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This study investigated the effect of different levels of dietary niacin on growth performance, feed utilization, digestive enzyme activity, and biochemical body composition of juvenile of common carp ( Cyprinus carpio ). A formulated basal diet with 28 mg native niacin kg −1  was fortified with nicotinic acid to provide 50, 70, 90, or 110 mg kg −1 diet. Fish with initial average weight of 25 ± 0.28 g were fed to visual satiation three times per day in triplicate for 8 weeks. The results showed that 90 mg niacin significantly improved (P &lt; 0.05) growth performance and feed utilization of fish compared to the control group. The increase in dietary niacin level resulted in an increasing trend of whole-body protein and lipid content (P &lt; 0.05). Moreover, Lipase, total protease, and alkaline phosphatase activities were significantly higher (P &lt; 0.05) in fish fed 90 mg niacin kg −1  diet than that in the control group. Using polynomial regression, the optimum dietary niacin level in  C. carpio  juveniles was estimated as 98 mg kg −1  diet when percentage of body weight gain was plotted against dietary niacin levels.

Growth and physiological response of juvenile common carp ( Cyprinus carpio ) to increased levels of dietary niacin