Abstract
We studied in vitro the potential of plant extracts to inhibit the infection caused by Ichthyophonus sp. in blue tilapia (Oreochromis aureus). We inoculated Ichthyophonus sp. on agar plates where we placed the filter discs that were prepared by filtering the aqueous extracts (five concentrations) of ginger (Zingiber officinale), linseed (Linum usitatissimum), henna (Lawsonia inermis) and white turmeric (Curcuma zedoaria). All plants inhibited the growth of Ichthyophonus sp. in the highest concentration (20%); Z. officinale appeared to be the most effective, whereas C. zedoaria was the least effective. This study suggests that widely available and inexpensive plant extracts might be effective natural agents to prevent the Ichthyophonus sp. infection in fish. More research is needed in order to ascertain the efficiency of the plant extracts in vivo as well as to find a proper practice used in aquaculture.
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