1. Laboratory of Ecosystems and Fisheries Resources, University of Douala, Douala, Cameroon; Research Unit in Process Engineering and Environmental Engineering, University of Antananarivo, Antananarivo, Madagascar
2. Department of Earth Sciences, University of Douala, Douala, Cameroon
3. Laboratory of Ecosystems and Fisheries Resources, University of Douala, Douala, Cameroon
4. Research Unit in Process Engineering and Environmental Engineering, University of Antananarivo, Antananarivo, Madagascar