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Brief comments on the simulation study made by Professor Butterworth on krill fishing by an individual Japanese trawler
values used for the minimum catch rate per overall elapsed time. It is suggested that an improvement in ... fishing by an individual Japanese trawler Abstract / Description: In this paper, three essential ... questions are raised concerning the simulation study of the Japanese krill fishery carried out by ... being produced, and the demand for each product varies substantially from one season to the next ... , the demand for each product can be seen to change from year to year. We do, therefore, agree with him ... MADE BY PROF. BUTTERWORTH ON KRILL FISHING BY AN INDIVIDUAL JAPANESE TRAWLER T. Ichii and Y. Endo ... Abstract In this paper, three essential questions are raised concerning the simulation study of the ... SSTs are markedly dependent upon the type of products being produced, and the demand for each product ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 347–350 : Autor(es): Ichii, T. and Y. Endo
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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 ... 18 to 20 December, 1988 676 11278 9 - 80 16.7 * density range * * mean value 343 w t _ 40 ... WG-FSA-90/35 SEASONAL AND INTER· ANNUAL VARIABILITY IN ... SOUTH GEORGIA IS USED AS AN EXAMPLE) A.N. Kozlov, K.V. Shust and A.V. Zemsky* Abstract From 1987 ...
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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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 : Autor(es): Demer, D.A. and R.P. Hewitt
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A simulation study of krill fishing by an individual Japanese trawler
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 ... krill trawler over a half-month period. It is based on an underlying krill distribution model whose ... 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 : Autor(es): Butterworth, D.S.
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Notes on the use of virtual population analysis for stock assessment of the mackerel icefish, Champsocephalus gunnari (Lönnberg, 1906) in Subarea 48.3 for the 1990/91 and 1991/92 seasons
techniques, from 1991 back to 1977. The predicted age structure, dominated in recent years by the 1987 year ... Paper Title: Notes on the use of virtual population analysis for stock assessment of the mackerel ... icefish, Champsocephalus gunnari (Lönnberg, 1906) in Subarea 48.3 for the 1990/91 and 1991/92 seasons ... CPUE indices for tuning. According to the VPA the population in 1991/92 was composed of a large ... at age a over all years. For years with survey indices only: and for years with CPUE indices ... produce credible results for the most recent years. There may also be problems with the catch at age ... data itself. The tendency for C. gunnari in years of high abundance to aggregate in age specific ... . The predicted age structure, dominated in recent years by the 1987 year-class (1 year olds in 1988 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 49–79 : Autor(es): Parkes, G.
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Factors that may influence the accuracy of abundance estimates from CCAMLR tag-recapture programs for Dissostichus spp. and best practice for addressing bias
spatially explicit modelling approaches is also an important next step for Dissostichus spp. assessments ... -recapture programs for Dissostichus spp. and best practice for addressing bias Abstract / Description: The ... Lincoln-Petersen equation, the simplest form of an abundance estimator using tag-recapture data, was used ... account for their effects in stock assessments for Dissostichus spp. are also summarised. In nearly all ... (see review by Polacheck et al., 2010). For exam- ple, stock assessment model frameworks such as CASAL ... = ´ . (2) Deriving an accurate value for N using this esti- mator is based on a variety of assumptions ... years of standardised tags and increasingly sophis- ticated methods for data grooming and matching tags ... ; SC-CAMLR, 2011a, 2011b). In inte- grated assessments for South Georgia and the Ross Sea, an estimate ...
Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 63–72 : Autor(es): Welsford, D.C. and P.E. Ziegler
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Alternative methods for determining subarea or local area catch limits for krill in Statistical Area 48
current fishing patterns; and (vi) the potential for delay in implementing the alternative. An alternative ... Paper Title: Alternative methods for determining subarea or local area catch limits for krill in ... precautionary catch limit on krill (Euphausia superba) in Statistical Area 48. The measure also implies an ... relationships between krill and their predators are explicitly considered and the potential for delayed ... single year. Then, for the following two years, that subarea would be closed to fishing. For example, if ... patterns; and (vi) the potential for delay in implementing the alternative. An alternative is less likely ... not an acceptable, long-term strategy for managing the krill fishery (SC-CAMLR, 1991). Considering ... ecosystem. There will be an initial cost to collect the data necessary for defining the impacts to ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 237–249 : Autor(es): Watters, G. and R.P. Hewitt
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Joinville–D’Urville Islands (Subarea 48.1) – a former fishing ground for the spiny icefish (Chaenodraco wilsoni), at the tip of the Antarctic Peninsula – revisited
Paper Title: Joinville–D’Urville Islands (Subarea 48.1) – a former fishing ground for the spiny ... depths of 149 to 282 m on 21 February 2002. Published and unpublished reports from fishing operations in ... , sparse, being restricted to the two seasons (1978/79 and 1979/80) when Polish and GDR vessels fished in ... the southern Scotia Arc region – a review and pro spects for future research. Rev. Fish Res. (in ... Joinville–D’Urville Islands for the fi rst time (Figure 1). The authors took this opportunity to review ... avail- able for two seasons, 1978/79 and 1979/80. Polish Kock et al. 4 and GDR vessels fi shed ... . Catches were variable between months, as can be seen from total catch fi gures pro- vided by month for ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 1–20 : Autor(es): Kock, K.-H., L. Pshenichnov, C.D. Jones, K. Shust, K.E. Skora and Zh.A. Frolkina
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Length-based assessment for mackerel icefish (Champsocephalus gunnari) at South Georgia
Paper Title: Length-based assessment for mackerel icefish (Champsocephalus gunnari) at South ... Georgia Abstract / Description: The current CCAMLR assessment method for mackerel icefish ... model (GYM) packages, which derives population numbers-at-age and projects these numbers forward under ... accurate identification of age cohorts from the survey data. In this paper a length-based approach is ... growth curve to estimate an appropriate density-at-age for the population. A bootstrap procedure is ... resultant two-year TAC), will be in a length- not an age-structured paradigm. In such a length-based ... pro- posed method as a new assessment procedure for this stock, a three-year comparison between the ... proposed method and the CMIX/GYM procedure was performed for the years 2006 to 2009. For each year, the ...
Science Journal Paper : CCAMLR Science, Volume 17 (CCAMLR Science, Volume 17) : 129–137 : Autor(es): Hillary, R.M., C.T.T. Edwards, R.E. Mitchell and D.J. Agnew
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A rationale for conservation areas within Antarctic waters
marine living resources’ (Article IX 2 (b)). In order to select meaningful boundaries for such areas ... Paper Title: A rationale for conservation areas within Antarctic waters Abstract / Description ... : The application of potential conservation measures listed in Article IX 2 of the Convention requires ... available, the following six potential conservation areas are proposed: 70°W- 15°W 15°W- 40°E 40°E- 90°E 90 ... " (Article IX 2 (b)). In order to select meaningful boundaries for such areas, first priority has been ... regions might suffice as an initial basis for a workable management regime, under the ecosystem ... ecological basis. AN ECOLOGICAL BASIS FOR DELINEATING CONSERVATION AREAS water circulation and ... krill within major gyres has led to an examination of samples for evidence of morphological or ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 513-535 : Autor(es): Chittleborough, R.G.