Bibliographic Details
| Title: |
Effects of dietary inclusion of lyophilized açai berries (Euterpe oleracea) on growth metrics, metabolic and antioxidant biomarkers, and skin color of juvenile tambaqui (Colossoma macropomum). |
| Authors: |
da Silva, Thamyres Vanessa N., dos Santos, Camila F., dos Santos, Jessica M. L., Schmitz, Marcos J., Ramírez, Juan R. B., Torres, Marcelo F., Barbas, Luis André L., Sampaio, Luís A., Verde, Pablo E., Tesser, Marcelo B., Monserrat, José M. |
| Source: |
Aquaculture International; Apr2023, Vol. 31 Issue 2, p1031-1056, 26p |
| Subject Terms: |
FISH feeds, TAMBAQUI, ACAI palm, HUMAN skin color, COLOR of fish, OXIDANT status, FISH skin |
| Abstract: |
In this study, the effects of lyophilized Euterpe oleracea (LEO) as a dietary antioxidant additive were assessed on growth, skin coloration, bioactive muscle properties, metabolic parameters, and antioxidant status of tambaqui (Colossoma macropomum). Fish (initial body weight 0.92 ± 0.01 g) were fed five isoproteic (40% of crude protein) and isocaloric (20 kJ/g gross energy) diets (three replicates each) with graded LEO levels (6.3, 13, 25, 50, and 100 g per kg of diet), and a control group (0 g kg−1 LEO) at 10% of total biomass each day during 30 days. The experiment was conducted in a semistatic system (18 tanks of 200 L; N = 50 fish per tank). The results showed that the greatest final body length (7.92 ± 0.08 cm) was obtained in fish fed 50 g kg−1 LEO (p < 0.05). Fish fed 50 g and 100 g kg−1 LEO had higher final body weight (FBW, 115% and 119%, respectively) and weight gain (WG, 118% and 124%, respectively) than control group (p < 0.05). Feed conversion ratio (0.73–0.78), protein efficiency ratio (3.44–3.48), and feed intake (3.85–4.01% day−1) were improved in fish fed 13 g to 100 g kg−1 LEO (p < 0.05). Condition factor (K) and proximate carcass composition were not altered by feeding treatments (p > 0.05). LEO-enriched diets (50 g to 100 g kg−1 LEO) intensified the cyan color in the fish skin (p < 0.05). The DPPH• scavenging activity, total polyphenols, and flavonoids in the muscle were not changed (p > 0.05). Dietary LEO did not alter the muscle's cholesterol, glucose, glycogen, and total protein levels compared to the control group (p > 0.05). However, the muscle triglyceride in the LEO treatments was significantly lower (40.5%) than in the control (p < 0.05). The electron transport system activity in muscle was significantly increased (76.3%) with dietary LEO of 13 g to 100 g kg−1. LEO boosted the total antioxidant capacity (ACAP) in the intestine (39.6%) (p < 0.05); however, there were no differences in liver and muscle (p > 0.05). The malondialdehyde (MDA) concentrations showed no differences in the intestine, liver, and muscle regardless of treatments (p > 0.05). A fitted second-order polynomial estimated that 54.7 g kg−1 LEO results in lower intestine MDA levels. Overall, 50 g kg−1 LEO promoted tambaqui growth, improved the skin color, adjusted hypolipidemic and bioenergetics in the muscle, enhanced intestinal ACAP, and minimized MDA levels in this tissue. Therefore, LEO is a potential feed supplement used in tambaqui production. [ABSTRACT FROM AUTHOR] |
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| Database: |
Complementary Index |
