Journal Article

Analysis of size spectra off northwest Africa: a useful indicator in tropical areas?

Kim A. Stobberup, Cheikh A.O. Inejih, Sory Traoré, Carlos Monteiro, Patrícia Amorim and Karim Erzini

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 62, issue 3, pages 424-429
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.2005.01.014
Analysis of size spectra off northwest Africa: a useful indicator in tropical areas?

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Changes in the size spectra of demersal fish communities off Cape Verde (1988, 1994), Guinea (1985–1995), and Mauritania (1987–2001) were studied. Intercepts and slopes showed opposite trends for Guinea and Mauritania, but were relatively stable in spite of a strong increase in landings per unit area. For Cape Verde, there were marked changes in size structure, seemingly inconsistent with the more moderate fishing pressure there. Changes in size structure do not seem to be suitable indicators of the effects of fishing in areas characterized by faster growth rates, small sizes, high species diversity, and complex interrelationships, such as the tropics.

Keywords: ecosystem indicators; fishing effects; northwest Africa; size spectra

Journal Article.  2958 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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