Résultats de la recherche

1. The status of krill (Euphausia superba DANA) resources in CCAMLR Statistical Divisions 58.4.2 and 58.4.3 from 1988 to 1990. Results of acoustic surveys

   paper. It was found that the increase in krill biomass observed in the area in 1990 is linked with the ... abundant 1986 and 1987 year-classes and with a diminished rate of emigration of krill of these year-classes ... in krill biomass observed in the area in 1990 is linked with the abundant 1986 and 1987 year-classes ... and with a diminished rate of emigration of krill of these year-classes from the area in 1989/1990 ... bridge device with a working frequency of 136 kHz. A copper ball, 26 mm in diameter, was used to ... LogL Two types of trawls were used for kriU sampling: an Isaacs-Kidd midwater trawl with a 6.0 sq. m ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 163–173 : Auteur(s): Bibik, V.A. and V.N. Yakovlev

2. Age determination of Champsocephalus gunnari Lönnberg, 1905 (Channichthyidae) taken in the South Georgia area in 1990

   9+ were present in catches. Two peaks in size composition correspond with fish of the 1987 and 1985 ... /86 year classes. The first small peak corresponds with the strong 1988 year class. File:  17 ... size composition correspond with fish of the 1987 and 1985/86 year classes. The first small peak ... corresponds with the strong 1988 year class. Re.sume En janvier/fevrier 1990, la Grande-Bretagne et ... , and 31-33 cm with the maximum being in the second size group (Hill Cove) while in February they were ... 16-18,24-26 and 30-34 cm with the maximums being in the second and third size groups (Akademik ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 285–293 : Auteur(s): Kochkin, P.N.

3. Genetic variations and population structure of krill from the Prydz Bay region of Antarctic waters

   consistent with the hypothesis that all samples were derived from a single breeding population of krill. The ... results of this study agree closely with genetic data from other studies on krill in the Atlantic sector ... result consistent with the hypothesis that all samples were derived from a single breeding population ... of krill. The results of this study agree closely with genetic data from other studies on krill in ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 271-273 : Auteur(s): MacDonald, C.M., R. Williams and M. Adams

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

   in areas surveyed. The task of detecting surface concentrations of krill can be solved with the help ... FIBEX program. It was shown that the hydroacoustic device Simrad SK-120, with TVG switched off, is ... detecting surface concentrations of krill can be solved with the help of towed acoustic antennae. The ... shown that the hydroacoustic device Simrad SK-120, with TVG switched off, is capable of registering ... eddies, with certain oxygen, silicon, phosphorus concentrations and other hydrological conditions. Such ... . With the onset of darkness, the groups and aggregations usually come closer to the surface and ...

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

5. Estimating krill recruitment and its variability

   and above) of 0.339 with a standard deviation (SD) of 0.100. The corresponding result for recruitment ... nine surveys is 0.552 with a standard deviation of 0.074. A number of the assumptions needed for ... number of krill aged one year to the number of krill aged one year and above) of 0.339 with a standard ... two-year-old krill to the number aged two and above) from nine surveys is 0.552 with a standard ... . The problem with krill is that there is no reliable method of direct age determination. One indirect ... with the length frequency distributions of each age class. It is clear that there is little prospect ...

   Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 55–69 : Auteur(s): de la Mare, W.K

6. Trawl bag selectivity in the Champsocephalus gunnari fishery

   were carried out in June 1990 in the South Georgia area concurrently with trawl surveys as part of the ... and the selectivity factor was 3.10 for a mesh size of 80 mm. Comparison of these results with results ... 1990 in the South Georgia area concurrently with trawl surveys as part of the main biological and ... was 3.10 for a mesh size of 80 mm. Comparison of these results with results from previous years ... BMRT Anchar in June 1990 in the South Georgia area concurrently with trawl surveys within the main ... trawler with a displacement of 2 120 tonnes and a main engine of 2 000 hp. Fishing gear was a standard ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 295–312 : Auteur(s): Bidenko, V.G. and I.G. Istomin

7. Measurements of differences in the target strength of Antarctic krill (Euphausia superba) swarms at 38 kHz and 120 kHz

   in average target strength at these two frequencies. The results are in good agreement with recent ... experimental work on the target strength of encaged E. superba at 38 and 120 kHz but are in major conflict with ... are in good agreement with recent experimental work on the target strength of encaged E. superba at ... 38 and 120 kHz but are in major conflict with the 120 kHz - to - 50 kHz target strength conversion ... kHz, with 120 kHz being probably the most common frequency (Miller and Hampton, 1989). Knowledge of ... target strengths at 120 kHz were some dB higher than at 38 kHz, in general agreement with predictions ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 75–86 : Auteur(s): Hampton, I.

8. Statistical power to detect changes in growth rates of Antarctic fur seal pups

   changes (between years) in pup growth rates, the loss of power associated with obtaining weight samples on ... detect a 17% change in the growth rate with a 10% chance of committing Type 1 or Type 2 errors. If only ... ) in pup growth rates, the loss of power associated with obtaining weight samples on only three dates ... % change in the growth rate with a 10% chance of committing Type 1 or Type 2 errors. If only three samples ... loss of power associated with obtaining only three weight samples, and possible means of increasing ... follows: (i) A simulated data set, with a specified number and spacing of sampling dates and number of ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 399–409 : Auteur(s): Boveng, P., J.L. Bengtson and M.E. Goebel

9. Attribtuion of acoustic echoes to squid in the south Atlantic

   and Loligo gahi), but a third species, sometimes caught as a by-catch with Illex argent inus , the ... al., 1996), and recent data from a new fishery developing at South Georgia (Gonzalez and Rodhouse ... acoustic targets that could be attributed to the haul. No other species were caught with the squid which ... the area, also described here, only small numbers of squid were caught; these did not coincide with ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 259–271 : Auteur(s): Goss, C., P. Rodhouse, J.L. Watkins and A.S. Brierley

10. Can we use discriminant function analysis to sex penguins prior to calculating an index of a morphometric characteristic?

    birds with greater than 80% success, the difference between the true and apparent mean is likely to be ... discriminant function with greater than 80% success may be used to derive statistically robust estimates of ... discriminant functions are able to correctly determine the sex of birds with greater than 80% success, the ... sampled. Therefore, under most normal sampling regimes a discriminant function with greater than 80 ... birds. Concern was expressed that it may be necessary to know the sex of birds with absolute accuracy ... males and females with a certain error, is this likely to give us a false estimate of the ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 259–272 : Auteur(s): Agnew, D.J.

Pages