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A 60-day feeding trial was carried out to examine the ameliorative effects of graded levels of dietary L-threonine [T1 = 7.3 (un-supplemented), T2 = 10.6, T3 = 13.5 and T4 = 16.4 g/kg feed] on immune response, nutritional physiology and disease resistance in rohu (Labeo rohita) fingerlings against different stocking densities and Aeromonas hydrophila. A total of 504 numbers of uniform-sized rohu fingerlings (3.0 ± 0.03 g) were stocked at two stocking densities, that is, in high stocking density (30 numbers/tank) and low stocking density (12 numbers/tank) in triplicate groups

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