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ICES Journal of Marine Science: Journal du Conseil 2003 60(2):259-267; doi:10.1016/S1054-3139(03)00016-X
© 2003 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Biology of Ethmalosa fimbriata (Bowdich) and fish diversity in the Ebrie Lagoon (Ivory Coast), a multipolluted environment

B Guyonneta, C Aliaumea,*, J.-J Albaretb, C Casellasc, A Zerbia, G Lasserrea and T Do Chia

a Université Montpellier II, Laboratoire Ecosystèmes Lagunaires (UMR CNRS-UMII 5119) Case 093, Place E. Bataillon, 34095 Montpellier Cedex 5, France
b Centre IRD BP 1386, Dakar, Senegal
c Faculté de Pharmacie, Dept. Sciences de l'Environnement et Sante Publique Av. Charles Flahault, 34060 Montpellier, France

*Correspondence to C. Aliaume; tel: +33-467-144765; fax: +33-467-143719. e-mail: aliaume{at}crit.univ-montp2.fr.

The biology of the clupeid Ethmalosa fimbriata (Bowdich) was studied as a potential bio-indicator of pollution in three bays of the Ebrie Lagoon, an inter-tropical lagoon in the Ivory Coast (western Africa). Bietri Bay was the most impacted by Abidjan's industrial and urban waste, Cocody Bay was characterized by the presence of eutrophic water, and Sud Boulay Bay, located in a rural zone, was least impacted. Sizes at first maturity (fork length) of E. fimbriata were lowest in the most polluted bay (Bietri: 80.8 and 83.5 mm for males and females, respectively), higher in the intermediately polluted bay (Cocody: 125 and 137.5 mm, respectively), and highest in the unpolluted bay (Sud Boulay: 135 and 145 mm, respectively). Owing to its hardiness, E. fimbriata is the dominant species in polluted water, constituting more than 75% of the total number of fish caught. As a consequence, fish diversity decreased and the community was less structured in the polluted environment than in the unpolluted one.

Keywords: bio-indicator, DIMO model, Ethmalosa fimbriata, fish community, inter-tropical lagoon, pollution impact, size at first maturity

Received 5 July 2002; accepted 16 January 2003.


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