Résultats de la recherche

1. Beyond MSY: a consideration of definitions of management objectives

   Article II of the CCAMLR Convention. The criteria will depend on whether the main concern is with ... recruitment or growth overfishing. Account also needs to be taken of the uncertainties associated with any ... reasonably precisely. In the conditions of the north Atlantic in the early 1970s, with consensus being ... that, with due reservations for the temporary effects of the occasional very large year-class, the ... nominal effort each year, based on the values of F and fishing effort in the most recent years. Since ... Convention. The criteria will depend on whether the main concern is with recruitment or growth overfishing ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 299-322 : Auteur(s): Gulland, J.A.

2. Fishing for toothfish using pots: results of trials undertaken around South Georgia, March–May 2000

   pots with a line length of 5 000 m. During the 112 sets made in the trial period, 150 pots were lost ... carapaces. A total of 177 fish (3% of catch) with a size range of 62 to 136 cm were discarded due to ... these were at maturity stage 1. Very few crabs with eggs at maturity stage 3 (eggs dead) were found. A ... with other areas in the Convention Area, still catches significant numbers of seabirds. Calculations ...

   Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 93–105 : Auteur(s): Agnew, D.J., T.M. Daw, G.M. Pilling and M.G. Purves

3. Natural mortality rate in the mackerel icefish (Champsocephalus gunnari) around South Georgia

   and Dorovskikh (1991), with an age/length key from 1972 used to devise a separate age composition ... year, recruitment is constant; (iii) sampling of the population is random with respect to age; and ... the same region, but several years later, as is the case with the Frolkina and Dorovskikh (1991 ... . The age/length key from 1972 was obtained from a period several years after large-scale fishing ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 245–257 : Auteur(s): Everson, I

4. The ecosystem approach to managing fisheries: achieving conservation objectives for predators of fished species

   inainmals - M AG Americas, 2000) Age at maturity (years) Plus class Natural mortality (year-]) Body ... 3 in the food web. The siinulatio~i is seeded with initial values for each of the five species ... and run for 500 years before a trial begins. The trial is run for 100 years with fishing beginning ... respectively, and (d) Predator 3 with selection values of prey species 1 and 2 being 0.2 and 1.0 respectively ...

   Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 37–64 : Auteur(s): Constable, A.J

5. Differences in distribution and population structure of krill (Euphausia superba) between penguin and fur seal foraging areas near Seal Island

   identify and evaluate their foraging areas during early January 1990/91. Penguin foraging areas were found ... the surface throughout the day. With regard to body size and maturity of krill in the inshore foraging ... dominant with occasional occurrences of juveniles (modal length 21 mm). In contrast, in the offshore ... occurred only occasionally but in large aggregations (surface length about 2 to 3 km) of higher densities ... ), middle-sized krill (modal length 43 mm) were dominant with occasional occurrences of small specimens ... the study period (early January). Later in the season (mid-February) NOAA conducted another tracking ... -February. Moreover, foraging trip duration was shorter in February (1 to 3 days) than in January (5 to 9 ... conducted to identify and evaluate their foraging areas during early January 1990/91. Penguin foraging ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 273–285 : Auteur(s): Ichii, T., H. Ishii, J.L. Bengtson, P. Boveng, J.K. Jansen and M. Naganobu

6. A hypothetical life cycle for Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea region

   continental shelf; south onto the Ross Sea shelf; or eastwards with the eastern Ross Sea gyre, settling out ... location and timing of spawning and the probable early life-history characteristics of toothfish, the drift ... locations of toothfish larvae after an 18–24 month period were moderately consistent with the distribution ... eastwards with the eastern Ross Sea gyre, settling out along the continental slope and shelf to the east of ... veered to the south at around 62°S 150°W, coincident with the eastern end of the model’s eastern gyre ... ) and a research trip was carried out into Subarea 88.3 (Patchell, 2005). Over the past 10 years ... 250 m, with over 50% taken at the sea surface (upper 3 m). The period of passive larval drift is ...

