Author(s): Van-Manh Ngo and Minh-Hoang Le

Abstract: This study evaluated the effects of dietary vitamin E supplementation on the reproductive performance and the quality of eggs and larvae in snubnose pompano (Trachinotus blochii). Broodstock were fed diets supplemented with vitamin E at 0, 250, 500, 750, and 1,000 mg/kg for 30 days before induced spawning. Results showed that vitamin E significantly improved the maturation rates of both males and females, with the highest values observed in the 750 mg/kg group (90.47% for males and 89.66% for females) (P < 0.05). Fecundity increased with higher vitamin E levels, reaching 94,833 eggs/kg at 1,000 mg/kg. However, egg diameter and oil globule size were not significantly affected. Larval length was greatest in the 750 mg/kg group (2.62 mm), while yolk sac and larval oil globule diameters showed no significant variation among treatments. Vitamin E also enhanced fertilization and hatching rates, with the highest fertilization rate (~82%) recorded at 500 mg/kg and the highest hatching rate (~89%) at 750 mg/kg (P < 0.05). Although egg buoyancy tended to improve with vitamin E, the differences were not statistically significant. Furthermore, larval deformity rates decreased from ~9% (control) to 4-6% in supplemented groups, while 3-day-old larval survival rates increased significantly, with the best performance observed at 500 mg/kg (~56%). These findings confirm that vitamin E is a crucial nutrient for improving reproductive success and seed quality in T. blochii, with optimal supplementation levels ranging from 500 to 750 mg/kg.

DOI: 10.22271/fish.2025.v13.i3a.3073

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