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Seo, J.O.; Park, H.S., and Kim, N.G., 2023. Effects of temperature, photo irradiance and photoperiods on the early growth of Sargassum thunbergii. In: Lee, J.L.; Lee, H.; Min, B.I.; Chang, J.-I.; Cho, G.T.; Yoon, J.-S., and Lee, J. (eds.), Multidisciplinary Approaches to Coastal and Marine Management. Journal of Coastal Research, Special Issue No. 116, pp. 563-567. Charlotte (North Carolina), ISSN 0749-0208. This study investigated the effects of temperature and light on the germination rate and growth of embryos obtained from mature Sargassum thunbergii, and early embryo development. The Sargassum thunbergii used in the experiment was collected in June 2022 from the Tongyeong coast, Gyeongnam, Korea. The released embryos were cultured at 10-25°C, a light intensity of 40 and 80 µmol m-2s-1, and a 14L:10D photoperiod (light: dark). The rhizome development and elongation of the germinated Sargassum thunbergii thallus occurred at weeks 1 to 3 of culture. Serrated secondary leaves formed in week 4 of culture, and fourth leaves formed in 5 weeks. At 6–10 weeks, many scale-like leaves developed. The germination rate of Sargassum thunbergii embryos was maximal at 25°C and 80 µmol m-2s-1 and lowest at 10°C and 40 µmol m-2s-1. The growth characteristics of the germinated thallus of this species differed more depending on the temperature, which makes Sargassum thunbergii a photophilic eurythermal seaweed that grows well under large temperature variation. [ABSTRACT FROM AUTHOR]