The aim of this study was to examine some biological aspects of Epiplatys chaperi sheljuzhkoi, in a habitat under the influence of urban wastewater in order to gather scientific information needed for better management and conservation of this resource. Four data collection campaigns, one per season, were carried out from January 2016 to December 2016. The standard length and mass of each specimen were taken. The length-mass relationship and the condition factor were analysed. The one-factor Student’s t test was used to check the significance of the difference between the theoretical and observed values of the allometry coefficient b. An analysis of the condition factor was performed. The size structure shows that individuals between 15 mm and 20 mm in standard length dominate the E. chaperi sheljuzhkoi population. The value of the allometric coefficient b (2.91) is lower than the theoretical value 3 (Student’s t-test, p ˂ 0.05). This indicates a negative allometric growth of E. chaperi sheljuzhkoi. The long dry season recorded the lowest average condition factor (Kc) (1.56 ± 0.61%). The highest value was recorded during the long rainy season (2.38 ± 0.27 %). The allometry coefficient shows that Epiplatys chaperi sheljuzhkoi develops more than in the river. These data form a necessary basis for the proper management and conservation of this aquatic ecosystem.

The fishing typology on the Buyo Lake Dam was studied monthly from July 2017 to June 2018. For this purpose, a questionary survey was administered to fishers, interviews were held with the lake managers and direct observations of the field were made. Fishing in this reservoir is of the artisanal type, practiced individually by Ivorians from non-Ivorians. A total, 215 fishermen were identified, including 70.7% Malians, 24.18% Ivorians and 5.12% Burkinabe. The fishing activity is dominated by fishermen of Bozo ethnicity from Mali (67.91%). Fishing is mostly practiced by adults ranging in age between 30 and 45 years and includes both professional fishermen and occasional. Most actors have no level of study. Only 11.54% of Ivorians have a primary level while 9.2% of non-Ivorians have done Koranic school. Gillnets are the most used catching gear. The low level of education of fishermen and the meshes below the standard they use are a real obstacle to the sustainable management of fisheries resources.