Department of Fisheries and Aquaculture Technology, Federal University of Technology, Akure, Ondo State, Nigeria
Title: GUSTATION AND GROWTH PERFORMANCE OF NILE TILAPIA, Oreochromis niloticus FED VARYING LEVELS OF DIETARY AFRICAN BASIL, Ocimum gratissimum, LEAF SUPPLEMENTATION
The gustation and growth performance of Nile tilapia, Oreochromis niloticus fed African basil, Ocimum gratissimum leaf meal supplemented diet was assessed in the present study. O. niloticus of the initial weight of 11.85±0.24 was evaluated over a 56 days period. Five experimental diets were formulated at 0 mg/g (control), 20 mg/g, 40 mg/g, 60 mg/g and 80 mg/g inclusion levels of O. gratissimum. African basil leaf was treated by soaking in water for 72 hours and sun-dried. All diets were isonitrogenous with each treatment having three replicates. Fish fed the 80mg/g O. gratissimum leaf meal recorded the best growth performance in body weight gain and specific growth rate (SGR). Statistically, there was significant increase in growth and nutritional performance of fish in this study with increasing inclusion levels of O. gratissimum (P<0.05). There was no adverse effect of O. gratissimum supplementation on the hepatosomatic and intestinosomatic index of fish in this study (P<0.05). There was also significant increase in the gustation of fish with increasing O. gratissimum supplementation (P<0.05). This could be attributed to the supplementation of O. gratissimum. Therefore, the present study suggests that O. gratissimum leaf meal may be supplemented up to 80 mg/g level to increase gustation and growth performance of O. niloticus.