This study was conducted in three earthen ponds to evaluate the replacement of fish meal by low cost plant protein (canola meal) for major carps in semi-intensive culture system. Each pond was fertilized with cattle manure at the rate of 0.16g N/100g wet fish body weight daily. A control diet (30% CP), formulated by using fish meal, cotton seed meal, maize gluten and rice polish, was designated as T₁, while in T₂ and T₃, the fish meal was replaced with canola meal by 20 and 40%, respectively. Feeding was done at the rate of 4% of wet fish body weight daily for five months. The overall average weight gains in T₁, T₂ and T₃ for three fish species i.e. Labeo rohita, Cirrhinus mrigala and Catla catla were 356.6 ± 15.12, 332.6 ± 14.32 and 362.4 ± 12.12; 320.4 ± 14.03, 305.6 ± 14.03 and 337.1 ± 16.02; and 284.6 ± 13.07, 282.2 ± 15.13 and 305.1 ± 17.43g, respectively. Net fish yields (all the species together) were 1529.5 ± 13.93, 1327.0 ± 12.19 and 1122.5 ± 10.28 Kg/ha/year under T₁, T₂ and T₃, respectively. The gross fish production was calculated as 2338.5 ± 12.49, 2137.5 ± 11.65 and 1931.5 ± 13.01 Kg/ha/year in T₁, T₂ and T₃ pond, respectively. In all the treatments, Catla catla showed better growth performance, followed by Labeo rohita and Cirrhinus mrigala. The treated ponds caused a decrease in fish production when replacement of fish meal was done with canola meal.