THE EFFECT OF SUBSTITUTING MAIZE WITH GRADED LEVEL OF BISCUIT WASTE ON THE GROWTH PERFORMANCE, NUTRIENT UTILIZATION, CARCASS COMPOSITION, HAEMATOLOGICAL PARAMETERS AND ECONOMIC PERFORMANCE OF AFRICAN CATFISH Clarias gariepinus (BURCHELL 1822)

Abstract

The effect of replacing maize with biscuit waste (BW) in the diet of Clarias gariepinus was evaluated in a 70-day feeding trial. Four isonitrogenous diets were prepared in which biscuit waste was used to replace maize at a rate of 50, 75 and 100% respectively. A diet without biscuit waste served as control. Each treatment had three replicates stocked with 10 catfish juveniles per tank with (mean initial body weight16.44±2.21g) per fish. The performance of the fish fed test diets was compared with fish fed a maize-based control diet containing 42.94% crude protein. The fish on the test diets performed better than the fish fed control diet with respect to mean weight gain (95.12±2.78g in BW 75 Vs 78.67±3.74g in control) and specific growth rate (3.04±0.04 %day -1 Vs 2.79±0.07 %day -1 ). Feed intake, feed conversion ratio and the protein efficiency ratio were not significantly different between test diets and the control. The inclusion of biscuit waste significantly improved (P<0.05) crude protein retention in the fish carcass. All the haematological parameters increased as a result of BW inclusion, the converse was however observed in cholesterol and triglyceraldehyde. There was significant difference (P<0.05) in the cost of feed intake and value of fish. Â