Résultats de la recherche
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A post-processing method to remove interference noise from acoustic data collected from Antarctic krill fishing vessels
from Antarctic krill fishing vessels Abstract / Description: The use of fishing-vessel-based acoustic ... data has been recognised as an important way to estimate the distribution and relative abundance of ... Antarctic krill (Euphausia superba), yet the quality and even the utility of the data may be seriously ... degraded by interference noise due to the lack of synchronisation of the acoustic instruments found on some ... data collected from Antarctic krill fishing vessels X. Wang Ocean University of China Qingdao ... 266100 People’s Republic of China and Key Laboratory for Sustainable Development of Marine Fisheries ... Ministry of Agriculture Yellow Sea Fisheries Research institute Chinese Academy of Fishery Sciences ... Qingdao 266071 People’s Republic of China J. Zhang Key Laboratory for Sustainable Development of ...
Science Journal Paper : CCAMLR Science, Volume 23 (CCAMLR Science, Volume 23) : 17–30 : Auteur(s): Wang, X., J. Zhang and X. Zhao
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Can we satisfactorily estimate variation in krill abundance?
: Knowledge of abundance and rates of change of abundance are basic requirements for fisheries models. Catch ... of abundance. It is less satisfactory for pelagic fisheries. Evidence is given that CPUE estimated ... from data reported to the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR ... ) does not provide a realistic index of krill abundance. Recognising that there is a large natural year ... SATISFACTORILY ESTIMATE VARIATION IN KRILL ABUNDANCE?* I. Everson1 (United Kingdom) Abstract Knowledge of ... abundance and rates of change of abundance are basic requirements for fisheries models. Catch per unit ... effort (CPUE) has traditionally been used in demersal fisheries assessments as an estimator of ... reported to the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) does not ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 375-376 : Auteur(s): Everson, I.
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Statistical problems in krill stock hydroacoustic assessments
: Two primary issues are at question for hydroacoustic assessments of krill. The first is the methods ... applied to establish biomass in a survey area and the second is the improvement in accuracy of target ... -strength measurements. In the case of statistical methods, there are no clear guidelines for deciding what ... does not invalidate the use of available methods to conduct surveys and analyze results. In the case of ... assessments of krill. The first is the methods applied to establish biomass in a survey area and the second ... is the improvement in accuracy of target-strength measurements. In the case of statistical methods ... well addressed by present techniques. However, this does not invalidate the use of available methods ... to conduct surveys and analyze results. In the case of target-strength accuracy, even if the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 301–309 : Auteur(s): Macaulay, M.C.
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Krill population biology during the 1991 Chilean Antarctic krill fishery
/ Description: Population biology of Antarctic krill, Euphausia superba, was studied from samples taken in 1991 ... size from 1.5 to 3 cm). Two subsamples of 100 specimens each were taken from 50 samples and analysed ... . The fishing ground was divided into two areas: Area A, north of the South Shetland Islands; and Area B ... , north of Elephant Island. The samples were grouped by time of capture: daytime, twilight and night-time ... biology of Antarctic krill, Euphausia superba, was studied from samples taken in 1991 during krill ... from 1.5 to 3 cm). Two subsamples of 100 specimens each were taken from 50 samples and analysed. The ... fishing ground was divided into two areas: Area A, north of the South Shetland Islands; and Area B, north ... of Elephant Island. The samples were grouped by time of capture: daytime, twilight and night-time ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 223–235 : Auteur(s): Mujica R., A., E. Acuña S. and A. Rivera O.
