Результаты поиска

1. Analysis of haul data from the South Georgia krill fishery

   focused, operating in a limited area along the shelf edge on the northern coast of the island. Each day ... establish the time required for each phase of the fishing operation. The times associated with shooting and ... hauls were generally small, suggesting that little effort was spent searching for fishable swarms beyond ... existed between years, with 1995 being a better season than either 1994 or 1996. Aspects of mesoscale ... . For example, in 1994 two vessels from Japan left on the same day (vessels 2 and 3). Within their ... (nominally for June and July at 54O00'S; 35"30fW), a two-sample T-test based on 10 daylight hours (hours ... operating in different years. Most vessels from Poland and Ukraine operated for just a single year, while ... krill abundance and offer little but probably necessary for the future calculation information on how ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 9–30 : Автор(ы): Trathan, P.N., I. Everson, E.J. Murphy and G.B. Parkes

2. Detection and quantitative estimation of krill concentrations by hydroacoustic instruments

   instruments was established on board the research vessel Odissey during the international expedition under the ... transmitter frequency. Thus, echo sounders operating at comparatively low frequencies (20-30 kHz) are much ... of krill must depend strongly on frequency, especially at comparatively low frequencies (20-40 ... increase in frequency from 35 kHz to 250 kHz results in an almost two fold increase of 0. At frequencies ... towed antennae is their ease of calibration in the sea - an especially important feature for echo ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 123-139 : Автор(ы): Yudanov, K.I.

3. Analysis of results from demersal fish surveys at South Georgia, undertaken by the United Kingdom and the USSR, January and February 1990

   these large hauls were considered in the analysis. No ideal method was found for incorporating the large ... consist of one representative bottom trawl with the net fishing for 30 minutes on the bottom. The net ... on arrival at these positions the ground was found to be unsuitable for trawling. Alternative ... difficulty in the area to the southern part of the west shelf (squares 19 and 20). The reports of the two ... series. All hauls were intended to last for 30 minutes at a speed of 3 to 3.5 knots. Hauls were ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 223–254 : Автор(ы): (Report of a Joint UK/USSR Workshop, 23 to 27 July 1990)

4. Results of fish stock assessment survey, South Georgia region, November - December 1986

   described based on results of a stratified random bottom trawl survey. A total of 124 tows were undertaken ... . Biomass was estimated based on stratified swept-area calculations. Estimates of biomass of Notothenia ... rossii and Patagonotothen brevicauda guntheri were an order of magnitude lower than observe by Kock in ... than 1984/85, although not by an order of magnitude. Abundances of Notothenia gibberifrons and ... late 1970's in the South Georgia region has been documented for several years (e.g., Kock et al ... , with an overall mean length of 22.3 cm. Depending on the age-length schedule used, - 148 - modes ... m (on the west/southwest coast) and between 200-250 m (on the northeast coast). The two largest ... an order of magnitude lower than those based on a normal distribtion, 9 000 vs. 40 000 mt ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 143-183 : Автор(ы): Gabriel, W.L.

5. Biological characteristics of Antarctic fish stocks in the southern Scotia Arc region

   sexual maturity and length at first spawning in  Champsocephalus gunnari  was one year later on the ... from 1977/78 to 1989/90, and was in its heyday from 1977/78 to 1981/82. Except for Elephant Island, the ... , despite substantial catches in the first four years of the fishery and ample opportunity to sample these ... catches. The only scientific surveys of these stocks during these years were conducted by Germany in 1985 ... budgets for the entire year can be compiled. Emphasis should also be placed on studies on the macro ... for some years in the late 1980s. Since the early 1990s, the fishery was almost exclusively a ... between the tip of the wings times the distance travelled on the bottom during 30 minutes of trawling ... included for comparison (Table 2). Readers are also referred to an extensive collection of length-weight ...

   Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 1–41 : Автор(ы): Kock, K.-H., C.D. Jones and S. Wilhelms

6. A balanced model of the food web of the Ross Sea, Antarctica

   information on trophic links across all the major biota of the Ross Sea and tests for data consistency. The ... efficiency) and all groups together was 1.7%, and for diet fractions was 0.6%. Large but not implausible ... recent year (1990–2000). The focus of the model is on the role of Antarctic toothfish in the food web ... effects of the fishery for Antarctic toothfish (Dissostichus mawsoni). The model consolidates quantitative ... given predator based on an estimate of the quality of the available diet information for that predator ... quantitative information on trophic links across all the major biota of the Ross Sea and tests for data ... rate, growth efficiency) and all groups together was 1.7%, and for diet fractions was 0.6%. Large but ... . The model is an important step towards understand- ing the potential effects of the fishery for ...

   Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 1–31 : Автор(ы): Pinkerton, M.H., J.M. Bradford-Grieve and S.M. Hanchet

7. Analysis of krill trawling positions north of the South Shetland Islands (Antarctic Peninsula area), 1980/81–1999/2000

   effect on trawling positions. Ice conditions for recent fishing periods were also demonstrated to have an ... commercial krill trawling positions for the 1980/81 to 1999/2000 seasons in the area north of the South ... operations concentrated on the outer shelf in the early 1980s, along the shelf slope in the mid to late 1980s ... quality, such as salp abundance and the proportion of green krill, also seemed to have an increasing ... seemed to have an increasing effect on trawling positions. Ice conditions for recent fishing periods ... from fishing vessels, the reasons for changing fishing grounds in January of these years were either ... these two years showed unusual patterns. In 1990/91 most trawling positions were located from the ... . ACKNOWLEDGEMENTS We would like to thank Denzil Miller and Robin Ross for their critical comments 011 an earlier ...

   Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 25–36 : Автор(ы): Kawaguchi, S. and K. Segawa

8. Size at sexual maturity of Patagonian toothfish (Dissostichus eleginoides)

   / Description:  Analyses of size at sexual maturity were undertaken on samples of Patagonian toothfish ... (Dissostichus eleginoides) caught in the commercial fishery within Subarea 48.3. The results for 1996 indicate ... that L m50 occurs at 78.5 cm total length for male and 98.2 cm for female fish. In 1997 the results for ... male fish were essentially the same. For female fish there is evidence that in 1997 a significant ... errors) for 'spawners' based on an upper asymptote of l-propn. An estimate of population L,,,, (with ... leading to an enlarged ovary of about 20% of the fish total mass. Spawning occurs in the period July to ... 1996 and 1997 calendar years were prepared by the CCAMLR Data Manager and provided for the purpose ... fit logistic models with an additional parameter for non-response (usually called 'immunity' in the ...

   Science Journal Paper : CCAMLR Science, Volume 6 (CCAMLR Science, Volume 6) : 37–46 : Автор(ы): Everson, I. and A.W. Murray

9. Phytoplankton distribution in the mixed layer: implication to krill abundance

   Antarctic Ocean, we estimate the depth of the mixed layer and its turbulence intensity from an Ekman layer ... . However, the effect on the dynamics is vital, affecting the distribution of particles in the upper ocean ... extensively feed on phytoplankton. Boyd et al. (1984) estimate that they spend up to 30% of their total ... follow ( 2 ) (Gregg, 1987). Figure 2 shows the dissipation profile for UlO = 1, 5, 10 and 20 m sec-1 ... A is a constant of an order one. For the sake of simplicity we have used A= 1 . Therefore by ... (solid line) and the dissipation spectrum (dotted line) for N=0.001 rad S-1 and U10=1, 5, 10 and 20 m ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 331–356 : Автор(ы): Yamazaki, H. and T.R. Osborn

10. Preliminary model of krill fishery behaviour in Subarea 48.1

    Elephant Islands in alternate years would result in an average yearly catch similar to that at present ... during alternate years. File:  06agnew-marin.pdf ... Livingston and Elephant Islands in alternate years would result in an average yearly catch similar to that ... in Table 1 varied considerably, an approximate mean CV of 0.4 was used for all squares for these ... Elephant Islands, the two major fishing areas, in alternate years. Closures were modelled by ... two major fisheries in the area. Catches by a single Chilean vessel for February, the only month in ...

    Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 71–79 : Автор(ы): Agnew, D.J. and V.H. Marín

Страницы