Table 2.
Growth performance and feed utilization of adult triploid rainbow trout in different diet groups (mean ± standard error).
| Groups | Dietary protein/lipid levels (g kg−1) | Initial weight (kg) | Final weight (kg) | Survival (%) | Weight gain rate (%) | Feed conversion ratio | Feed intake (% day−1) |
|---|---|---|---|---|---|---|---|
| DP300DL200 | 300/200 | 3.32 ± 0.10 | 4.21 ± 0.01 | 98.7 ± 0.5 | 27.2 ± 3.7 | 1.81 ± 0.21 | 0.45 ± 0.05 |
| DP300DL250 | 300/250 | 3.28 ± 0.07 | 4.27 ± 0.20 | 98.9 ± 0.3 | 29.8 ± 3.5 | 1.71 ± 0.28 | 0.53 ± 0.02 |
| DP300DL300 | 300/300 | 3.22 ± 0.04 | 4.32 ± 0.10 | 98.7 ± 0.3 | 34.0 ± 2.0 | 1.53 ± 0.01 | 0.49 ± 0.03 |
| DP350DL200 | 350/200 | 3.22 ± 0.04 | 4.24 ± 0.04 | 98.4 ± 0.3 | 32.1 ± 1.2 | 1.53 ± 0.10 | 0.51 ± 0.03 |
| DP350DL250 | 350/250 | 3.27 ± 0.08 | 4.33 ± 0.18 | 98.3 ± 0.3 | 35.4 ± 2.6 | 1.31 ± 0.01 | 0.54 ± 0.03 |
| DP350DL300 | 350/300 | 3.31 ± 0.05 | 4.47 ± 0.02 | 98.6 ± 0.3 | 35.2 ± 2.7 | 1.35 ± 0.06 | 0.48 ± 0.05 |
| DP400DL200 | 400/200 | 3.16 ± 0.04 | 4.21 ± 0.01 | 98.9 ± 0.2 | 33.0 ± 1.5 | 1.38 ± 0.09 | 0.50 ± 0.03 |
| DP400DL250 | 400/250 | 3.19 ± 0.01 | 4.43 ± 0.08 | 98.4 ± 0.2 | 38.6 ± 2.0 | 1.40 ± 0.07 | 0.55 ± 0.01 |
| DP400DL300 | 400/300 | 3.21 ± 0.03 | 4.46 ± 0.01 | 98.0 ± 0.5 | 39.1 ± 1.4 | 1.23 ± 0.08 | 0.54 ± 0.04 |
|
| |||||||
| Protein levels | 300 | 3.27 ± 0.04 | 4.27 ± 0.07 | 98.8 ± 0.2 | 30.3 ± 1.9A | 1.68 ± 0.11B | 0.49 ± 0.02 |
| 350 | 3.26 ± 0.03 | 4.35 ± 0.05 | 98.5 ± 0.1 | 34.2 ± 1.3AB | 1.40 ± 0.05A | 0.51 ± 0.02 | |
| 400 | 3.19 ± 0.02 | 4.36 ± 0.05 | 98.4 ± 0.2 | 36.9 ± 1.3B | 1.34 ± 0.05A | 0.53 ± 0.02 | |
|
| |||||||
| Lipid levels | 200 | 3.23 ± 0.04 | 4.22 ± 0.01X | 98.7 ± 0.2 | 30.7 ± 1.5X | 1.57 ± 0.10 | 0.49 ± 0.02 |
| 250 | 3.25 ± 0.03 | 4.34 ± 0.08XY | 98.5 ± 0.2 | 34.6 ± 1.9XY | 1.47 ± 0.10 | 0.54 ± 0.01 | |
| 300 | 3.25 ± 0.03 | 4.42 ± 0.04Y | 98.4 ± 0.2 | 36.1 ± 1.3Y | 1.37 ± 0.05 | 0.50 ± 0.02 | |
|
| |||||||
| Protein levels | 0.158 | 0.377 | 0.331 | 0.017 | 0.014 | 0.391 | |
| Lipid levels | 0.886 | 0.047 | 0.626 | 0.048 | 0.221 | 0.119 | |
| Protein levels × lipid levels | 0.425 | 0.848 | 0.403 | 0.863 | 0.914 | 0.788 | |
Data in the same column with different superscripts (A, B, and C based on two-way ANOVA) represent that the significant difference is discovered in the dietary protein level (P < 0.05), and those with different superscripts (X, Y, and Z based on two-way ANOVA) represent that the significant difference is discovered in the dietary lipid level (P < 0.05).