Résultats de la recherche

1. Sensitivity investigation of the SDWBA Antarctic krill target strength model to fatness, material contrast and orientation

   marine organisms. A stochastic version, the so-called SDWBA model, is endorsed by CCAMLR to predict the ... , has been endorsed as a standard measure for E. superba. Demer and Conti (2003) found the best fit by ... et al., 2002; Demer and Conti, 2003). The scattering from an object is given by its form, size and ... fluid­like marine organisms. A stochastic version, the so­called SDWBA model, is endorsed by CCAMLR to ... animal’s body by digitising the main morpho- logical structures in two dimensions. McGehee et al. (1998 ...

   Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 97–122 : Auteur(s): Calise, L. and G. Skaret

2. A comparison between otoliths and scales for use in estimating the age of Dissostichus eleginoides from South Georgia

   ; for otoliths, we used transverse sections prepared by baking and grinding the posterior and anterior ... ; for otoliths, we used transverse sections prepared by baking and grinding the posterior and anterior ... fish can be obsc~lred by compression of the circuli as growth slows wit11 age. As a result, true age ... considered high after maturity even though active growth continued. By contrast, Beamish and Harvey (1969 ... significantly different from ages using otoliths, while the precision of ages read by two readers was greater ...

   Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 75–92 : Auteur(s): Ashford, J.R., S. Wischniowski, C. Jones, S. Bobko and I. Everson

3. The foraging range of Adélie penguins at Béchervaise Island, Mac. Robertson Land, Antarctica, and its overlap with the krill fishery

   ) were determined by satellite tracking using the ARGOS system. Birds were tracked over four foraging ... penguins breeding at Bechervaise Island near Mawson Station (Mac. Robertson Land) were determined by ... . INTRODUCTION The foraging range of Ad6lie penguins is limited during the breeding season by the time they ... highlighted by Agnew (1991). He pointed out the theoretical possibility of the existing krill fishery taking ... an amount of krill up to 50% of that required by these krill predators to successfully raise their ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 337–344 : Auteur(s): Kerry, K.R., J.R. Clarke and G.D. Else

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

   its life cycle was studied using material collected by AtlantNIRO from 1970 to 1991. This study took ... cm in length) were mainly found in the southern part of the study area, immature fish (15–25 cm) in ... fish were found to be distributed throughout the water column at all times of the day, but they also ... undertake vertical diurnal migrations similar to those of mature fish. Mature fish were found near the ... were found in catches taken by pelagic and bottom trawls. During the entire observation period fi sh ... of its life cycle was studied using material collected by AtlantNIRO from 1970 to 1991. This study ... . Variability of the distribution of C. gunnari by depth stratum and season at various stages of its life ... developmental stage were analysed. MATERIAL AND METHODS The data used in this study were collected by ...

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

5. Length-based assessment for mackerel icefish (Champsocephalus gunnari) at South Georgia

   which were explained by an unusual length distribution from which it was difficult to reliably estimate ... differences for 2008 which were explained by an unusual length distribution from which it was difficult to ... such an assessment the HCR applied would be the same but the process by which the size of the initial ... stratified sur- vey density data Il,m,n by length bin l, region m, and haul n, for each length bin the data ... survey den- sity by length bin and region. A population length frequency was then derived by taking a ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 129–137 : Auteur(s): Hillary, R.M., C.T.T. Edwards, R.E. Mitchell and D.J. Agnew

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

   aggregations. Krill was harvested by standard midwater trawls with a horizontal mouth opening of 33 m. All ... . An echo sounder was used to assess the characteristics of kriU aggregations. KriU was harvested by ... grounds (Endo and Ichii, 1989). These characteristics are determined by environmental factors as well as ... basis of echogram recordings according to a methodology developed by AtlantNIRO (1985). Since a ... recorded as a scattered layer in the 10 to 140 m depth range with interrupted, short tracks formed by ...

   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

7. Distribution of krill (Euphausia superba Dana) catches in the South Shetlands and South Orkneys

   fishery may have to increase by a factor of 2 or 3 before ratios of catch to consumption approach maximum ... by a factor of 2 or 3 before ratios of catch to consumption approach maximum sustainable levels, any ... to the total consumption of krill by birds and seals (estimated by Miller and Hampton, 1989 to be ... followed by a shift to fishing to around the South Orkneys and South Shetlands in the summer, as the ... these colonies are therefore unlikely to be directly affected by fishing activity. The total number ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 287–303 : Auteur(s): Agnew, D.J.

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

   examined, and the translucent zones counted. Zone counts were consistent within modes, and increased by one ... consistent within modes, and increased by one in each consecutive mode. This indicates that the modes ... by Horn (2002) based on readings from the otoliths of approximately 1 500 fi sh sampled in the Ross ... previously been reported by Burchett et al. (1984). The calculated growth curves from the two studies were ... 31 of these fi sh were weighed to the nearest 0.1 mg. They were prepared for reading by being ...

   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

9. Assessment of krill flux factors in waters of South Orkney Islands during summer 1996

   of the study area, it was only possible to assess krill flux caused by waters of the southern ... krill flux caused by waters of the southern periphery of ACC. Based on estimations of krill density and ... subject to significant of experimental data. transport by oceanic currents d o not provide a basis ... a t (SC-CAMLR, 1990 and 1991). Horizontal krill flux assessing krill transport by oceanic ... or 48.3) by means of evaluating geostrophic velocity profiles of water mass transport and krill ...

   Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 195–204 : Auteur(s): Kasatkina, S.M., V.N. Shnar, M.I. Polischuk, A.M. Abramov and V.A. Sushin

10. Utilising data from ecosystem monitoring for managing fisheries: development of statistical summaries of indices arising from the CCAMLR Ecosystem Monitoring Program

    statistical procedure adopted by WG-EMM in 1996 for identifying anomalies in CEMP parameters. The power of the ... procedure to detect anomalies was found to fall to low levels once more than a few anomalous values have ... series, was found to have consistently better statistical power regardless of the accumulation of ... statistical procedure adopted by WG-EMM in 1996 for identifying anomalies in CEMP parameters. The power of ... lines adopted by WG-EMM in 1996. That is, transforming each parameter in order to obtain roughly a ... parameters in a given year is given by: where X, is the vector of observed values of the parameters in ... also a scalar given by: de ia Mare and Constable Table 1: Means and coefficients of variation ...

    Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 101–117 : Auteur(s): de la Mare, W.K. and A.J. Constable

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