Résultats de la recherche

1. Revised estimates of the area of the South Georgia and Shag Rocks shelf (CCAMLR Subarea 48.3)

   . North east corner °S °W 0– 50 50 –1 00 10 0– 15 0 15 0– 20 0 20 0– 25 0 25 0– 30 0 30 0 ... 0 15 57 47 26 20 12 8 185 18 54.5 38 0 0 19 634 690 282 130 92 63 76 1 986 19 54.5 37 28 30 270 847 ... 1 090 448 114 38 30 23 2 918 20 54.5 36 384 251 248 690 817 284 45 7 2 0 2 728 21 54.5 35 167 444 ... Belchier and Fretwell 168 introduction The area of sea floor within different depth strata in the South ...

   Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 167–175 : Auteur(s): Belchier, M. and P. Fretwell

2. Performance and geometry of the FP-120 trawl used during UK fish stock assessment surveys around South Georgia, Subarea 48.3

   opening (and, thus, swept area) of a bottom trawl are discussed. In situ measurements of the FP-120 trawl ... compared to values obtained from a previous equation. The resulting difference in biomass estimates is of ... (17, 20 and 21) were logged every 30 seconds and the fourth (22) every 20 seconds. The hydrophone ... seabed. shows track of headline height a t station 30, The captain was not aware of the information In ... to the nearest minute. 20 25 30 35 40 45 50 Station Figure 11: Trawl start times per station ... , biomass, finfish, CCAMLR INTRODUCTION Surveys using bottom trawls have been used for over 20 years to ...

   Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 51–69 : Auteur(s): Pilling, G. and G. Parkes

3. A von Bertalanffy growth model for toothfish at Heard Island fitted to length-at-age data and compared to observed growth from mark–recapture studies

   -estimated parameters. A young-age adjustment (less than 5 years old) to the VB model is also given in order ... frequencies were also included in defining relative probabilities, the VP maximum likelihood (MLPLB) and IWLS ... measured at release and first recapture in mark–recapture studies were compared where predictions used the ... developed and showed that the bias is relatively small for the range of release lengths in the data ... . Note the relatively small number of fi sh either greater than 1 000 mm in length or greater than 20 ... – 20 year range. This translated to larger predictions for the MLPLB-fi tted curve for ages below 5 ... than 5 years old) to the VB model is also given in order to give more realistic predictions of mean ... years in age. This is due to the combined effect of natural and fi shing mor- tality and the effect of ...

   Science Journal Paper : CCAMLR Science, Volume 14 (CCAMLR Science, Volume 14) : 43–66 : Auteur(s): Candy, S.G., A.J. Constable, T. Lamb and R. Williams

4. Australian research on Antarctic bird and seal diets

   data on the diets of important vertebrate predator species in Prydz Bay and around the sub-Antarctic ... results are collated and summarised, and several important points emerge. In Prydz Bay, on which is ... Pleuragramma antarcticum are important in most diets, and many predators can switch between prey species. The ... Heard and Macquarie Islands have been collected during the last seven years. Published and unpublished ... Davis Station (68°30'S:77°50'E), in the south-eastern corner of the Prydz Bay Priority Area of CEMP ... ) 20 38 3' 1 58 400 39 29 32 o Location: Sea ice off Davis Station (68°30'S: 77°50'E ... Fish (%wt) 28 32 5 20 24 32 25 Am ph ipods(%wt) 4 1 0.1 0.5 46 0 0 Chicks hatched in reference ... species in Prydz Bay and around the sub-Antarctic Heard and Macquarie Islands have been collected during ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 231-249 : Auteur(s): Williams, R.

5. Midwater trawl catchability as an aspect of a quantitative assessment of krill biomass conducted using a trawl census survey

   midwater trawls and small research trawls, in this case using an Isaacs-Kidd trawl, demonstrated the ... 47 59 30 23 20 29 17 cr, mean swann length (metres) 15 16 19 7 10 7 20 4 Swann density field in ... metodom tralovykh syemok. Trudy AtlantNIRO, Kaliningrad: 30-43 (in Russian). KASATKINA, S.M. 1988. K ... swann depth (metres) 42 29 41 24 29 25 30 21 cr, swann depth 13 20 13 8 10 14 16 8 Mean swann ... comparative analysis of trawl catchability for commercial midwater trawls and small research trawls, in this ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 257–272 : Auteur(s): Kasatkina, S.M.

