Résultats de la recherche

1. A potential feedback approach to ecosystem-based management: Model Predictive Control of the Antarctic krill fishery

   Control (MPC) to achieve objectives for a harvested species, its predators and the fishery, in a ... also useful for assessing the feasibility of candidate management policies or objectives, and ... area‐specific carrying capacity for these two areas, and the influx of the harvested species from the ... process can be controlled through weight- ing. The area‐specific catches for the first year in the ... source of the harvested species for the remaining two areas. The biomass dynamics of the harvested ... should occur in concert with the development of a state estimator mentioned above. An imme- diate ...

   Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 119–137 : Auteur(s): Hill, S.L. and M. Cannon

2. Use of indices of predator status and performance in CCAMLR fishery management

   specific approach is provided, involving an assessment procedure and recommendations for management action ... recommendations for restrictions on the magnitude, timing and location of harvesting are reviewed,taking account ... of likely operational constraints on fisheries. File:  20-Croxall.pdf ... used in the management, by CCAMLR, of commercial fisheries. It reviews reasons why it is important for ... environment, evidence for short-term changes (year-to-year differences or trends over three to five years ... Management Strategies? I believe that there are at least two main reasons for doing this. First, in the ... catch in an area requires regular reporting of catches by all vessels and a system for informing them ... changes. The relative merits and feasibilities of recommendations for restrictions on the magnitude ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 353–365 : Auteur(s): Croxall, J.P.

3. Distribution characteristics of krill aggregations in the fishing ground off Coronation Island in the 1989/90 season

   October 1989 to February 1990. An echo sounder was used to assess the characteristics of krill ... which in turn led to an increase in krill concentration. The biological parameters of krill examined ... . Wind force had no direct or indirect influence on the types of krill aggregations or their density. The ... should be regarded as preliminary since they were based on data from one season only. Distributional ... observation period raised the temperature gradient of the thermocline which improves conditions for ... /green liver 15 - dark-green/green liver 65 20 40 60 1:30 10 19.12.89 - 7.0I.90r. time ... \~. P . • . • . • 20 30 • • t • , "' ... I' 50 t I· ... ··"· ", • . 0 . 01 . . I ... carried out, catchability was calculated on the basis of statistical probability models used for fishing ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 49–73 : Auteur(s): Kasatkina, S.M. and V.I. Latogursky

4. Telemetry monitoring of ecological resources

   of telemetry and location monitoring are discussed. Limitations on weight, communication range and ... . Range for an implanted transmitter is typically 30 percent of the range which would be received from ... observer in an aircraft, ranges are about two to five times greater. Transmitters on larger a~imals ... on birds for short-term applications. Usual life of adhesive attachment on birds is about 30 days ... transmitters weighing approximately two kg and lasting about one year are routinely being deployed on ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 495-511 : Auteur(s): Kuechle, V.B.

5. Krill fishing in the Scotia Sea in relation to bathymetry, including the detailed distribution around South Georgia

   the fishery was restricted in that period to an area on the western edge of the shelf break where ... interannual variability in the distribution of trawls. The data for 1993 were only available from August but ... negligible fishing occurred in the following two seasons. In 1994 the fishery was almost totally based over a ... on fine-scale (0.5 o latitude x 1 o longitude) data show that harvesting in the Scotia Sea has been ... fishing for harvesting to be managed using an ecosystem approach. To this end it would be valuable to ... restricted area of about 30 x 20 km. There were also a few isolated hauls made outside this area. During ... . Murray. 1996. Krill biornass estimates for two survey boxes to the northeast and northwest of South ... the fishery was restricted in that period to an area on the western edge of the shelf break where ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 1–17 : Auteur(s): Murphy, E.J., P.N. Trathan, I. Everson, G. Parkes and F.H.J. Daunt

