Journal Article

Rapid-response indicators of changes in resource state based on Mediterranean bottom-trawl surveys

Sergio Ragonese, Gaia Morizzo, Alberto De Santi and Marco L. Bianchini

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 62, issue 3, pages 511-515
Published in print January 2005 | ISSN: 1054-3139
Published online January 2005 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1016/j.icesjms.2004.11.008
Rapid-response indicators of changes in resource state based on Mediterranean bottom-trawl surveys

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  • Marine and Estuarine Biology

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The authors propose a method for developing operational indicators of resource state, with an example based on a set of eight variables (mean abundance index in weight, mean body weight, median length, sex ratio, sex ratio by selected length class, mean and median female length-at-maturity, and percentage of females at maturity) derived from surveys conducted in the Strait of Sicily (central Mediterranean Sea, 1994–2002) for six target species. The method combines univariate (kite diagrams, sphere displacement plots) and multivariate techniques (multi-dimensional scaling).

Keywords: bottom-trawl surveys; indicators; Mediterranean; multispecies fisheries

Journal Article.  2359 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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