Condition factor showed high variations (p˂0.05) between climatic seasons in S. Results indicated that the global condition factor including both climatic seasons was significantly higher in S. Means of condition factor were determined for the four climatic seasons that characterize the study site. Samplings were performed by experimental fishing using gillnets. Fish populations were sampled monthly during one year from July 2014 to June 2015. intermedius in the estuarine system of Aghien Lagoon. We studied changes in condition factor (CF) of two fish species belonging to the genus Schilbe: Schilbe mandibularis and S. Erosion spreading of this bar is the result of the combination of these factors in additional to the entropic effects. Between 19, the mouth of Bandama’s river has migrated about 1800 m with an average speed of 30.5m / year or 2.5 m /month.Littoral drift, caused by the obliquity of the swell in relation to the shore. In flood period, the west bank of the channel is attacked simultaneously by waves and river flow destroying thisbar thus,That causes the channel migration westward. We distinguish essentially two types of morphologies: In low water period, is built a littoral arrow that extends the bar from the East to the West. The analysis of air-photography and satellite picture make possible to track the migration and morphological evolution of the mouth. Seasonal measurements of salinity, make possible to schematize the evolution of the tide and the salinity in the estuary. This morphological variation is accompanied by the migration of the channel toward the west destroying progressively the historic town of Grand-Lahou. The morphology of Bandama’s mouth varies continuously depending tides, storms, river flow and seasons.

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