Résultats de la recherche
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Revised age and growth estimates for Antarctic starry skate (Amblyraja georgiana) from the Ross Sea
been generated that suggest much slower growth, greater ages-at-maturity (about 20 years compared with ... 6–11 years) and greater maximum ages (28–37 years compared with 14 years). Several pieces of ... georgiana in the Ross Sea suggested that these skates initially grow very rapidly for about five years ... with 6–11 years) and greater maximum ages (28–37 years compared with 14 years). Several pieces of ... outliers with positive residuals, centred on about 75 cm and 18 years, was apparent for both readers ... with negative residuals, centred on about 38 cm and 12 years, suggested some over- ageing by both ... was 37 years compared with 28 years by reader 2. Reader 2’s ages increased for all eight skates that ...
Science Journal Paper : CCAMLR Science, Volume 16 (CCAMLR Science, Volume 16) : 211–220 : Auteur(s): Francis, M.P. and M.J. Gallagher
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Geographical differences in the condition, reproductive development, sex ratio and length distribution of Antarctic toothfish (Dissostichus mawsoni) from the Ross Sea, Antarctica (CCAMLR Subarea 88.1)
seasonally on Antarctic toothfish (Dissostichus mawsoni) from mid-December to early April during the 2000/01 ... with the southern group (in which the distribution was multimodal), showed a consistent and ... essentially unimodal with the average value for all years occurring at about 141 cm TL for males and 152 cm ... toothfish (Dissostichus mawsoni) from mid-December to early April during the 2000/01 to 2004/05 fishing ... distribution at a consistent peak over all sampling seasons in comparison with the southern group (in which ... . The girth meas- urement was made by encircling the body imme- diately behind the pectoral fins with ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 27–45 : Auteur(s): Fenaughty, J.M
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Analysis of albatross and petrel distribution within the CCAMLR Convention Area: results from the Global Procellariiform Tracking Database
, the subareas with the highest proportion of albatross and petrel breeding distribution were Subareas ... petrel breeding ranges extend across the majority of the Convention Area. Subareas with the lowest ... interactions with longline fisheries. Ibis, 140 (3): 446–457. Catry, P., R.A. Phillips, B. Phalan, J.R.D ... southern giant petrel, white-chinned petrel and short- tailed shearwater. Overall, the subareas with the ... extend across the majority of the Convention Area. Subareas with the lowest proportion of breeding ... breeding pop- ulations are well documented, with 19 of 21 species now globally threatened and the ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 143–174 : Auteur(s): BirdLife International (prepared by C. Small and F. Taylor)
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Notes on the use of virtual population analysis for stock assessment of the mackerel icefish, Champsocephalus gunnari (Lönnberg, 1906) in Subarea 48.3 for the 1990/91 and 1991/92 seasons
techniques, from 1991 back to 1977. The predicted age structure, dominated in recent years by the 1987 year ... -class (1 year olds in 1988), was quite robust, despite the use of various combinations of survey and ... proportion of 5 year olds, which was not observed during the survey on Falklands Protector in January 1992 ... . Breakdown in the credibility of the VPA results in most recent years is attributed to the invalid assumption ... projected forwards 2 years, with the 1 year olds being replaced by a simulated value, firstly with no ... absence of this year class, the TAC would be extracted from the younger, less abundant year classes, with ... year old fish, with 5 year olds comprising less than 5% of the fishable population biomass. Assuming ... 1990/91 was again dominated by 4 year olds, as with all of the Laurec-Shepherd tuned VP A runs. Age ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 49–79 : Auteur(s): Parkes, G.
