ABSTRACT Effects of 4 grade levels of dietary [alpha]-tocopherol (37.82, 115.64, 349.42 and 522.56 mg [kg.sup.-1] diet) on ovarian maturation and reproductive performance of broodstock shrimp, Litopenaeus vannamei were investigated. The [alpha]-tocopherol concentrations in hepatopancreas, ovaries, eggs and muscle of female shrimp increased significantly as dietary [alpha]-tocopherol levels increased. Survival, spermatophore weight, sperm count, gonadosomatic index (GSI), ...