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Journal of Fisheries and Aquatic Science

Year: 2011 | Volume: 6 | Issue: 5 | Page No.: 545-554
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Authors

Adebayo Israel Adekunle

Keywords

Research Article

Growth and Blood Chemistry of Selected Clariid Catfishes Fed Phosphorus Supplemented Diets

Adebayo Israel Adekunle
Phosphorus is important for optimal growth and health of cultivated fish. This study investigates the effect of phosphorus supplemented diets on growth and blood chemistry of Heterobranchus bidorsalis, Clarias gariepinus and their hybrid, H. bidorsalis x C. gariepinus. Eleven isonitrogenous (40% Crude Protein) diets were formulated with graded phosphorus inclusion levels at 0, 0.2, 0.4, 0.6, 0.8, 1, 1.2, 1.4, 1.6, 1.8 and 2% for diets (DI to XI), respectively using dicalcium phosphate. Each diet was fed to triplicate groups of ten catfish mean weight (g) for H. bidorsalis (10.80±0.20), C. gariepinus (10.07±0.50) and their Hybrid (10.00±0.30) for 12 weeks in a laboratory based 3x11 factorial experiment. Growth responses were evaluated, while mineral composition of fish was analyzed using AOAC method. Phosphorus in Blood Serum (PBS) of the fishes was determined after the experiment. Data were analyzed using ANOVA test. The best result was at 0.8% P inclusion level (DV), where Final Mean Weight Gain and Net Protein Utilization were significantly (p<0.05) highest in C. gariepinus (40.07±0.24 g, 7.60±0.00), but statistically the same in H. bidorsalis (28.89±0.24 g, 4.53±0.00) and their Hybrid (26.95±0.24 g, 4.24±0.00), respectively. The mineral composition of fish carcass shows that P intake was significantly (p<0.05) highest (28.54±0.02) mg g-1 in H. bidorsalis and least in Hybrid (21.84±0.02). PBS was statistically (p<0.05) highest in Hybrid (6.31±0.01 mm3) and least in H. bidorsalis (5.39±0.01 mm3). The results show that P is essential for growth and body mineralization, while haematological values provided baseline information on the relevance of inorganic P supplement in the diets of the clariid fishes.
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