For the past three decades, the utilization of phytocompounds for the aquacultural growth and development are quite increased. Freshwater fish Rohu is one of the fine edible species in India. The medicinal plant Phyllanthus niruri has numerous bioactive compounds used to treat various human ailments. This study was planned to analyze the effect of P. niruri leaf extracts on the various growth parameters of freshwater fish, Labeo rohita. Adult fishes are acclimatized and exposed to 5mg/gm, 10mg/gm, 20mg/gm, 40mg/gm and 80mg/gm of aqueous extract of P. niruri for 30 days (n=6). Phytochemical analysis of the leaf extract showed the presence of phenols, saponins, alkaloids, tannins, terpenoids, flavonoids and steroids. Weight gain, average daily gain, specific growth rate, feed conversion ratio and survival rate of the control and five treated group fishes were studied. Our results concluded that bioactive compounds present in the aqueous leaf extracts of P. niruri enhanced the growth and feeding mechanism of the fishes which resulted in increased body weight, will eventually benefitted the aquacultural sector.