Effects of Dietary Taurine on Maturation Indices, Antioxidant Capacity, Ovaries Amino and Fatty Acids Profile, and Vitellogenin Gene Transcription Level in Penaeus vannamei Female Brooders.

A 30-day research was carried out to examine the impacts of dietary taurine (Tau) on ovaries maturation and physiological responses of Penaeus vannamei female brooders (29.4 ± 0.2 g). A basal diet (497 g kg ^-1 protein and 140 g kg ^-1 lipid) was administered with graded levels of Tau ranging from 0 (control) to 2, 4, 6, 8, and 10 g kg ^-1 . A total of 180 shrimp brooders were stocked into 18 250 L black circular polyethylene tanks. Female ( n  = 5) and male ( n  = 5) shrimps were stocked in each tank and supplied with seawater (35.2 ± 3.1 g L ^-1 salinity, 28.9 ± 1.4°C) and the experimental feeds were offered to shrimp twice a day at 5% of their biomass. Supplementing diet with 4-8 g Tau kg ^-1 reduced latency period after eye stalk ablation to spawning (5-6 days) that was associated with higher hepatopancreatic and gonadosomatic (except for 8 g Tau kg ^-1 diet) indices ( p < 0.05). With 10 g Tau kg ^-1 diet hepatopancreas glutathione peroxidase activity and total antioxidant capacity increased and catalase activity increased by 6 g Tau kg ^-1 diet. Supplementing diet with Tau-enhanced bile-salt dependent lipase activity in the gut. Docosahexaenoic acid and Tau levels were elevated in the ovaries with the increment of dietary Tau level ( p < 0.05). Plasma total protein, calcium, cholesterol, and high-density lipoprotein increased with inclusion of 6-10 g Tau kg ^-1 diet. The transcription levels of vitellogenin , insulin-like growth factor II , superoxide dismutase , prophenoloxidase , and lysozyme genes transcription levels were upregulated in the hepatopancreas of shrimp brooders fed 6-10 g Tau kg ^-1 diet ( p < 0.05). It seems that Tau at 4-8 g kg ^-1 diet by modulating lipid metabolism, antioxidant capacity, and immunocompetence can improve maturation and health status of P. vannamei brooders.
Competing Interests: The authors declare no conflicts of interest.
(Copyright © 2024 Mansour Torfi Mozanzadeh et al.)