Abstract
Abstract.— The objective of this study was to determine the effect of dietary vitamins A, D3, E, and C on the gonad development, lipid peroxidation, and immune response of yearling rice field eel, Monopterus albus. A 6‐wk feeding trial was designed according to an L16(45) orthogonal design, in which four vitamins, each at four supplementation levels, were arranged. Sixteen diets were mixed with the different vitamin levels and randomly assigned to 16 groups of fish. Increasing dietary vitamin E supplementation level significantly (P ≤ 0.05) increased the gonadosomatic index and lowered the serum content of malondialdehyde of rice field eel. Increasing dietary vitamin A and C levels also showed similar effect, but the differences were not statistically significant. Serum immunoglobulin M content increased significantly (P ≤ 0.01) as dietary vitamin C supplementation levels increased. The concentrations of calcium in bones showed significant (P ≤ 0.05) trend with vitamin D3 and A supplementation levels, but the bone phosphorus content was not affected by the dietary vitamin levels.
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