Search results
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Determining the sex of Antarctic krill Euphausia superba using carapace measurements
of 87% of male and 89% of female Antarctic krill Euphausia superba. This facilitated the use of sex ... -specific regression models which increased the accuracy of total length estimates. Author(s): K. Reid and ... J. Measures (United Kingdom) Title: Determining the sex of Antarctic krill Euphausia superba using ...
Meeting Document : WG-EMM-99/31 : Author(s): K. Reid and J. Measures (United Kingdom)
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The diet of black-browed albatrosses at the Diego Ramirez Islands, Chile
Abstract: The diet of black-browed albatrosses was studied at Gonzalo Island, Diego Ramirez ... , Chile, during the early chick-rearing period of 2000, 2001 and 2002. Diet composition was determined by ... sampling chick stomach contents during January and February of each year. Reconstituted meal mass was ... mass). The distribution of the prey species indicates that black-browed albatrosses obtained the bulk ...
Meeting Document : WG-FSA-03/9 : Author(s): J. Arata (Chile) and J.C. Xavier (United Kingdom)
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The use of predator-derived krill length-frequency distributions to calculate krill target strength
ecosystem based approach to resource management. We propose a method using krill sampled from the diet of ... predators to provide a length-frequency distribution of krill at times when it is possible to run automated ... operations. This will allow a robust estimate of krill abundance to be estimated from acoustic data. Changes ... in the length-frequency distribution of krill over a period of few weeks produced a 10 % difference ...
Meeting Document : WG-EMM-00/42 : Author(s): K. Reid and A.S. Brierley (United Kingdom)
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An outline of the Antarctic research cruise by the Japanese RV Kaiyo Maru around the South Shetland Islands in 1994/95
Abstract: The seventh Antarctic research cruise by the R/V Kaiyo Maru of the Japanese Fisheries ... Agency was conducted in the southwest of the Scotia Sea, especially in the vicinity of the South Shetland ... Islands from December 1994 to February 1995. The main objective of the seventh research was an ... oceanographic and ecological survey in relation to the distribution and abundance of the Antarctic krill ...
Meeting Document : WG-EMM-95/50 : Author(s): Takao, T., Ogishima, T., Naganobu, M., Ichii, T., Kawaguchi, S.
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Net escapement of Antarctic krill in trawls
Abstract: This document describes the aims and methodology of a three year project (commenced in ... 2012) entitled Net Escapement of Antarctic krill in Trawls (NEAT). The study will include a morphology ... based mathematical modeling (FISHSELECT) of different sex and maturity groups of Antarctic krill ... (Euphausia superba) to predict basic selective characteristics of different trawl gear and net designs ...
Meeting Document : WG-EMM-12/24 : Author(s): B.A. Krafft (Norway), L.A. Krag, B. Herrmann (Denmark), A. Engås, S. Nordrum and S. Iversen (Norway)
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Indexing maturation of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea region
and 88.2 have provided more than a decade of observations to aid in understanding the life history and ... ecology of toothfish. Updated spawning ogives for males and females support the currently used values ... . Using histological samples, a summer GSI threshold of 1% appears to be a good indicator of vitellogenic ... upcoming season. Observations of post-spawning fish on the slope indicate that some females either spawn on ...
Meeting Document : WG-FSA-12/40 : Author(s): S. Parker and P. Marriott (New Zealand)
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Spectra analysis of Drake Passage Oscillation Index (DPOI) from 1952 to 2003, Antarctica
Abstract: An assessment of the environmental processes influencing variability in the recruitment ... and density of Antarctic krill (Euphausia superba DANA) is important as variability in krill stocks ... krill recruitment and density with hypothesized environmental factors; strength of westerly winds ... , Argentina, and Base Esperanza, at the tip of the Antarctic Peninsula, sea ice cover and chlorophyll-a in the ...
Meeting Document : WG-EMM-04/46 : Author(s): M. Naganobu and K. Kutsuwada (Japan)
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Genetic analysis of Antarctic toothfish samples from the Southern Ocean to explore potential stock boundaries
restriction enzyme digests of nine sub regions of the mitochondrial genome. Polymorphisms were found in four ... out of seven introns digested with the restriction enzymes, but there was no population ... differentiation among the three sea areas. While direct sequencing of cytochrome b (665 base pair) showed ... virtually no variation, sequences for ~600 bp of the left domain of the control region showed nucleotide ...
Meeting Document : WG-FSA-04/32 : Author(s): P.J. Smith, S.M. McVeagh (New Zealand) and P.M. Gaffney (USA)
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Performance of an acoustic sonde design
Abstract: The potential of multi-frequency acoustic technology for quantifying fish and plankton ... is widely recognized. At a U.S. GLOBEC workshop in 1991, one of the considered problems was measuring ... frequencies are chosen. Each frequency represents the resonant condition of a circular piston transducer with ... 10-deg beamwidth. The performance of this system is assessed through the maximum detection range of ...
Meeting Document : WG-EMM-95/09 : Author(s): Foote, K.G.
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Preliminary results from CEMP monitoring of Antarctic fur seals, chinstrap penguins and macaroni penguins at Bouvetøya 1996/97
was established at the CEMP site, Nyrøysa, on the western coast of the island. Species included in the ... from the first season of CEMP monitoring (parameters A3, A4, A5, A6, A8, A9, C1 and C2) are reported ... together with results from other CEMP-re1ated work (entanglement of fur seals, and diving behaviour and ... population changes of penguins and fur seals). The population of Chinstrap Penguins at Nyrøysa has declined ...
Meeting Document : WG-EMM-97/20 : Author(s): Hofmeyr, G.J.G., Dyer, B.M., Næstvold, A., Mehlum, F., Gjertz, I., Bakken, V., Isaksen, K., Huyser, O.