Fairy shrimp collected from some natural habitats are characteristically identified by the bright orange/red pigmentation of their bodies (Sanoamuang et al., 2006). This color is presumably due to the deposition of carotenoids (specifically astaxanthin) from their natural food sources. As prawns are unable to form or convert intermediary precursor pigments to caratenoids, diets containing carotenoids must be fed and carotenoids will be stored in their tissue. Previous studies suggest that carotenoids, especially astaxanthin accumulated in the consumers, play an important role in enhancing body coloration, reproduction, immunity, survival and antioxidants (Miki, 1991; Linan-Cabelloet al., 2002; Velu et al., 2003). Thus, the relatively high content of carotenoids in our experimental prawns increasing their nutritional valueis expected to lead to a higher market price of the prawn.