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ABSTRACT
A study on the effect of water soluble fraction of pesticide on Anabena sp and Cylindrospermum sp, was carried out in the laboratory for fourteen days (14). The prepared concentration of water soluble fraction for the experiment were 0% (control) 5%, 10%, 20%, 30%, 40%, 50%. Samples were analyzed every two days for growth using spectrophotometer at a wavelength of 750nm as well as some physiochemical parameter. Inferential one-way analysis of variance (ANOVA), Duncan Multiple Replication (DMR) were done using Microsoft Excel 2010 and statistical package for social sciences (SPSS22). The result showed that different concentrations of water soluble fraction of pesticide affected the growth of the fresh water microalgae with optimal growth occurring at control (0%), 1%, 5% and 10% treatment, while 25% treatment had the highest percentage inhibition on both microalgae. Temperature, pH, Total Dissolved Solid (ppm), Conductivity µscm-1 and Chemical Oxygen Demand (mg/l) were recorded as follows; 30oC, 4.35, 450ppm, 685m/s and 9mg/l respectively. A decrease in Dissolved Oxygen, Chemical Oxygen Demand were observed in all concentration of the water soluble fraction of pesticide. Result also showed that the inhibitory effect of different concentration of WSF of pesticide was observed at higher concentration.
