N’ZI Konan Gervais¹, BODJI Iridjé Marcelle^1,

The present study was conducted on 180 specimens of Macrobrachium vollenhovenii sampled from May to October 2019 respectively in the Bandama River in freshwater and in the Grand-Lahou Lagoon in brackish water. The nutritional analysis of the flesh showed that this species is an excellent source of protein and humidity with low lipid contents. The high ash content is related to heavy metals and pesticide residues found in the shrimp meat. The determination of heavy metals (Cd, As, Pb, Hg) by SAA in the Macrobrachium flesh showed that in freshwater and lagoon shrimp, have average concentrations of Arsenic (As) higher than the standard for all shrimp sampled while those of lead and mercury are in accordance with the standards of the FAO and WHO. As for the average concentrations of Cadmium, 40% of the shrimp analyzed in freshwater have levels above the standard against 6.67% of shrimp in brackish water. The study of the distribution and concentration of pesticide residues in the flesh of freshwater and lagoon shrimps showed the presence of 4 families (Herbicides, Rodenticides, Triazines and Organophosphates) of these molecules with the predominance of Herbicides. All the families of pesticides studied are represented in the flesh of freshwater shrimps against two families (Herbicides and Triazines) in brackish water shrimps. The analysis of the concentrations showed a high concentration of Rodenticides in freshwater shrimp compared to the concentrations of the other families studied in both environments.

nutritional quality, heavy metals, pesticides, shrimps, freshwater and brackish water