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ICES Journal of Marine Science: Journal du Conseil 2005 62(3):424-429; doi:10.1016/j.icesjms.2005.01.014
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© 2005 International Council for the Exploration of the Sea

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

Kim A. Stobberupa,*, Cheikh A.O. Inejihb, Sory Traoréc, Carlos Monteirod, Patrícia Amorima and Karim Erzinie

a Instituto Nacional de Investigação Agrária e das Pescas (INIAP-IPIMAR) Av. Brasília, 1449-006 Lisboa, Portugal
b Institut Mauritanien de Recherches Océanographiques et des Pêches B.P. 22, Nouadhibou, Mauritania
c Observatoire National des Pêches, Centre National des Sciences Halieutiques de Boussoura BP 3738/39, Conakry, Guinée
d Instituto Nacional de Desenvolvimento das Pescas C.P. 132, Mindelo, Cape Verde
e Centro de Ciências do Mar, Universidade do Algarve 8000-117, Faro, Portugal

*Correspondence to K. A. Stobberup: tel: +351 21 3027119; fax: +351 21 3015948. e-mail: karaujo{at}ipimar.pt.

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

Received 1 April 2004; accepted 3 December 2004.


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