Table 5 The hepatosomatic index (HSI), intestosomatic index (ISI), relative gut length (RGL), hepatopancreas protein content (HPC) and intestinal protein content (IPC) of sub-adult grass carp fed with graded levels of methionine

2.03 ± 0.32^ab

2.17 ± 0.35^b

1.98 ± 0.29^ab

1.85 ± 0.32^a

1.91 ± 0.29^a

2.19 ± 0.28^b

8.74 ± 0.43^a

8.74 ± 0.33^a

9.84 ± 0.55^b

9.66 ± 0.43^b

9.40 ± 0.68^ab

9.40 ± 0.72^ab

1.27 ± 0.19^b

1.39 ± 0.16^c

1.24 ± 0.15^b

1.07 ± 0.13^a

1.06 ± 0.11^a

1.16 ± 0.18^ab

148.7 ± 16.25

148.7 ± 8.97

150.6 ± 12.61

146.2 ± 12.56

142.0 ± 14.39

143.7 ± 9.26

9.88 ± 0.92

9.65 ± 1.02

10.19 ± 1.05

9.79 ± 0.63

9.65 ± 1.02

9.38 ± 0.83