Search results
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Net sample validation of acoustic techniques used to identify and size Antarctic krill
Abstract: Acoustic surveys to estimate krill biomass require that sound backscattered by krill ... with an RMT8. Around 80 % of the targets thought to be krill on the basis of their appearance on echo-charts ... were also identified as krill on the basis of their difference in backscatter at 38 and 120 kHz (ΔMVBS ... = MVBSI20- MVBS3S; where ΔMVBS between 2 & 12 dB). Biomass values estimated from krill identified using ...
Meeting Document : WG-EMM-97/46 : Author(s): Watkins, J.L., Brierley, A.S.
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Orientation of Antarctic krill in an aquarium
Abstract: Acoustic methods appear to be the best way to estimate Antarctic krill abundance ... directly. Information on body orientation, however, is needed to obtain reliable krill acoustic target ... strength (TS) values, since TS varies with body orientation. Krill body orientation was measured ... (s): Y. Endo (Japan) Title: Orientation of Antarctic krill in an aquarium Approval: Approved ...
Meeting Document : WG-KRILL-93/24 : Author(s): Y. Endo (Japan)
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An acoustic estimation of krill densities to the north of South Georgia in January 1994
strength between the two frequencies (δMVBS = MVBS 120 kHz- MVBS 38 kHz) was used to discriminate krill ... from other acoustic targets. A generic target strength to weight relationship was used to derive krill ... densities from 120 kHz signals attributed krill. At less than 1 g m-2, mean weighted krill densities in both ... evidence of an extreme krill paucity around South Georgia in the 1993/4 season. Author(s): Watkins, J.L ...
Meeting Document : WG-EMM-95/74 : Author(s): Watkins, J.L., Brierley, A.S.
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Krill biomass estimates for two survey boxes to the north east and north-west of South Georgia in January 1996: the beginning of a five-year monitoring program
variability in the abundance of the Antarctic krill Euphausia superba in the South Georgia region ... , and to provide krill biomass estimates for management purposes. Survey box 1 was located to the north-east ... numerous observations of elevated krill abundance have been made. Box 2 was located to the north of Bird ... Island, within a foraging area of prime importance for breeding krill predators. Together the two boxes ...
Meeting Document : WG-EMM-96/18 : Author(s): Watkins, J.L., Murray, A.W.A., Brierley, A.S.
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The structure and spatial distribution of Antarctic krill aggregations from acoustic observation in the South Georgia area
significant distinctions in spatial distribution patterns of krill in the northwestern and the northeastern ... -attractive to fishery. The observed grounds with krill density exceeding the threshold value 100 g/m2 ... of krill aggregations structure in the northwestern and the northeastern parts of South Georgia area allows ... of dependent predators than krill distribution in the form of dense swarms or patches, which on the contrary ...
Meeting Document : WG-EMM-04/66 Rev. 1 : Author(s): S.M. Kasatkina (Russia)
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SELECTIVITY OF CONVENTIONAL AND CONTINUOUS TECHNIQUES OF KRILL FISHERY
Abstract: Combination of conventional and continuous techniques during krill fishery ... of the Antarctic krill (Euphausia superba) caught by these two techniques. Results of comparison are discussed ... in relation to the selectivity of fishing gears and the space-time variability of krill. Differences between ... size composition of krill caught by conventional and continuous techniques of fishery which could ...
Meeting Document : WG-EMM-11/14 : Author(s): D. Sologub (Russia)
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THE USE OF PATENT DATABASES TO DETECT TRENDS IN THE KRILL FISHERY
Abstract: Trends in the krill fishery are currently informed by data on annual catches ... information from the krill industry. This paper uses publicly available patent databases to examine both ... the number and type of patents related to krill that are lodged annually. This information matches well ... be taken over by the Secretariat so that they can maintain an annual register of krill related patents ...
Meeting Document : SC-CAMLR-XXVIII/BG/15 : Author(s): Delegation of Australia
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Methodological aspects of the International Synoptic Krill Survey in Area 48, 2019
Abstract: The effect of differences in the methodology used for the CCAMLR 2000 krill acoustic ... , and 3) the effect of krill discrimination method. Surveying during the day only produced a 6% increase ... in the standing stock estimate and the trawl selectivity between vessels had minimal effect on the krill length ... distributions. The choice of krill discrimination method had a marked effect on the per-stratum biomass ...
Meeting Document : SG-ASAM-2019/10 : Author(s): G. Macaulay, G. Skaret, T. Knutsen and B. Krafft
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An ecosystem-based approach to management: using individual behaviour to predict the indirect effects of Antarctic krill fisheries on penguin foraging
interactions within and between species. 2. Ecological interactions involving krill are of major importance ... between penguins and krill to determine the indirect effect of krill fisheries on penguin foraging success ... food intake. Given the documented links between krill and penguins, this also leads to a prediction ... of decreased penguin survival and reproduction. Krill behaviour is predicted to cause stronger effects of krill ...
Meeting Document : WG-EMM-03/34 : Author(s): S.H. Alonzo, P.V. Switzer and M. Mangel (USA)
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Interaction between oceanography, krill and baleen whales in the Ross Sea and adjacent waters, Antarctica in 2004/05
conditions, and the distribution of krill as prey and baleen whales as predators in the Ross Sea and its ... the thermal conditions, krill and baleen whale distributions. The oceanography of the surface layer ... with distribution patterns of each species. Antarctic krill (Euphausia superb) mainly distributed in the Antarctic ... -200 =-1°C). Ice krill (Euphausia crystallorophias) clearly distributed in SW but not ASW. Humpback ...
Meeting Document : WG-EMM-07/07 : Author(s): M. Naganobu, S. Nishiwaki, H. Yasuma, R. Matsukura, Y. Takao, K. Taki, T. Hayashi, Y. Watanabe, T. Yabuki, Y. Yoda, Y. Noiri, M. Kuga, K. Yoshikawa, N. Kokubun, H. Murase, K. Matsuoka and K. Ito (Japan)