The vulnerability of four prey species to predation by the freshwater prawn, Macrobrachium malcolmsonii, was found to be in order of decreasing vulnerability: tadpoles of frog ( Rana cyanaphyctis) > minnow ( Aplocheilus lineatus) > common carp fry ( Cyprinus carpio) > Tilapia mossambica fry. The weight of the prey consumed per day was, respectively, 12.48 ± 1.45 g, 6.02 ± 1.15 g, 5.61 ± 0.40 and 2.89 ± 0.26 g; and the estimated 50% predation time was 1.25 ± 0.26 days, 1.66 ± 0.33 days, 2.0 ± 0.17 days, and 3.54 ± 0.72 days, respectively.