Abstract
Five iso-nitrogenous (39.0 % crude protein) and iso-caloric diets (510 kJ gross energy) were prepared, with fumaric acid added at varying inclusion levels; 0 (D1), 0.5 (D2), 1.0 (D3), 1.5 (D4) or 2.0 (D5) g kg-1 of diet. Diets were fed to triplicate groups of Clarias gariepinus (mean initial weight 68.14±1.5 g) for 84 days in 50 liters glass tanks. At the end of the experiment, fish fed with diet D3 gave significantly higher growth indices closely followed by the control diet (D1). There were significant differences in weight gain, specific growth rate, food conversion ratio and percentage survival in fish fed diet D3 when compared with those fed diet D5. The haematological parameters of experimental fish revealed significant variations among treatments. The highest haemoglobin, packed cell volume (PCV), red blood cell (RBC) and white blood cell (WBC) values were recorded in fish fed diet D2 while the lowest were recorded in those fed diets D3. Challenge test showed that mortality was 100 % in the control while it was between 0 and 86.67 % in other treatments. Inclusion of 1.0 g kg-1 of fumaric acid in C. gariepinus diets boosted growth. Inclusion of 0.5 g kg-1 of fumaric acid improved fish haematological parameters. In overall, incorporation of fumaric acid in C. gariepinus diets improved fish survival after Aeromonas sobria challenge.
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