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KMID : 0613820190290030311
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Journal of Life Science
2019 Volume.29 No. 3 p.311 ~ p.317
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Effects of Different Light Wavelengths on the Growth of Olive Flounder (Paralichthys olivaceus)
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Benedict Ndada Regina
Kim Yeo-Reum
Kim Jong-Myoung
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Abstract
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To investigate the effects of light on growth in fish, olive flounder (Paralichthys olivaceus) were reared under four kinds of monochromatic light-emitting diodes (LEDs) at violet (400 nm), blue (465 nm), green (508 nm), and red (635 nm) wavelengths, along with a white fluorescent lamp as control. The rearing experiments were carried out with 15 fish per tank under different wavelength illumination at the same intensity. After rearing the fish under a 12 hr:12 hr light:dark photoperiod for 60 days, percentage increases in weight gain of 269.92±13.02, 363.21±3.74, 433.22±4.83, 290.17±11.83, and 340.74±26.58% and increases in specific growth rates (SGR) of 2.18±0.06, 2.56±0.07, 2.79±0.01, 2.27± 0.05, and 2.47±0.10 were observed in fish grown under the illumination of red, blue, green, and violet LEDs and the white fluorescent light, respectively. The results show faster growth in fish reared under green LEDs, but slower growth in those reared under red light. Differences in most blood parameters were minor, aside from an increased level of glutamic oxaloacetic transaminase in the fish grown under red LED illumination. Histological analysis of the retina showed few changes in the ratio of photoreceptor layer thickness to total retina thickness in fish reared under the green LEDs compared to those in other illumination groups. These results indicate that green LED light can foster increased growth in olive flounder with no distinct harmful effects on their light-sensitive photoreceptor layers.
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KEYWORD
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Growth, LED (Light-Emitting Diode), olive flounder, photoreceptor, wavelength
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