Résultats de la recherche
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CCAMLR-XXVII/19, Annex I
risk assessment is presented in support of the preliminary assessment of bottom fishing activities in ... 2008-2009 for New Zealand: implementing Conservation Measure 22-06 (Bottom Fishing in the Convention ... monitoring, clarification of research requirements, and a robust approach to precautionary management of the ... effects of fishing where information is incomplete or uncertain (Waugh et. al. 2008). The ecological risk ... . They are also not available for the indicator taxa of stalked crinoids or basket stars. Finally, no ... pulled wide of the straight-line distance between the grapnels. However if there is no current the line ... no movement. For purposes of calculating the spatial footprint of a standard set, the workshop ... assumed no movement of this section of line. The workshop agreed after much discussion that the ...
Document : Site Section: Publications
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Detection and quantitative estimation of krill concentrations by hydroacoustic instruments
instruments Abstract / Description: The limited capabilities of existing hydroacoustic instruments in ... in areas surveyed. The task of detecting surface concentrations of krill can be solved with the help ... of towed acoustic antennae. The practical possibility of detecting dispersed krill by hydroacoustic ... instruments was established on board the research vessel Odissey during the international expedition under the ... condition ensures reliable reception and registration by the recorder and integrator of no less than one ... ESTIMATION OF KRILL CONCENTRATIONS BY HYDROACOUSTIC INSTRUMENTS K.I. Yudanov (U.S.S.R.) Abstract The ... concentrations of krill lead to considerable underestimates of krill biomass in areas surveyed. The task of ... detecting surface concentrations of krill can be solved with the help of towed acoustic antennae. The ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 123-139 : Auteur(s): Yudanov, K.I.
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Midwater trawl catchability as an aspect of a quantitative assessment of krill biomass conducted using a trawl census survey
variable which depends on both the behavioural and distributional characteristics of the target species and ... midwater trawls and small research trawls, in this case using an Isaacs-Kidd trawl, demonstrated the ... futility of using the latter for trawl census survey biomass assessments due to their highly variable ... catchability over the survey area and also because the biomass estimates thus obtained were characterised by ... contains no errors, the relative error in the biomass estimate from formulas 1 and 2 will be calculated as ... catchability no less than ~ x(P) = 0.1, it would be necessary to carry out over the study area 20 hauls with a ... . Kasatkina* Abstract Midwater trawl catchability is a variable which depends on both the behavioural and ... distributional characteristics of the target species and trawl parameters. Reliability of biomass assessments ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 257–272 : Auteur(s): Kasatkina, S.M.
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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 ... the mean single-krill target strengths range from-71 to-77 dB at 20 kHz. Trawl hydroacoustic method ... . For aggregations with mean lengths from 47 to 50 mm the mean target strengths ranged from-71 to-75 dB ... . At the same frequency for aggregations with mean lengths in the range 41 to 47 mm the mean single ... in order to guarantee that the cage had become completely saturated and that there was no air ... . 1985. Report of the Post-FIBEX Workshop in August 1984. BIOMASS Report Series No. 40. ANON. 1986 ... No.ofKriU TS (cage + krlll), Krill Krill Parameters No. in the Cage dB TS,dB L (mm) sd P 1 100 -45.99 ... aggregations with mean lengths from 45 to 50 mm the mean single-kriU target strengths range from -68 to -69 dB ...