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Survey design to estimate krill abundance during FIBEX
echosignals or from examination of echocharts with respect to integrator output. 4. The operating frequency ... information indicated that krill would be distributed northwards from the pack ice zone (Marr 1962 ... ; Mackintosh 1973) with the abundance decreasing rapidly some distance from the ice edge. 3.2 Selection of ... coincide with a periodicity in the krill distribution, is eliminated. 4. By taking account of the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 253–263 : Auteur(s): Everson, I., I. Hampton and G.M. Jolly
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Changes in biomass of eight species of finfish around the South Orkney Islands (Subarea 48.2) from three bottom trawl surveys
the South Orkney Islands (Subarea 48.2) suffered substantial declines from split-year 1977/78 to 1989 ... commercial fishery during the 1970s and early 1980s. It is unlikely that with 64 hauls we simply missed a ... 3) was 38 900 tonnes (SE = 9 261), with a relatively moderate 95% confidence interval. Although ... Orkney Islands (Subarea 48.2) suffered substantial declines from split-year 1977/78 to 1989/90. The ... eleginoides and unspecified finfish species. The first year of fishing yielded a catch of almost 140 000 ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 53–74 : Auteur(s): Jones, C.D., K.-H. Kock and E. Balguerías
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Use of the Leslie stock depletion model for the assessment of local abundance of Patagonian toothfish (Dissostichus eleginoides)
1989/90. Since then the reported catch has been in the region of 3 000 to 4 000 tonnes, with the ... on the target species is difficult to assess, particularly in the early years of the fishery when ... fishery in Subarea 48.3 include a lack of detailed data from the early years of the fishery, differences ... ) Total Number of Series with Correction Applied 17 5 3 4 0 61 Total Numberof Data Series ...
Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 55–77 : Auteur(s): Parkes, G., C.A. Moreno, G. Pilling and Z. Young
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Preliminary results of research activities of RV Evrika in the Scotia Sea in January-March 1988
Sea and adjacent waters, accompanied by regular trawlings with an Isaac-Kidd trawl. The waters off ... -disciplinary survey was conducted of the Scotia Sea and adjacent waters, accompanied by regular trawlings with ... penetrated the eastern part of the area from the east and were characterized by surface temperatures ranging ... waters off South Georgia which corresponded with the high dynamic activity of waters in the area during ... production being in a reverse proportion to photosynthesis production values. As compared with previous ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 215-229 : Auteur(s): Maklygin, L.I., A.S. Fedorov, V.N. Shnar, Yu.A. Shulyakovsky, I.V. Krasovsky, Yu.D. Shuvaev and A.V. Kromsky
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Indices of prey availability near the Seal Island CEMP site: 1990 to 1996
surveys each year were subsampled to include the foraging range of predators breeding at Seal Island ... of Elephant Island, and between 25 and l00 m depth. Indices of average prey density agree with ... relative biomass of juvenile krill near Seal Island during the first survey of each year as compared to the ... biomass of post-spawning adults near Seal Island during the second survey of each year. It is hoped that ... (Figures 3 and 4). Two surveys were selected for each year, details of which are listed in Table 1. For ... for each year. Designation 3 and 4 D D D D D D Dates 6 - 11 Jan, 21 - 26 Jan 21 - 31 ... juvenile krill appear in the late spring and early summer and are later displaced by spawning adults ... Seal Island, and persistence over time. Acoustic data from two AMLR surveys each year were subsampled ...
Science Journal Paper : CCAMLR Science, Volume 4 (CCAMLR Science, Volume 4) : 37–45 : Auteur(s): Hewitt, R.P., G. Watters and D.A. Demer
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The error of the biomass estimate as a function of survey parameters and the statistics of a density field of krill aggregations
with the help of mathematical statistics and methods of calculus of probabilities. The biomass estimate ... of the survey with respect to the axis of the correlation ellipse and the frequency of transects ... concentration density field and on parameters of the survey itself, have been derived with the help of ... variation serve as field characteristics on which the error depends. The direction of the survey with ... ecological meaning, it is necessary to supply them with ,confidence intervals indicating the limits of ... possible errors with desired probability. Thus, it is important to find out on whioh parameters of survey ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 213-228 : Auteur(s): Kizner, Z.I.