Table 3 Mean growth rates and yield parameters of O. niloticus cultured under monoculture and polyculture ponds (data are mean ± SE)

Average initial weight (g)

5.01 ± 0.05^a

5.01 ± 0.05^a

Rearing period (days)

240

240

Average final weight (g)

123.64 ± 2.57^a

146.58 ± 3.56^b

Total weight gain

118.63 ± 2.58^a

141.57 ± 3.56^b

Survival rate (%)

92.13 ± 1.70^a

96.62 ± 3.97^b

Specific growth rates (%)

1.33 ± 0.01^a

1.40 ± 0.04^b

Gross fish yield (tonha⁻¹)

10.27 ± 0.55^a

15.25 ± 0.64^b

Net fish yield (tonha⁻¹)

10.26 ± 0.54^a

15.25 ± 0.64^b

Net annual yield (tonha⁻¹yr⁻¹)

1797.25 ± 95.44^a

2671.30 ± 111.55^b