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Effect of Acetic Acid on the Growth of Clarias gariepinus Fingerlings Challenged with Escherichia coli

JAFE Vol.  9(3): 41-47, 2022
Effect of Acetic Acid on the Growth of Clarias gariepinus Fingerlings Challenged with Escherichia coli
Igbo, N.U., Omowosowone, O.O. and Dada, A.A.
Five iso-nitrogenous (40.0% crude protein) diets were prepared with acetic acid added at varying inclusion levels: 0 (D1), 0.5 (D2), 1.0 (D3), 1.5 (D4) and 2.0 (D5) g kg-1 of diet. The diets were fed to triplicate groups of Clarias gariepinus (mean initial weight 4.5 ± 0.5 g) for 70 days in 40-litres (70 x 45 x 45) cm plastic tanks. At the end of the experiment, fish fed diet D4 gave significantly higher growth indices, followed closely by fish fed diet D5. There were significant differences in weight gain, food conversion ratio, feed efficiency ratio and protein efficiency ratio in fish fed diet D4 when compared with those fed the control diet, D1. The haematological parameters of the 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 D4, while the lowest were recorded in those fed diet D1. A challenge test with Escherichia coli showed that mortality was 100% in the control, while it was between 0 and 80.00% in other treatments. Inclusion of 1.5g/100g of acetic acid in Clarias gariepinus diets therefore boosted growth, and improved fish haematological parameters. Overall, the incorporation of acetic acid in C. gariepinus diets improved fish survival after Escherichia coli challenge.
Keywords:Organic acids, Pathogenic bacteria, Survival, Catfish.
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