Résultats de la recherche

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

   swann depth (metres) 42 29 41 24 29 25 30 21 cr, swann depth 13 20 13 8 10 14 16 8 Mean swann ... 47 59 30 23 20 29 17 cr, mean swann length (metres) 15 16 19 7 10 7 20 4 Swann density field in ... by a trawl bag of 20 mm twine. This protects the trawl bag from mechanical damage. Features of ... catchability no less than ~ x(P) = 0.1, it would be necessary to carry out over the study area 20 hauls with a ...

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

2. Fish distribution and biomass in the Heard Island zone (Division 58.5.2)

   distribution, abundance and biology of the most important species, covering a number of years and seasons. Five ... gunnari, but total abundance varied greatly between years. Channichthys rhinoceratus has a similar ... CCAMLR Science, Vol. 2 (1995): 1-20 FISH DISTRIBUTION ... following changes were Each haul was for 30 minutes duration on the made with respect to summer 1992 ... of high density of C. gunnari and L. squamifuons; Autumn 1990 3 (2) 6 (6) 16 (16) 24 (20 ... variations were not in phase with each other. Duhamel (1991a) has demonstrated a three-year cycle of ...

   Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 1–20 : Auteur(s): Williams, R. and W.K. de la Mare

3. 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 ... concentrations were situated near the bottom or at 10 to 30 m above the bottom during daylight hours (09:00 to ... -18 18-20 20-22 22-24 Apri11983 BMRT Bottom 1.2 4.6 2.6 6.0 11.8 11.1 13.7 8.9 4.1 8.8 1.9 1.7 ... 7 6 5 4 3 2 1 0 2 4 6 8 10 12 14 16 18 20 22 24 Time of day, h Figure 1: Bottom ... , ~ __ J ~0~~~~~--~~~~----~/~~~~ t/h 10 8 6 4 2 B ---- 0 2. 4 6 8 10 12 14 16 15 20 22 ...

   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

4. Distribution and size of Antarctic krill (Euphausia superba Dana) in Polish commercial catches taken in the Atlantic sector of the Southern Ocean from 1997 to 1999

   (% ) Elephant South Shetland 1999 0 5 10 15 20 25 30 35 40 45 50 55 60 Length (mm) Fr eq ue nc y ... , therefore their results do not refl ect the year-round structure of krill concentrations. Additionally ... in one concentration can be as dense as 30 000 specimens per m-3 of water (Hamner et al., 1983 ... different areas of the Atlantic sector that yield the best commercial catches of krill. Each year, the ...

   Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 83–105 : Auteur(s): Jackowski, E

5. Seasonal and inter-annual variability in the distribution of Electrona carlsbergi in the southern Polar Front area (the area to the north of South Georgia is used as an example)

   concentrations throughout the year. Results of surveys showed that the distribution and behaviour of E ... year is related to parameters of spatial and vertical distribution of fish. Interannual variability of ... concentrations throughout the year. Results of surveys showed that the distribution and behaviour of E ... variability during the year is related to parameters of spatial and vertical distribution of fish ... of the PFZ at various times of the year (rate of warming of the surface layer, rate of ... the southern border of the PFZ between 40° and 36°W, 30° and 25°W and 49° and 53°S (Figures 1 to 5) E ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 337–367 : Auteur(s): Kozlov, A.N., K.V. Shust and A.V. Zemsky

6. Review of length-weight relationships for Antarctic krill

   the same weight. The situation changes throughout the year, i.e., during the annual maturity cycle ... indicate the timing of spawning varies from year to year. The seasonal variation in krill weight clearly ... Maturity Stages Several 0.00056 3.62 24-58 30/mm Chekunova and months Rynkova (1974) Jan/March 0.00229 ... 3.35 22-42** 49 mostly adolescent Clarke (1976) April 0.0018 3.3436 20-61 1085 spent Sahrhage (1978 ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 145–155 : Auteur(s): Siegel, V.

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

   respectively. The effects of a constant catch level (in tonnes) over a 20-year period were evaluated. The ... , which means that they are based on a constant catch over a 20-year period, and as such they can be ... , 4.44 5001 5001 1 0 20 0.2 Trial 3 2 6 5 360 0.3-0.64 3 5 .O 1E-05 All year ... 5001 5001 1 0 20 0.2 Trial 4 2 6 5 360 0.3-0.64 2 5 .O 1E-05 All year 0.57 ...

   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

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

   ) 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 ... fishing regimes. This model considers a year of 360 days, consisting of 12 monthly (30-day) intervals ... -exploitation spawning biomass at some time over the 20-year projection period is equal to 10%. + Values in ...

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

9. Observations on haul-out patterns and trends in the breeding populations of southern elephant seal at Península Valdés (Patagonia) and Stranger Point (25 de Mayo - King George I.)

   °30' W). The other place was located at Peninsula Valdes (patagonia) (1981-1984). Censuses were ... area and it was used every year to collect the information. The maximum number of females at ... corresponding to 27/10, rank ± 3 to Stranger Point and to 30/9, rank ± 5 to Peninsula Valdes. Besides, the ... both places it was independently observed, from year to year, the duration and the synchronization ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 453-463 : Auteur(s): Vergani, D.F., M.N. Lewis and Z.B. Stanganelli

10. 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 ... . The predicted age structure, dominated in recent years by the 1987 year-class (1 year olds in 1988 ... recent years dominated by the year class spawned in late 1985/86, recruiting as 1 year olds in 1987/88 ... produced much lower estimates of abundance in the most recent years than MAFF5. The picture of year class ... year. Similarly in other years the assumed commercial age distribution will depend upon where the ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 49–79 : Auteur(s): Parkes, G.

Pages