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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Acoustic data analysis and models of krill spatial distribution
/ Description: Acoustic data obtained on 4-5 January 1987 aboard the R/V Professor Siedlecki were used in three ... (spatial autocorrelation of krill biomass) and the frequency distribution of krill biomass estimate. The ... wavenumber spectrum resembles a white noise at scales of 2-20 km, although at scales smaller than 1 km the ... spectrum appears to lose its power significantly. The semivariance of biomass does not vary significantly ... obtained on 4-5 January 1987 aboard the RN ProfesSor Siedlecki were used in three descriptors of krill ... autocorrelation of krill biomass) and the frequency distribution of krill biomass estimate. The wavenumber ... spectrum resembles a white noise at scales of 2-20 km, although at scales smaller than 1 .km the spectrum ... appears to lose its power significantly. The semivariance of biomass does not vary significantly over ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 311–329 : Auteur(s): Morin, A., A. Okubo and K. Kawasaki
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e-cc-iii-aE.pdf
... Committee and the Commission and no data of this type has been received by the Secretariat so far in 1984 ... e-cc-iii-aE.pdf CC84annE.doc ANNEX E REPORT OF THE ... STANDING COMMITTEE ON ADMINISTRATION AND FINANCE 1. The Committee met on 5, 6, and 7 September 1984 ... under the Chairmanship of Mr Martinez-Castro of Argentina to consider the following items: 1. Report
application/pdf attached to:SCAF-84
Meeting Report : SCAF-84
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Growth and natural mortality of Patagonian rockcod (Patagonotothen guntheri shagensis) from Shag Rocks shelf
shagensis) from Shag Rocks shelf Abstract / Description: The parameters of Bertalanffy’s growth equation ... -weight data of research and fishery survey cruises in the Shag Rocks area from 1978 to 1986. The natural ... mortality rate was assessed by six different methods and was within a range of 0.63 to 1.06. The mean value ... of natural mortality M=0.8 was used in calculations and the optimal age and length for harvesting ... ROCKCOD (PATAGONOTOTHEN GUNTHERI SHAGENS/S) FROM SHAG ROCKS SHELF V.1. Shlibanov Abstract The ... calculated by using age and length-weight data of research and fishery survey cruises in the Shag Rocks ... area from 1978 to 1986. The natural mortality rate was assessed by six different methods and was ... within a range of 0.63 to 1.06. The mean value of natural mortality M=0.8 was used in calculations and ...
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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Potential interactions between wandering albatrosses and longline fisheries for Patagonian toothfish at South Georgia
Patagonian toothfish at South Georgia Abstract / Description: We examine the extent of overlap between South ... May and October (main chick-rearing period). However during the chick-brooding period, from March ... through mid-May, adult birds of both sexes spend most of their time at sea over the South Georgia ... continental shelf in areas very similar to where the longline fishery operates and are therefore at serious ... transit to or from their breeding site at Bird Island. Therefore, during the post-brood chick-rearing ... and from the breeding site) was associated with the Patagonian Shelf, particularly slope areas over ... Cross, Madingley Road Cambridge CB3 OET United Kingdom Abstract We examine the extent of overlap ... ) and between late May and October (main chick-rearing period). However during the chick-brooding ...
Science Journal Paper : CCAMLR Science, Volume 3 (CCAMLR Science, Volume 3) : 101–110 : Auteur(s): Croxall, J.P. and P.A. Prince
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e-cc-xvii-a4.pdf
... appropriate. CCAMLR Site on the World Wide Web 11. The Committee received the advice of the Executive ... Secretary on the progress towards establishing a site on the World Wide Web (the web), as presented in ... CCAMLR-XVII/BG/23. It encouraged the continued development of the site and considered that the Commission ... ) Publications (ii) Scientific Committee Budget 7. CCAMLR Site on the World Wide Web 8. Management Review of
application/pdf attached to:SCAF-98
Meeting Report : SCAF-98
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Estimating confidence intervals for fish stock abundance estimates from trawl surveys
estimates of abundance obtained from trawl surveys conducted by means of the swept area method, using ... likelihood ratios from Aitchison's delta distribution. Simulation tests of the method show that unbiased ... estimates of density and biomass can be obtained and that the estimated confidence intervals have close to ... the nominal coverage probability. Performance deteriorates in cases where few of the hauls contain ... by means of the swept area method, using likelihood ratios from Aitchison's delta distribution ... . Simulation tests of the method show that unbiased estimates of density and biomass can be obtained and that ... the estimated confidence intervals have close to the nominal coverage probability. Performance ... deteriorates in cases where few of the hauls contain fish and the coefficient of variation (CV) is high. The ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 203–207 : Auteur(s): de la Mare, W.K