Table 3.
: Performance parameters of Lates calcarifer from each treatment (triplicate pooled mean ± 95%CI).
| Treatment | units | Diet 1 |
Diet 2 |
Diet 3 |
Diet 4 |
|
|---|---|---|---|---|---|---|
| 30-0 | 20-10 | 10-20 | 0-30 | |||
| Fish meal | (%) | 30 | 20 | 10 | 0 | Linear reg. |
| PPB | (%) | 0 | 10 | 20 | 30 | P-values |
| Initial weight | (g fish−1) | 4.8 ± 1.4 | 5.0 ± 1.3 | 4.9 ± 1.2 | 4.8 ± 1.4 | - |
| Final weight | (g fish−1) | 33.7 ± 5.2 | 30.0 ± 4.3 | 28.4 ± 5.0 | 25.7 ± 3.5 | 0.02 (-) |
| Weight gain | (g fish−1) | 29.0 ± 3.8 | 24.9 ± 3.0 | 23.5 ± 3.8 | 20.8 ± 2.1 | 0.004 (-) |
| Weight gain | (%) | 712 ± 90 | 611 ± 63 | 581 ± 34 | 544 ± 75 | 0.005 (-) |
| Initial length | (cm) | 7.1 ± 0.6 | 7.1 ± 0.6 | 7.1 ± 0.5 | 7.1 ± 0.5 | - |
| Final length | (cm) | 14.6 ± 0.9 | 13.5 ± 0.6 | 13.2 ± 0.7 | 12.8 ± 0.6 | 0.003 (-) |
| Length gain | (%) | 207.1 ± 8.0 | 191.2 ± 8.0 | 186 ± 3.0 | 181.3 ± 5.0 | 0.0003 (-) |
| Feed intake | (g fish−1 day−1) | 0.6133 ± 0.077 | 0.5870 ± 0.102 | 0.5973 ± 0.096 | 0.5907 ± 0.087 | - |
| Specific growth rate (%) | % (g d−1) | 4.2 ± 0.3 | 3.8 ± 0.2 | 3.7 ± 0.1 | 3.6 ± 0.3 | 0.005 (-) |
| Condition factor (CF) | 1.1 ± 0.02 | 1.2 ± 0.02 | 1.2 ± 0.03 | 1.2 ± 0.03 | 0.003 (+) | |
| survival | % | 96.3 ± 5.24 | 99.3 ± 1.44 | 100 | 94.8 ± 1.45 | - |
Notes: High 95%CI for initial and final weight because each diet has 2 tanks with medium fish and 1 tank with larger fish. Specific growth rate = (ln final mean weight – ln initial mean weight)/experimental days x 100. Condition factor (CF) = [fish weight/(total length)3]x100 at the start and at the end of the trial. P-values from linear regression (+) indicates positive correlation and (-) negative correlation. Further statistical tests are reported in the main text.