Updated 29 November 2002, 17.53

			Fact File
	Jellyfish
		This species was first found in the Sea of Japan in 1920
		Abnormally warm weather could've caused the surge in numbers
		Dried and cured jellyfish are used in Chinese food

The species is called stomolophus nomurai. They're about a metre (three feet) wide and weigh up to 150kg (330 pounds).

They started popping up in the Sea of Japan in the middle of August.

Making fish sick

It's the biggest group of them to get to the area since 1958.

Its poison doesn't kill humans but it does affect other sea animals and plants.

Fishermen have complained the jellyfish have made fish and shrimp sick after they were stung by the jellyfish tentacles.

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	Peanut-sized jellyfish kills Briton