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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