Light Spectrum Impacts on Growth, Molting, and Oxidative Stress Response of the Mud Crab Scylla paramamosain

An 8 weeks trial was performed to test the effects of light spectra [full-spectrum, violet (405 nm), blue (470 cyan (500 green (525 yellow (570 and red (625 nm)] on growth performance, molting, antioxidant capacity, stress response expression apoptosis-related genes in Scylla paramamosain . Results showed that spectrum had a significant effect S. physiology. Compared light, crabs exposed significantly lower survival rate (79.5 ± 3.6% vs. 94.9 3.6%), weight gain (49.2 5.4 67.6 6.7), molt frequency (4.2 0.2 4.5 0.1), extended intermolt intervals between instar 1 2 stages (C1–C2) (6.3 0.3 5.0 0.1 days). Expression molt-inhibiting hormone ( mih ) gene upregulated reared under light. According regression analysis, maximum SGR would be at 449.97 nm. Crabs also melatonin levels than full-spectrum cortisol groups. Regarding oxidative stress, H O MDA contents, however, no difference found total capacity (T-AOC), superoxide dismutase (SOD), catalase (CAT) hepatopancreas from different spectra. Gene hsp40 , hsp70 hsp90 were down-regulated group. genes, bcl-2 cox IV caspase 3 upregulated, suggesting may inhibit, while promote apoptosis. Taken together, these results suggest or could reduce