Table 4.
Growth performance, feed utilization and organ indices.
| Parameters | Clam meal levels (%) | |||
|---|---|---|---|---|
| 0% | 10% | 20% | 30% | |
| Initial weight (g) | 6.03 ± 0.25 | 6.03 ± 0.20 | 6.05 ± 0.26 | 6.03 ± 0.18 |
| Final weight (g) | 49.60 ± 2.40b | 60.70 ± 1.23a | 60.40 ± 2.35a | 58.00 ± 3.18ab |
| Weight gain (%) | 716.45 ± 20.16b | 898.65 ± 30.06a | 876.18 ± 15.06a | 838.63 ± 34.84a |
| Survival (%) | 98.75 ± 1.25 | 98.75 ± 1.25 | 97.50 ± 1.44 | 97.50 ± 1.44 |
| Feed intake (g/fish/day) | 1.24 ± 0.02b | 1.41 ± 0.03a | 1.48 ± 0.03a | 1.49 ± 0.05a |
| Feeding efficiency (FE) | 0.43 ± 0.03 | 0.50 ± 0.00 | 0.45 ± 0.03 | 0.43 ± 0.03 |
| Protein efficiency ratio (PER, %) | 0.70 ± 0.02ab | 0.77 ± 0.02a | 0.71 ± 0.03ab | 0.66 ± 0.01b |
| Protein retention value (PRV, %) | 28.55 ± 2.12b | 36.13 ± 1.71a | 35.44 ± 1.62ab | 34.40 ± 1.08ab |
| Fulton condition factor (K factor, %) | 1.75 ± 0.03 | 1.75 ± 0.03 | 1.74 ± 0.03 | 1.77 ± 0.04 |
| Hepatosomatic index (HSI, %) | 1.74 ± 0.13a | 1.05 ± 0.10b | 1.18 ± 0.08b | 1.24 ± 0.11b |
| Intestinosomatic index (ISI, %) | 2.63 ± 0.13 | 2.35 ± 0.09 | 2.62 ± 0.09 | 2.73 ± 0.19 |
a,bMean values within a row with unlike superscript letters were significantly different (P < 0.05).