Zobrazeno 1 - 10
of 49
pro vyhledávání: '"E.J. Simmonds"'
Publikováno v:
ICES Journal of Marine Science. 61:201-210
During acoustic surveys for biomass estimation, fish aggregations near the seabed may not be correctly measured due to false detection of the bottom echo. The extent of this problem depends on the spatial and density features of the near-seabed aggre
Autor:
E.J Simmonds
Publikováno v:
ICES Journal of Marine Science. 60:463-471
Acoustic surveys are used in 20 stock assessments within the ICES community, and almost all as relative indices of abundance, but little has been done to explore their performance in detail. The North Sea herring acoustic survey started in 1979 and b
Autor:
James L. Anderson, E.J. Simmonds, Ralf Döring, A. Abella, Eskild Kirkegaard, H. Dörner, Jesper L. Andersen, C. Stransky, J. Casey, Massimiliano Cardinale, A. Motova
We analysed the development of the status of 41 commercially exploited fish stocks from the North East Atlantic, North Sea and Baltic Sea (FAO Area 27) and the economic performance of the fleets exploiting those stocks. The analyses indicate that the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b5e425c08741a0358af07e62b2ff9684
http://publications.jrc.ec.europa.eu/repository/handle/JRC70760
http://publications.jrc.ec.europa.eu/repository/handle/JRC70760
Autor:
E.J. Simmonds, Paul G. Fernandes
Publikováno v:
geoENV I — Geostatistics for Environmental Applications ISBN: 9789048148615
A log backtransformed variogram was used to provide a robust estimation of the experimental variogram in the presence of highly skewed data, such as those obtained in fisheries acoustic surveys. Simulations based on North Sea herring surveys were car
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cc0bb88abeca2f3b5cb6a12b73e20edd
https://doi.org/10.1007/978-94-017-1675-8_37
https://doi.org/10.1007/978-94-017-1675-8_37
Publikováno v:
Lancet (London, England). 335(8699)
Autor:
Frederick Armstrong, P. Stevenson, N.W. Millard, Paul G. Fernandes, E.J. Simmonds, M. Squires, Stephen D. McPhail, Andrew S. Brierley
Publikováno v:
Nature. 407:152-152
The precarious condition of the world's fisheries is making ever-greater demands of the scientific assessment of fish stocks. Traditional assessments that rely on commercial catch statistics can have major shortcomings1 (as shown, for example, by the
Autor:
E.J. Simmonds
Publikováno v:
Journal of Sound and Vibration. 97:117-128
An accurate knowledge of transducer equivalent beam angles is vital to the proper application of echo-integration techniques to fish stock assessment and to the measurement of fish target strength. Ceramic transducers manufactured by Simrad, Norway,
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Akademický článek
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