Résultats de la recherche
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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 in ... identified only 6 of the 16 krill aggregations sampled the nets. contrast the '2 freq model' and ...
Meeting Document : SG-ASAM-09/04 : Auteur(s): J. Watkins and S. Fielding (United Kingdom)
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Preliminary results on the composition and abundance of the krill stock in the southern Bellingshausen Sea (Antarctic, CCAMLR Subarea 88.3)
Abstract: Krill sampling was carried out onboard RV ‘Polarstem’ from January 25 to March 11, 1994 ... south of 66°S, between 68°W and 120°W. Krill Euphausia superba abundance and biomass was in the lower ... spatial separation for size groups was observed for krill, with small size groups being more abundant in ... . The overall krill length frequency distribution was similar to the composition reported from the South ...
Meeting Document : WG-EMM-95/18 : Auteur(s): Siegel, V.
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Direct ageing of Antarctic krill (Euphausia superba) – potential utility of eyestalk sections for age determination
Abstract: We outline a method for the direct determination of age in Antarctic krill (Euphausia ... proof of concept study using several known age krill grown under controlled conditions at the Australian ... performed. First, longitudinal sections of the eyestalk from known age krill (2+ and 3+ years old) were ... . Second, six krill were aged (blind to the reader) from samples collected during summer and winter (2013 ...
Meeting Document : WG-EMM-15/45 : Auteur(s): C. Reiss (USA), R. Kilada (Canada) and S. Kawaguchi (Australia)
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Distribution and abundance of Antarctic krill (Euphausia superba) off East Antarctic (30–80°E) in January–March 2006
of Division 58.4.2 for the purposes of estimating the unexploited biomass (B0) of Antarctic krill ... acoustic estimates of krill mean biomass density, biomass and variance. The mean acoustic biomass density ... of krill, integrated to 250 m depth across the entire survey stratum (1.31 million km2), was 9.48 g m ... -2. B0 was estimated to be 12.46 million tonnes with a CV of 15.15%. Krill were widely distributed at ...
Meeting Document : WG-EMM-07/33 : Auteur(s): T. Jarvis, N. Kelly, E. van Wijk, S. Kawaguchi and S. Nicol (Australia)
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Modelling the impact of krill fishing on seal and penguin colonies
Conservation of Antarctic Marine Living Resources (CCAMLR) concerns the potential overlap of the krill fishery ... region. The dynamics of krill in this region are strongly influenced by advective processes. A key ... ) are necessary given that there is a flux of krill through this region with its islands habited by ... predator colonies. In order to estimate the krill production actually available for predator consumption ...
Meeting Document : WG-EMM-05/14 : Auteur(s): É.E. Plagányi and D.S. Butterworth (South Africa)
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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, the ... derived with the generic krill shape and scaled to animal length (L). This implies that crustacean target ...
Meeting Document : WG-EMM-04/40 : Auteur(s): S.G. Conti, D.A. Demer (USA) and A.S. Brierley (United Kingdom)
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Krill distribution in the western Atlantic sector of the Southern Ocean during 1983/84, 1984/85 and 1987/88 on the basis of the Soviet mesoscale surveys with Isaacs Kidd midwater trawl
area of krill between Antarctic Peninsula and South Georgia Island are considered. Surveys including ... standard method by Isaacs Kidd Midwater Trawl in the layer 0-100 m. Krill biomass distribution (g/1000 m3 ... investigated. The results of surveys confirm modern understanding of general pattern of krill distribution and ... ). The most spatial-temporal stability of the krill distribution field with more higher biomass of ...
Meeting Document : WG-EMM-98/32 : Auteur(s): V.A. Sushin and K.E. Shulgovsky (Russia)
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Assessment of krill biomass in fishing grounds using the data on fishing intensity and hydroacoustic method
fishing intensity based on actual fishing effort and estimating the initial krill biomass prior to ... beginning of the fishery. Application of the statistical method for assessment of the initial krill biomass ... krill biomass estimate produced by the echo integrating apparatus used in the layer fished with the ... trawl. As applied to the estimate of trawl catchability in the krill fishery, this method is reliable ...
Meeting Document : SC-CAMLR-VIII/BG/10 : Auteur(s): USSR
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Impacts of rising sea temperature on krill increase risks for predators in the Scotia Sea
Antarctic krill, Euphausia superba, might affect populations of krill and dependent predators (whales ... for predators by curtailing krill fishing at different points in the 21st century. The projected ... effects of ocean warming on krill biomass were strongest in the northern Scotia Sea, with a ≥ 40% decline ... in the mass of individual krill. Projections also suggest a 25% chance that krill biomass will fall ...
Meeting Document : WG-EMM-18/P02 : Auteur(s): E.S. Klein, S.L. Hill, J.T. Hinke, T. Phillips and G.M. Watters
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A conceptual model of Japanese krill fishery
Abstract: The behaviour patterns of Japanese krill fishery vessels in Area 48 were analysed using ... , krill density, krill, size, ice condition, transshipment, and salp-by catch accounted for 95.6% of the ... changes. Although low krill density was the primary reason for changing fishing grounds, other seasonal ... succession of the Japanese krill fishing operation revealed that they tend to utilize fishing grounds close ...
Meeting Document : WG-EMM-05/30 : Auteur(s): S. Kawaguchi, S. Nicol (Australia), K. Taki and M. Naganobu (Japan)