Abstract
The replacement of fish meal (FM) by corn gluten meal (CGM) in practical diets for juvenile spotted rose snapper, Lutjanus guttatus, was evaluated. Six isonitrogenous (47% crude protein), isoenergetic (19.03 kJ g−1) diets were formulated by replacing 0, 20, 40, 60, 80, or 100% of FM protein with CGM protein. Diets with CGM inclusion were supplemented with crystalline Arginine (Arg) and Lysine (Lys). Juvenile fish (mean body weight 31.2 ± 0.3 g) were fed the experimental diets (n = 45 per diet) for 70 days. Growth performance, feed efficiency, hematological parameters, protease activity, body composition, and nutrient digestibility were evaluated. Growth performance and feed efficiency at 60% FM replacement showed no significant differences (P < .05) versus the control diet, although trypsin activity and dry matter digestibility were significantly reduced. Dietary inclusion in excess of 60% CGM caused hypercholesterolemia, while fish fed the maximum level of CGM inclusion showed hypertriglyceridemia. Juvenile fish fed a 60% CGM inclusion showed high protein retention and reduced lipid retention in their whole-body composition. A second-order polynomial regression showed that juvenile snapper attains a maximum growth rate when fed up to 40% CGM inclusion. Our results show that CGM can be used as a suitable ingredient to supply up to 60% of protein in diets for spotted rose snapper, provided these are supplemented with crystalline Arg and Lys.
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