A 60-day feeding trial was conducted to determine the maximum dietary crude fiber level a tropical carp, lemon fin barb hybrid, could tolerate in their diet. Twenty fish (1.50 ± 0.05 g) were randomly stocked per 100 l aquarium tank in 3 replicates and fed twice a day with 5 isonitrogenous (30% protein), isocaloric (17 kJ g ), 35% carbohydrate and isolipidic (4%) test diets containing 0, 5, 10, 15 and 20% crude fiber until apparent satiation.