Résultats de la recherche

1. Coastal weather drives foraging behaviour of chinstrap penguins, Pygoscelis antarctica

   coastal downwelling and changes in the at-sea habitat usage of chinstrap penguins (Pygoscelis antarctica ... indicators because their performance is presumed to be linked to the overall function of the ecosystem that ... supports them. In the southwest Atlantic sector of the Southern Ocean, Antarctic krill (Euphausia superba ... indices of krill predators have been proposed as a proxy for krill abundance.  However, there are several ...

   Meeting Document : WG-EMM-18/P14 : Auteur(s): A.D. Lowther, P. Trathan, A. Tarroux, C. Lydersen and K.M. Kovacs

2. Age and growth of Scotia Sea icefish Chaenocephalus aceratus (Lönnberg, 1906), from the South Shetland Islands

   Abstract:  Samples of Chaenocephalus aceratus were collected during a trawl survey carried out ... observed in other recent surveys within the same area, C. aceratus represented one of the predominant ... along their sagittal plane. To estimate the precision of age data, we compared blind readings by readers ... Bertalanffy growth curves were fitted to the estimated age-length data for each sex. The estimated values of ...

   Meeting Document : WG-FSA-02/77 : Auteur(s): M. La Mesa, J. Ashford, E. Larson and M. Vacchi

3. Demersal longlines with integrated weight: a preliminary assessment of sink rates, fish catch success and operational effects

   at 0.3 m/s to 15 m depth. Sink rates can be achieved by adding external weights to lines or by using ... lines with weigh integrated into the rope fibres. The sink rates to 15 m depth of 9 mm demersal ... 0.353 m/s, respectively. The longline with externally attached weights sank at 0.32 m/s. IW longlines ... . Catch rates of ling varied with line weight but results are indeterminant due to the small sample sizes ...

   Meeting Document : WG-FSA-02/22 : Auteur(s): G. Robertson (Australia), M. McNeill, B. King (New Zealand) and R. Kristensen (Norway)

4. Preliminary assessment of Champsocephalus gunnari on the Heard Island Plateau (Division 58.5.2) based on a survey in May 2002

   assessments. The estimate of biomass of mackerel icefish for the population at Heard Island was not ... current estimates of length at age parameters would be for most of the fish to be three year olds. However ... Abstract:  A survey of mackerel icefish, Champsocephalus gunnari, was undertaken in Division ... 58.5.2 in the vicinity of Heard Island in May 2002 to provide the information for an assessment of yield ...

   Meeting Document : WG-FSA-02/47 : Auteur(s): A.J. Constable, R. Williams and T. Lamb (Australia)

5. Preliminary analysis of seabird by-catch using CCAMLR observer data

   data precluded analysis of seabirds at a taxon level more detailed than albatrosses and petrels ... Dissostichus eleginoides and various factors, including the nature and use of mitigating measures as well as ... environmental variables such as time of day, time of year. Out of 3283 longline sets analysed only 311 caught ... distribution of non-zero values) and were analysed using two Generalised Linear Models, a binomial model for ...

   Meeting Document : WG-FSA-99/28 : Auteur(s): D.J. Agnew and J.P. Croxall (United Kingdom)

6. Net-based verification of acoustic techniques used to identify Antarctic krill

   between acoustic backscatter at and 38 kHz (SV120-3B) and at 200 and 120 kHz (Sv200-120) were calculated ... . Using the SDWBA model, dB difference identification ranges based on the length-frequencies of krill in ... of 2-16 dB and (iv) '2 freq 2-12'-with an Sv120-38 range of 2-12 dB The '3 freq model ... identified only 6 of the 16 krill aggregations sampled the nets. contrast the '2 freq model' and ...

   Meeting Document : SG-ASAM-09/04 : Auteur(s): J. Watkins and S. Fielding (United Kingdom)

7. An assessment of seabird interactions with longlining operations for Dissostichus eleginoides around South Georgia, March–May 1997

   interactions with seabirds, and the effectiveness of measures employed to mitigate seabird mortality. In this ... study 61 lines were laid during April and May, all set at night using the Spanish double-line method ... setting operations and all but one during April, giving an average mortality rate of 0.018 birds/1000 ... hooks, and 0.099 birds/1000 observed hooks. Mortalities consisted of nine white-chinned petrels, two ...

   Meeting Document : WG-FSA-97/09 : Auteur(s): Ashford, J.R., Croxall, J.P.

8. A characterisation of the toothfish fishery in Subareas 88.1 and 88.2 from 1997/98 to 2011/12

   last 2–3 years. This appears to be at least partly a result of vessels carrying out more fishing in ... structure or abundance of Antarctic toothfish at the regional (Subarea) or local (SSRU) level. We also ... Subarea 88.1 and for 10 years in Subarea 88.2. This report summarises the timing, depth, and location of ... fishing together with the catch of Dissostichus spp. and bycatch species by year for the period 1997–98 to ...

   Meeting Document : WG-FSA-12/42 : Auteur(s): M.L. Stevenson ,S.M. Hanchet, S. Mormede and A. Dunn (New Zealand)

9. By-catch of juvenile Antarctic fish from krill (Euphausia superba Dana) fisheries in the South Georgia area, in 1992

   . The mean daily length increase in N.larseni is estimated at 0.09 mm. Juveniles of Euphausia superba ... krill fishing by the BAT GrigOly Kovtun in the region of the South Georgia Islands during the period May ... larseni. The frequency of occurrence of juvenile fish was 18.2% when considering all krill tows and 45.5 ... % when only tows made in shelf waters were considered. Juvenile fish abundance, normalised to 1 t of ...

   Meeting Document : WG-FSA-93/8 Rev. 1 : Auteur(s): E.A. Pakhomov and S.A. Pankratov (Ukraine)

10. Interaction of sperm whales with bottom longline and the Mammal and Bird Excluding Device (MBED) operation in the Patagonian toothfish (Dissostichus eleginoides) fishery in the southwestern Atlantic

    in the southern zone (latitude 50º 00’ S) at an average depth of-1282 m. 57.2% of the total number of ... two different fishing zones at 40º and 50º latitudes in the Southwestern Atlantic from March to May ... hauls were observed. Onboard observers recorded: a) quantity and quality of fish parts remaining in the ... recovered longline; b) presence and number of sperm whales and c) comparative fishing yields with and ...

    Meeting Document : WG-FSA-07/23 : Auteur(s): O. Pin and E. Rojas (Uruguay)

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