“…The prohibition of growth promoters in Europe has stimulated the search for alternatives such as prebiotics (Silva and Nörnberg, 2003), probiotics (Santin et al, 2001;Meurer et al, 2006;Meurer et al, 2007;Meurer et al, 2008;Pozza et al, 2010), enzymes (Furuya et al, 2001;Surek et al, 2008), organic acids (Maiorka et al, 2004), and plant extracts (Çabuk et al, 2006;Santurio et al, 2007;Windisch et al, 2008;Applegate et al, 2010, Soltani et al, 2010. For example, specifically in fish, the use of garlic extract for silver catfish (Rhamdia quelen) (Fernandes et al, 2007) and propolis for the Nile Tilapia (Meurer et al, 2009a) has yielded satisfactory results.…”