6. Analysis of the diet of Champsocephalus gunnari at South Georgia in late summer from 1994 to 1997, Dr Eduardo L. Holmberg surveys

   two species in the diet of C. gunnari was reversed. The consumption of other prey items such as mysids ... well as fish, was only occasional or negligible and varied from year to year. The spatial distribution ... /without food in Subarea 48.3, did not show a consistent pattern from year to year.  Likewise, in the four ... length of C. gunnari did not reveal any selectivity pattern for any of the prey items. The availability ... frozen at -30°C and later examined at the Instituto Antiirtico Argentino. For the aim of this study ... definite spatial pattern, except for an apparent higher concentration of krill in the southeastern part ... (Figure 6). The historical range for the period December to February is 10 to 20% (Kozlov et al., 1988 ... was 220, mainly due to the low abundance of C. gunnari in that year (see below). Except on a few ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 103–123 : Auteur(s): Barrera-Oro, E., R. Casaux and E. Marschoff

7. Beyond MSY: a consideration of definitions of management objectives

   / Description:  The concept of ‘Maximum Sustainable Yield’ (MSY) has provided a useful guideline for resource ... assessment. Suggestions are made for the provision of advice to the Commission for the finfish and krill ... Article II of the CCAMLR Convention. The criteria will depend on whether the main concern is with ... CONSIDERATIONS Recruitment overfishing A fish population is usually thought of in two parts. For the first ... fishing practice, the distinction is an important one that exists for all fish except perhaps for a f~w ... North Sea plaice for two ages of first capture are shown in Figure 2. Apart from a constant, these ... largest stock in the data series, the MNR for plaice being indeterminate but certainly less than 30 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 299-322 : Auteur(s): Gulland, J.A.

8. Commercial krill fisheries in the Antarctic, 1973 to 1988

   :  STATLANT data reported to the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR ... ) are used to discern observable trends in catch and effort for the Antarctic krill (Euphausia superba ... split-years; a split-year being the twelve month period from 1 July in one year to 30 June in the next ... . The catch year is designated according to the second of the two split-years. Krill ST ATLANT data ... /76 season when no krill were taken in this area) than in Statistical Areas 58 and 88 for anyone year ... /84 catch in these two subareas closely resembles the overall trend for Statistical Area 48 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 229–281 : Auteur(s): Miller, D.G.M.

9. Champsocephalus gunnari stock status in the South Georgia area

   intensity was F 0.1. In the first two cases TAC=25-30 thousand tonnes and stock size does not change. For ... recruitment was taken at the lowest possible level for all these years (400 million specimens). Catch-per-unit ... / Description:  ata of age composition and fishing effort for 1976/77-1987/88 were used to analyse stock status ... and TAC for C. gunnari. Stock estimates were obtained using VPA with the following variations: mean F ... was FO.1• In the first two cases TAC=2S-30 thousand tonnes and stock size does not change. For the ... individuals). Biomass (thousand tonnes). Stock status and T AC prediction if F is an average value for the ... , using F regression on fishing effort and method of average weighted F. For 1986/87 the values ... possible level for all these years (400 million specimens). Catch-per-unit-effort was also taken at the ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 1-18 : Auteur(s): Borodin, R. and P. Kochkin

10. Evidence to support the annual formation of growth zones in otoliths of Antarctic toothfish (Dissostichus mawsoni)

    in each consecutive mode. This indicates that the modes represented year classes and that one ... valid method for determining the age of this species. In addition, sagittal otoliths were examined from ... , 2.5 and 3.5 years were estimated to be 14, 28, 37 and 46 cm total length (TL) respectively. These ... fish younger than 3.5 years. Counting translucent zones in the otoliths of D. mawsoni appears to be a ... unknown. An examination for daily growth zones was unable to provide any information on the likely time ... is from 0.6 to 4.0 cm yr-1 for fi sh aged from 15 to 30 years. It is interesting that all the ... . 0 20 40 60 80 100 120 140 160 180 0 5 10 15 20 25 30 Age (years) To ta l l en gt h ... baked whole in an oven at 280°C for about 5 minutes until they were a light amber colour. The ...

    Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 125–138 : Auteur(s): Horn, P.L., C.P. Sutton and A.L. DeVries

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