Vol. 62, 2023

(update: 2023.6.16)

Effects of Different LED Light Spectra on Growth and Immunity of the Japanese Eel (Anguilla japonica) and Giant Mottled Eel (A. marmorata)

^2,*

¹Institute of Fisheries Science, College of Life Science, National Taiwan University, Taipei 10617, Taiwan. *Correspondence: E-mail: yshan@ntu.edu.tw (Han). Tel: +886-233663726.
E-mail: b05502093@ntu.edu.tw (Lin)' willie7765818s@gmail.com (Hung)
²Everlight Electronics Co., LTD. No.6-8, Zhonghua Rd., Shulin Dist., New Taipei City 23860, Taiwan. E-mail: poaming@everlight.com (Yeh), dwcherng@everlight.com (Cherng)

^§YTL and WCH contributed equally to this work.
(Received 2 May 2022 / Accepted 28 April 2023 / Published 16 May 2023)
Communicated by Pung-Pung Hwang

Indoor recirculating aquaculture systems make light control possible and enable the usage of specific coloured lights to promote the growth and immunity of aquaculture species. Five different LED wavelengths (white light [460 nm], red light [622 nm], green light [517 nm], blue light [467 nm], and thedark) were used in this study to evaluate growth and immunity in the glass eel stage of two high-valued anguillid species, Japanese eel (Anguilla japonica) and giant mottled eel (A. marmorata). There were no significant differences in growth of the Japanese eel among the groups after 12 weeks of feeding (p > 0.05); the survival rate of each group was over 95%. The giant mottled eel showed better growth in total length and body weight in the red light and dark groups (p < 0.05). Expression levels of immune-related genes were not significantly different between each group of the Japanese eel and the giant mottled eel (p > 0.05). The growth of the Japanese glass eel was not significantly sensitive to different LED wavelengths, while the giant mottled glass eel showed better growth under red light and dark environments. Neither eel species showed significant differences in innate immunity under different LED wavelengths.

Key words: Anguilla eel, Growth, Immunity, LED, Light spectrum.

Citation: Lin YT, Hung WC, Yeh YF, Lu KM, Cherng DH, Han YS. 2023. Effects of different LED light spectra on growth and immunity of the Japanese eel (Anguilla japonica) and giant mottled eel (A. marmorata). Zool Stud 62:28. doi:10.6620/ZS.2023.62-28.