Résultats de la recherche
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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
posteriori estimation of the error made when calculating the biomass, and for survey planning on the basis of ... is determined as the product of the average density for the region under examination and the area of ... this region. For a hydroacoustic survey, the anisotropy parameters correlation radius along transects ... (sections) serve as survey parameters. The relationships described here can be used in practice for both a ... survey occupies an intermediate position between the two abovedeaoribed cases: now I'z.I. «f<. , If, z ... mentioned, in practice there usually takes place an inverse relation between deterministic and random ... estimating biomass. 4. Conclusion Results mentioned here can be used in practice both for a posteriori ... the error made when calculating the biomass, and for survey planning on the basis of a priori ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 213-228 : Auteur(s): Kizner, Z.I.
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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
abundant 1986 and 1987 year-classes and with a diminished rate of emigration of krill of these year-classes ... LogL Two types of trawls were used for kriU sampling: an Isaacs-Kidd midwater trawl with a 6.0 sq. m ... previous period (1986 to 1988) and for an increase in krill biomass in the area. The data in Table 2 ... 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 ...
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
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Food and feeding of the mackerel icefish (Champsocephalus gunnari) around South Georgia in January/February 1991
stomachs and the feeding intensity were uncommonly low in a period when energy rich food is needed for the ... to 3 877) and an unrepresentative coverage of the shelf from year to year. However, two pairs of ... needed for the final maturation of the gonads. Resume La composition du regime alimentaire et ... ). An unusually high proportion of sexually mature fish showed no signs of the gonad development ... in the face of food shortage an adaptative strategy is to sacrifice egg production and maintain body ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 15–23 : Auteur(s): Kock, K.-H., I. Everson, S. Campbell, G. Parkes, Z. Cielniaszek and J. Szlakowski
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Modelling krill recruitment
Paper Title: Modelling krill recruitment Abstract / Description: A method is developed for using ... for generating families of recruitment functions which are consistent with the statistical uncertainty ... to Justin Cooke and an anonymous reviewer for (30) helpful comments on the draft text of the paper ... parameter we need to fix for the krill model is the rate of natural mortality (M) . In an unexploited ... the quotient of two random variables, and hence the delta method expansion for the variance of (2 ... model is exercised for n years without exploitation prior to calculating the mean unexploited ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 49–54 : Auteur(s): W.K. de la Mare
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CPUEs, body length and greenness of Antarctic krill during 1987/88 season in the fishing ground north of Livingston Island
there was a marked change in two kinds of CPUEs, body length and greenness of krill during the fishing ... season, these parameters were examined for each 10-day period of the Japanese krill fishery in the ... from these data. The percentages of “Egui” as an indicator of greenness of krill were too variable ... among trawlers to be an objective indicator at present. File: 17-Endo-and-Ichii.pdf ... integrator. Two kinds of CPUEs, body length and greenness of krill were examined for each 10-day period ... Livingston Island as the area between 59°30'W and 61°30'W and between 61°30'S and 62°30'S (Figure 1). Two ... 50 40 l- 30 3 o l- ---J: U l- -< U 20 10 o E M JAN L E M FEB L E 10-DAY ... trawler for each 10-day period from January to March 1988. 333 20 10 o F ~~ w ~ <.::J a: f ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 323–338 : Auteur(s): Endo, Y. and T. Ichii
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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 ... to 2004/05 fishing seasons on board the autoliner San Aotea II have been analysed. Results of this ... study indicate measurable differences in a number of indices from toothfish found on the Ross shelf ... proper, as distinct from those sampled on the more isolated seamounts and features to the north. These ... Fulton’s condition index (K) has been calculated for the five sampling seasons. This index assumes an ... and southern data used in this paper were made using an unequal variances two-sample T-test ... . Table 4 shows the overall ratio of females to the total catch-weighted sample for each year from each ... significant for each sex (two-tail P < 0.001). Due to patterns of sampling forced by ice- clearance patterns ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 27–45 : Auteur(s): Fenaughty, J.M
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Quantifying vessel performance in the CCAMLR tagging program: spatially and temporally controlled measures of tag-detection rates
an integrated stock assessment. Previous attempts to assess the relative reliability of vessels in ... detecting tagged fish have been inconclusive due to low numbers of recaptures after controlling for spatial ... controlling for spatial and temporal variables using a case-control study design, and uses this method to ... develop relative indices for detection rate performance for vessels involved in the Antarctic toothfish ... parameters. For example, under- estimating the tag-detection rate of the fleet will result in an ... to the annual fishing trips for each vessel. methods Initially, the case is defined as an ... for Subareas 88.1 and 88.2 by vessel for a space window of 20 km and time window of one season ... lower, the relative values for the indices were unchanged; hence 20 km was chosen as the balance ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 73–80 : Auteur(s): Mormede, S. and A. Dunn
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Physical oceanographic setting of the Siedlecki January 1987, South Shetland Island data set
): an intrusive layer of Pacific derived relatively warm-salty water near 300 meters depth and deeper ... speculated that mixing of Weddell and Pacific waters near the tip of the Antarctic Peninsula is an important ... between these two large scale water mass or stratification regimes, is an order 100 km wide zone of very ... for an ideal area for study of the relationship of krill to its environment. ACKNOWLEDGEI'vENTS ... of the Scotia front) over the continental slope. Labelled on figure 8 are two such features: "A ... , represented by station 223) and stations representing various stages on mixing, for the blends marked A and B ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 161-184 : Auteur(s): Gordon, A.L.
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Characteristics of krill aggregations in the South Sandwich Islands subarea in January–February 2000
spatial distribution patterns of krill aggregations on the horizontal and vertical distribution of krill ... 20 00 19 83 19 90 Po te nt ia l F is hi ng G ro un d s (J an ua ry ... Subarea 48.4 CONCLUSION Acoustic surveys of krill aggregations are impor- tant for an understanding of ... 59°S 60°S 61°S 200 g m-2 20 g m-2 2 g m-2 0.2 g m-2 31°W 30°W 29°W ... 20.00 30.00 40.00 50.00 3 9 15 21 27 fre qu en cy ,% Fr eq ue nc y (% ) 50 40 30 20 10 ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 145–164 : Auteur(s): Kasatkina, S.M., A.P. Malyshko, V.N. Shnar and O.A. Berezhinsky
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Results of fish stock assessment survey, South Georgia, December 1987 - January 1988
for any subsampling on deck or in the laboratory, and was standardized to 30 minute tows. 21 3 ... . There is also an indication of decreasing size with increasing depth for this species, whereas all ... temporary, because the following two year classes are small (Figure 3b). As members of this strong year ... expects the data to have been corrected to a standard" PRINT tow of 30 min. at 3.5 knots, and for any ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part II) : 19-52 : Auteur(s): McKenna, Jr., J.E. and S.B. Saila