Data were submitted to one-way ANOVA followed by Tukey’s multiple range test; normality assumptions were ensured through the Kolmogorov–Smirnov test; homogeneity of variance was established through Bartlett’s test [16]. Data were expressed as the mean ± SD of the replicates, each tank representing one experimental unit. Differences were considered significant if P was less than 0.05. All statistical analyses were performed using SAS software