Résultats de la recherche
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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 ... Paper Title: An assessment of the mackerel icefish (Champsocephalus gunnari) off Heard Island ... 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 ... an effective method for limiting the size and age of first capture for this species. Avoiding the ... mortality Tolerance (error) for determining fishing mortality in each year First age of maturity Date ... tonnes for Sliell Bank. An assessment based on the results of a survey conducted at the end of the 1997 ... will be shown below, have different age structures in the same year and appear to have differences in ...
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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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 : Auteur(s): 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 ... 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 ... 18 to 20 December, 1988 676 11278 9 - 80 16.7 * density range * * mean value 343 w t _ 40 ... in this area on board RV Vozrozhdenie. They worked for almost two years from October 1987 to June ... 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 : Auteur(s): 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 : Auteur(s): 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 : Auteur(s): Butterworth, D.S.
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A stock assessment model of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea Region incorporating multi-year mark-recapture data
Sea Region incorporating multi-year mark-recapture data Abstract / Description: An exploratory ... , and tagging has been an ongoing requirement for all vessels fishing in the fishery since 2004 ... model was developed for Antarctic toothfish in the Ross Sea region that incorporates multi-year release ... catch-at-age data. This is the first published stock assessment of toothfish in the Ross Sea region. It ... –2009. Mormede et al. 44 for each year and fishery in order to obtain scaled age frequencies of ... north fishery selectivity 10 20 30 40 50 Age Age Age ... Age Age Age 10 20 30 40 50 10 20 ... - estimates the weight of age data (see also Appen- dix A for further details). In an alternative run, the ...
Science Journal Paper : CCAMLR Science, Volume 21 (CCAMLR Science, Volume 21) : 39–62 : Auteur(s): Mormede, S., A. Dunn and S.M. Hanchet
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Evaluating the impact of multi-year research catch limits on overfished toothfish populations
Paper Title: Evaluating the impact of multi-year research catch limits on overfished toothfish ... additional fisheries removals for research purposes needs to be evaluated against the risk that such catches ... assessed in this study indicate that, where a stock has been depleted to at or below 20% of the median ... 30 tonnes per year for 5 years) to assumptions about selectivity (scenarios 7 to 9), size-at ... ) Parameter set 1 945 10% 0, 15, 30, 45, 60, 75, 90 As per Table 1 2 893 15% " " 3 841 20% " " 4 782 ... 25% " " 5 730 30% " " 6 677 35% " " 7 As per scenario 3 20% 30 As per Table 1 except age fully ... 60 75 90 1 10 27 28 29 30 31 32 34 2 15 21 22 24 25 26 27 28 3 20 17 17 19* 20 21 22 23 4 25 15 16 ...
Science Journal Paper : CCAMLR Science, Volume 18 (CCAMLR Science, Volume 18) : 47–55 : Auteur(s): Welsford, D.C
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Modelling catch and effort data using generalised linear models, the Tweedie distribution, random vessel effects and random stratum-by-year effects
. Further, the inclusion of an area stratum by fishing year interaction as an additional random effect in ... distribution, random vessel effects and random stratum-by-year effects Abstract / Description: The current ... standard method for modelling catch and effort data for Patagonian toothfish (Dissostichus eleginoides) for ... standardised CPUE estimates and their precision can be obtained from the ‘fishing year’ parameter estimates ... log-linear any chosen ref- erence level for an additive factor included in η’ other than YEAR simply ... 20 30 40 50 -0 .6 -0 .4 -0 .2 0. 0 0. 2 0. 4 0. 6 Ship index R an do n ef fe ct e st ... effort as an offset. For 1 < λ < 2 this model is equivalent to assuming a compound Poisson-gamma ... -classifi cation. Further, the inclusion of an area stratum by fi shing year interaction as an additional ...
Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 59–80 : Auteur(s): Candy, S.G
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Distribution of fish larvae at South Georgia: horizontal, vertical, and temporal distribution and early life history relevant to monitoring year-class strength and recruitment
distribution and early life history relevant to monitoring year-class strength and recruitment Abstract ... . The findings are discussed in relation to surveys for sampling the early stages of fish at South ... island is an important breeding area for higher predators which are also studied by shorebased research ... depth strata. These net hauls were at 250-150, 150-70 and 70-2 m depth, each for 30 minutes duration ... --'60, 60-100, 100-140, 140-180 and 180-220 m; each net was fished for 20 minutes at 2.5 knots with ... year class strength of the youngest age class of the population. It would also be pertinent to ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 105-141 : Auteur(s): North, A.W.
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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 ... -class (1 year olds in 1988), was quite robust, despite the use of various combinations of survey and ... biomass of 5 year olds predicted by the VPA for 1991/92 might be an artefact of the analysis. In the ... (numbers of fish) by age group in the projected year (1992 for ADAPTl and 1991 for ADAPT2). The failure ... of the ADAPT to produce reasonable estimates for age group 2 in the projected year is understandable ... commercial length and age distribution for the catch-at-age in that year (Parkes, 1991). Other aggregations ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 49–79 : Auteur(s): Parkes, G.