Résultats de la recherche
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Effects of orientation on acoustic scattering from Antarctic krill at 120 kHz
, had substantial freedom to move, and showed more or less random orientation. One thousand echoes were ... collected per animal. Orientation data were recorded on video. The acoustic data were analyzed and target ... animal orientation. Use of these scattering patterns with orientation data from shipboard studies of E ... . superb a DWBA scattering model is proposed that is scalable by animal length. With good orientation ...
Meeting Document : WG-EMM-99/42 : Auteur(s): D.E. McGehee (USA), R.L. O’Driscoll (New Zealand) and L.V. Martin Traykovski (USA)
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Distribution of krill (Euphausia superba Dana) catches in the South Shetlands and South Orkneys
December to March was taken within 40 km of the coast, and 90% within 80 km in all years 1988-1990. In 1987 ... the literature are used to show that for some years, at distances of between 20 and 60 km from ... Abstract: Zones of 20 km width are defined around selected colonies of penguins distributed ... and 1988 75% of the catch in Subarea 48.2 between December and March was taken within 80 km of ...
Meeting Document : WG-KRILL-92/19 : Auteur(s): D.J. Agnew (Secretariat)
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The state of exploited fish stocks in the Southern Ocean - a review
until the season 1989/90. About two thirds of the catches have been taken in the Atlantic Ocean sector ... Union since more than 20 years. The total yield from the Southern Ocean has been 2.85 million tonnes ... (mainly South Georgia) while the remaining one third originated primarily from the Kerguelen waters in the ... . Champsocephalus gunnari around South Georgia has recovered two times from low stock sizes following heavy fishing ...
Meeting Document : SC-CAMLR-X/BG/13 : Auteur(s): Delegation of Germany
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Krill catches and consumption by land-based predators in relation to distance from colonies of penguins and seals in the South Shetlands and South Orkneys
March was taken within 40 km of the coast, and 90% within 80 km in all years 1988-1990. In 1987 and 1988 ... Abstract: Zones of 20 km width are defined around selected colonies of penguins distributed ... 75% of the catch in Subarea 48.2 between December and March was taken within 80 km of colonies in the ... are used to show that for some years, months and zones of distance from the shore the catch of krill ...
Meeting Document : SC-CAMLR-X/BG/07 : Auteur(s): Secretariat
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Towards an initial operational management procedure for the krill fishery in Subareas 48.1, 48.2 and 48.3
reductions may prove necessary during the 20 year period considered. Simulation tests, including one ... ;Composite Index" proposed by the Workshop on the krill CPUE simulation study. Annual TAC'S are ... as the average CPUE over that time. Thereafter TAC'S may increase by Cr% per annum. However ... 's CPUE values fall below a target level of 0.75 CPUEref. An operating model of kril1 dynamics in ...
Meeting Document : SC-CAMLR-VIII/BG/17 : Auteur(s): Delegation of South Africa
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Preliminary report of sound-speed contrast and density of krill measured on board RV Kaiyo Maru
, morphology, orientation, and material properties of krill are required. There are two important material ... properties: one is the ratio of the density of the animals to that of the surrounding water (density contrast ... ) and the other is the ratio of the sound speed in animal to that in the surrounding water (sound-speed ... 25.1mm and 48.6mm were 1.0442 and 1.0348, respectively. Author(s): Y. Takao, H. Yasuma, R. Matsukura and ...
Meeting Document : WG-EMM-05/36 : Auteur(s): Y. Takao, H. Yasuma, R. Matsukura and M. Naganobu (Japan)
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Fishing and conservation in southern waters
. The former Soviet Union has been the most important fishing nation, taking 80-90 % of the entire catch ... with the 1970's and 1980's, when most fisheries were subsidized, economic considerations and ... the 1990's. Author(s): Delegation of Germany Title: Fishing and conservation in southern waters ... . The krill catch from the Southern Ocean has been 4.9 million tonnes to date. More than 90 % of this ...
Meeting Document : SC-CAMLR-XII/BG/11 : Auteur(s): Delegation of Germany
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Direct ageing of Antarctic krill (Euphausia superba) – potential utility of eyestalk sections for age determination
) and fall on the line for two and three year old krill. If validated, the technique should allow the ... seasons. Marks consistent with annuli observed in laboratory raised krill were observed. Length at age ... Antarctic Division and examined using the methods outlined in (Kilada et al. 2012). Two analyses are ... . 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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Annual variation in breeding biology of gentoo penguins, (Pygoscelis papua) at Bird Island, South Georgia
varied annually, and with age of the breeding bird, nest location and, in one year, with laying date ... -year period (1986-1988) at Bird Island, South Georgia, with particular reference to birds of known age ... -3.4 days. Chicks creched when 25-30 days old. and this varied between years. possibly related to food ... breeding population at Bird Island decreased by 20% and increased by 84% in successive years during the ...
Meeting Document : WG-CEMP-90/38 : Auteur(s): T.D. Williams (United Kingdom)
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Variability of krill biomass estimates in repeated mesoscale surveys in relation to CCAMLR-2000 Survey
” (11.10.84-14.12.84 and 20.01.88-09.03.88). There were used similar gear (Isaak's Kidd Midwater Trawl ... layers sampled during CCAMLR-2000 and Soviet surveys, krill biomass derived from data collected in 80-s ... krill biomass since 80-s, however rate of this increase is impossible to determine on the present stage ... Abstract: One of the important problems in interpreting CCAMLR-2000 results is how they reflect ...
Meeting Document : WG-EMM-01/28 : Auteur(s): V.A. Sushin, F.F. Litvinov (Russia) and V. Siegel (Germany)