Two ponds were each stocked with male Tilapia mossambica postfingerlings and Ophicephatus striatus fry at 10,000/ha and 400/ha, respectively. Growth rate of male tilapia in monosex culture was highest during the second month of the 120-day culture period. An estimated average standing crop of 5,076 kg/ ha/yr for harvestable-sized tilapia with 93% recovery was calculated. Average yield and recovery for O. striatus were 20 kg/ha, and 33%. Fifteen females were recovered from each pond. The small number of tilapia reproduction was attributed to O. striatus predation.