Dietary lycopene supplementation on Nile Tilapia (Oreochromis niloticus) juveniles submitted to confinement: effects on cortisol level and antioxidant response

Abstract

This study evaluates the inclusion of lycopene in the commercial diet for Nile Tilapia exposured to a stressor. For 60 days, ¢sh diet was supplemented with lycopene (600 mg kg À 1 diet) and at the end, subjected to con¢nement for 90 min. Zootechnical parameters (weight gain, speci¢c growth rate and intake), hormonal (cortisol level), biochemical {enzyme activity and lipid peroxidation level [thiobarbituric acid (TBARS)]} and physical (instrumental colour) parameters were also evaluated. Supplementation with lycopene did not alter zootechnical parameters. In uncon¢ned ¢sh, catalase (CAT) activity was reduced in the white muscle of ¢sh fed with lycopene; however, in red muscle, it was not altered. In ¢sh under con¢nement, plasma cortisol increased as well as CAT, glutathione reductase (GR) and lactate dehydrogenase (LDH) activity in both muscles. Lipid peroxidation of the ¢llet also displayed higher values. However, the lycopene supplementation abolished the e¡ects of con¢nement available through cortisol levels, remaining unchanged in the above parameters, activity of CAT, GR and LDH in both muscles and TBARS content of the ¢llet; in addition, it did not induce alteration of ¢llet coloration. Inclusion of lycopene in commercial feed reduces the impact of con¢nement and does not alter the zootechnical parameters; additionally, no modi¢cation of the ¢llet colour from juvenile Nile tilapia was observed.

Effects of long-term feeding of corn co-product-based diets on growth, fillet color, and fatty acid and amino acid composition of Nile tilapia, Oreochromis niloticus

“…Pigmentation or coloration is considered a desirable trait in certain food fishes such as trout and salmon (Li et al, 2007), whereas the same attribute is highly undesirable in some white-fleshed fish such as channel catfish (Li et al, 2011, Li et al, 2007 and tilapia (Girao et al, 2012).…”

From farm to fork: lipid oxidation in fish products. A review

“…TBARS content of fish treated with thymol remains unaltered for the entire trial, at 2.25 lg/g protein, while the carvacrol group raised up 2.78 lg/g protein. Interestingly, Girao et al (2012) tested the antioxidant ability of feed supplementation with lycopene (600 mg/kg) on Nile tilapia (O. niloticus) undergone stress confinement. Two main effects of lycopene may be discerned.…”

Enhancement of Antioxidant Activity, Non-specific Immunity and Growth Performance of Nile Tilapia, Oreochromis Niloticus by Dietary Fructooligosaccharide

“…There was no significance difference in CAT activity with 2 and 3 % dietary FOS for 6 weeks compared to the control. This result could be explained that the exogenous antioxidants supplementation could reduce the gene expression of CAT enzyme and consequently decreases its activity [43]. Similar no significant effect on CAT activity has also been reported in blunt snout bream [12] and triangular bream Megalobrama terminalis [6].…”