The quality of the water from the aquatic ecosystem, Carja, through the biological indexes.

The objective of this paper is to evaluate organic pollution in the basin growth cyprinids (Balta Mare) of farm Carja 1 Vaslui county, it was based on the two indices, namely algal genus pollution index and saprobes’ index. Algae as a component of the aquatic ecosystem is an indicator of water quality, which is determined by the component species and of their diversity. Total 18 genera and 29 species have been indentified, among these 13 species belonged to Cholorophyceae, 5 species to Cyanophyceae, 5 species to Bacillariophyceae, 5 species Euglenophyceae and 1 species to Dinophyceae. Have also been analyzed and the main physic-chemical parameters as follows temperature, pH, oxygen and the other parameters (nutrients viz. nitrogen and phosphorous). The Values of physic-chemical parameters show that water belongs to class III of quality, according to Order 161/2006. Two biological indices, viz. algal genus pollution index and saprobes’ index, were adopted to classify the water quality in the Balta Mare in comparison with the measured physicochemical water quality. The total score of Algal Genus Pollution Index of station CI, CII, CIII, CIV, CV, CA/E were 15, 15, 17, 8, 7 and 9 respectively. Water quality ecosystem investigated is assigned to the I² mesosaprobic subarea, prevailing the I²-mesosaprobic species, class III of quality and moderately polluted water.