TOKYO, Aug 29 (Reuters) - Japan threatened on Tuesday to take China to the World Trade Organization (WTO) to seek a reversal of Beijing's ban on all of its seafood imports after the release of treated radioactive water from the stricken Fukushima Daiichi nuclear power plant.

Foreign Minister Yoshimasa Hayashi told reporters that Japan would take "necessary action (on China's aquatic product ban) under various routes including the WTO framework".

Filing a WTO complaint might become an option if protesting to China through diplomatic routes is ineffective, Economic Security Minister Sanae Takaichi said separately.

The comments came as Japanese businesses and public facilities continued to receive harassment calls from phone numbers with the +86 Chinese country code, with many reporting callers complaining of the Fukushima water release.

NTT East, which serves the eastern half of the country including Fukushima, said it had set up a customer service centre on Tuesday specifically for harassment calls from overseas, in response to the government's plea.

The minister said the government was gathering information on the reports of movements to boycott Japanese products in China and would work with business leaders to address the situation.

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