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Brief comments on the simulation study made by Professor Butterworth on krill fishing by an individual Japanese trawler
questions are raised concerning the simulation study of the Japanese krill fishery carried out by ... during FIBEX surveys. Since very little searching time is spent on layers, the utility of searching time ... data appears doubtful. Secondly, the utility of indices based on the sum of primary and secondary ... searching times (PST+SST) is also doubtful because SSTs are markedly dependent upon the type of products ... Abstract In this paper, three essential questions are raised concerning the simulation study of the ... is spent on layers, the utility of searching time data appears doubtful. Secondly, the utility of ... indices based on the sum of primary and secondary searching times (PST +SST) is also doubtful because ... SSTs are markedly dependent upon the type of products being produced, and the demand for each product ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/6 (Selected Scientific Papers, SC-CAMLR-SSP/6) : 347–350 : Auteur(s): Ichii, T. and Y. Endo
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Sea-surface temperature and krill catches around South Georgia in December–February 1989–1991 and 1999–2001
1989–1991 and 1999–2001 Abstract / Description: Monitoring of sea-surface temperatures (SSTs) in ... further analysis of SST maps, provides continuous information on hydrological conditions in the area ... . Analyses of the data at the beginning of each summer season could enable us to evaluate the potential for ... conducting a krill fishery in the area during the entire year. The reliability of these forecasts could be ... – sst.ocean@g23.relcom.ru Abstract Monitoring of sea-surface temperatures (SSTs) in Subarea 48.3, which ... of SST maps, provides continuous information on hydrological conditions in the area. Analyses of ... the data at the beginning of each summer season could enable us to evaluate the potential for ... conducting a krill fi shery in the area during the entire year. The reliability of these forecasts could be ...
Science Journal Paper : CCAMLR Science, Volume 9 (CCAMLR Science, Volume 9) : 165–174 : Auteur(s): Vanyushin, G.P
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Modelling krill recruitment
observed values of the mean proportion of recruits and its variance to model recruitment in a krill ... population in terms of numbers of recruits. The method includes the calculation of natural mortality and ... for generating families of recruitment functions which are consistent with the statistical uncertainty ... , Australia Abstract A method is developed for using observed values of the mean proportion of recruits ... and its variance to model recruitment in a krill population in terms of numbers of recruits. The ... method includes the calculation of natural mortality and other parameters consistent with the observed ... proportional recruitment parameters. A procedure is given for generating families of recruitment functions ...
Science Journal Paper : CCAMLR Science, Volume 1 (CCAMLR Science, Volume 1) : 49–54 : Auteur(s): W.K. de la Mare
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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 ... calculating asymptotic confidence intervals for 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 ... 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
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Fish stock assessment survey in Subarea 48.3
fish survey in the vicinity of South Georgia, CCAMLR Subarea 48.3, is described. Details are given of ... positions of hauls, catch rates and size composition of catches. The standing stock of one of the most ... Abstract A demersal fish survey in the vicinity of South Georgia, CCAMLR Subarea 48.3, is described ... . Details are given of positions of hauls, catch rates and size composition of catches. The standing stock ... of one of the most important commercial species in the area, Champsocephalus gunnari, is shown to ... los lances, indices de capturas y composici6n por talla de las capturas. Al comparar la poblaci6n ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 25–67 : Auteur(s): Everson, I., G. Parkes, K.-H. Kock, S. Campbell, Z. Cielniaszek and J. Szlakowski
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Species identification and age estimation for the ridge-scaled macrourid (Macrourus whitsoni) from the Ross Sea
whitsoni) from the Ross Sea Abstract / Description: Samples of macrourid rattail by-catch from the ... Zealand for subsequent confirmation of their identity by researchers from the National Institute of Water ... the geographic source of the aged sample. Counts of translucent zones were made from baked and cross ... -sectioned otoliths of the ridge-scaled macrourid (M. whitsoni) sampled from the commercial longline fishery ... (MACROURUS WHITSONI) FROM THE ROSS SEA P. Marriott National Institute of Water and Atmospheric Research ... , Wellington New Zealand Abstract Samples of macrourid rattail by-catch from the toothfi sh fi shery in the ... confi rmation of their identity by researchers from the National Institute of Water and Atmospheric ... source of the aged sample. Counts of translucent zones were made from baked and cross-sectioned ...
Science Journal Paper : CCAMLR Science, Volume 10 (CCAMLR Science, Volume 10) : 37–51 : Auteur(s): Marriott, P., P.L. Horn and P. McMillan