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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)

From: Dietary protein requirement of Pacific white shrimp Litopenaeus vannamei in three different growth stages

  Experimental diets
P25 P30 P35 P40 P45 P50
Trial 1 (initial BW 0.65 g)
 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 ± 0.45ab 2.37 ± 0.58a 2.16 ± 0.40abc 1.58 ± 0.37bc 1.42 ± 0.18c 1.47 ± 0.33bc
 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
Trial 2 (initial BW 4.81 g)
 FBW1 10.8 ± 0.93b 11.6 ± 0.43ab 13.1 ± 1.18a 12.2 ± 0.92ab 11.7 ± 0.15ab 12.0 ± 1.32ab
 WG2 125 ± 19.1b 141 ± 8.43ab 173 ± 23.5a 153 ± 18.6ab 145 ± 3.94ab 148 ± 27.4ab
 DBI3 0.14 ± 0.02b 0.16 ± 0.01ab 0.20 ± 0.03b 0.18 ± 0.02ab 0.17 ± 0.00ab 0.17 ± 0.03ab
 FCR4 2.29 ± 0.25a 2.06 ± 0.13ab 1.71 ± 0.29b 1.71 ± 0.18b 2.01 ± 0.27ab 1.83 ± 0.33ab
 PER5 1.70 ± 0.19a 1.60 ± 0.10a 1.67 ± 0.31a 1.47 ± 0.16ab 1.12 ± 0.16b 1.12 ± 0.18b
 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
Trial 3 (initial BW 10.5 g)
 FBW1 15.5 ± 0.47b 18.7 ± 0.77a 19.5 ± 2.02a 18.0 ± 0.26a 18.2 ± 0.73a 18.3 ± 1.05a
 WG2 46.8 ± 4.59b 77.8 ± 6.88a 85.2 ± 19.4a 70.9 ± 2.95a 72.8 ± 6.62a 72.9 ± 10.4a
 DBI3 0.10 ± 0.01b 0.17 ± 0.02a 0.19 ± 0.04a 0.16 ± 0.01a 0.16 ± 0.01a 0.16 ± 0.02a
 FCR4 2.76 ± 0.26a 1.64 ± 0.16 b 1.55 ± 0.32 b 1.72 ± 0.14b 1.69 ± 0.22b 1.80 ± 0.29b
 PER5 1.38 ± 0.13c 1.98 ± 0.19a 1.88 ± 0.41ab 1.49 ± 0.12bc 1.33 ± 0.17c 1.15 ± 0.18c
 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
  1. Values are mean of triplicate groups and presented as mean ± S.D. Values with different superscript letters in the same row are significantly different (P < 0.05). The lack of superscript letter indicates no significant differences among treatments
  2. 1FBW final body weight (g)
  3. 2Weight gain (%) = [(final mean body weight − initial mean body weight)/initial mean body weight] × 100
  4. 3Daily body increase (g/day) = (final body weight − initial body weight)/days
  5. 4Feed conversion ratio = dry feed fed (g)/wet weight gain (g)
  6. 5Protein efficiency ratio = wet weight gain/total protein given
  7. 6Survival (%)