Abstract
Aim: To find out the physiological recovery status of stunted fingerling of Labeo rohita reared in floating net cages at different stocking densities and feeding rations in cages. Methodology: Stunted fingerling (8 months) of L. rohita with an average body weight of 38.23 ± 1.90 g and length 14.65 ± 0.30 cm were stocked in cages at different densities viz. T1 (10), T2 (15), T3 (20) and T4 (25) fish m-3 and varying levels of feeding rations such as 3, 4, 5 and 6% for 330 days with crude protein (28%) pellet were fed twice a day. The 4×4 factorial design was used, and each stocking density and feeding level were triplicated. A total of 48 numbers of square shaped floating net cage, made of HDPE, each measuring 27 m-3 with 6 mm mesh size were used for the experiment. Results: A significant physiological recovery was observed in the T1 (10*5 and 10*6) treatment groups, which showed highest Hb (11.23± 0.08 g d l-1), RBC (2.83 ± 0.03 ×106 cum m-1), PCV (45.76 ± 0.16 %) and lymphocyte (69.32 ± 0.12 %) content at the end of the experiment. Similarly, significant changes were observed in glucose, cortisol, and lactate dehydrogenase, which were highest in T4 and normal in T1 group as the experiment progressed. Interpretation: The result of present study recommends that cage culture of stunted Labeo rohita is possible in Indian reservoirs with lower stocking density 10 m-2 and feeding ration of 5% body weight which maintains better physiological conditions for optimal growth of fish. Key words: Cage culture, Feeding ration, Labeo rohita, Physiological parameters, Stunted, Stocking density
Published Version
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