   Science Journal Paper : CCAMLR Science, Volume 15 (CCAMLR Science, Volume 15) : 35–53 : Auteur(s): Hanchet, S.M., G.J. Rickard, J.M. Fenaughty, A. Dunn and M.J. Williams

7. Environment–krill relations in the South Georgia marine ecosystem

   were only expressed strongly in years of extreme conditions. The correlation with water temperature was ... atmospheric components of the system, and there are also correlations with CPUE data. The CPUE index generally ... agrees with other data which give direct or indirect indications of krill availability, suggesting it can ... be a useful index for some regions. Associations with ice-edge position and atmospheric components ... CPUE values in the same year (Figure l ld). Lower catch rates were also associated with higher water ... components were only expressed strongly in years of extreme conditions. The correlation with water ... were available; 3 - position of ice-edge in March of a particular year. Environment-Krill ... 0 73 74 75 76 7 7 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 Year Figure 3: Variation in ...

   Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 13–30 : Auteur(s): Fedoulov, P.P., E. Murphy and K.E. Shulgovsky

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

   season: in October 2000 (early-season); during late December/early January 2000/01 (mid-season), and in ... March 2001 (late-season). The surveys were the first in a newly planned five-year series of observations ... Survey since 1996 (and on a more ad hoc basis since the early 1980s). We hoped that conducting several ... from more restricted once-per-season ‘snap-shot’ cruises in a broader context. The early- and late ... broader context. The early- and late-season surveys were associated with logistic support voyages to ... the consequences of reduced sampling effort in the early and late surveys for comparison with the ... eastern box, which, with associated stations, took more than 48 hours out and back, the intention was to ... , central, east, south. With the exception of one transect in the south- ern box (the planned eastern most ...

   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

9. Problems of population age structure determination of Euphausia superba Dana using an example from the Antarctic Peninsula area and adjacent waters

   ;HOH qaCTli MOPH K BOCTOKY li oopasyeT T.H. Ys,n;,n;enn- OBCKliH ,D;peH~ (Marr, 1962, Mackintosh, 1972 ... , MOJIO~b H BSpOCJI@eOCOOH (Fraser,1936, Bargman, 1945, Marr, 1962,Mackintosh, 1972, MaKapOB, 1980, 1983 ... (1962) C~HTan, ~TO B npHMaTepHKOBhlX MOPRX E.superba Tpe6yeTcfl npHMepHo TpH ro~a ~R Toro, ~To6 ... . ~eTanbH@H aHanHS mnpOTHOH - 232 - HSMeH~HBOCTH POCTOBHX XapaKTepHCTHK 6hln ~aH H.A.MaKHHTollieM (1972 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 227-270 : Auteur(s): Spiridonov, V.A.

10. Estimation of natural mortality for the Patagonian toothfish at Heard and McDonald Islands using catch-at-age and aged mark-recapture data from the main trawl ground

    obtained using proportions-at-length and fishery- and year-specific age–length keys (ALKs) for years 1998 ... :  Attempts to estimate natural mortality, as a single constant M, simultaneously with other model parameters ... in R, based on alternative ordinary differential equations (ODE) for within-year population dynamics ... fishery, the CCODE model gave a well-behaved profile for the log-likelihood with the corresponding ... populations combined with multi-year catch-at-age and aged mark-recapture data by Candy (2011). These sim ... within 60 days of release or recaptures within the same within-year season of early-season (1 December ... year fished, q, was increased from 0.75 to 0.80 with a similar value for the MLE of M compared to that ... fishery- and year-specific age–length keys (ALKs) for years 1998 to 2008. A large proportion of the ...

    Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 29–45 : Auteur(s): Candy, S.G., D.C. Welsford, T. Lamb, J.J. Verdouw and J.J. Hutchins

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