6. Age and growth of Antarctic euphausiacea (crustacea) under natural conditions

   years for the krill Euphausia superba. Growth in length and weight was calculated by non-linear ... regressions. No difference in growth of krill was observed between the Antarctic Peninsula area and the ... species Euphausia triacantha, and a three-year life span proposed. Male Euphausia crystallorophias have a ... and generation time of each species is given. In general, Antarctic euphausiids seem to remature and ... krill Euthausia superba. Growth in length and weight was ca culated by non-linear regressions. No ... difference in growth of krill was observed between the Antarctic Peninsula area and the eastern Weddell Sea ... triacantha, and a three-year life span proposed. Male Euphausia cr¥stallorophias have a shorter life span ... generation time of each species is given. In general, Antarctic euphausiids seem to remature and spawn at ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 369-370 : Auteur(s): Siegel, V.

7. Vertical migrations of mackerel icefish (Champsocephalus gunnari) on the South Georgia shelf

   commercial concentrations of C. gunnari in years of high abundance of the species (1982/83, 1983/84 and 1986 ... may be used for clarification of survey techniques used in stock assessment. For a number of years ... considered in the paper. A distinct pattern of daily vertical migrations of C. gunnari was observed on the ... South Georgia shelf. During the day, fish concentrate near the bottom in concentrations 5 to 7 m thick ... used in stock assessment. For a number of years scientists of AtlantNIRO have been conducting trawl ... Scientists of several nations have in recent years carried out stock assessment studies of channichthyids ... in years of high abundance (1982/83, 1983/84 and 1986/87). Catch-per-hour of fishing was analysed by ... data from research vessels which had been fishing for commercial concentrations of C. gunnari in ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 3–14 : Auteur(s): Frolkina, J.A. and V.I. Shlibanov

8. An assessment of the mackerel icefish (Champsocephalus gunnari) off Heard Island

   conducted in 1990, 1992, 1993 and 1997. The assessments include estimates of all the parameters required ... of 900 tonnes in the 1997/98 season and 600 tonnes in 1998/99. File:  06delamare-etal.pdf ... respectively. The effects of a constant catch level (in tonnes) over a 20-year period were evaluated. The ... years from the two abundant cohorts of 1 500 tonnes, comprising 900 tonnes in the first year and 600 ... will be shown below, have different age structures in the same year and appear to have differences in ... (see de la Mare, 1994a for details). The estimated density of a given year class in a stratum was ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 79–101 : Auteur(s): de la Mare, W.K., R. Williams and A.J. Constable

9. A generalised model for evaluating yield and the long-term status of fish stocks under conditions of uncertainty

   the spawning stock biomass in accordance with CCAMLR criteria. These specify a bound on the ... specify growth, mortality, age-dependent selectivity and seasonal patterns in fishing mortality. Results ... -exploitation spawning biomass at some time over the 20-year projection period is equal to 10%. + Values in ... ) 1.21 I 0 10 20 30 40 50 60 Length (mm) Selectivity (b) 1.6 1 1 0 2 4 6 Age (years) Relative ... Uncertainty (a) Run 1 Biomass (thousand tonnes) Recruits (millions) 0 10 20 30 40 50 Years (b) Run 2 ... one-year projection, the exit numbers in each age class are assigned to the next highest age class ...

   Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 31–54 : Auteur(s): Constable, A. and W.K. de la Mare

10. Validation of sink rates of longlines measured using two different methods

    sight behind waves or in congregations of seabirds before the target depth was reached. No TDRs were ... 0.239 ± 0.016 m.s–1 to 20 m and were thus 30% slower than those measured to 20 m (Table 1). This ... , the sink rates to target depths of 2 and 20 m differed signifi cantly by 30% (Table 1). As the ... 0.260 0.300 0–2 2–5 5–10 10–20 20–50 Depth increment (m) S in k r a te ( m ) 0.300 0.260 ... during line setting, or bottles vanishing from sight behind waves or in congregations of seabirds ...

    Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 179–187 : Auteur(s): Wienecke, B. and G. Robertson

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