Investigation of the Light Intensity Effect on Growth, Molting, Hemolymph Lipid, and Antioxidant Capacity of Juvenile Swimming Crab Portunus trituberculatus

An eight-week experiment was conducted to evaluate the effects of eight light intensities (0, 0.83, 1.61, 8.17, 15.89, 31.38, 63.69, and 124.31 ?mol m -2 s -1 ) on survival, growth, antioxidant, molting-related apoptosis-related gene expression juvenile swimming crab Portunus trituberculatus . The results showed that survival rate crabs highest under 8.17 15.89 Under this intensity, had lowest hemolymph glucose (GLU) but triglyceride (TG) content. in these treatments also total antioxidant capacity (T-AOC), superoxide dismutase (SOD), catalase (CAT) activities, malondialdehyde (MDA) growth performance (including weight gain specific rate) molting frequency increased with increasing intensity. improved groups were accompanied by up-regulated retinoid-X receptor ( rxr ), ecdysone ecr nuclear E75 e75 expression, down-regulated molt-inhibiting hormone mih expression. In addition, suboptimal intensity significantly genes including c-Jun N-terminal kinase jnk tumor suppressor p53 B-cell lymphoma-2 bcl-2 ). Taken together, suitable for P. estimated be 9.96