chartered Spanish-rig longline vessel to determine the statistical relationship in sink rates of longlines ... equipped with bags of rocks (4 kg, 6 kg and 8 kg) and lines with steel weights of equivalent masses. The ...

    Meeting Document : WG-FSA-07/15 : Auteur(s): G. Robertson (Australia), C.A. Moreno, E. Gutiérrez (Chile), S.G. Candy (Australia), E.F. Melvin (USA) and J.P. Seco Pon (Argentina)

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