Search results
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CPUEs and body length of Antarctic krill during 1991/92 season in the fishing grounds north of Livingston Island
Abstract: This paper summaries Japanese krill catch data during austral summer in 1991/92 season ... values at the height of summer (late January- late March). Krill with modal lengths of 41-45 mm were ... : CPUEs and body length of Antarctic krill during 1991/92 season in the fishing grounds north ... This paper summaries Japanese krill catch data during austral summer in 1991/92 season. A main ...
Meeting Document : WG-KRILL-93/25 : Author(s): T. Ichii (Japan)
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Net-based verification of acoustic techniques used to identify Antarctic krill
Distorted Wave Approximation (SDWBA) krill target strength model, are assessed. Three frequency acoustic ... data and concurrent net information, from 16 net hauls through krill aggregations, were collected ... . Using the SDWBA model, dB difference identification ranges based on the length-frequencies of krill ... only 6 of the 16 krill aggregations sampled the nets. contrast the '2 freq model' and freq ...
Meeting Document : SG-ASAM-09/04 : Author(s): J. Watkins and S. Fielding (United Kingdom)
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Broadbandwidth sound scattering and absorption from krill (Meganyctiphanes norvegica), Mysids (Praunus flexuousus and Neomysis integer) and shrimp (Crangon crangon)
Abstract: Sound scattering and absorption measurements were made of Northern krill ... measurements made of Antarctic krill (Euphausia superba; Demer and Conti, 2003a). The measurements of total ... krill, indicating its validity for other euphausiids species with similar size and shape. However ... derived with the generic krill shape and scaled to animal length (L). This implies that crustacean target ...
Meeting Document : WG-EMM-04/40 : Author(s): S.G. Conti, D.A. Demer (USA) and A.S. Brierley (United Kingdom)
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Krill biomass estimates for South Georgia, December and January 1996/97
Georgia during December/January 1996/97. Netting suggested that the mean lengths of krill within ... box-specific krill target strength (TS) values of-38.89 and-38.59 dB kg-1. Acoustic signals believed ... to be attributable to krill were identified on the basis of the difference between mean volume backscattering ... strength at 120 and 38kHz (mvbsl20 kHz- mvbs38kHz between 2 and 12 dB indicative of krill). Mean volume ...
Meeting Document : WG-EMM-97/48 : Author(s): Goss, C., Watkins, J.L., Brierley, A.S.
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Bias in the estimation of krill yield from using a deterministic formulation of the median unexploited spawning biomass
krill yields according to decision rules that relate spawning stock status to the median unexploited ... spawning biomass, SB0. The first model has been developed specifically for krill, the krill yield model ... of the spawning stock (as a proportion of SB0) at the end of the projection run (level of escapement). The krill ... . This paper examines the implications for estimates of krill yield from using the biased estimate of SB0 ...
Meeting Document : WG-EMM-97/45 : Author(s): de la Mare, W.K., Constable, A.J.
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Biomass/CCAMLR krill review
Abstract: Current knowledge of the ecology, biology and life history of the Antarctic krill ... are either directly or indirectly applicable to the effective management of krill exploitation within ... of krill on various scales ranging from the global to individual aggregations (e.g., swarms) is discussed ... separation considered. Recent attempts to assess the krill standing stock directly are examined ...
Meeting Document : SC-CAMLR-VII/BG/39 : Author(s): D.G.M. Miller and I. Hampton (South Africa)
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Some comments on the procedure of krill target strength assessment in echosurveys
in echosurveys is discussed. It is known that krill abundance and biomass estimation should be considered as two ... selectivity and catchability. Krill abundance estimation related to TS target strength values requires another ... of MSBS (MVBS) acoustic parameter distribution and krill length (weight) distribution in the study area ... . However, the information obtained in that case provides not only total krill abundance value but also ...
Meeting Document : WG-EMM-98/21 : Author(s): S.M. Kasatkina (Russia)
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Target strength of Antarctic krill
Abstract: In-situ measurements of individual krill target strength are presented (modal value ... by the BIOMASS equation for 47.44mm krill. Author(s): R.P. Hewitt and D.A. Demer (USA) Title: Target strength ... of Antarctic krill Approval: Approved ... In-situ measurements of individual krill target strength are presented (modal value = -69db). Net ...
Meeting Document : WG-KRILL-91/13 : Author(s): R.P. Hewitt and D.A. Demer (USA)
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Antarctic krill populations in the outflow region of the north-western Weddell Sea
Abstract: A meso-scale zooplankton and krill net sampling survey was carried out in the north ... March 2013. The aim of the survey was to study the zooplankton composition and krill abundance ... of the survey area was covered by ice during the summer season. Antarctic krill densities were found ... to be highest in the western Peninsula region and lower in ice-covered Weddell Sea waters. Overall krill density ...
Meeting Document : WG-EMM-13/24 : Author(s): V. Siegel (European Union)
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Distributions and predator-prey interactions of macaroni penguins, Antarctic fur seals, and Antarctic krill near Bird Island, South Georgia
. Simultaneous surveys of marine birds, Antarctic fur seals and Antarctic krill were conducted along a series ... between the distributions of predators and their prey with respect to the abundance of krill in the water ... correlations with Antarctic krill density across a wide range of spatial scales. Because krill was abundant ... , we were able to demonstrate an additional influence of Antarctic krill abundance at measurement ...
Meeting Document : WG-CEMP-93/12 : Author(s): G.L. Hunt, Jr (USA), D. Heinemann (USA) and I. Everson (United Kingdom)