Effects of LEDs of different spectra on immunity-related responses in olive flounder Paralichthys olivaceus during short starvation

In this study, we investigated the regulation of innate immune responses in olive flounder Paralichthys olivaceus under irradiation with various light-emitting diodes (LEDs), blue (460nm), green (520nm), and red (630nm), at two intensities (0.3 and 0.6W/m(2)) for 9days. To evaluate the effects, we analyzed the levels of melatonin receptor 1 (MTR-1), melatonin, IgM, and lysozyme, which are related to the immunity index. The results showed that melatonin, IgM, and lysozyme significantly decreased during starvation compared to their levels in a normally fed control group. However, the decreases were less pronounced in the green and blue LED-exposed groups than those in the red LED-exposed group during the experimental period. These results confirmed that short-wavelength light (green and blue) is effective in maintaining enhanced immunity in olive flounder.