Résultats de la recherche
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Analysis of longline fleet operation on the Patagonian toothfish (Dissostichus eleginoides) in the subarea of the South Georgia Island (48.3) in 1989–2003
Abstract: The main characteristics of Patagonian toothfish (Dissostichus eleginoides) catch ... . Taken the intensity of fleet operation as an example in the sub-area, it was confirmed a decrease in ... decrease in catch per unit value and necessity of the more attentive approach to the assessment of the ... state of the toothfish population in this area of traditional fishing and more precautionary approach to ...
Meeting Document : WG-FSA-03/98 : Auteur(s): N.V. Kokorin and A.F. Petrov (Russia)
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Review of management boundaries (SSRU’s) and biological parameters used for the assessment of D. mawsoni in Subarea 88
Abstract: This paper provides a review of the boundaries of the small scale research units used ... boundaries we considered the physical and geographical features of the Subarea including the impact of sea ... ice on fishing practices, as well as the distribution and abundance of the target and bycatch species ... other boundaries of the other four SSRUs are changed to reflect the underlying bathymetry, species ...
Meeting Document : WG-FSA-SAM 03/8 : Auteur(s): P. Horn and S. Hanchet (New Zealand)
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Fish Heaven 2.0: summary of modifications and additions to earlier versions and illustrations of its application as a tool for evaluating fisheries management systems
examples of its application as a tool for evaluating fisheries management systems. As in previous years ... there have been numerous small changes and additions to the functionality of the program. This note ... range of models to be constructed and explored. The application of Fish Heaven as an evaluation tool is ... illustrated by some examples of how Catch Per Unit Effort performs as an indicator of abundance under simple ...
Meeting Document : WG-FSA-SAM 03/15 : Auteur(s): I. Ball (Australia)
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Incident of Antarctic krill (Euphausia superba) mass infection near the coasts of South Georgia Island (Subarea 48.3)
Abstract: In the north-eastern part of South Georgia Island shelf (Subarea 48.3) on 30 July 2001 ... by the disease that had not been described earlier. In the period of winter and spring some males and ... females Euphasia superba of all size groups- from 27 to 52 cm- were affected. From winter to spring the ... percentage of krill invasion increased 2.3 times. In shelf zone and on the continental slope of the South ...
Meeting Document : WG-EMM-02/13 : Auteur(s): M.S. Savich (Ukraine)
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ANALYSIS OF ICE-FISH (CHAMPSOCEPHALUS GUNNARI) SPATIAL DISTRIBUTION FOR OPTIMIZATION OF THE BOTTOM TRAWL SURVEY SAMPLING
surveys in the South Georgia area are analyzed. The high heterogeneity of horizontal and vertical fish ... distribution in the near-bottom layers within the surveyed area is shown. Influence of this fish distribution ... estimates of varying headline height of bottom trawl and shifting trawl stations positions. Under example of ... considerable degree stipulated by heterogeneity of fish distribution in the near-bottom layer relative to the ...
Meeting Document : WG-SAM-09/20 : Auteur(s): S.M. Kasatkina (Russia)
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TIMING OF CLUTCH INITIATION IN PYGOSCELIS PENGUINS ON THE ANTARCTIC PENINSULA: TOWARDS AN IMPROVED UNDERSTANDING OF OFF-PEAK CENSUS CORRECTION FACTORS
that preclude nest censuses being conducted at the peak of egg laying as established by the CCAMLR ... Ecosystem Monitoring Program (CEMP) (Scientific Committee for the Conservation of Antarctic Marine Living ... knowing 1) how the census is timed relative to the peak of egg laying and 2) how nest numbers change ... through the breeding cycle. In this paper we present an analysis relating to both of these two challenges ...
Meeting Document : WG-EMM-PSW-08/15 : Auteur(s): H.J. Lynch, W.F. Fagan, R. Naveen, S.G. Trivelpiece and W.Z. Trivelpiece (USA)
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Consumption of krill by minke whales in Areas IV and V of the Antarctic
Abstract: The consumption of Antarctic krill (Euphausia superba) by the southern minke whale ... (Balaenoptera acutorostrata) in Areas IV and V of the Antarctic was estimated from diurnal change in the ... Whale Research Program Under Special Permit in the Antarctic) data. Estimates of the daily food ... IV were equivalent to roughly one- fourth of a total estimate biomass of krill in Area IV ...
Meeting Document : WG-EMM-97/17 : Auteur(s): Fujise, Y., Tamura, T., Ichii, T.
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In situ target strength measurements of Antarctic zooplankton (Euphausia superba and Salpa thompsoni) at 120 khz and 200 khz, corroboration of scattering models, and a statistical technique for delineating species
Abstract: In-situ measurements of target strength (TS) were made of Antarctic zooplankton ... the 200 kHz single-beam data. The backscattering cross-sectional areas (σbs) of salps are shown to fit ... scattering is from each animal's spheroidal nucleus. Consistent with the measurements of encaged krill ... (5):2985-2988 (1993)], the TS of in-situ krill are shown to fit a deformed cylinder model [T.K ...
Meeting Document : WG-Krill-94/12 : Auteur(s): D.A. Demer and R.P. Hewitt (USA)
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A generalised model for evaluating yield and the long term status of fish stocks under conditions of uncertainty
flexibility for assessing the influence of different patterns of growth, natural mortality, spawning and ... fishing on the estimates of yield per recruit. Also, it can be used to evaluate the performance of a stock ... each year by integrating a set of differential equations which incorporate functions that specify the ... rate of change or magnitude of parameters, such as growth, mortality, age dependent selectivity and ...
Meeting Document : WG-FSA-95/41 : Auteur(s): de la Mare, W.K., Constable, A.J.
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Note on maturity of krill in relation to interannual fluctuations of food environment in the seas around the South Shetland Islands
Abstract: Relationship between food environment and maturity of krill around the South Shetland ... fraction larger than 2um was high, feeding activity of krill was also high in the natural environment. 5 ... years data from commercial krill trawlers indicates that percentages of occurrence of gravid female was ... high when the feeding activity of the krill was high through out the season. Therefore, interannual ...
Meeting Document : WG-KRILL-93/27 : Auteur(s): M. Naganobu and S. Kawaguchi (Japan)