Résultats de la recherche
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Supervised and unsupervised (RapidKrill) estimates of krill density from DY098
up with a similar estimate of krill NASC and krill density as the supervised method. An ... estimate of krill density is supplied for the WCB survey using three methods. The multifrequency method ... produces a krill density of 8.60 gm-2, compared with 21.76 gm-2 (supervised) or 20.41 gm-2 (unsupervised ... ) estimates of krill density from DY098 Approval: Approved Secretariat Workflow Status: Content Approved ...
Meeting Document : SG-ASAM-2019/09 : Auteur(s): A. Ariza, S. Fielding and R. Blackwell
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f-sc-xv-a5.pdf
... que les formulaires d'observation des poissons, et de renvoyer ceux du krill aux spécialistes du krill ... , dans le régime alimentaire de cette espèce, du poisson dans tous les secteurs et du krill dans la sous-zone 48.3 ... dans WG-FSA-96/28. Le krill semble constituer l'aliment principal retrouvé dans l'estomac de poissons ... de krill disponible, une grande proportion d'estomacs sont vides. Le système de prélèvement
application/pdf attached to:WG-FSA-96Meeting Report : WG-FSA-96
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Krill (Euphausia superba) distribution in relation to water movement and phytoplankton distribution off the northern South Shetland Islands
surveyed to investigate mechanisms for the formation of krill concentrations and to estimate acoustic ... biomass of krill in the 1990/91 austral summer. Main krill concentrations occurred in the shelf waters ... north of the islands, as usual. Tracks of drifting buoys (with curtain drogues at 30 m depth where krill ... ground for krill.) High concentrations of chlorophyll a were also measured in the shelf waters, showing a ...
Meeting Document : WG-KRILL-91/22 : Auteur(s): Delegation of Japan
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Factors influencing Antarctic krill distribution in the South Shetlands
Abstract: The influences of biological and physical factors in the environment upon krill ... austral summer. Krill showed a distinct offshore-inshore heterogeneities in abundance and maturity stage ... zone (37.3 g/m2), and the highest along the shelf break (135.1 g/m2) in the inshore zone; krill were ... factors were considered to be responsible for this characteristic distribution of krill. Diatoms were the ...
Meeting Document : WG-KRILL-93/38 : Auteur(s): T. Ichii, H. Ishii and M. Naganobu (Japan)
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Differences in distribution and population structure of krill (Euphausia superba) between penguin and fur seal foraging areas near Seal Island
Abstract: Shipboard tracking study for krill-eating predators (penguins and female fur seals) at ... . Penguin foraging areas were formed in inshore region, where krill frequently occurred but higher density ... areas of krill (≥250g/m2) were rather limited. In contrast, fur sea! foraging areas were formed in ... offshore region, where krill occurred only occasionally but they tended to form extensive aggregations (ca ...
Meeting Document : WG-KRILL-92/27 : Auteur(s): T. Ichii, H. Ishii (Japan), J.L. Bengtson, P. Boveng, J.K. Jansen (USA) and M. Naganobu (Japan)
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Possible effects of different levels of fishing on krill on predators - some initial modelling attempts
of the parameters of predator survival rates as functions of krill abundance, by considering a krill ... breeding success patterns for certain krill predator species. A "one-way" interaction model is ... developed, in which krill abundance fluctuations impact the predator population, but not vice versa ... . Computations based on this model indicate that variability in the annual recruitment of krill results in ...
Meeting Document : WG-KRILL-93/43 : Auteur(s): D.S. Butterworth and R.B. Thomson (South Africa)
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Further calculations of the effects of krill fishing on predators
situation where predator survival rates depend on other factors in addition to krill biomass. This is ... achieved by making the survival rates depend instead on krill "availability", where there is a ... random component in the relationship between krill biomass and availability. An examination of the ... resilience of the albatross population to the effects of a krill fishery. An approach for estimating the ...
Meeting Document : WG-Krill-94/24 : Auteur(s): D.S. Butterworth and R.B. Thomson (South Africa)
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Krill distribution and biomass variability within Subarea 48.3 in June 1991
Abstract: Temporal and spatial variability of krill distribution characteristics was investigated ... in an 8 x 6 mile micropolygon, where eight consecutive hydroacoustic surveys were carried out. Krill ... 1 554 units. Krill biomass in the polygon varied spasmodically within the range from 1 091 to 6 085 ... tonnes. Krill distribution variability revealed in the polygon suggests an irregular import and export of ...
Meeting Document : WG-KRILL-93/35 : Auteur(s): S.M. Kasatkina, E.N. Tymokhin, P.P. Fedulov and K.E. Shulgovskiy (Russia)
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Target strengths of krill at 136 and 20 kHz
Abstract: Estimation of krill target strength was made by ensonification of encaged live krill ... and using trawling-acoustic method. Ensonification of encaged live krill. For aggregations with mean ... lengths in the range (45,50) mm the mean single-krill target strengths are in the range (-68,-69) dB at ... 136 kHz. For aggregations with mean lengths in the range (43,47)mm the mean single-krill target ...
Meeting Document : WG-KRILL-91/29 : Auteur(s): S.M. Kasatkina (USSR)
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Report of biological observations carried out on board the krill fishing vessel More Sodruzhestva in April to August 1991
Abstract: An observation program was carried out by a biologist-observer on board the krill ... observation of krill fishing operations, collection and processing of catch samples for analysing ... physiological status and size composition of krill and also for determining the level of by-catch of juvenile ... channichthyids. In general, krill density in Subarea 48.2 was twice as high as that in Subarea 48.3. Catch-per ...
Meeting Document : WG-KRILL-92/06 : Auteur(s): V.I. Latogursky (Russia)