Résultats de la recherche
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A hydroacoustic survey of Antarctic krill populations in CCAMLR Division 58.4.1
include hydroacoustic determinations of krill distribution and abundance and physical oceanographic ... data on krill distribution and abundance will be submitted to CCAMLR for the purpose of setting a ... precautionary catch limit on the krill fishery in Division 58.4.1. Author(s): Nicol, S. Title: A hydroacoustic ... survey of Antarctic krill populations in CCAMLR Division 58.4.1 Approval: Approved ...
Meeting Document : WG-EMM-95/43 : Auteur(s): Nicol, S.
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Some components of uncertainty in the CCAMLR 2000 acoustical survey of krill
acoustical estimate of krill abundance in FAO statistical area 48. The variance in system calibration was ... absorption, and beam characteristics. Uncertainty in krill target strength (TS) was estimated using a ... distorted wave born approximation model of krill TS, fitted with measured distributions of animal lengths ... assumed the three frequency measurements provided independent estimates of the krill biomass. The overall ...
Meeting Document : WG-EMM-00/49 : Auteur(s): D.A. Demer (USA)
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Catch per unit effort data from the early years of commercial krill fishing operations in the Atlantic sector of the Antarctic
Abstract: Catch Per Unit Effort data are presented from krill fishing operations in CCAMLR ... validity of the CPUE index is discussed as an indicator for krill abundance/biomass and caution is ... the amount of krill available in a Statistical Subarea. Overall length frequency distributions from ... influence the representativeness of krill smaller 35 mm in the catches. Author(s): Sushin, V., Siegel, V ...
Meeting Document : WG-EMM-97/22 : Auteur(s): Sushin, V., Siegel, V.
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Estimating density and biomass of Antarctic krill around South Sheltland Islands using the 2-dB difference method
Abstract: The distribution and abundance of krill aggregation inhabiting the Subarea 48.1, which ... 2016 and 38 and 200 kHz from March 6 to 14 in 2017. Krill were collected by the commercial middle trawl ... survey. The weighted krill density and biomass were estimated to be 0.20 g/m 2 and 18 thousand tons (CV ... v difference-3.0-13.8 dB in 2017, respectively. Krill density and biomass were significantly higher ...
Meeting Document : WG-EMM-17/08 : Auteur(s): S.-G. Choi, K. Lee and D. An
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ALLOCATING THE PRECAUTIONARY CATCH LIMIT FOR KRILL AMONGST THE SMALL-SCALE MANAGEMENT UNITS IN AREA 48: THE IMPLICATIONS OF DATA UNCERTAINTIES
Abstract: Over the past few years WG-EMM has been developing a management procedure for the krill ... the distribution of predator demand (Option 2), krill standing stock (Option 3), or the difference ... distribution of predator demand and krill standing stock and assess their potential implications. We consider ... suggest that the data documenting the distribution of krill standing stock are likely to be more reliable ...
Meeting Document : WG-EMM-08/12 : Auteur(s): P.N. Trathan and S.L. Hill (United Kingdom)
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Reconciling theoretical versus empirical target strengths of krill; effects of phase variability on the distorted wave Born approximation
Abstract: A model was recently proposed to predict the target strengths (TS) of Antarctic krill ... elements of a discretized bent cylinder (krill model) causes a dramatic flattening in the side-lobe regions ... krill TS measurements in McGehee et al. (1998). Thus, by accounting for phase-variability in the ... solution of the DWBA model, a more accurate and thus practical tool is developed for predicting krill TS ...
Meeting Document : WG-EMM-02/50 : Auteur(s): D.A. Demer and S.G. Conti (USA)
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DISTRIBUTION OF KRILL AT THRESHOLD DENSITIES SUITABLE FOR FISHING IN THE ATLANTIC SECTOR: ANALYSIS OF THE 2000 SYNOPTIC SURVEY DATA
shelf SSMUs in terms of the frequency of 1nm integration units with krill densities above and below a ... viable in pelagic SSMUs. This is despite the fact that the absolute abundance of both krill and fishable ... concentrations of krill is higher in pelagic than in shelf SSMUs. 5. We also derived empirical relationships ... between SSMU-scale krill density and the frequency of fishable integration units for the full range of ...
Meeting Document : WG-EMM-08/16 : Auteur(s): S. Hill and D. Agnew (United Kingdom)
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Recruitment of Antarctic krill (Euphausia superba) and possible causes for its variability
Abstract: Between year variability of krill year class success and recruitment during the 1977 ... conditions during the preceding winter season, the timing of krill spawning, and the occurrence of dense salp ... concentrations. No correlation is shown with upper water column temperature or krill stock/spawning stock size. A ... concept is developed describing the interactions of various parameters leading to good or poor krill ...
Meeting Document : WG-EMM-95/15 : Auteur(s): Siegel, V., Loeb, V.
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Estimating density and biomass of Antarctic krill (Euphausia superba) around South Shetland using the 2-dB difference method
Abstract: The distribution and abundance of krill aggregation inhabiting the Subarea 48.1, which ... 2016 and 38 and 200 kHz from March 6 to 14 and 38 and 120 kHz on April 27 and May 5 in 2017. Krill were ... identification) based on data from a transect-based survey. The weighted krill density and biomass were estimated ... and 83 thousand tonnes (CV=31.4%) applying S v difference-3.0-13.8 dB in 2017, respectively. Krill ...
Meeting Document : SG-ASAM-18/08 : Auteur(s): S. Choi, K. Lee and D. An
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CPUE values derived from Soviet fishery statistics as indicators of Antarctic krill density fluctuations in 1977–1991
- 1991 are considered. It is assumed that these values adequately describe trends in krill density ... fluctuations. Rather high stability of the values investigated is revealed. It is proposed that krill density ... probable due to the certain krill transport between subareas. Author(s): F.F. Litvinov, A.Z. Sundakov and ... Antarctic krill density fluctuations in 1977–1991 Approval: Approved ...
Meeting Document : WG-EMM-04/39 : Auteur(s): F.F. Litvinov, A.Z. Sundakov and G.N. Andrianov (Russia)