Effects of Light Intensity on Growth Performance, Body Composition and Lysozyme Activity of Sub-adult Starry Flounder (Platichthys stellatus)

This study investigated the effect of light intensity on growth performance, body composition and lysozyme activity of sub-adult starry flounder (Platichthys stellatus) reared at five light intensities (2, 20, 100, 500 and 1,000 lx). Survival of sub-adult fish was 100% and there was no significant difference between 2, 20, 100, 500 and 1,000 lx. Growth performance of sub-adult reared at 2 lx was significantly higher than sub-adult reared at 1,000 lx, whereas there were no significant differences in growth performance of fish reared among at 20, 100 and 500 lx treatments. The crude protein content of sub-adult subjected to 1000 lx was significantly higher than that of fish subjected to 2 lx treatment, whereas there were no significant differences in the crude protein content of fish among 20, 100, and 500 lx treatments. The Ash content of sub-adult reared at 100 and 500 lx were significantly higher than that of fish reared at 2, 20 and 1000 lx treatments. Lysozyme activity of sub-adult was not significantly different among different light-intensity treatments. Considering these results, the 2 lx appears to be the optimal light intensity for the optimal growth of sub-adult starry flounder.