Результаты поиска

1. Estimates of length-frequency in the assessment of mackerel icefish Champsocephalus gunnari in Subarea 48.3

   Abstract:  This working document provides details of a modification in the method of calculating ... length distributions used in the assessment of Champsocephalus gunnari from the length distributions of ... individual hauls. The effect of these changes in method have little impact on the catches that would have ... from the 2015 and 2017 surveys.   Author(s):  T. Earl Title:  Estimates of length-frequency in the ...

   Meeting Document : WG-FSA-17/51 : Автор(ы): T. Earl

2. Overview and update of Australia’s scientific tagging program in the Patagonian toothfish (Dissostichus eleginoides) fishery in the vicinity of Heard and McDonald Islands (Division 58.5.2)

   understanding growth rates of toothfish, small and large scale movements, stock structure and local abundance ... . This paper serves as an overview of the tagging dataset, and an update to previous summary papers ... . Tagging effort and recaptures are very concentrated in a relatively small area of this species’ habitat in ... this Division. Furthermore, as toothfish appear to have complex patterns of movement in space and time ...

   Meeting Document : WG-FSA-07/48 Rev. 1 : Автор(ы): D.C. Welsford, T. Lamb and G.B. Nowara (Australia)

3. Preliminary analyses of data collected during experimental fishing for Patagonian toothfish in international waters of the southwest Indian Ocean (Area 51)

   procedures, in a restricted area south of Madagascar and north of the Prince Edward and Marion Islands and ... the Crozet Islands, and outside EEZ and CCAMLR waters. A total of 57 sets were taken at between 360 ... comprised between 53 and 1158 kg. Northward distribution of Patagonian toothfish is closely related to the ... extension of the sub-Antarctic Front to the north. The prospected area would seem to be located at the edge ...

   Meeting Document : WG-FSA-04/19 : Автор(ы): L.J. López Abellán (Spain)

4. An 8-year cycle in krill biomass density inferred from acoustic surveys conducted in the vicinity of the South Shetland Islands during the austral summers of 1991/1992 through 2001/2002

   vicinity of the South Shetland Islands, Antarctica were re-analyzed using updated procedures for ... compensating for diel vertical migration of krill outside of the acoustic observation window. Intra-and inter ... surveys conducted in the austral summers of 1991/1992 through 2001/2002. Estimated biomass density ranged ... variability may be attributed to changes in the spatial distribution of krill relative to the survey area ...

   Meeting Document : WG-EMM-03/6 : Автор(ы): R.P. Hewitt, D.A. Demer and J.H. Emery (USA)

5. Reconciling theoretical versus empirical target strengths of krill; effects of phase variability on the distorted wave Born approximation

   Abstract:  A model was recently proposed to predict the target strengths (TS) of Antarctic krill ... ]. Based on the distorted wave Born approximation (DWBA), the model depends upon the coherent summation of ... scattering from elements of a discretized bent cylinder. It was empirically validated at 120 kHz near ... , the authors noted that the differences were not entirely due to noise. In this study, the accuracy of ...

   Meeting Document : WG-EMM-02/50 : Автор(ы): D.A. Demer and S.G. Conti (USA)

6. Analysis of krill trawling positions in the area north of the South Shetland Islands (Antarctic Peninsula area) from 1980/81 to 1998/99

   Abstract:  Positions of commercial krill operation for 1980/81 season to 1998/99 season in the ... area to the north of South Shetland Islands were analyzed by using GLM (generalized linear model ... ). Fishing season, the timing, and the longitude were significant factors to explain the variability of ... from mid-1980 onwards, they tended to happen in the south, with exceptions of 1994/95 and 1995/96 ...

   Meeting Document : WG-EMM-00/58 : Автор(ы): S. Kawaguchi (Japan)

7. Criteria for aging the otoliths of Dissostichus eleginoides from South Georgia (Subarea 48.3) and an analysis of aging precision

   Abstract:  A prerequisite for validation of an aging technique is a clear set of consistent aging ... criteria to test. Two sets of criteria ate presented for aging the otoliths of Dissostichus eleginoides ... occur at several scales and vary both within and between otoliths. Pairwise comparisons of repeat ... within and between observers, reflecting the complexity of the otolith structure. Aging using criteria C1 ...

   Meeting Document : WG-FSA-98/52 : Автор(ы): J. Ashford (United Kingdom) and S. Wischniowski (Canada)

8. Changes in population size of large Procellariiformes breeding in the French sub-Antarctic islands: potential influence of southern fisheries and particularly long lining

   indicate that these declines are mainly the result of increased adult mortality. This high rate of ... mortality has been suspected to be the result of mortality incurred in long-line fisheries. Satellite ... tracking studies of breeding birds and band recoveries of non breeding birds indicate that during and ... EEZ. The decrease in the fishing effort of the Japanese fishery during the recent years has probably ...

   Meeting Document : WG-IMALF-94/11 : Автор(ы): Henri Weimerskirch and Pierre Jouventin (France)

9. Development of an underwater setting method for surface longliners, to minimise the accidental capture of seabirds

   Abstract:  In response to the Department of Conservation's concerns for the accidental ... capture of seabirds by Surface Long Liners and subsequent contract 9513004, several concepts of bait ... reaches its determined depth. At this point in time the carry over action of the capsule and retrieval ... action would release the bait. This design concept proved worthy of construction and trial. Sea trials of ...

   Meeting Document : WG-FSA-97/54 : Автор(ы): Bentley, N., Smith, M.

10. Results of a hydroacoustic survey of Antarctic krill populations in CCAMLR Division 58.4.1 carried out in January to April 1996

    CCAMLR Division 58.4.1 for the purposes of estimating overall biomass (B0). The krill biomass in the area ... surveyed (873,000 km2) was estimated to be 6.67 million tonnes with a CV of 27%. Krill were more abundant ... in the west of the survey area 800-1200E than in the 120°-150°E region. The majority of the krill ... detected were found in the top 80 metres of the water column. Author(s):  Higginbottom, I., de la Mare, W ...

    Meeting Document : WG-EMM-96/28 : Автор(ы): Higginbottom, I., de la Mare, W., Pauly, T., Nicol, S.

Страницы