Search results
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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 strengths are in the range ...
Meeting Document : WG-KRILL-91/29 : Author(s): S.M. Kasatkina (USSR)
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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 aggregations ... number varied within the board range from 1 918 to 7 000 and further to 1 554 units. Krill biomass ... in the polygon varied spasmodically within the range from 1 091 to 6 085 tonnes. Krill distribution variability ...
Meeting Document : WG-KRILL-93/35 : Author(s): S.M. Kasatkina, E.N. Tymokhin, P.P. Fedulov and K.E. Shulgovskiy (Russia)
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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 : Author(s): V.I. Latogursky (Russia)
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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 ... in 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 : Author(s): M. Naganobu and S. Kawaguchi (Japan)
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On the intensity of sampling krill trawl catches
Abstract: This paper uses actual krill length frequency data in an attempt to address the problem ... of determining adequate sample size to obtain representative krill length frequency distributions from commercial ... decomposition) which may influence length frequency data quality are also considered. The attention of WG-Krill ... is drawn to the following: * All measurements of length from commercial krill catches should as far ...
Meeting Document : WG-KRILL-90/27 : Author(s): D.G.M. Miller (South Africa)
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Prediction of krill target strength by liquid prolate spheroid model
(TS) of krill. Scattering patterns are shown to demonstrate orientation dependence of krill TS. Length ... . The variability of the TS of krill is large where L/λ is larger than unity. Therefore, a frequency around 70 kHz ... is superior to 120 kHz which are ordinarily used for krill surveys. Author(s): M. Furusawa and Y. Miyanohana ... (Japan) Title: Prediction of krill target strength by liquid prolate spheroid model Approval: Approved ...
Meeting Document : WG-KRILL-93/21 : Author(s): M. Furusawa and Y. Miyanohana (Japan)
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An assessment of the impact of krill fishery on penguins in the South Shetlands
Abstract: The competition between Japanese krill fishery and penguins during their breeding ... information on fishery, penguins and krill biomass. The catch is very low in December followed by roughly ... . Estimated krill biomass varies considerably within the favorite fishing areas due to the movement of krill ... into and out of the area, but high krill biomass (100-1000 x103t) usually existed there. Compared ...
Meeting Document : WG-KRILL-93/07 : Author(s): T. Ichii, M. Naganobu and T. Ogishima (Japan)
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Polish krill fishery in the 1991/92 and 1992/93 seasons results of catches and biological investigations
Abstract: Poland began krill fishing operations in the 1976/1977 season. It has been engaged ... in krill commercial fishery since the 1986/1987 season. Maximum catches, equalling 15.9 thous tonnes. were ... , attained in the 1992/1993 season. The report presents an analysis of Polish krill catches in the 1991/1992 ... calculated. The results of biological investigations of krill on the fishing grounds of the South Orkney ...
Meeting Document : WG-Krill-94/09 : Author(s): J. Sosinski and Z. Cielniaszek (Poland)
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Winter gut contents of the Antarctic krill (Euphausia superba Dana) collected in the South Georgia area
Abstract: Foregut contents of the Antarctic krill Euphausia superba Dana which were collected ... (adults: 78, subadults: 49, juveniles: 3) which were caught by krill trawling from various depths were ... examined in this study. The foregut contents of the krill consisted of various fragments of crustacean ... zooplankton in 77 individuals out of 130 examined. Among the fragments a portion of the pereiopods of krill ...
Meeting Document : WG-KRILL-93/30 : Author(s): Y. Nishino and A. Kawamura (Japan)
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Note on relationship between the Antarctic krill and annual variation of ice edge during 1979 to 1992
Abstract: During 1979 to 1991, relationship between the size of Antarctic krill and the extent ... of the sea ice in the sea area around the South Shetland Islands are described. Mean size of krill near ... . This implies that strong recruitment of small size krill had occurred just after the season with the strong ice ... circumpolar trough. Therefore, it could be suggested climate and ecology of krill populations are closely ...
Meeting Document : WG-KRILL-93/26 : Author(s): M. Naganobu and S. Kawaguchi (Japan)