Table 2 Growth performance and feed utilization of Chelon ramada fed a basal diet supplemented with varing levels of rosemary oil and/or Zymogen Forte during a 75-day rearing trial in brackish groundwater

IW (g/fish)

8.50 ± 0.02

8.50 ± 0.02

8.52 ± 0.02

8.52 ± 0.01

8.51 ± 0.01

-

-

-

FW (g/fish)

21.30 ± 0.31^e

22.87 ± 0.35^d

28.21 ± 0.35^b

26.47 ± 0.32^c

30.90 ± 0.77^a

0.000

0.000

0.377

WG (g/fish)

12.80 ± 0.32^e

14.36 ± 0.37^d

19.70 ± 0.36^b

17.95 ± 0.31^c

22.40 ± 0.78^a

0.000

0.000

0.393

ADG(g/fish/day)

0.171 ± 0.004^e

0.192 ± 0.005^d

0.263 ± 0.005^b

0.239 ± 0.004^c

0.299 ± 0.010^a

0.000

0.000

0.396

SGR (%/fish/day)

1.22 ± 0.02^e

1.32 ± 0.02^d

1.60 ± 0.02^b

1.51 ± 0.02^c

1.72 ± 0.03^a

0.000

0.000

0.183

Survival (%)

76.67 ± 3.33^d

86.33 ± 1.67^c

98.33 ± 1.67^a

92.67 ± 1.67^b

96.67 ± 3.33^a

0.029

0.000

0.009

Feed Intake, g/fish

28.07 ± 2.47^bc

25.02 ± 0.59^c

31.85 ± 0.36^ab

31.13 ± 0.61^b

35.61 ± 1.11^a

0.000

0.000

0.143

FCR

2.20 ± 0.25^a

1.74 ± 0.01^b

1.62 ± 0.02^b

1.73 ± 0.01^b

1.59 ± 0.01^b

0.147

0.000

0.608