Abstract
The invitro antiparasitic effect of polyphenol tannic acid (TA) on Ichthyophthirius multifiliis theronts and tomonts was evaluated. In vitro antiparasitic assays revealed that TA in a dose- and time-dependent pattern through the damage of parasite plasma membrane could be 100% effective against I. multifiliis theronts at concentrations of 8 and 11ppm during all the exposure times (45-270min). The tomonts proliferation was completely inhibited by penetrating TA (at least 15ppm for 22-hr exposure) into encysted tomont across the cyst wall. However, 10ppm TA could result in a ninefold decrease in the population of live tomonts compared to the control group (p<0.05). Although at theront concentrations of over 6,000 per zebrafish (Danio rerio), a 100% prevalence of ichthyophthiriasis during a 5-day exposure was recorded, results of invivo tests showed that the parasite that pretreated up to 10ppm TA for 70min had not any capability to infect the studied zebrafish population. The acute toxicity (96hr-LC50 ) of TA for zebrafish was 19.51ppm. Thus, TA can be considered as a natural therapeutant to safely and efficiently improve the health of aquatic systems by controlling ichthyophthiriasis.
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