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Stomolophus nomurai

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description Stomolophus nomurai Overview

Stomolophus nomurai, commonly called Nomura's jellyfish, is a very large rhizostome jellyfish found in waters of East Asia, including the Yellow Sea, East China Sea, and Sea of Japan. Mature individuals can develop bells approaching or exceeding two meters in diameter and weigh well over 100 kilograms. Periodic blooms interfere with fishing by clogging and damaging nets, spoiling catches, and creating handling hazards because the animals possess stinging cells.

help Stomolophus nomurai FAQ

How large can Nomura's jellyfish become?

Large adults can develop bells approaching or exceeding 2 meters across and can weigh well over 100 kilograms. This makes Stomolophus nomurai one of the world's largest jellyfish.

Why do Nomura's jellyfish sometimes appear in enormous blooms?

Their abundance is influenced by currents, temperature, food supply, and conditions in East Asian coastal waters where young jellyfish develop. Scientists have also examined how fishing pressure, eutrophication, and environmental change may contribute to major bloom years.

Are Nomura's jellyfish dangerous to swimmers?

Their stings can be painful and medically significant, particularly because each animal is so large. Anyone stung in waters where the species occurs should leave the water and follow local medical guidance.

How do Nomura's jellyfish affect fishing in Japan?

Large blooms can clog and damage nets, spoil catches, and create dangerous loads when fishers try to haul the animals aboard. The species often reaches the Sea of Japan after developing farther west in waters linked to China and Korea.

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