This diet contains several dietary additives including β-glucans, vitamin E, vitamin C and zinc and resulted in increased magnitude of expression of both immunoglobulins (IgM, IgT and IgD) and anti-viral genes including, MX Dynamin Like GTPase 1 (MX), and Interferon-gamma (IFN-γ) following infection in comparison to those fish fed the control diet. The gene discussed is MX1; the disease is infection.