Résultats de la recherche

1. Variations in echosounder calibration with temperature, and some possible implications for acoustic surveys of krill biomass

   were taken of the differences in gain settings, then integrated 120 kHz echo signals would be under ... biomass by acoustic techniques is dependent on a number of factors of which one of the most fundamental is ... those applied in the Antarctic, even after adjustments have been made to account for differences in ... -reported by 2.8 dB, leading in turn to an under-estimation of krill biomass by 52.5%. Every effort should ... employed during surveys around South Georgia, and no account were taken of the differences in gain ... surveys are conducted. In addition, the implications for biomass estimation of temperature variation ... gain applied by system electronics in some echosounders (Simmonds, 1990), the possible effects of ... temperature, and suggested that many of the transducers then used in fishery acoustics would not be stable ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 273–281 : Auteur(s): Brierley, A.S., C. Goss, J.L. Watkins and P. Woodroffe

2. A study of Patagonian toothfish (Dissostichus eleginoides) post-tagging survivorship in Subarea 48.3

   , fish with a variety of injuries were selected to see if this affected recovery. In the final analysis ... in Subarea 48.3 Abstract / Description:  During the 2005 fishing season, experiments on the ... survivorship of toothfish following tagging were carried out on eight different vessels fishing in Subarea 48.3 ... , 396 animals were included, with an overall survivorship of 90%. Smaller animals and animals in better ... both the Ross Sea and South Georgia are now based in part on the analysis of mark–recapture data (SC ... approaches may be adopted in the different areas. Knowledge of post-tagging survival is extremely important ... survivorship have been made using a combination of on-board tank experiments and the difference in mark ... survivorship of toothfish tagged by observers. Methodology In the 2005 fishing season all vessels fishing ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 279–289 : Auteur(s): Agnew, D.J., J. Moir Clark, P.A. McCarthy, M. Unwin, M. Ward, L. Jones, G. Breedt, S. Du Plessis, J. Van Heerdon and G. Moreno

3. Preliminary results of a bottom trawl survey around Elephant Island in October and December 1987

   proportion of larger (= older) fish in the catches increased. Composition of the catches of C. gunnari ... Paper Title:  Preliminary results of a bottom trawl survey around Elephant Island in October and ... Chaenocephalus aceratus, Notothenia gibberifrons and N. neglecta at least since February 1985. In N. rossii the ... other shelf areas of the Peninsula region. File:  09-Kock.pdf ... and N. neg/ecta at least since February 1985. In N. rossii the proportion of larger (= older) fish in ... the catches increased. Composition of the catches of C. gunnari differed significantly from that in ... described by Kock (1986) and Nast et al. (1988). Results of the most recent survey in October and December ... in Figure 1. The shallow water area southwest of Endurance Glacier was sampled by the launch ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 185-200 : Auteur(s): Kock, K.-H.

4. Areas of seabed within selected depth ranges in CCAMLR Subarea 48.3, South Georgia

   Paper Title:  Areas of seabed within selected depth ranges in CCAMLR Subarea 48.3, South Georgia ... Abstract / Description:  Areas of seabed within 50 m depth contours down to 250 m, between 250 and 500 m ... and deeper than 500 m have been estimated from nautical charts. The results are presented by CCAMLR ... . INTRODUCTION During the 1989 Meeting of the Working Group on Fish Stock Assessment in Hobart, it was agreed ... has been designated by '(S)' in the longitude (W) column of the tables. 3. RESULTS Areas of ... within selected depth ranges in the south-west Atlantic and Antarctic Peninsula regions of the Southern ... RANGES IN CCAMLR SUBAREA 48.3, SOUTH GEORGIA 1. Everson and S. Campbell* Abstract Areas of seabed ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 459–466 : Auteur(s): Everson, I. and S. Campbell

5. A rationale for conservation areas within Antarctic waters

   :  The application of potential conservation measures listed in Article IX 2 of the Convention requires ... ‘the designation of regions and sub-regions based on the distribution of populations of Antarctic ... , first priority has been given to surface circulation of southern waters and the distribution of krill ... . This has been supplemented by (limited) information on the distribution of major consumers including ... potential conservation measures listed in Article IX 2 of the Convention requires "the designation of ... critical step in this is the selection of boundaries for conservation areas in a manner which ensures ... of food in the usual feeding grounds. Seals: The Convention for the Conservation of Antarctic ... designated have marine waters as main components. Ma{ine ecosystems are included in the classification of ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 513-535 : Auteur(s): Chittleborough, R.G.

