Résultats de la recherche

1. Potential interactions between wandering albatrosses and longline fisheries for Patagonian toothfish at South Georgia

   Patagonian toothfish at South Georgia Abstract / Description:  We examine the extent of overlap between South ... that D. exulans breeding at South Georgia have a relatively low potential risk of interaction with ... through mid-May, adult birds of both sexes spend most of their time at sea over the South Georgia ... continental shelf in areas very similar to where the longline fishery operates and are therefore at serious ... , respectively. We conclude that D. exulans breeding at South Georgia have a relatively low potential risk of ... period, from March through mid-May, adult birds of both sexes spend most of their time at sea over the ... of year, when chicks need frequent feeding and one parent remains at the nest brooding or guarding ... Figure 4. This fishery operates mainly over the edge of the continental shelf at depths of around 1 000 ...

   Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 101–110 : Auteur(s): Croxall, J.P. and P.A. Prince

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

   population numbers-at-length. A comparison of this method and the existing age-based CMIX/GYM methodology ... Paper Title:  Length-based assessment for mackerel icefish (Champsocephalus gunnari) at South ... model (GYM) packages, which derives population numbers-at-age and projects these numbers forward under ... accurate identification of age cohorts from the survey data. In this paper a length-based approach is ... estimate of the population numbers-at-length. A comparison of this method and the existing age-based CMIX ... assessment of mackerel icefish (Champsocephalus gunnari) at South Georgia which requires the clear ... -percentile of this bootstrapped biomass, along with the CMIX-derived population density-at-age, is used to ... from the length-based method. methods Population abundance-at-length The process of estimating the ...

   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

3. Toothfish, Dissostichus eleginoides, at South Georgia

   longliner in January 1990 indicates that the fish are sexually mature and, at the time of sampling, are ... Paper Title:  Toothfish, Dissostichus eleginoides, at South Georgia Abstract / Description:  The ... Dissostichus eleginoides fishery at South Georgia has expanded greatly in recent years. It has been claimed ... , paragraph 106). Histological examination of the gonads of a small sample of fish taken from a commercial ... indicates that the fish are sexually mature and, at the time of sampling, are approaching spawning ... WG-FSA-90n TOOTHFISH, DlSSOSTICHUS ELEGINOIDES, AT ... SOUTH GEORGIA I. Everson and S. Campbell* Abstract The Dissostichus eleginoides fishery at South ... examination of the gonads of a small sample of fish taken from a commerciallongliner in January 1990 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 255–261 : Auteur(s): Everson, I. and S. Campbell

4. Significant intra-annual variability in krill distribution and abundance at South Georgia revealed by multiple acoustic surveys during 2000/01

   at the island and have shown that the timing of the acoustic survey can affect signifi cantly the ... Paper Title:  Significant intra-annual variability in krill distribution and abundance at South ... acoustic surveys of Antarctic krill (Euphausia superba) were conducted around South Georgia in the 2000/01 ... March 2001 (late-season). The surveys were the first in a newly planned five-year series of observations ... predator species, some of which breed ashore at Bird Island but forage for krill, sometimes quite widely ... surveys at the very beginning and end of the fi eld season (October and March) in addition to the main ... logistic call at South Georgia before the onset of winter. SURVEY DESIGN The survey design, adapted from ... and west survey boxes suggested that semivariance reached a plateau at a range of less than 10 km ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 71–82 : Auteur(s): Brierley, A.S., C. Goss, S.A. Grant, J.L. Watkins, K. Reid, M. Belchier, I. Everson, M.J. Jessop, V. Afanasyev and J. Robst

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

   Paper Title:  Seabird interactions with longlining operations for Dissostichus eleginoides at the ... South Sandwich Islands and South Georgia Abstract / Description:  During seven days of operations ... involving the setting and hauling of longlines to catch the toothfish Dissostichus eleginoides around the ... increased rapidly after dawn and large numbers of Cape, giant and storm petrels and smaller numbers of white ... baited hooks, reduction of lights at night, and avoidance of the dumping of offal during longline ... on the starboard side of the vessel. Incoming fish were gaffed to prevent escape at the surface ... two hatches at the stern of the ship, where each coil was paid out after being weighted and tied to ... vicinity of the ship was recorded every 30 minutes. Almost all setting took place at night. The ship's ...

