This study investigated the in vitro effects of the polyphenols resveratrol, mangiferin and (-)-epigallocatechin-3-gallate (EGCG) on the histiophagous ciliate Philasterides dicentrarchi, which causes fatal scuticociliatosis in farmed turbot Scophthalmus maximus L. Of the 3 polyphenols, resveratrol showed strongest antiprotozoal activity, reducing ciliate density after 1 wk culture by, on average, 91% at 50 microM, and 96% at 500 microM. EGCG reduced ciliate density by, on average, 93% at 500 microM, with no significant effect at 50 microM. Mangiferin reduced ciliate density by, on average, 56% at 500 microM, again with no significant effect at 50 microM. In view of these findings, we discuss the potential utility of chemotherapy with polyphenols as a strategy for the control of scuticociliatosis in farmed turbot.
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