Search results
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Measurements of sound-speed and density contrasts of Antarctic krill (Euphausia superba) on board RV Kaiyo Maru
Abstract: In order to calculate the target strength of Antarctic krill (Euphausia superba) using ... contrasts between the animal and the surrounding water are required. Sound-speed and mass-density of krill ... and 2004/2005. Samples of krill were caught by a RMT(1+8). Mass-density of krill was measured by density ... . The corresponding sound-speed contrast of krill with mean total lengths of 44.2mm was 1.011 in the South Shetland ...
Meeting Document : WG-EMM-08/56 Rev. 1 : Author(s): Y. Takao, H. Yasuma, R. Matsukura, K. Amakasu and M. Naganobu (Japan)
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Krill population trends
Abstract: Krill (Euphausia superba) distribution and abundance data are available from a number ... fisheries data and from the distribution of krill predators. Each of these forms of data collection has its ... own biases and limitations and our current understanding of krill distribution and abundance comes ... krill, based mainly on analysis of available scientific net data. There is also evidence of intense ...
Meeting Document : CCAMLR-IWC-WS-08/11 : Author(s): Tarling, G., Watkins, J., Quetin, L., Reiss, C., Atkinson, A., Ross, R., Pakhomov, E., Kawaguchi, S., Nicol, S., Siegel, V.
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Quantifying the escape mortality of trawl caught Antarctic krill (Euphausia superba)
Abstract: Antarctic krill (Euphausia superba) is an abundant fishery resource, the harvest levels ... of which are expected to increase. However, many of the length classes of krill can escape through commonly ... fishing gear. The methods for determining fishing mortality in krill are still poorly developed. We used ... mortality rates of escaped krill. Haul duration, hydrological conditions, maximum fishing depth and catch ...
Meeting Document : WG-EMM-16/04 : Author(s): B.A. Krafft, L.A. Krag, A. Engås, S. Nordrum, I. Bruheim and B. Herrmann
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Preliminary results from the International Synoptic Krill Survey in Area 48, 2019
Abstract: Preliminary results from the International Synoptic Krill Survey in Area 48, 2019 ... results from four (vessels from the Association of Responsible Krill harvesting companies (ARK), Norway ... , which were based on the methods and procedures used in the CCAMLR 2000 krill acoustic survey ... . Backscatter from krill were delineated using the 'swarms' method and integrated to produce ...
Meeting Document : WG-EMM-2019/47 : Author(s): G. Macaulay, G. Skaret, T. Knutsen, O.A. Bergstad, B. Krafft, S. Fielding, S.G. Choi, S. Chung, K. Demianenko, V. Podhornyi, K. Vishnyakova, L. Pshenichnov, A. Chuklin, A. Shishman and M.J. Cox
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Biomass results from the International Synoptic Krill Survey in Area 48, 2019
Abstract: Results from the International Synoptic Krill Survey in Area 48, 2019, are presented ... and procedures used in the CCAMLR 2000 krill acoustic survey. Backscatter from krill were delineated using ... the ‘swarms’ method and integrated to produce distribution maps of krill areal density and survey standing ... stock estimates. Krill areal density for the CCAMLR 2000 strata was 35.2 gm-2, producing a standing ...
Meeting Document : SG-ASAM-2019/08 Rev. 1 : Author(s): G. Macaulay, G. Skaret, T. Knutsen, O.A. Bergstad, B. Krafft, S. Fielding, S. Choi, S. Chung, K. Demianenko, V. Podhornyi, K. Vishnyakova, L. Pshenichnov, A. Chuklin, A. Shishman, X. Wang, X. Zhao and M. Cox
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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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On the problem of icefish (Champsocephalus gunnari) (Channichthyidae) and krill (Euphausia superba) interaction in the South Georgia area
Abstract: The interaction of icefish and krill in the South Georgia area has been analysed ... and as adults utilize the pelagic forage resource, the bulk of which is constituted by krill. At the same time ... krill content in the food of different length groups varied. The effect of krill on icefish growth ... distribution pattern of fish is sufficiently stipulated by the impact of krill distribution, being ...
Meeting Document : WG-FSA-04/41 : Author(s): S.M. Kasatkina and Zh.A. Frolkina (Russia)
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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.