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Effects of various LED light spectra on circadian rhythm during starvation in the olive flounder (Paralichthys olivaceus)
- Choi, Cheol Young, Kim, Tae Hwan, Oh, Young-Hwan, Min, Tae-Sun, Choi, Ji Yong, Song, Jin Ah
- Biological rhythm research 2019 v.50 no.3 pp. 355-365
- Paralichthys olivaceus, acetyltransferases, aquaculture, circadian rhythm, cryptochromes, flounder, genes, light intensity, serotonin, starvation, wavelengths
- In aquaculture, feeding is essential for the maintenance of metabolic processes and homoeostasis of fish. However, fasting acts as a stressor. In this study, we investigated the effect of circadian rhythm under various LED wavelengths [blue (460 nm), green (520 nm) and red (630 nm)] and two light intensities (0.3 and 0.6 W m⁻²) over a 9-days period in the olive flounder (Paralichthys olivaceus). We analysed clock genes like period 2 (Per 2) and cryptochrome 1 (Cry 1), and serotonin and arylalkylamine-N-acetyltransferase 2 (AANAT 2), which control circadian rhythms. Per 2, Cry 1, serotonin and AANAT 2 were significantly decreased during the starvation period compared to the normal feeding group. Nevertheless, their levels increased in the groups exposed to green- and blue LED light during the experimental period. These results confirmed that green and blue wavelengths are effective in maintaining the circadian rhythm in olive flounder.