   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

6. Killer whale (Orcinus orca) and sperm whale (Physeter macrocephalus) interactions with longline vessels in the Patagonian toothfish fishery at South Georgia, South Atlantic

   with longline vessels in the Patagonian toothfish fishery at South Georgia, South Atlantic Abstract ... fishing operations were recorded by CCAMLR observers between 2000 and 2002 at South Georgia (Subarea 48.3 ... ). Demersal longlines, targeting Patagonian toothfish (Dissostichus eleginoides), were deployed in depths of ... most abundant marine mammal observed in the vicinity of vessels when lines were being hauled, being ... the Ross Sea at 78°S (Rice, 1998). Killer whales generally feed on a wide range of prey, and in the ... observations of killer whales and sperm whales interacting with longline vessels at the Falkland/Malvinas ... fi sh- ery at South Georgia ranged in length from 44 to 59 m (mean = 53 m), with a GRT of between ... at random intervals in order to cover as much as possible of the period when lines were being ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 111–126 : Auteur(s): Purves, M.G., D.J. Agnew, E. Balguerías, C.A. Moreno and B. Watkins

7. Length-at-age in juvenile Patagonian toothfish (Dissostichus eleginoides)

   Paper Title:  Length-at-age in juvenile Patagonian toothfish (Dissostichus eleginoides) Abstract ... / Description:  We used the otoliths from a sample of Dissostichus eleginoides pre-recruits, whose length ... estimated from reading otoliths in a goodness-of-fit test. The majority of the otoliths (83.6%) were ... estimated to be from fish 1+ or 2+ years old, with mean total lengths of 32.5 cm and 41.3 cm respectively ... discussion at WG-FSA indicated that there was a clear need for validation of the age of individual fi sh ... survey. From the resulting age-at- length matrix the proportions of the population at each age ... , indicating a delay of several months in the formation of the opaque zone at South Georgia. If this is ... . At present, fi sh showing the fi rst translucent zone on the edge of the nucleus in January are con ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 1–10 : Auteur(s): Ashford, J., C. Jones, S. Bobko and I. Everson

8. Marine debris and fishing gear associated with seabirds at sub-Antarctic Marion island, 1996/97 and 1997/98: in relation to longline fishing activity

   Paper Title:  Marine debris and fishing gear associated with seabirds at sub-Antarctic Marion ... debris found in association with seabirds at sub-Antarctic Marion Island for the period May 1996 to April ... and the 1997/98 field seasons. Fishing gear increased at a rate 10 times higher than 'other' ... been found in association with seabird nests at Marion Island. Fishery-related marine debris was found ... Island, CCAMLR INTRODUCTION Anthropogenic items floating at the surface of the sea are frequently ... (end of brood phase) and at monthly intervals between May and November/December (chick fledging ... nests at Marion lsland during this study (Table l), of which most (80%) were from the 1997/98 field ... . Prior to this report, only five reports existed of entanglements of seabirds at Marion Island since ...

   Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 85–96 : Auteur(s): Nel, D.C. and J.L. Nel

9. Growth and age/length structure of populations of Notothenia (Lepidonotothen) squamifrons (Nototheniidae) in various areas of the Indian sector of the Southern Ocean

   Paper Title:  Growth and age/length structure of populations of Notothenia (Lepidonotothen ... ) squamifrons (Nototheniidae) in various areas of the Indian sector of the Southern Ocean Abstract / Description ... :  Age, growth and age/length composition of populations of grey rockcod (Notothenia (Lepidonotothen ... ) squamifrons), inhabiting areas of the Ob and Lena Banks and the Kerguelen Island Shelf, are presented in this ... the last years of life. Maximum annual weight increments of 100 to 120 g at the banks and 153 to 188 ... , (Le. to the point at which the sclerites begin to merge). The results of the count were processed on ... considered normal at P=0.2. Moreover, single variable statistics of distribution of sclerites in each annual ... theoretical maximum length and one-third of its maximum body weight at the age of 9 years on the Lena Bank ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 123–139 : Auteur(s): Zaitsev, A.K.

10. Further computations of the consequences of setting the annual krill catch limit to a fixed fraction of the estimate of krill biomass from a survey

    Paper Title:  Further computations of the consequences of setting the annual krill catch limit to ... a fixed fraction of the estimate of krill biomass from a survey Abstract / Description:  Butterworth ... et al. (1992) put forward an extension of the harvesting model of Beddington and Cooke (1983) to ... relate potential krill yield to a pre-exploitation survey estimate of krill biomass. In this paper, the ... taken to be the biomass of mature animals at the start of the growth period. This model will be ... drawn at random from pre-specified distributions for each simulation of a 20-year period of harvesting ... and maturity-at-age functions, these are modelled by a different shape as a function of length ... 0.083 0.051 0.009 Table 2: Median values of the distributions of depletion at the end of the 20-year ...

    Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 81–106 : Auteur(s): Butterworth, D.S., G.R. Gluckman, R.B. Thomson, S. Chalis, K. Hiramatsu and D.J. Agnew

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