Search results
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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 ... 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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Analysis of maturity of Antarctic toothfish in the Amundsen Sea
Abstract: The results of the comparative histological analysis of the Antarctic toothfish ... 2007 are presented. The morphological parameters, indices of gonads, condition by Fulton and ... cytological parameters of oocytes have been described. Antarctic toothfish ovaries reached mainly the late III ... (57.1%) in 2006 and IV stages of maturity (83.3 %) in 2007 and testes – the IV stage (55%) in 2007. In ...
Meeting Document : WG-FSA-10/50 : Author(s): S.V. Piyanova and A.F. Petrov (Russia)
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In situ target strength measurements of Antarctic zooplankton (Euphausia superba and Salpa thompsoni) at 120 khz and 200 khz, corroboration of scattering models, and a statistical technique for delineating species
Abstract: In-situ measurements of target strength (TS) were made of Antarctic zooplankton ... the 200 kHz single-beam data. The backscattering cross-sectional areas (σbs) of salps are shown to fit ... scattering is from each animal's spheroidal nucleus. Consistent with the measurements of encaged krill ... (5):2985-2988 (1993)], the TS of in-situ krill are shown to fit a deformed cylinder model [T.K ...
Meeting Document : WG-Krill-94/12 : Author(s): D.A. Demer and R.P. Hewitt (USA)
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Precision of growth band determination from eyestalk sections of Antarctic krill (Euphausia superba) preserved in formalin
feedback management of krill fisheries. Samples stored in 70% ethanol provide an opportunity to detect the ... growth bands of eyestalk sections. Moreover, information derived from samples preserved in formalin will ... common in previous decades. Out of 162 Antarctic krill individuals preserved in 5% formalin, the growth ... bands from eyestalk sections of 134 samples were readable. The relationship between the total length and ...
Meeting Document : WG-EMM-18/P16 : Author(s): G.P. Zhu, Y. Yang, Q. Song and H.T. Zhang
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The importance of sea ice association of Antarctic krill for transport and retention in the South Orkneys region: a modelling study
Abstract: The South Orkney Islands region is a key location for understanding the distribution of ... the local ecosystem dynamics in this key region requires greater understanding of the extent to which ... krill- sea ice interactions influence the local distribution and retention of krill. Here we present ... results from a modelling study that suggest that the use of the sea ice habitat by krill affects the ...
Meeting Document : WG-EMM-2019/21 : Author(s): S.E. Thorpe, E.F. Young, E.J. Murphy and A.H.H. Renner
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Analysis of longline fleet operation on the Patagonian toothfish (Dissostichus eleginoides) in the subarea of the South Georgia Island (48.3) in 1989–2003
Abstract: The main characteristics of Patagonian toothfish (Dissostichus eleginoides) catch ... . Taken the intensity of fleet operation as an example in the sub-area, it was confirmed a decrease in ... decrease in catch per unit value and necessity of the more attentive approach to the assessment of the ... state of the toothfish population in this area of traditional fishing and more precautionary approach to ...
Meeting Document : WG-FSA-03/98 : Author(s): N.V. Kokorin and A.F. Petrov (Russia)
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Fish Heaven 2.0: summary of modifications and additions to earlier versions and illustrations of its application as a tool for evaluating fisheries management systems
examples of its application as a tool for evaluating fisheries management systems. As in previous years ... there have been numerous small changes and additions to the functionality of the program. This note ... range of models to be constructed and explored. The application of Fish Heaven as an evaluation tool is ... illustrated by some examples of how Catch Per Unit Effort performs as an indicator of abundance under simple ...
Meeting Document : WG-FSA-SAM 03/15 : Author(s): I. Ball (Australia)
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Progress towards validation of ageing of Dissostichus eleginoides using otoliths
, fish have been treated with strontium to mark their otoliths for validation of subsequent age ... . Results indicate that current methods for ageing D. eleginoides are appropriate: the number of observed ... annuli on the otoliths after the strontium mark was consistent with the time at liberty of the fish after ... determination in this species: investigating the accuracy of ageing small fish (1000 days; and developing ...
Meeting Document : WG-FSA-04/67 : Author(s): K. Krusic-Goluband R. Williams (Australia)
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Distribution and biological characteristics of two toothfish species of genus Dissostichus (family Nototheniidae) off Bouvet Island
) toothfish, were registered during the fishery on Dissosyichus spp. on the shelf edge and slope of Bouvet ... surrounding the island. The vertical distribution of two species was differentiated distinctly, with the ... crossover point at depth of 1300 m. For both species the size and weight compositions were studied; indices ... of stomach fullness and qualitative diet composition as well as maturation stages of gonads and their ...
Meeting Document : WG-FSA-11/17 : Author(s): A.F. Petrov (Russia)
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Examination of the gut contents of Patagonian toothfish (Dissostichus eleginoides) from the toothfish pot fishery trials around South Georgia
CCAMLR, an understanding of the trophic relationships of exploited species is vital. Toothfish ... the trophic relationships of this species, stomach analyses were performed on individuals caught ... individuals were examined and their stomach contents identified. The proportion of individuals found with ... sizes. This was hypothesised to result from fish caught in pots suffering reduced levels of trauma. The ...
Meeting Document : WG-FSA-00/25 : Author(s): G. Pilling, T. Daw, M. Purves, D. Agnew and J. Xavier (United Kingdom)