1. Abarca A, Bethke J, Narváez E, Flores R, Mercado L (2012) Parameters to evaluate the immunostimulant effect of zymosan A in head kidney leukocytes (HKL) of salmonids. Lat Am J Aquat Res 40:545–552
2. Alishahi M, Abdy E (2013) Effects of different levels of Aloe vera L. extract on growth performance, hemato-immunological indices of Cyprinus carpio L. Iran J Vet Sci Technol 5:33–44
3. Azadmehr A, Hajiaghaee R, Rezazadeh SH, Afshari A, Kiani Amin M, Baradaran B, Ebrahimi P (2011) Evaluation of Lavandula officinalis extract on lymphocyte proliferation and tumor necrosis factor-alpha production. J Med Plants 10:142–147
4. Barrett B (2003) Medicinal properties of Echinacea: a critical review. Phytomedicine 10:66–86
5. Behera T, Swain P, Sahoo SK, Mohapatra D, Das BK (2011) Immunostimulatory effects of curcumin in fish, Labeo rohita (H.) Indian J Nat Prod Resour 2:184–188