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Effects of the seawater temperature and salinity on the survival and growth of the Sanderia malayensis (Cnidaris: Scyphozoa) ephyrae

K. Shin,Keun-Hyung Choi

Published 2025 in Marine Biology Research

ABSTRACT

ABSTRACT Sanderia malayensis, a tropical jellyfish in the order Semaeostomeae, is found in the Indian and Pacific Oceans, the Red Sea, the Suez Canal, and the coast of Pakistan. Recently, it has been observed in East Asian waters, particularly Japan, and may expand into South Korean waters due to marine environmental changes such as climate change and human activities. This study investigates the effects of temperature and salinity on the growth, feeding, and survival of S. malayensis ephyrae. The experimental design included temperatures of 15°C, 24°C, and 28°C, with salinities of 30 and 33 PSU. We specifically assessed the adaptive capacity of S. malayensis at 24°C, which reflects the summer seawater conditions along Korea's southern coast. The results showed that growth and feeding rates significantly increased at 24°C and 28°C, while lower rates were observed at 15°C. The highest survival rate (98%) was recorded at 24°C, with 77% at 15°C and 64% at 28°C. Changes in salinity did not significantly affect growth or survival. These findings suggest that temperature is a key factor in the stable development of S. malayensis ephyrae and may allow the species to expand into South Korean waters, affecting competition for resources and biodiversity.

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