||Objective: To carry out a physicochemical characterization of the waters of the Sô River in order to provide
basic elements for future ecological modeling of the system.
Methodology and Results: Data were collected monthly between June 2015 to November 2016 at twelve
sampling stations. Sixteen physico-chemical parameters, eight in situ (temperature, pH, transparency, depth,
salinity, dissolved oxygen, electrical conductivity and Dissolved Total Solids) and eight physico-chemical
parameters (NTK, NO2-, NO3-, NH4+ , PO43- PO43-total, Ca2+ and Mg2 +) were measured. The Kruskal Wallis
and SNK test, correlation matrix, Ascending Hierarchy Classification (HCA) and Principal Component Analysis
(PCA) were applied to all measured parameters. The results identified four groups of stations with 80%
dissimilarity. Group 1, consisting of the stations of the lower course, contains highly mineralized waters, groups
2 and 3 consisting of the stations of the middle course, show a nitrogenous and phosphorous pollution and the
group 4 consisting of the stations of the upper course of the river presents the characteristics of very well
oxygenated waters and favorable to the growth of aquaculture species.
Conclusions and applications : the upstream part of the Sô River has waters for good fish productivity while the
downstream and middle courses present waters with high levels of nitrogen and phosphorus compounds
disrupting the biotope, which could create an imbalance in fauna aquatic. These results provide basic data for
the implementation of a sustainable management plan for the river and its watershed.