Parameters OC levels at different stocking densities
  7,500/ha 10,000/ha 12,500/ha
Inputs Kg/ha % Kg/ha % Kg/ha %
Inflow water 10.25 ± 1.15 1.14 10.25 ± 1.15 1.12 10.25 ± 1.15 1.1
Cow dung 735.00 ± 15.50 81.5 735.00 ± 15.50 80.1 735.00 ± 15.50 78.78
GOC 70.75 ± 5.25 7.84 77.25 ± 5.30 8.42 83.72 ± 5.76 8.97
RP 80.75 ± 5.50 8.96 88.32 ± 5.70 9.62 95.68 ± 6.00 10.25
Stocked fish 5.06 ± 0.20 0.56 6.73 ± 0.24 0.74 8.45 ± 0.30 0.9
Total input 901.81 ± 19.19 100 917.55 ± 2.12 100 933.10 ± 21.23 100
Output            
Effluent water 23.25 ± 2.35 2.58 27.36 ± 2.40 2.98 30.09 ± 2.50 3.23
Harvested fish 255.15 ± 10.50 28.3 209.94 ± 11.80 22.88 148.83 ± 7.55 15.95
Sediment accumulation 562.50 ± 18.50 62.37 580.50 ± 20.12 63.27 597.18 ± 23.10 64
Others 60.91 ± 10.62 6.75 99.75 ± 11.55 10.87 157.00 ± 13.40 16.82
Fcal= 172.42, Ftab = 5.14 at 5% level, CD = 14.02
Table 3: Input, output and balance of organic carbon (OC) in the polyculture of Indian major carps
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