Résultats de la recherche
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Describing krill: swarms or integration intervals?
Abstract: CCAMLR anticipates that acoustic data collected from krill fishing vessels will be ... incorporated into krill feed back management. Acoustic data collected from fishing vessels may have different ... may contain seabed aliased echoes and instrument cross-talk. Analysing acoustic data on a krill-swarm ... estimated mean areal krill density for a small (65 km by 60 km) survey conducted in the waters off Mawson ...
Meeting Document : SG-ASAM-17/02 : Auteur(s): M.J. Cox
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Distribution and size-age composition of Antarctic krill in the South Orkney Islands region (CCAMLR Subarea 48.2)
Abstract: This paper describes distribution and size-age composition of Antarctic krill ... /2009 and 2009/2010 seasons. All age cohorts of krill passed spawning during the season 2008/2009, while ... in anomalous cold 2009/2010 season significant proportion of krill of cohort 2+ skipped spawning ... . Individuals of Antarctic krill in age 1+ were absent in catches in both 2008/2009 and 2009/2010 seasons ...
Meeting Document : WG-EMM-10/16 : Auteur(s): D.O. Sologub and A.V. Remeslo (Russia)
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Estimating Antarctic krill density from multi-beam observations using distance sampling methods
processing of acoustic data from fishing vessels. Some krill fishing vessels are equipped with scanning or ... sampling theory- that provides a general means for estimating krill density and biomass from vertically ... constraints of krill target strength models, acoustic instrument stability, and survey design allow the use of ... data observed with horizontally oriented multi-beam and scanning sonars to contribute to krill ...
Meeting Document : SG-ASAM-12/05 : Auteur(s): M.J. Cox (Australia)
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Ecosystem conservation and the race to krill
Abstract: CCAMLR has been managing the krill fishery without sufficient measures needed to meet ... improvements in the management of Antarctic krill fisheries, including establishing feedback management ... procedures, requiring 100% scientific observer coverage on board krill vessels, and implementing further ... protective measures to prevent excessive concentration of krill fishing in coastal areas close to predator ...
Meeting Document : CCAMLR-XXXIV/BG/28 Rev. 1 : Auteur(s): Submitted by ASOC
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An illustrative management procedure for exploring dynamic feedback in krill catch limit allocations among small-scale management units
subdivision of the precautionary catch limit for krill among 15 small-scale management units (SSMUs) in the ... subdivide the krill catch between SSMUs. Different MPs are then simulation tested with their performances ... reducing the abundances of predators (and krill) below certain levels, as well as the variability in future ... average krill catches per SSMU associated with each MP. The key assumption made here is that data will be ...
Meeting Document : WG-EMM-06/28 : Auteur(s): É. Plagányi and D. Butterworth (South Africa)
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Relationships between oceanographic environment and distribution of krill and baleen whales in the Ross Sea and adjacent waters, Antarctica in 2004/05
geographical distribution of the main biological prey and predator populations such as krill including other ... below are MTEM-200 values).- Antarctic krill mainly distributed in the waters between 0 to-1℃ of MTEM ... extended in the waters less than-1℃ of the Shelf Water (SW) zone. Ice krill distributed in the waters ... . The interaction between distributions of krill and baleen whales with MTEM-200 could give quantitative ...
Meeting Document : WG-EMM-08/31 : Auteur(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, T. Iwami and K. Ito (Japan)
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Uncertainty in acoustic surveys of Antarctic krill
Abstract: Studied were four primary sources of uncertainty in krill density estimates from ... krill TS was then investigated through in situ measurements (Hewitt and Demer, 1991). The TS data ... krill TS estimates were conservatively estimated to be 0 dB and ±4.0 dB, respectively. The uncertainty ... studies indicated that scattering from S. thompsoni contributed to a positive bias in the krill density ...
Meeting Document : WG-EMM-95/72 : Auteur(s): Demer, D.A.
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Surface water masses, primary production, krill distribution and predator foraging in the vicinity of Elephant Island during the 1989-90 austral summer
primary productivity, the distribution and demography of krill, and the foraging patterns of krill ... identified as the western end of the Weddell-Scotia Confluence. Krill abundance increased approximately 5 ... immigration from east of the study area. Krill sampled throughout the observation period were reproductively ... February. Krill composed 99% of the diet of chinstrap penguins and over 80% of the diet of fur seals ...
Meeting Document : WG-CEMP-90/11 : Auteur(s): A.F. Amos, J.L. Bengtson, O. Holm-Hansen, V.J. Loeb, M.C. Macaulay and J.H. Wormuth (USA)
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Report from a krill- focused survey with RV Kronprins Haakon and land-based predator work in Antarctica during 2018/19
Abstract: The primary objective for this krill research activity was twofold 1) to conduct a ... survey that provides updated estimates of the biomass and distribution of krill which are used in models ... high krill-density areas, contains state-of-the art methods and employs modern technology for the ... Planning Domain 1 encompasses the major krill fishing grounds. Thus, data supporting FBM are critical if ...
Meeting Document : WG-EMM-2019/07 : Auteur(s): B. Krafft, K. Bakkeplass, T. Berge, M. Biuw, J. Erices, E. Jones, T. Knutsen, R. Kubilius, M. Kvalsund, U. Lindstrøm, G.J. Macaulay, A. Renner, A. Rey, H. Søiland, R. Wienerroither, H. Ahonen, J. Goto, N. Hoem, M. Huerta, J. Höfer, O. Iden, W. Jouanneau, L. Kruger, H. Liholt, A. Lowther, A. Makhado, M. Mestre, A. Narvestad, C. Oosthuisen, J. Rodrigues and R. Øyerhamn
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Krill distribution patterns in the Atlantic sector of the Antarctic during the CCAMLR-2000 Survey
the large scale krill biomass in the South Atlantic Sector of the Antarctic. Four vessels from Japan ... krill distribution showed three distinct geographical clusters of size frequency distributions. Small to ... medium sized juvenile and subadult krill mainly occurred east of the South Orkney Islands. Adult krill ... adult krill larger than 50 mm mean size was found to the north of cluster 2, but at the same time was ...
Meeting Document : WG-EMM-00/6 Rev. 1 : Auteur(s): V. Siegel (Germany), S. Kawaguchi (Japan), F. Litvinov (Russia), V. Loeb (USA) and J. Watkins (United Kingdom)