Résultats de la recherche
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A simulation study of krill fishing by an individual Japanese trawler
krill trawler over a half-month period. It is based on an underlying krill distribution model whose ... Paper Title: A simulation study of krill fishing by an individual Japanese trawler Abstract ... / Description: A model is set up for the operation (which includes both searching and fishing) of a Japanese ... is compared with (and partially tuned to) statistics for a sample of data from the commercial fishery ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 1–108 : Auteur(s): Butterworth, D.S.
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An assessment of toothfish in Subarea 48.3 using CASAL
Paper Title: An assessment of toothfish in Subarea 48.3 using CASAL Abstract / Description: This ... paper presents an assessment of the stock of toothfish around South Georgia (Subarea 48.3) using the ... dynamics is explored using Markov Chain Monte Carlo (MCMC) methods; methods for fast approximations to the ... , long-term yield calculations were undertaken, given the CCAMLR decision rules, for five main assessment ... for the later period. The two estimated selectivity curves are shown in Figure 2. The year-class ... and CPUE data are poorer for the one-fleet model than those seen in the two- fleet model. 71 An ... are undoubtedly rather high for an animal with the longevity of toothfish and its relatively low ... years refer to the fishing season that started in December prior to the year quoted. For example, year ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 65–95 : Auteur(s): Hillary, R.M., G.P. Kirkwood and D.J. Agnew
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An overview of Southern Ocean zooplankton data: abundance, biomass, feeding and functional relationships (submitted to the 2008 Joint CCAMLR-IWC Workshop)
for differences in the extent of identification of early larval stages. Likewise, the time of year ... an enormous amount of data on Southern Ocean (SO) zooplankton, mostly on their distribution with a ... overview is provided of the diversity and basic biology of SO zooplankton, with an emphasis on abundance ... Paper Title: An overview of Southern Ocean zooplankton data: abundance, biomass, feeding and ... one-half of those above. A change in the view of SO copepods in the last 20 years has followed an ... , with low energetic costs and an effective mechanism for feeding unselec- tively at low food ... estimated for South Georgia (Watts and Tarling, 2012). Pteropods Pteropods are gastropod molluscs with an ... material, values increased by 30% to allow for tissue loss due to formalin preservation Ward and Shreeve ...
Science Journal Paper : CCAMLR Science, Volume 19 (CCAMLR Science, Volume 19) : 171–218 : Auteur(s): A. Atkinson, P. Ward, B.P.V. Hunt, E.A. Pakhomov and G.W. Hosie
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Can we use discriminant function analysis to sex penguins prior to calculating an index of a morphometric characteristic?
Paper Title: Can we use discriminant function analysis to sex penguins prior to calculating an ... , morphometric characteristics have separate distributions for males and females, and these often overlap. Whilst ... certain proportion of birds. Two overlapping normal distributions are used to show that there is a ... difference between the real mean characteristic for a sex, and the apparent mean derived by sexing the birds ... to combine males and females for the calculation of an index. This paper evaluates the suggestion ... the success of the discriminant function for two characteristics described by Kerry et al. (1991) of ... changes may be masked. For instance, if all females are sampled one year, and all males the next, then ... amount of difference between two means that could be due to sex ratio 'sampling' alone. For example ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 259–272 : Auteur(s): Agnew, D.J.
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An assessment of the mackerel icefish (Champsocephalus gunnari) off Heard Island
tonnes for the Heard Plateau and 18 tonnes for Sliell Bank. An assessment based on the results of a ... populations on the Heard Plateau are sufficiently different from those on Shell Bank for them to be managed ... survey conducted at the end of the 1997 fishing season would allow for a catch limit on the Heard Plateau ... Paper Title: An assessment of the mackerel icefish (Champsocephalus gunnari) off Heard Island ... for at least two years. This suggests that a form of management strategy based on recent abundance ... tonnes for Sliell Bank. An assessment based on the results of a survey conducted at the end of the 1997 ... , which means that they are based on a constant catch over a 20-year period, and as such they can be ... years from the two abundant cohorts of 1 500 tonnes, comprising 900 tonnes in the first year and 600 ...
