Table 3.
Growth performance of oscar (Astronotus ocellatus) fed experimental diets containing different levels of lipid and carbohydrate and exposed to numbers of stress.
| HL0Stress | HL2Stresses | HL4Stresses | LL0Stress | LL2Stresses | LL4Stresses | |
|---|---|---|---|---|---|---|
| Initial weight (g) | 6.03 ± 0.71 | 6.90 ± 0.56 | 6.73 ± 0.72 | 7.00 ± 0.60 | 7.03 ± 0.80 | 7.06 ± 0.95 |
| Weight gain (g) | 47.23 ± 8.15 | 47.00 ± 6.05 | 45.00 ± 5.23 | 41.93 ± 3.23 | 39.80 ± 2.16 | 34.70 ± 3.04 |
| SGR (%/day) | 3.88 ± 0.42 | 3.66 ± 0.31 | 3.64 ± 0.27 | 3.47 ± 0.06 | 3.39 ± 0.22 | 3.18 ± 0.14 |
| FCR | 2.49 ± 0.23 | 1.95 ± 0.30 | 2.21 ± 0.35 | 2.51 ± 0.34 | 2.62 ± 0.31 | 2.66 ± 0.32 |
| DFI (%/day) | 7.04 ± 0.32 | 6.09 ± 0.86 | 5.37 ± 1.16 | 6.74 ± 0.98 | 6.89 ± 0.59 | 6.75 ± 0.61 |
| HSI (%) | 2.65 ± 0.31 | 2.27 ± 0.25 | 2.83 ± 0.15 | 2.20 ± 0.26 | 2.60 ± 0.20 | 2.37 ± 0.32 |
| VSI (%) | 5.90 ± 0.56 | 5.33 ± 0.45 | 5.67 ± 0.55 | 5.63 ± 0.35 | 6.13 ± 0.38 | 5.87 ± 0.61 |
| Condition factor | 2.05 ± 0.37 | 2.16 ± 0.29 | 2.07 ± 0.22 | 2.05 ± 0.27 | 1.84 ± 0.07 | 1.67 ± 0.28 |
| Survival rate (%)# | 97.77 ± 3.85 | 95.55 ± 3.85 | 93.33 ± 6.67 | 95.55 ± 3.85 | 95.55 ± 3.85 | 95.55 ± 3.85 |
| Survival rate after AC (%)$ | 56.25 ± 8.84 | 93.75 ± 8.84 | 81.25 ± 8.84 | 50.00 ± 0.00 | 87.50 ± 0.00 | 68.75 ± 8.84 |
WG = (final weight − initial weight); SGR: specific growth rate = ((lLn W2 − Ln W1)/63 days) × 100; FCR: feed conversion ratio = dry feed consumed (g)/WG (g); DFI: daily feed intake (%body weight.day−1) = 100 × feed consumed (g)/((initial weigh + final weight) × 0.5 × days); HSI: hepatosomatic index = (liver weight (g)/body weight (g)) × 100; VSI : viscerosomatic index = (visceral weight (g)/body weight (g)) × 100; CF: condition factor = (W2 (g)/length3) × 100; #survival rate (%) = (number of fish in each group remaining at the end of experiment/initial number of fish : 20) × 100; $survival rate after 48 hours acute confinement stress (AC stress). The six treatments were HL0Stress (high-lipid diet and without stress), HL2Stress (high-lipid diet and two-week stress), HL4Stress (high-lipid diet and four-week stress), LL0Stress (low-lipid diet and without stress), LL2Stress (low-lipid diet and two-week stress), and LL4Stress (low-lipid diet and four-week stress).Values are represented by means ± SDM of triplicate tanks; means without letter labels are not significantly different.