The Lake Nokoué and Porto-Novo Lagoon complex represents the most important Lagoon system in Benin. It  Regarding the hydrological regime, a predominance of strictly freshwater taxa was noted during the High water period in Lake Nokoué. Furthermore, this predominance was recorded during both High and Low water periods within the Porto-Novo Lagoon. Thus, the variation of these taxa was found to be more pronounced in Lake Nokoué than in the Porto-Novo Lagoon.