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1. 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 : Автор(ы): A. Ariza, S. Fielding and R. Blackwell

2. 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 : Автор(ы): Delegation of Japan

3. 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 : Автор(ы): T. Ichii, H. Ishii and M. Naganobu (Japan)

4. 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 : Автор(ы): T. Ichii, H. Ishii (Japan), J.L. Bengtson, P. Boveng, J.K. Jansen (USA) and M. Naganobu (Japan)

5. 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 : Автор(ы): D.S. Butterworth and R.B. Thomson (South Africa)

6. 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 : Автор(ы): D.S. Butterworth and R.B. Thomson (South Africa)

7. 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 : Автор(ы): S.M. Kasatkina, E.N. Tymokhin, P.P. Fedulov and K.E. Shulgovskiy (Russia)

8. 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 : Автор(ы): S.M. Kasatkina (USSR)

9. 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 : Автор(ы): V.I. Latogursky (Russia)

10. Note on maturity of krill in relation to interannual fluctuations of food environment in the seas around the South Shetland Islands

    Abstract:  Relationship between food environment and maturity of krill around the South Shetland ... fraction larger than 2um was high, feeding activity of krill was also high in the natural environment. 5 ... years data from commercial krill trawlers indicates that percentages of occurrence of gravid female was ... high when the feeding activity of the krill was high through out the season. Therefore, interannual ...

    Meeting Document : WG-KRILL-93/27 : Автор(ы): M. Naganobu and S. Kawaguchi (Japan)

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