2.3 Data analysis
The mean of freshwater snails from each sampling site was calculated to give months as well as total values. Percentages were used to express frequency of distribution of freshwater snails in respect of species and sampling sites. One-way Analysis of Variance (ANOVA) was calculated to show significant difference between distribution and abundance of the freshwater snails across sampling sites. Similarly, ANOVA was used to show the significant difference between physico-chemical factors and the sampling sites. Pearson’s Correlation Coefficient was determined to show the direction (positive or negative) and magnitude (weak, moderate or strong) of the relationship between snail population and physicochemical factors. The level of significance was determined at 5% (P ≤ 0.05) and 95% confidence limit.