This investigation was designed to compare between the inhibiting effect of sodium chloride and the rotifer Brachionus plicatilis on the growth of a fish pathogen, Saprolegnia parasitica as safe remediation techniques in aquacultures. The results showed that the addition of 100 cells of B. plicatilis, caused decrease in spores count of S. parasitica, by 34% after 2 hours, and 79% after 6 hours, respectively. Increasing the number of B. plicatilis to 150 cells decreased the spores count of S. parasitica by 80.00%. The two way analysis of variance showed that the tested rotifer species exhibited a great efficiency in grazing fungal zoospores (P
Key words: Saprolegnia parasitica, Sodium chloride, Brachionus plicatilis, Pathogenic inhibitors, Lake Edku
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