Résultats de la recherche

1. Distribution of mackerel icefish (Champsocephalus gunnari) (Channichthyidae) around South Georgia at various stages of its life cycle

   cm in length) were mainly found in the southern part of the study area, immature fish (15–25 cm) in ... the east and southwest, and adults (25–39 cm) in the north. The distribution of C. gunnari changes ... bottom during the day and in the water column at night. Larger fish (>40 cm) did not undertake ... vertical migrations. Variations found in the depth distribution of C. gunnari relate both to fish length ... May–June. The time of spawning relates to the temperature regime of the year, i.e. in warmer years ... showed that 1-year-old fi sh (<15 cm) were mainly distributed in pelagic waters. The distribution of ... / 19 86 L en gt h ra ng e (m m ) 60 –1 30 80 –1 30 60 –1 40 70 –1 20 M od al le ng th ... 0 m m 28 % 20 % 90 m m 10 0 m m 44 % 47 % N um be r of in d iv id ua ls ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 49–69 : Auteur(s): Frolkina, Zh.A

2. Quantification of Southern Ocean phytoplankton biomass and primary productivity via satellite observations and biogeochemical models (submitted to the 2008 Joint CCAMLR-IWC Workshop)

   described, from the Coastal Zone Colour Scanner (CZCS) in the late 1970s through to the Ocean Colour and ... regard to their use in the Southern Ocean. A brief history of algorithms linking ocean colour to primary ... calculate primary productivity, usually in units of mmolC m–2 or mgC m–2 per unit time (day or year). In ... highest monthly productivity number they calculated (based only on one year of data, 1997/98) was in ... ) data as input. Note the close match in the modelled and observed estimates for each of the six years ... significant spatial and temporal vari- ability in primary productivity. It is also the region of the global ...

   Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 247–265 : Auteur(s): P.G. Strutton, N.S. Lovenduski, M. Mongin and R. Matear

3. The foraging range of Adélie penguins – implications for CEMP and interactions with the krill fishery

   closest edge of a polynya which forms each year in this region (Kerry et al., 1995a). The location of ... undertaken are shown in Figure 1. The numbers of penguins tracked, the numbers of trips and the years over ... krill has previously been harvested, may lie within their foraging range in other years. DISCUSSION ... overlap between the foraging areas of these birds and the areas where krill fishing has taken place in ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 75–87 : Auteur(s): Kerry, K.R., J.R. Clarke, S. Eberhard, H. Gardner, R.M. Lawless, S. Corsolini, S. Focardi, E. Franchi, D. Rodary and R. Thomson

4. Spawning locations of mackerel icefish at South Georgia

   . There are also indications of a possible second spawning season in January, although the evidence is ... weak. Concentrations of larval icefish within Cumberland Bay are an order of magnitude higher than in ... , spawning, South Georgia, CCAMLR INTRODUCTION Over the past 30 years there has been a fishery, large in ... following day, two on 20 March and 14 on 30 March. 011 5 April the catch was just three, and no further ... place close inshore or in the fjords. Added weight was given to these conclusions by Kock (1981), who ... of the same year. Further evidence that spawning occurs in the inshore waters has come from the ...

   Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 107–118 : Auteur(s): Everson, I., A.W. North, A. Paul, R. Cooper, N.C. McWilliam and K.-H. Kock

5. Estimates of circumpolar abundance of Antarctic krill based on recent acoustic density measurements

   tonnes- at the low end of values that have been suggested in the past. The differences between our ... . Additionally, the current precautionary catch limits in the South Atlantic are set using a superseded acoustic ... survey of the South Atlantic in January 2000 may result in an effective biomass which is greater than the ... value used in the past. The seasonal and local consequences of large catch limits will have to be taken ... conducted regularly in some areas for nearly 20 years, and there is now a good appreciation of the range ... year-'). Possible reasons for this mismatch include: bias in the acoustics (partially rectified by ... able to narrow the estimates of production from 75- 1 350 million tonnes per year (a factor of 20) to ... catch limit (1.5 million tonnes per year) for Area 48, based on surveys in Subareas 48.1,48.2 and 48.3 ...

   Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 87–99 : Auteur(s): Nicol, S., A.J. Constable and T. Pauly

6. Analysis and modelling of the Soviet Southern Ocean krill fleet, II: Estimating the number of concentrations and analytical justification for search data

   number of concentrations and analytical justification for search data Abstract / Description:  In this ... of concentrations of krill (Butterworth, 1988; Mangel, 1988) in a given region of the Southern Ocean ... . Sample computations are performed, using data collected by Soviet research/survey vessels in the early ... 1980s. These examples highlight the need for a navigational log as well as a fishing log in order to ... 18.9 hrs 693.6 (4-8), 61.2 (8-9) 1 290.4 50" 40' 20" o' 20' 40' 10' 30' 30' 10" 50" 60" 60 ... 10 15 20 30 40 50 60 70 Concentration Radius (nml) Figure 16: Histogram of the radii of ... SEARCH DATA M. Mangel Abstract In this paper, I show how data that are routinely collected by ... , 1988) in a given region of the Southern Ocean. Sample computations are performed, using data ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 283–322 : Auteur(s): Mangel, M.

7. Modelling and decision making as part of the CCAMLR management regime

   horizons, time steps, constraints and data) were identified in an attempt to provide a blueprint for the ... of CCAMLR Article II. Eight attributes (purpose, description, variables, driving forces, time ... for managers of renewable resources in terms of CCAMLR Article 11. In keeping with the ideas put ... . Nevertheless, the principles outlined in Article 11 of the Convention stress the need to conserve the ... disruption of ecosystem functioning. In these terms, Article 11 enunciates a mUltiplicity of objectives ... consider predators in view of the requirements in Article 11 for restoring depleted populations ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 295-322 : Auteur(s): Miller, D.G.M.

8. Do krill and salps compete? Contrary evidence from the krill fisheries

   krill in the catches was evident when both salps and krill were taken together. In the Livingston Island ... clear relationship was observed in the Elephant Island area. Possible reasons for these phenomena are ... particles greater than 20 pm (Wright et al., 1996). Therefore, in our case, salps may have been excluded ... the catches was evident when both salps and krill were taken together. In the Livingston Island area ... salp blooms may occur in different periods in some years. Do Krill and Salps Compete? When ... March, the peak of salp blooms may occur in different periods in some years. (iii) Results of the ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 205–216 : Auteur(s): Kawaguchi, S., T. Ichii, M. Naganobu and W.K. de la Mare

9. Size at sexual maturity of Patagonian toothfish (Dissostichus eleginoides)

   (Dissostichus eleginoides) caught in the commercial fishery within Subarea 48.3. The results for 1996 indicate ... that L m50 occurs at 78.5 cm total length for male and 98.2 cm for female fish. In 1997 the results for ... male fish were essentially the same. For female fish there is evidence that in 1997 a significant ... allowing for this bias indicates that L m50 for female fish in 1997 was no different to that for 1996. The ... leading to an enlarged ovary of about 20% of the fish total mass. Spawning occurs in the period July to ... maturation process was probably delayed in that year. The July/August period falls well within the ... statistically significant difference (p > 0.05 from deviance ratio tests) in any parameter between years ... with the estimates for 1996. This, together with the lack of evidence for any change in the slope of ...

   Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 37–46 : Auteur(s): Everson, I. and A.W. Murray

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

    whether a feedback approach is likely to achieve the multiple objectives that EBM implies in the complex ... Control (MPC) to achieve objectives for a harvested species, its predators and the fishery, in a ... spatially resolved annual catch limits in response to estimates of the state of the system. It suggests that ... process can be controlled through weight- ing. The area‐specific catches for the first year in the ... of 2 2 20 0 ' k k k Q R S x x u u u æ ö÷ç - + - + ÷ç ÷÷çè ø  in steady state, which can be ... model), in multiple future years, from their TRPs. It also penalises interannual variability in ... CCAMLR aims to develop a feedback manage- ment approach for the Antarctic krill fishery in the Scotia ...

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

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