The present study aims at determining the level of contamination of the jawfish (Chrysichthys nigrodigitatus) by organophosphate residues in the hydroelectric dams of Faé, Kossou and Taabo. Ninety (90) fish were collected from these three dams during eight sampling campaigns. Composite samples were formed, each for two fish. A total of forty-five (45) composite samples were formed. The detection of pesticide residues in the fish samples was determined by gas chromatography-mass spectrometer (GC/MS). The results show that the average total organophosphate residue load at the three dams is 0.184 mg/kg. The Faé hydroelectric scheme had the highest total load of 0.266 mg/kg in fish samples, compared to 0.197 mg/kg for Taabo and 0.089 mg/kg for the Kossou hydroelectric dam. The relatively high average total concentration is observed for parathion-methyl with a value of 0.130 ± 0.023 mg/kg. Chlorfenvinphos, with a total average concentration of 0.046 ± 0.007 mg/kg was the only molecule present in all the fish samples analyzed in the three hydroelectric dams. In addition, most of the molecules detected in the fish samples had concentrations that exceeded the Maximum Residue Limits (MRLs) for pesticides, whose values range from 0.01 to 0.05 mg/kg.
The smoking of fish plays a very important role at the economic, social and nutritional levels. Despite its importance, smoking is still practiced through traditional techniques that have a considerable impact on the health of the processors. The objective of this work is to evaluate the environmental and health impact of traditional and modern fish smoking. The environmental assessment of the Marcory Anoumabo site equipped with an improved oven called FAO-Thiaroye Processing Technique (FTT oven) consisted in measuring the quality of the smoke on the smoking sites. It is a cross-sectional etiological study conducted from July to December 2018 on a sample of 135 women consisting of 40 women who use traditional ovens, 32 women who use FTT ovens and 63 control cases. The results showed that 87.50% and 37.50% of women practicing on traditional ovens versus 43.75% and 15.62% of women using FTT ovens as well as 39.68% and 14.29% of the case controls had respiratory and ophthalmological signs respectively. The gas levels measured at the smoking sites are often higher than the standard (50 mg/m3). This study highlights the deleterious effects of fish smoking.
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