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Table 3 Growth performance and hematological characteristics of juvenile barred knifejaw fed diets with five different protein levels for 8 weeks

From: Re-evaluation of the optimum dietary protein level for maximum growth of juvenile barred knifejaw Oplegnathus fasciatus reared in cages

Parameters

Protein level in the diets (%)

35

40

45

50

60

WG (%)1

161 ± 5.7c

171 ± 2.5b

181 ± 3.1a

182 ± 5.7a

181 ± 6.1a

FE (%)2

70.9 ± 2.3b

75.9 ± 3.4ab

82.0 ± 2.4a

81.7 ± 2.7a

79.8 ± 2.9a

SGR (%/day)3

1.85 ± 0.05c

1.94 ± 0.02b

2.00 ± 0.04a

2.01 ± 0.04a

2.00 ± 0.05a

PER4

2.03 ± 0.07a

1.86 ± 0.06ab

1.48 ± 0.07b

1.44 ± 0.07b

1.33 ± 0.05c

HSI5

3.23 ± 0.05ab

3.32 ± 0.05a

3.19 ± 0.06ab

3.08 ± 0.04b

3.03 ± 0.03c

CF6

2.55 ± 0.06b

2.71 ± 0.07ab

2.83 ± 0.09a

2.81 ± 0.07a

2.78 ± 0.05a

PRE (%)7

35.1 ± 2.9a

28.2 ± 3.5ab

26.3 ± 1.8b

26.1 ± 2.0b

23.5 ± 2.3c

ERE (%)8

37.9 ± 3.1b

43.2 ± 3.5a

44.9 ± 2.9a

41.6 ± 28ab

42.9 ± 2.7a

Hematocrit (%)

32.4 ± 1.9

29.3 ± 2.9

28.9 ± 3.2

30.4 ± 2.1

31.1 ± 2.8

Hemoglobin (g/dl)

5.9 ± 0.4b

6.8 ± 0.6a

7.3 ± 1.0a

7.1 ± 0.8a

6.8 ± 0.6a

Survival rate (%)

98.3 ± 2.9a

98.3 ± 2.9a

100a

100a

95.0 ± 5.0b

  1. Values are means from triplicate groups of fish where the means in each row with a different superscript are significantly different (P < 0.05)
  2. 1Percent weight gain: (final wt. − initial wt.) × 100/initial wt
  3. 2Feed efficiency: (wet weight gain/dry feed intake) × 100
  4. 3Specific growth rate: 100 × (ln final wt. − ln initial wt.)/days
  5. 4Protein efficiency ratio: (wet weight gain/protein intake) × 100
  6. 5Hepatosomatic index: (liver weight/body weight) × 100
  7. 6Condition factor: [fish wt. (g)/fish length (cm)3] × 100
  8. 7Protein retention efficiency: [(final total body protein − initial total body protein)/total dietary protein fed] × 100
  9. 8Energy retention efficiency: [(final total body energy − initial total body energy)/total dietary energy fed] × 100