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Les resultats issus des analyses physico-chimiques et toxicologiques des eaux et des poissons du lac Nokoue nous ont permis de constater que les Hydrocarbures Aromatiques Polycycliques retrouves dans le lac influencent sensiblement la qualite des poissons et que les valeurs limites sont depassees pour certains parametres. Les valeurs de conductivite moyenne (2752 μS/cm) et de concentration moyenne des nitrites (7,78 mg/L) ont montre que les echantillons d’eau preleves sur le lac Nokoue sont pollues. Le dosage des polluants a permis de constater que les individus de Tilapia guineensis, Hemichromis fasciatus et de Sarotherodon melanotheron preleves dans les eaux du lac sont respectivement contamines a 10%, 18% et 10% au niveau de la riviere So a Dogodo, a 26%, 25% et 23% a Ketonou, 32%, 29% et 40% a 6 km de Domeguedji et 32%, 28%, 27% a l’embarcadere d’Abomey-Calavi. The results from physico-chemical and toxicological analyzes of the waters and fish of lake Nokoue have shown that the Polycyclic Aromatic Hydrocarbons found in the lake have a significant influence on the quality of the fish and that the limit values are exceeded for certain parameters. The mean conductivity and mean concentration values of the nitrites, estimated at 2752 μS / cm at 7.78 mg / L respectively, show that the water samples taken from lake Nokoue are polluted. The bioaccumulation factor revealed that individuals of Tilapia guineensis, Hemichromis fasciatus and Sarotherodon melanotheron taken from lake waters are respectively 10%, 18% and 10% contaminated at the So River level in Dogodo, at 26%, 25% and 23% at Ketonou, 32%, 29% and 40% at 6 km from Domeguedji and 32%, 28%, 27% at the Abomey-Calavi jetty.

Impacts des Hydrocarbures Aromatiques Polycycliques sur les poissons: Cas des Tilapias du lac Nokoué au Sud du Bénin (Afrique de l’Ouest)