In vitro Investigation of Short-Term Antiparasitic Effect of Tannic Acid on Ichthyophthirius multifiliis Theronts
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Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
BACKGROUND
Ichthyophthiriasis induced by a freshwater teleost pathogen “Ichthyophthirius multifiliis” is one of the most important parasitic diseases with substantial economic losses to the aquaculture industry. Although malachite green, copper sulphate, formalin, and chloramine-T have been used to treat ichthyophthiriasis, there are  no chemicals that can be used safely and effectively to control this parasitic disease. As a result, application of natural, safe and strong components to prevent ichthyophthiriasis is of great importance.
Objective
The aim of the present research is to determine the short-term effectiveness of tannic acid (TA) on the parasite theronts of I. multifiliis.
Methods
In this study, TA as a main phenolic acid at different concentrations (0.0-7.0 mg/L) was applied to determine its acute toxicity against I. multifiliis theronts in various exposure times (1-3 h). The results were also statistically compared to the findings obtained from the control treatment and the positive control sample (15mg/L  formalin).
Results
There was a significant and direct correlation between TA concentration and exposure time in order to enhance the mortality rate of I. multifiliis theronts. An increase in levels of TA and exposure time in the studied ranges can significantly intensify the mortality number (P<0.05). The used natural phenolic constituent similar to 15 mg/L formalin led to a significant reduction in number of these theronts (> 80%) at 60 min.
Conclusions
Use of a standard phenolic agent such as TA at higher concentration and longer exposure time can potentially decrease the number of I. multifiliis theronts and control ichthyophthiriasis.
Language:
Persian
Published:
Journal of Veterinary Research, Volume:74 Issue: 2, 2019
Pages:
219 to 227
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