Methionine Modulated Bioavailability of Inorganic Zinc (ZnSO4. 7H2O) in Common Carp (Cyprinus carpioL.) Through Diets Containing Tricalcium Phosphate

The present work has been conducted to study the efficacy of methionine modulated bioavailability of dietary inorganic Zn (ZnSO4. 7H2O) in the fingerlings of common carp (Cyprinus carpio L.). The experiment was performed in triplicate for which young ones of common carp of average 3.39±0.68g weight and 6.02±0.25 cm length were stocked in the indoor glass aquaria (60× 30 ×30cm) @11 fish/ aquarium. Five diets including one control (D1) and four experimental diets (D2 to D5) were formulated. In treatment diets D2 and D3 ZnSO4.7H2O was added @88.4 and 176.8mg/kg, while in D4 and D5 ZnSO4.7H2O was added @88.4 and 176.8mg/kg along with 1% DL Methionine as additional, respectively. Crude protein content in the experimental diets ranged between 36.68 - 39.14%, while zinc concentrations in diets (D1 to D5) were recorded 31.80, 57.40, 61.60, 56.60 and 62.80 mg kg-1, respectively. Highest growth w.r.t. net weight gain was recorded (4.01g) and SGR (0.92%), feed conversion ratio (2.42) and protein efficiency ratio (1.08) was also recorded highest in fish fed with diet D5. Moisture content (%) in fish flesh ranged between 77.20 – 78.90, protein 14.80 – 16.70, lipid 1.75 – 2.73, ash 1.82 – 2.61 and carbohydrate 1.13 – 1.92% among the fish fed with diet D1 to D5. Zinc concentration was recorded significantly high in muscle (36.90 mg kg-1), liver (60.40 mg kg-1) and bone (109.56 mg kg-1). The present study indicates that Zn uptake in different tissues has been significantly improved due to addition of methionine in the formulated diets in young ones of common carp.