2.5. Statistical analysis
A one-way analysis of variance, followed by Tukey's test (Zar, 2010) when necessary, was used for the comparison of treatments at the significance level of 0.05. Normality and homoscedasticity were assessed by the Shapiro–Wilk and Levene tests (Zar, 2010), respectively. Survival and volatile suspended solids were expressed as percentages, and angular transformation was applied to data prior to the analysis.