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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 ... 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 ... for the later period. The two estimated selectivity curves are shown in Figure 2. The year-class ...
Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 65–95 : Autor(es): Hillary, R.M., G.P. Kirkwood and D.J. Agnew
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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 : Autor(es): de la Mare, W.K., R. Williams and A.J. Constable
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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 ... characteristics (such as the CEMP characteristic AI, "weight on arrival") have separate distributions for males ... to combine males and females for the calculation of an index. This paper evaluates the suggestion ... characteristicistics in order to monitor body weight. From now on, then, I make reference only to an undescribed ... acceptable for all practical purposes. This means that the insistence on completely accurate sexing is not ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 259–272 : Autor(es): Agnew, D.J.
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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 ... reproductive success and the factors postulated to affect it. The formulation of PCR is based on the ... assumptions that: (i) post-recruit mortality does not vary over age or between years; (ii) 100% of age-l ... years, and when all age-l animals spawn. These conclusions are insensitive to changes in the shape of ... appearing as a large mode at 20 to 30 mm length and in subsequent years as progressively longer length ... for Ml and c, and a is set to 0.0, PCR underestimates R/S by an average of approximately 30 ... years except for the moderate year class of 1990/91. The non-linear transformation of R1 to PCR ... converted to a series of PCR indices for Antarctic krill. DERIVATION OF AN INDEX OF PCR The PCR index ...
Science Journal Paper : CCAMLR Science, Volume 7 (CCAMLR Science, Volume 7) : 179–196 : Autor(es): 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 ... dB on the TS of one sphere. 3. EQUIPMENT AND PROCEDURES An extensive calibration was performed on ... ), target depth (0.8 to 7.5 m), and time (pre- and post-cruise). The calibration was in preparation for an ... ) calculated the effect of a ±0.1 mm variation in sphere diameter to be ±0.02 dB on TS. This corresponds to an ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 127–144 : Autor(es): 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 ... predictors of wet or dry weight in Antarctic krill Euphausia superba Dana are standardised with new data on ... 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 ... Antarctic krill Euphausia superba Dana are standardised with new data on the relationships of three length ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 371-373 : Autor(es): 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 ... , data are cited on the growth rates of krill in relation to feeding conditions, temperature factors and ... other biotic and abiotic factors. Possibilities are outlined for the elucidation of the problem of the ... 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 ... . Hypotheses are formulated regarding the age and growth of E. superba; in addition, data are cited on the ... abiotic factors. Possibilities are outlined for the elucidation of the problem of the age and size ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 227-270 : Autor(es): 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 ... months were noted as transitional for parameters of vertical distribution and density of fish ... 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 ... 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 ... and autumn months were noted as transitional for parameters of vertical distribution and density of ... concentrations. Over many years, the basic biological features, distribution patterns, areas, timing and ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 337–367 : Autor(es): Kozlov, A.N., K.V. Shust and A.V. Zemsky
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New data on spawning, hatching and growth of Champsocephalus gunnari on the shelf of the Kerguelen Islands
Paper Title: New data on spawning, hatching and growth of Champsocephalus gunnari on the shelf of ... the Kerguelen Islands Abstract / Description: Combined studies on the inner and outer northeastern ... part of the Kerguelen shelf during the 1989/90 to 1993/94 period provide new information on the stock ... variations in abundance have been observed. During the sampling period the 1988 cohort was dominant on the ... taken both by bottom trawl (30' duration; 12 to 20 stations, depending on weather and bottom ... - - - ' , ' i " " " ' " " " ' I " " 0 10 20 30 Total length (cm) Figure 2: Quarterly LFDs for C. gunnari ... for successive cohorts (Table 3). Daily growth increments are available for the first two years of ... shelf as a nursery zone for one to two years, then migrate to the outer shelf. This is shown for each ...
Science Journal Paper : CCAMLR Science, Volume 2 (CCAMLR Science, Volume 2) : 21–34 : Autor(es): Duhamel, G
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Note on estimating krill abundance from acoustic data on individual aggregations
Paper Title: Note on estimating krill abundance from acoustic data on individual aggregations ... differences of the two approaches are highlighted. It is concluded that the echo-integration approach is ... superior for the estimation of regional krill abundance and its variance since it is easier to apply ... WG-KRILL-91/20 NOTE ON ESTIMATING KRILL ABUNDANCE FROM ... for each ESDU is not available, but there is information on the mean intensity of echoes returned by ... . An estimator is available for randomly distributed aggregations (Lucas and Seber, 1977), but in ... little sense in collecting acoustic data on individual aggregations, although naturally, for studies on ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 219–223 : Autor(es): Hampton, I. and D.G.M. Miller