Abstract: Atya crassa like its relative Macrobrachium species can be a source of foreign exchange for Nigeria. The Atya crassa was cultured in indoor and outdoor rearing systems to investigate the possibility of its growth and production in captivity. A. crassa of sizes ranging 7.05±0.13-8.5±0.05 g were purchased from fishermen around the Jebba Lake. They were transported in open Jerry cans in a cold van for about 2 h. The indoor tanks measured 3x2x1.5 m and were stocked 17 prawns per tank while the outdoor tanks were 2x2x1.5 m and stocked 10 prawns per tank. The experimental diets were formulated with crude protein levels 30, 35 and 40%. Each diet was assigned to two tanks each indoors and outdoors. They were fed twice daily (9 and 19 h) for 184 days. Positive growth was observed in both indoor and outdoor tanks. There was no significant difference in the growth of prawns fed outdoor (p>0.05) while there was significant difference indoors. The percentage survival of prawns was higher outdoors and there was no significant difference (p>0.05) while there was significant difference (p<0.05) in the survival indoors. The carcass composition of A. crassa fed the three diets showed crude protein lower at harvest than the prawns stocked initially. Percentage lipid, ash and fibre of the harvested prawns were higher than at initial stocking. A. crassa is cultivable in freshwater and it should be reared with 30% crude protein diet in outdoor systems.