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Table 3 Growth performance, feed utilization efficiency, and morphological parameters of rainbow trout fed the five experimental diets for 8 weeks

From: Dietary inclusion of mealworm (Tenebrio molitor) meal as an alternative protein source in practical diets for rainbow trout (Oncorhynchus mykiss) fry

 

MW0

MW7

MW14

MW21

MW28

WG1

943 ± 24b

1073 ± 34ab

1115 ± 14a

1052 ± 56ab

1053 ± 19ab

SGR2

4.69 ± 0.05b

4.92 ± 0.06ab

4.99 ± 0.02a

4.88 ± 0.10ab

4.89 ± 0.03ab

DFI3

3.37 ± 0.12a

2.98 ± 0.01b

2.82 ± 0.10b

2.92 ± 0.04b

2.98 ± 0.02b

PER4

2.03 ± 0.07b

2.34 ± 0.01a

2.42 ± 0.10a

2.33 ± 0.04a

2.32 ± 0.03a

FCR5

1.02 ± 0.04a

0.88 ± 0.01b

0.83 ± 0.03b

0.87 ± 0.01b

0.88 ± 0.01b

Survival (%)

100.0 ± 0.0

100.0 ± 0.0

96.7 ± 1.7

98.3 ± 1.7

96.7 ± 1.7

CF6

1.25 ± 0.03

1.26 ± 0.03

1.27 ± 0.02

1.25 ± 0.01

1.23 ± 0.02

HSI7

1.68 ± 0.05

1.45 ± 0.06

1.43 ± 0.14

1.61 ± 0.06

1.54 ± 0.09

VSI8

14.5 ± 0.7

12.9 ± 1.2

13.5 ± 0.4

14.2 ± 0.1

13.7 ± 0.1

  1. Values are mean of triplicate groups and presented as mean ± SE. 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. 1Weight gain (%) = [(final body weight − initial body weight)/initial body weight] × 100
  3. 2Specific growth rate (%/day) = [(ln final body weight − ln initial body weight)/days] × 100
  4. 3Daily feed intake (%) = (feed intake × 100)/[(initial body weight + final body weight + dead fish weight) × days/2]
  5. 4Protein efficiency ratio = wet weight gain/total protein given
  6. 5Feed conversion ratio = feed intake/wet weight gain
  7. 6Condition factor (%) = (weight of fish/(length of fish)3) × 100
  8. 7Hepatosomatic index (%) = (weight of liver/weight of fish) × 100
  9. 8Viscerosomatic index (%) = (weight of viscera/weight of fish) × 100