SEOUL, Sept 1 (Reuters) - A majority of South Koreans are worried about Japan's discharge of treated radioactive water from the Fukushima nuclear plant into the sea despite efforts by their government to allay fears, a poll published on Friday showed.

President Yoon Suk Yeol has led a campaign to ease public concern and encourage consumption of seafood.

Despite such efforts, South Korean environmental groups and many members of the public are alarmed and Yoon's disapproval rating has risen to the highest in months, a Gallup Korea poll of 1,002 people showed.

"Half of those who identify as conservative and supportive of the government ... also expressed concern," Gallup Korea said.

Yoon's disapproval ratings rose to 59%, up two percentage points from a week ago, to a 16-week high.

Yoon has pledged 80 billion won ($60.6 million) this year to promote seafood consumption and has vowed to tackle what he called "fake news" about the release.

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