Effect of different levels of dietary αα-tocopherol on ovarian maturation and reproductive performance of broodstock litopenaeus vannamei (boone)
2006
DU, SHAOBO | HU, CHAOQUN | CAI, SHIQING | Shen, Qi | Zheng, Shixuan
Effects of 4 grade levels of dietary αα-tocopherol (37.82, 115.64, 349.42 and 522.56 mg kg⁻⁻¹ diet) on ovarian maturation and reproductive performance of broodstock shrimp, Litopenaeus vannamei were investigated. The αα-tocopherol concentrations in hepatopancreas, ovaries, eggs and muscle of female shrimp increased significantly as dietary αα-tocopherol levels increased. Survival, spermatophore weight, sperm count, gonadosomatic index (GSI), hepatosomatic index (HSI), fecundity and egg diameter were not significantly affected by dietary αα-tocopherol levels. Average daily spawns, hatching rate and fertilization rate significantly increased as dietary αα-tocopherol levels increased. Results of this study confirmed the importance of supplementation of αα-tocopherol to broodstock diets fed to L. vannamei, and suggested that at least 350 mg αα-tocopherol kg⁻⁻¹ of diet was needed to achieve significantly better ovarian maturation and reproductive performance.
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