Based on the results, there was a significant difference (P>0.05) reported in weight and length gain of fry fed with the different feeds during a period of 60 days. Fishes fed with T2 (Treatment) diet showed the highest mean weight gain, specific growth rate (SGR) and protein efficiency ratio (PER) than those fed with other diets. Lowest feed conversion ratio (FCR) and highest specific growth rate (SGR) SGR was obtained in T2. In the proximate analyses of the fish carcass the protein content was significantly highest in T2 compared to other treatments. The fat content was significantly higher in T4. From the findings of this study it can be concluded that seaweed Caulerpa spp. is a potential protein rich basal ingredient and can be used to as good feed additive if used 6% level in the diets of rohu (Labeo rohita) fry without compromising its growth performance.