The aim of this study was to investigate the level of Pb, Zn, Cu, Fe and Cd concentrations in various aquatic invertebrate species; Two classes of invertebrate were caught and identified {i.e. three (3) Mullusc: Bivalvia, Turbonilla and Monodonta while the other class are (2) Arthropods:Dysticus and lethocerus americana.} from the Ajiwa Dam at the three (3) Sampling stations using atomic Absorption Spectrophotometry (AAS) method. The result obtained showed that Fe had the highest concentration with average of 0.212mg/g and Pb which has the lowest concentration with 0.051mg/g. The study revealed the accumulation of Zn, Fe, Cu, Cd and Pb by aquatic invertebrates from Ajiwa Dam. The concentration of metals are Fe>Cu>Zn>Cd>Pb while their mean values were 0.04032mg/g, 0.0122mg/g, 0.02266mg/g, 0.0110mg/g and 0.0092mg/g respectively.
