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. 2021 Oct 11;7(4):1360–1370. doi: 10.1016/j.aninu.2021.07.008

Table 4.

Growth performance, feed utilization efficiency, and body indices of rainbow trout fed experimental diets for 10 weeks1.

Item FO SO BSLO BSLO + BA P-value
Final body weight, g 186.60 ± 5.89a 180.48 ± 5.48a 185.14 ± 3.65a 157.42 ± 2.59b 0.009
Weight gain2, g 154.61 ± 5.88a 148.48 ± 5.48a 153.14 ± 3.65a 125.42 ± 2.59b 0.009
Body weight gain3, % 483.15 ± 18.39a 464.00 ± 17.12a 478.57 ± 11.41a 391.94 ± 8.10b 0.009
SGR4, %/d 2.52 ± 0.05a 2.47 ± 0.04a 2.51 ± 0.03a 2.27 ± 0.02b 0.007
FI5, g/fish 151.18 ± 1.15 146.29 ± 0.10 157.86 ± 1.52 140.43 ± 9.96 0.435
FCR6 0.98 ± 0.03 0.99 ± 0.04 1.04 ± 0.02 1.12 ± 0.06 0.258
PER7 2.25 ± 0.08 2.34 ± 0.06 2.20 ± 0.02 2.04 ± 0.12 0.122
Survival8, % 100 ± 0.00 96.00 ± 0.00 96.00 ± 0.00 97.33 ± 2.67 0.530
CF9, % 1.48 ± 0.02 1.49 ± 0.03 1.47 ± 0.03 1.39 ± 0.04 0.098
HSI10, % 1.24 ± 0.06 1.10 ± 0.02 1.20 ± 0.02 1.25 ± 0.06 0.061
VSI11, % 10.34 ± 0.56b 10.37 ± 0.33b 12.13 ± 0.28a 11.75 ± 0.40a 0.004

FO = fish oil; SO = soybean oil; BSLO = black soldier fly oil; BA = bile acid.

1

Data expressed as mean ± SE, n = 3 (each replicate tank was stocked with 25 fish), values along row with different superscripts differ significantly (P < 0.05). Initial average weight of fish is 32 ± 0.0 g.

2

Weight gain (g) = Final body weight (g) – Initial body weight (g).

3

Weight gain (%) = [Weight gain (g)/Initial body weight (g)] × 100.

4

Specific growth rate (SGR, %/d) = 100 × [ln Final body weight (g) – ln Initial body weight (g)]/Duration of feeding.

5

Feed intake (g/fish) = Total dry feed given (g)/Number of fish.

6

Feed conversion ratio (FCR) = Feed consumption (g)/[Final biomass (g) – Initial biomass (g) + Dead fish weight (g)].

7

Protein efficiency ratio (PER) = Net weight gain (g)/Protein fed (g).

8

Survival (%) = 100 × (Total number of fish harvested/Total number of fish stocked).

9

Condition factor (CF, %) = 100 × Weight of fish/(Length of fish)3.

10

Hepatosomatic index (HSI, %) = 100 × Wet weight of liver (g)/Whole body weight of fish (g).

11

Viscerasomatic index (VSI, %) = 100 × Wet weight of visceral (g)/Whole body weight of fish (g).