Table 2 Growth performance and feed utilization of L. vannamei fed the six experimental diets containing six different levels of crude protein (25, 30, 35, 40, 45, and 50% for P25, P30, P35, P40, P45, and P50, respectively)

 FBW¹

4.34 ± 0.66

4.46 ± 0.38

4.68 ± 0.24

4.92 ± 0.66

4.80 ± 0.53

4.40 ± 0.28

 WG²

571 ± 103

586 ± 58.4

619 ± 36.3

660 ± 102

637 ± 86.8

579 ± 44.1

 DBI³

0.10 ± 0.02

0.11 ± 0.01

0.11 ± 0.01

0.12 ± 0.02

0.12 ± 0.01

0.10 ± 0.01

 FCR⁴

1.77 ± 0.36

1.43 ± 0.35

1.32 ± 0.23

1.49 ± 0.34

1.58 ± 0.19

1.41 ± 0.36

 PER⁵

2.33 ± 0.45^ab

2.37 ± 0.58^a

2.16 ± 0.40^abc

1.58 ± 0.37^bc

1.42 ± 0.18^c

1.47 ± 0.33^bc

 Survival⁶

88.9 ± 7.86

85.2 ± 3.21

85.2 ± 3.21

86.1 ± 3.93

92.6 ± 32.1

83.3 ± 0.00

 FBW¹

10.8 ± 0.93^b

11.6 ± 0.43^ab

13.1 ± 1.18^a

12.2 ± 0.92^ab

11.7 ± 0.15^ab

12.0 ± 1.32^ab

 WG²

125 ± 19.1^b

141 ± 8.43^ab

173 ± 23.5^a

153 ± 18.6^ab

145 ± 3.94^ab

148 ± 27.4^ab

 DBI³

0.14 ± 0.02^b

0.16 ± 0.01^ab

0.20 ± 0.03^b

0.18 ± 0.02^ab

0.17 ± 0.00^ab

0.17 ± 0.03^ab

 FCR⁴

2.29 ± 0.25^a

2.06 ± 0.13^ab

1.71 ± 0.29^b

1.71 ± 0.18^b

2.01 ± 0.27^ab

1.83 ± 0.33^ab

 PER⁵

1.70 ± 0.19^a

1.60 ± 0.10^a

1.67 ± 0.31^a

1.47 ± 0.16^ab

1.12 ± 0.16^b

1.12 ± 0.18^b

 Survival⁶

91.7 ± 8.33

88.9 ± 12.7

83.3 ± 8.33

80.6 ± 4.81

80.6 ± 9.62

86.1 ± 12.7

 FBW¹

15.5 ± 0.47^b

18.7 ± 0.77^a

19.5 ± 2.02^a

18.0 ± 0.26^a

18.2 ± 0.73^a

18.3 ± 1.05^a

 WG²

46.8 ± 4.59^b

77.8 ± 6.88^a

85.2 ± 19.4^a

70.9 ± 2.95^a

72.8 ± 6.62^a

72.9 ± 10.4^a

 DBI³

0.10 ± 0.01^b

0.17 ± 0.02^a

0.19 ± 0.04^a

0.16 ± 0.01^a

0.16 ± 0.01^a

0.16 ± 0.02^a

 FCR⁴

2.76 ± 0.26^a

1.64 ± 0.16 ^b

1.55 ± 0.32 ^b

1.72 ± 0.14^b

1.69 ± 0.22^b

1.80 ± 0.29^b

 PER⁵

1.38 ± 0.13^c

1.98 ± 0.19^a

1.88 ± 0.41^ab

1.49 ± 0.12^bc

1.33 ± 0.17^c

1.15 ± 0.18^c

 Survival⁶

87.9 ± 10.5

97.0 ± 5.25

90.9 ± 0.00

81.8 ± 15.7

81.8 ± 0.00

81.8 ± 9.09