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ICES Journal of Marine Science: Journal du Conseil 2005 62(3):511-515; doi:10.1016/j.icesjms.2004.11.008
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© 2005 International Council for the Exploration of the Sea

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

Sergio Ragonesea,*, Gaia Morizzoa, Alberto De Santia and Marco L. Bianchinib

a Marine Living Resources Assessment Group (MaLiRA-Group), IAMC–CNR, Section of Mazara del Vallo Via Luigi Vaccara 61, 91026 Mazara del Vallo (TP), Italy
b MaLiRA-Group, CNR, and Montalbano SpA 16100 Genova, Italy

*Correspondence to S. Ragonese: tel: +39 0923 948966; fax: +39 0923 906634. e-mail: sergio.ragonese{at}irma.pa.cnr.it.

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

Received 1 April 2004; accepted 14 October 2004.


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