Aquaculture | 2021
Dietary taurine intake affects growth and taurine synthesis regulation in golden pompano, Trachinotus ovatus (Linnaeus 1758)
Abstract
Abstract Taurine serves an important role in many species, including fish. The purpose of this study was to investigate the effects of varying dietary taurine levels on the growth, antioxidant capacity, and tissue deposition of taurine in golden pompano. In addition, the mechanism of taurine synthesis was studied via enzyme activity and gene expression of the following enzymes: cystathionine β-synthase (CBS), cystathionine γ-lyase (CSE), cysteine dioxygenase (CDO), cysteine sulfinic acid decarboxylase (CSAD), and 2-aminoethanethiol dioxygenase (ADO). Taurine concentrations of 1.3, 4.4, 7.4, 10.5 and 12.7\xa0g\xa0kg−1 were added to the basic feed, hereafter labelled the T0, T1, T2, T3 and T4 diets, respectively. A control diet was supplemented with 1.3\xa0g\xa0kg−1 taurine. Following 8\xa0weeks of treatment, the results showed that the specific growth rate increased with the increase in dietary taurine content; the growth rate peaked at the 10.5\xa0g\xa0kg−1 dietary taurine level (P\xa0 \xa00.05). The gene expression of CBS, CSE, CDO, CSAD and ADO exhibited a downward trend with an increase of taurine (P