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
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An index of per capita recruitment
Paper Title: An index of per capita recruitment Abstract / Description: An index of per capita ... recruitment (PCR) is proposed such that where R 1 is the proportion of age-l animals sampled in year y and M ... in mortality and reduction in the proportion of age-l spawners. Introducing year-to-year random ... underestimate recruits per spawner by 30% if reasonable assumptions are made regarding the variability of ... for Ml and c, and a is set to 0.0, PCR underestimates R/S by an average of approximately 30 ... appearing as a large mode at 20 to 30 mm length and in subsequent years as progressively longer length ... years except for the moderate year class of 1990/91. The non-linear transformation of R1 to PCR ... ). These hypotheses are supported by evidence for multi- year coherence among physical and biological ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 179–196 : Auteur(s): Hewitt, R
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Calibration of an acoustic echo-integration system in a deep tank, with system gain comparisons over standard sphere material, water temperature and time
outlines the theory and procedures for calibrating an echo integration acoustic system with a standard ... Paper Title: Calibration of an acoustic echo-integration system in a deep tank, with system gain ... sphere. It presents the results of an extensive calibration of a Simrad EK500 scientific echosounder with ... an echo integration acoustic survey. To minimise these effects, the TS gain and SA gain parameters ... procedures for calibrating an echo integration acoustic system with a standard sphere. It presents the ... ), target depth (0.8 to 7.5 m), and time (pre- and post-cruise). The calibration was in preparation for an ... . Assuming an accuracy of 0.5 dB for calibration with a standard target, the error of estimating mean target ... provide less troubling results. For instance, if the ES 120 transducer is used, an angle sensitivity of ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 127–144 : Auteur(s): Demer, D.A. and R.P. Hewitt
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An assessment of the merits of length and weight measurements of Antarctic krill Euphausia superba
an example given to indicate the potential such variation has for introducing error into estimates of ... biomass based on acoustic data. An alternative approach is examined in which length and additional ... Paper Title: An assessment of the merits of length and weight measurements of Antarctic krill ... stage and moult stage. The range of coefficients and exponents for these relationships are examined and ... potential such variation has for introducing error into estimates of biomass based on acoustic data. An ... coefficients and exponents for these relationships are examined and an example given to indicate the ... - 371 - SC-CAMLR-VI/BG/33 AN ASSESSMENT OF THE MERITS ... prediction. Surprisingly, the stage of the moult cycle of the animal has little effect upon length-weight ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 371-373 : Auteur(s): Morris D.J., J.L. Watkins, C. Ricketts, F. Buchholz, and J. Priddle
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Problems of population age structure determination of Euphausia superba Dana using an example from the Antarctic Peninsula area and adjacent waters
examines the size structure of populations of E. superba in relation to their habitat, on the basis of an ... an example from the Antarctic Peninsula area and adjacent waters Abstract / Description: This paper ... other biotic and abiotic factors. Possibilities are outlined for the elucidation of the problem of the ... , data are cited on the growth rates of krill in relation to feeding conditions, temperature factors and ... populations of E. superba in relation to their habitat, on the basis of an analysis of data collected by the ... STRUCTURE DETERMINATION OF EUPHAUSIA SUPERBA DANA USING AN EXAMPLE FROM THE ANTARCTIC PENINSULA AREA AND ... abiotic factors. Possibilities are outlined for the elucidation of the problem of the age and size ... ~, paSMepaMH OKOJIO .20 MM, O@JIH oOHapy- *eH@ B cpeBpane H MapTe 1981 r B HeTpaccpopMHpOBaHH@x Bo~ax MO ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 227-270 : Auteur(s): Spiridonov, V.A.
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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)
the southern Polar Front area (the area to the north of South Georgia is used as an example) Abstract ... concentrations throughout the year. Results of surveys showed that the distribution and behaviour of E ... months were noted as transitional for parameters of vertical distribution and density of fish ... year is related to parameters of spatial and vertical distribution of fish. Interannual variability of ... in this area on board RV Vozrozhdenie. They worked for almost two years from October 1987 to June ... SOUTH GEORGIA IS USED AS AN EXAMPLE) A.N. Kozlov, K.V. Shust and A.V. Zemsky* Abstract From 1987 ... concentrations throughout the year. Results of surveys showed that the distribution and behaviour of E ... and autumn months were noted as transitional for parameters of vertical distribution and density of ...
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