As microbial disease in aquaculture industries implies serious financial
loss, an indiscriminate use of antibiotics for disease treatment may lead to
the promotion of undesirable side effects. Several alternativemethods are
considered to improve the quality and sustainability of aquaculture production
(Li et al., 2006). Of these methods, a wide range of medicinal
plants show potential effects on growth and survival as well as on the
antimicrobial properties of aquatic organisms (Immanuel et al., 2004).
This leads to the belief that phytochemicals could be an alternative to
the chemotherapeutic molecules in aquaculture (Sivaram et al., 2004).
Medicinal plants could be used as an immunoprophylactic in aquaculture
(Kirubakaran et al., 2010). Therefore, a growing interest has emerged in