Résultats de la recherche
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Target strengths of krill at 136 and 20 kHz
. Ensonification of encaged live krill. For aggregations with mean lengths from 45 to 50 mm the mean single-krill ... . At the same frequency for aggregations with mean lengths in the range 41 to 47 mm the mean single ... -krill target strength is in the range-76 to-81 dB. File: 08-Kasatkina.pdf ... the mean single-krill target strengths range from-71 to-77 dB at 20 kHz. Trawl hydroacoustic method ... . Mean length of specimens was 49.9 mm and mean weight was 0.814 g. Males were dominant in the catches ... metal frame in the shape of a truncated pyramid. The hydroacoustic transducer connected to the impulse ... difraction zone in the area being measured and the optimal ratio of target sizes to the transducer size ... • hydroacoustic transducer (piezoceramic) • width of directional diagram at 3 dB - 10°. The cage was cubic in ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 141–157 : Auteur(s): Kasatkina, S.M.
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Measurements of fish school velocities with an acoustic Doppler current profiler
), it was required that the four ADCP beams simultaneously insonified a fish school, in the same depth ... estimates and ensemble averaged to determine the average speeds and directions of fish aggregations. The ... results suggests that the ADCP can be a useful tool for observing fish behavior in certain situations ... . Some applications may include the quantification of horizontal and vertical migration patterns of large ...
Meeting Document : WG-EMM-96/41 : Auteur(s): Demer, D.A.
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On possible impact of new continuous krill fishing technology on juvenile fish and larvae
fishing technology may result in considerable by-catch of the juvenile fish and larvae in krill fishery ... powerful pumping system for continuous pumping the catch out of the trawl bag. It was discussed the ... Abstract: The new continuous krill fishing system uses both a small-meshed midwater trawl and a ... potential threats of new technology to Antarctic marine ecosystem. It was shown that application of this ...
Meeting Document : WG-FSA-06/23 : Auteur(s): S.M. Kasatkina
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Synopsis of CEMP and non-CEMP predator parameters from Admiralty Bay and Cape Shirreff, South Shetland Islands, Antarctica: their relationships to krill abundance and ice cover, 1978–2003
. Results of the analyses are presented in a series of 6 Tables, following the outline of a Draft paper by ... , South Shetland Islands, Antarctica were analysed to assess the characteristics of the individual ... K.Reid for similar analyses at South Georgia. The tabular data include: 1. Table 1. A list of the penguin ... performance indices collected at the two sites 2. Table 2. Data on annual variability in krill biomass density ...
Meeting Document : WG-EMM-03/61 : Auteur(s): W.Z. Trivelpiece (USA), K. Salwicka (Poland) and S.G. Trivelpiece (USA)
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Modelling crustacean fisheries: effects of parasites on management strategies
Abstract: The reproductive performance of commercially important crustaceans may be considerably ... ;open" or "closed" depending on the behavior of planktonic larvae, the duration of these ... planktonic stages, and the flush rate of the environment of the adult host. Both hosts and parasites may have ... open or closed larval recruitment. We developed mathematical models to investigate the impact of ...
Meeting Document : WS-CRAB-93/09 : Auteur(s): A.M. Kuris and K.D. Lafferty (USA)
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Growth and natural mortality of Patagonian rockcod (Patagonotothen guntheri shagensis) from Shag Rocks shelf
-weight data of research and fishery survey cruises in the Shag Rocks area from 1978 to 1986. The natural ... of natural mortality M=0.8 was used in calculations and the optimal age and length for harvesting ... mortality rate was assessed by six different methods and was within a range of 0.63 to 1.06. The mean value ... shagensis) from Shag Rocks shelf Abstract / Description: The parameters of Bertalanffy’s growth equation ... within a range of 0.63 to 1.06. The mean value of natural mortality M=0.8 was used in calculations and ... P.g. shagensis before the beginning of fishing is shown in Figure 2. The mean age of fish was ... Resources of the Atlantic Ocean. M., Nauka. pp. 276-286 (In Russian). 117 Table 1: Mean length of P.g ... calculated by using age and length-weight data of research and fishery survey cruises in the Shag Rocks ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 111–121 : Auteur(s): Shlibanov, V.I.
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Deaths of Adélie penguins at Mawson November–December 2001 investigated
near Mawson between 23 November and 4 December, 2001. It is concluded the most likely cause of death ... death of the penguins suggested initially that disease may have been implicated and so investigations ... were treated accordingly. The sampling protocols developed by CEMP were used in these investigations ... Abstract: Over 120 adult Adélie penguins were found dead in unusual circumstances on Welch Island ...
Meeting Document : WG-EMM-02/42 : Auteur(s): K. Kerry and L. Irvine (Australia)
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A versatile approach to minimise damage or loss of longline gear due to sea-ice
quickly varying sea ice cover, there is an increased risk that any parts of longline gear floating on the ... informs FSA about the very successful experience gained by the Alfred Wegener Institute in using pop-up ... buoy recovery systems for short-term deployment of scientific instruments on the sea floor and invites ... FSA to: (1) to (re-)discuss the issue of damage or loss of longline gear due to sea ice, including the ...
Meeting Document : WG-FSA-2019/04 : Auteur(s): S. Hain, T. Brey and K. Teschke
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Can we use discriminant function analysis to sex penguins prior to calculating an index of a morphometric parameter?
functions are able to correctly determine the sex of birds with greater than 80% success the difference ... . Combining all data for both sexes is considered as a procedure for avoiding the necessity of sex ... determination, but uncertainty in sex ratios can lead to considerable Type I and Type II errors. Lack of ... knowledge about the sex ratio between years makes combining the data a very doubtful procedure and use of a ...
Meeting Document : WG-CEMP-92/11 : Auteur(s): D.J. Agnew (Secretariat)
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Can we use discriminant function analysis to sex penguins prior to calculating an index of a morphometric characteristic?
avoiding the necessity of sex determination. However, uncertainty in sex ratios can lead to considerable ... index of a morphometric characteristic? Abstract / Description: In sexually dimorphic species ... discriminant analysis can be used to determine the sex of individuals, it is only able to correctly sex a ... using discriminant analysis. When discriminant functions are able to correctly determine the sex of ... expressed in terms of the true mean and standard deviation: ~1 = ~ - ca for females, ~3 =~' + ca for ... , take the case of body weight in Table 2. Taking the expected combined mean to be halfway between the ... = 0.021 from equation 6. Therefore, if we observe a change in the mean of 10%, 2.1 % of this may be due ... used to indicate that there was a change in the combined mean of the characteristic, as it may have ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 259–272 : Auteur(s): Agnew, D.J.