6. Refinements to the strategy for managing depleted fish stocks based on CCAMLR objectives

   decades is illustrated. These fishing mortalities are based on probabilistic descriptions of the future ... states of a depleted stock, and take into account uncertainty in assessments. Sample calculations show ... that applying a policy of F 0.1 will not always lead to stock recovery in two to three decades, and ... hence that additional management policies are required for depleted stocks. The implications of these ... ". 1. IN1RODUCTION In 1988 the Working Group for the Development of Approaches to Conservation (WG ... ). The studies in this paper explore an approach to calculating values of fishing mortality (F) which ... are more appropriate than F 0.1 in terms of the requirements of Article II of the Convention, for ... considered in formulating operational definitions of depleted and target levels for recovery. 468 The ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 467–475 : Auteur(s): de la Mare, W.K. and A. Constable

7. Seabird interactions with longlining operations for Dissostichus eleginoides at the South Sandwich Islands and South Georgia

   involving the setting and hauling of longlines to catch the toothfish Dissostichus eleginoides around the ... of birds are clearly potentially vulnerable to setting operations in daylight hours. Several species ... of the seabirds present presumably originated from South Georgia populations; however wandering and ... vulnerability to longlining operations in the South Sandwich Islands may, therefore, be low. Quantitative data ... Conservation Measure 29/X (Minimisation of the Incidental Mortality of Seabirds in the Course of Longline ... . The position of sites (Ll to L7Fis shown in Figure 2. Table 2: Mean number of seabirds associated ... conservation. In: Croxall, J.P., P.G.H. Evans and R.W. Schreiber, (Eds). Status and Conservation of the ... . The seabirds of the French sub-Antarctic islands and Adklie Land, their status and conservation. In ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 143–153 : Auteur(s): Ashford, J.R., J.P. Croxall, P.S. Rubilar and C.A. Moreno

8. Management and assessment options for the crab fishery around South Georgia

   . The fishery is also new to CCAMLR, both in terms of the species and fishing gear. We provide an ... overview of the management options for crab fisheries in general and then consider these options in the ... in addition to the 'size-sex-season' controls. Implementation of both sets of controls ... design. One of the main aims in designing a management plan is to allow the fishery to develop at a rate ... spinosissima, started in Subarea 48.3 in 1992. The fishery is also new to CCAMLR, both in terms of the species ... and fishing gear. We provide an overview of the management options for crab fisheries in general and ... then consider these options in the context of this crab fishery with specific reference to the ... catch/effort controls in addition to the 'size-sex-season' controls. Implementation of both sets of ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 193–202 : Auteur(s): Basson, M. and D.D. Hoggarth

9. Some thoughts on precautionary measures for the krill fishery

   :  The concept of precautionary measures for krill is discussed. A precautionary catch limit, based on ... precautionary catch limit in large areas, such as Statistical Area 48, but the approach requires considerable ... takes account of the requirements of land-based predators. Implementation of the approach is discussed ... and the question of how the method relates to the current CCAMLR Ecosystem Monitoring Program (CEMP ... survey at an arbitrary time would be the annual mean value of the biomass in A, which is given by: Thus ... , from (7): The mean value of the biomass in the region A is independent of the growth function for ... . RECENT PROGRESS TOWARDS A PRECAUTIONARY CATCH LIMIT FOR KRILL In the context of CCAMLR considerable ... based on the use of a model that conceptually is relatively simple and is given by the formula: In ...

   Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 1–11 : Auteur(s): Everson, I. and W.K. de la Mare

10. The Kerguelen database

    and biological data for the Kerguelen EEZ has been operating in France since 1979. At the end of the ... representation of these data is presented for several parameters including a distribution of the fishing effort ... , Notothenia squamifrons, N. rossii and Dissostichus eleginoides) represent about 99% of the total catches ... . Length frequency distributions of the species are also provided for the period 1979/80–1985/86. File:  02 ... catches. The presence of N. rossii in the total catches has decreased yearly. Conservation measures ... been operating in France since 1979. At the end of the 1984/85 fishing season, the data from 25445 ... . At the end of the split-year 1985/86 25445, trawlings have been registered in a database. The LFD ... tables. In the interpretation of the results however, one should take into account that the fisheries ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 23-54 : Auteur(s): Duhamel, G.

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