Simeon Oluwatoyin Ayoola


This study was carried out to evaluate the use of Ocimum gratissimum leaves on the growth performance and haematological parameters of Oreochromis niloticus juveniles. Five tanks with a size of 21.5x14.5x9 (LxBxH) containing 10 Oreochromis niloticus juveniles were fed with five isonitrogenous diets containing 27.11% crude protein with varying inclusion of O.gratissimum (Contol diet with O. gratissimum 0%, T1=25%, T2=50%, T3= 75%, and T4= 100%). The fishes were fed twice daily for an experimental period of 12 weeks. The fish in tank T3 (75% inclusion of O. gratissimum) had the best weight gain with mean value of 26.00±3.00g. The highest specific growth rate was recorded in tank T3 with mean value of 0.56±0.06. The highest food conversion ratio was recorded in tank T1 (25% inclusion of O. gratissimum) with mean value of 1.25±0.09. The highest protein efficiency ratio was also recorded in T3 (75% inclusion of O. gratissimum) with mean value of 0.03±0.01. No mortality was recorded in all experimental tanks. The fish fed with O. gratissimum showed increase in haematological values of Red blood cell (RBC), (0.02±0.00 104µL), and White with blood cell (WBC), (15.25±0.007 102µL) compared to the values of fish fed with control diet Red blood cell (RBC) was 0.01±0.00 and White blood cell (WBC) was 12.65±0.07 102µL. There was reduction in the haematological value of the fish fed with O. gratissimum in Haemoblogin (HBG), (4.45±0.07 g/dL) compared to the value of fish fed with control feed Haemoblogin (HBG), (5.15±0.14 g/dL). The genotoxicity test that was carried out showed that the highest counts of micro nucleus were present in tank T4 while the lowest counts of micro nucleus were found in tank T0. A significant difference was recorded (p<0.05). It is concluded that using O. gratissimum leaves as feed for O. niloticus enhances the growth of the fish and has no negative impact on the health status of the fish. Therefore partial replacement of feed with O. gratissimum should be encouraged.

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