At every sampling time, the prawns were bulk-weighed, and length was measured individually from each aquarium. The percent weight gain (PWG) [100 (final body weight initial body weight)
(initial body weight)], percent length gain (PLG) [100 (final body length initial body length) (initial body length)] and feeding efficiency (FE) [(final body weight initial body weight)
(feed intake)] were calculated. The mortality was observed on daily basis and the moult stage of deceased prawn was determined during the total experimental period of 120 days