Utilização de hidrolisado protéico de camarão em rações para tilápia do Nilo (Oreochromis niloticus, L.)

Abstract

Aquaculture requires high-quality feeds with high protein content. So, the determination of less-expensive sources of protein which provides good growth is advantageous. Shrimp wastes have been identified as an animal protein source with great potential. Shrimp protein hydrolysate (SPH), a derived product obtained from shrimp wastes, was considered an excellent alimentary source and may serve as an useful source of protein and flavorants in food formulations. This work aimed to evaluate the nutritional quality of SPH through growth performance of juvenile Nile tilapia and its protein utilization. SPH was included in isonitrogenous diets at levels of 0, 5, 10 and 20% of fish meal protein replacement (SPH0, SPH5, SPH10 and SPH20) and offered to juvenile Nile tilapia (1.7±0.4 g) stocked in 40-L glass aquaria in a 45-day feeding trial. The inclusion of SPH did not produce statistical differences (P≥0.05) on final weight (27.18, 29.46, 26.02 and 25.19 g), survival (100%), relative weight gain (1,571, 1,624, 1,388 and 1,301%), average daily gain, ADG (0.57, 0.62, 0.54 and 0.52 g day-1), specific growth rate, SGR (7.15, 7.38, 6.85 and 6.73 % day-feed conversion ratio, FCR (1.15, 1.09, 1.13 and 1.17) and protein efficiency ratio, PER (2.26, 2.33, 2.20 and 2.14), respectively. The inclusion of SPH in diets for Nile tilapia statistically affected (P<0.05) the final fish body composition. Protein and ash contents decreased and fat content increased with SPH inclusion levels. This study clearly demonstrates that SPH could be included in diets for Nile tilapia without adverse effects on growth and protein utilization.